CN101535922B - Electronic apparatus and cable device - Google Patents

Abstract

[PROBLEMS TO BE SOLVED] It is judged whether a connected cable is in conformity to a conventional specification or a new one. [MEANS FOR SOLVING THE PROBLEMS] An HPD signal line (902) has a pull-up resistor (911) connected with a voltage source in a circuit on a side of an expanding HDMI synch device (402) and a pull-down resistor (913) connected with the ground potential, and a reserve line (903) has a pull-down resistor (914) connected with the ground potential in a circuit on a side of the expanding HDMI synch (402) and a pull-up resistor (912) connected with a voltage source of an expanding HDMI source device (401) in a new HDMI cable (901). The expanding HDMI synch device compares a voltage at a test point (19) on the reserve line (903) on the side of the expanding HDMI synch device (402) with a reference voltage at a voltage comparator (916). A CPU of the expanding HDMI synch device (402) judges such a normal state that the new HDMI cable (901) is inserted in the case where an output from the voltage comparator (916) is high and also judges such a state that a conventional HDMI cable (931) is mistakenly inserted in the case where an output from the voltage comparator (916) is low.

Description

Electronic installation and cable machinery

Technical field

The present invention relates to the electronic installation of the communication interface with such as HDMI (high-definition media interface) and so on and be connected to the cable machinery of electronic installation.

Background technology

In recent years, just popular HDMI (R) as be used for such as from DVD (digital multi-purpose disk) register, Set Top Box and other AV (audio frequency and video) source to television set, projecting apparatus and other displays to send at a high speed the pixel data of digital television signal, i.e. unpressed (base band) image and to be affixed to the communication interface of voice data of this image.About HDMI patent disclosed in example comprise as follows.

Patent document 1: Japanese Patent Application Laid-Open No.2005-57714

Patent document 2: Japanese Patent Application Laid-Open No.2006-19948

Summary of the invention

The problem that the present invention solves

Mention along band, expect that HDMI standard will further expand in future.In this expansion, expect to keep the compatibility with existing HDMI standard by carrying out various improvement simultaneously.When carrying out this expansion, if user error ground inserts existing HDMI cable between the source device (source apparatus) of HDMI standard meeting expansion and sink device (sink apparatus), be difficult to detect it, which results in the inconvenience of the user inserting existing HDMI cable mistakenly.

Consider above-mentioned environment, the object of this invention is to provide a kind of can differentiation and be connected to the cable meeting existing standard and still meet the electronic installation of the cable of new standard and correspond to the cable machinery of this differentiation.

The means of dealing with problems

For solving the problem, according to main aspect of the present invention, electronic installation is provided, comprise: connector, the differential signal line that is incorporated with and is made up of the first holding wire and secondary signal line can be connected respectively and the first cable of resistor of providing at least secondary signal line and be incorporated with the first holding wire and secondary signal line the second cable as the holding wire separated; Comparison means, compares the voltage at secondary signal line place and preset reference voltage that detect via connector; And discriminating device, distinguish the first cable for result based on the comparison or the second cable is connected to connector.

At this, the first cable and the second cable are the telecommunication cables meeting such as HDMI standard.In addition, such as, the first holding wire is the HPD line in HDMI, and secondary signal line is the reserved line in HDMI.In the first cable, the first holding wire and secondary signal line are twisted-pair feeder by such as distribution, can carry out the communication by differential signal.

Use this structure, even if when being connected to the undesired cable of user, also easily can promoting to replace with the cable wanted, being connected to the first cable or the second cable because can distinguish.

This electronic equipment can also be included in the first holding wire and secondary signal line each on the capacitor that provides.

Therefore, the comparison of voltage can be carried out exactly, because cutting off the direct current on the first holding wire and secondary signal line.

In this electronic installation, described resistor can be first boosting (pull-up) resistor provided on secondary signal line, and described comparison means can be included in the second ballast resistor and the first step-down (pull-down) resistor that the first holding wire provides, the second dropping resistor that secondary signal line provides, and comparator, described comparator compares voltage at secondary signal line place and reference voltage.

Therefore, the difference between that detect respectively when the first cable is connected to connector and when the second cable is connected to connector, on secondary signal line voltage can become larger.Therefore, it is possible to accurately distinguish.

In this electronic installation, described resistor can be made up of the first dropping resistor provided on the first holding wire and the second dropping resistor provided on secondary signal line, and described comparison means can be included in the first ballast resistor that the first holding wire provides, the second ballast resistor that secondary signal line provides and comparator, described comparator compares voltage at secondary signal line place and reference voltage.

In addition, in this electronic installation, described resistor may be provided between the first holding wire and secondary signal line, and described comparison means can be included in the first ballast resistor and the first dropping resistor, the second ballast resistor that secondary signal line provides and the second dropping resistor, the open collector transistor npn npn that the first holding wire provides and comparator that the first holding wire provides, described comparator compares voltage at secondary signal line place and reference voltage.

By these structures, can work as when the first cable is connected to connector and design symmetric difference circuit, differential signal line can be used to send high-frequency signal and do not have phase distortion.

This electronic installation can also comprise output device, for exporting the result of differentiation.

At this, output device is such as display unit or audio output device.Therefore, it is possible to easily notify that user inserts the mistake of cable.

According to a further aspect in the invention, cable machinery is provided, comprise: cable main, which incorporates the differential signal line be made up of the first holding wire and secondary signal line and the resistor being connected at least secondary signal line, and the connector provided on the two ends of cable main, in order to connect the first electronic installation and second electronic device.

At this, resistor can provide at least one of the first holding wire and secondary signal line, or is provided to connect the first holding wire and secondary signal line.

The effect of invention

As mentioned above, by the present invention, the cable being connected to the cable meeting existing standard and still meeting new standard can be distinguished.

Embodiment

After this, embodiments of the invention will be described with reference to the drawings.

First, will describe communication system (image delivering system), it can carry out at a high speed two-way IP communication, keeps the compatibility with the such as communication interface of existing HDMI and so on simultaneously.

In recent years, just popular HDMI (R) is as being used for the communication interface such as sending the pixel data of digital television signal, i.e. unpressed (base band) image and the voice data with this image from DVD register, Set Top Box and other AV sources to television set, projecting apparatus and other displays with high speed.

For HDMI (R), HDMI regulation and stipulation from HDMI (R) information source to HDMI (R) stay of two nights with TMDS (minimum transition differential signal) channel of the unidirectional transmission pixel data of high speed and voice data, for carrying out the CEC line (consumer electronics's control line) etc. of two-way communication between HDMI (R) information source and HDMI (R) stay of two nights.

Fig. 1 is the figure of the structure that typical image transmission system is shown.

Such as, as shown in Figure 1, by connecting digital television 11 and AV amplifier 12 by HDMI (R) cable 13 meeting HDMI (R), come to send pixel data and voice data at a high speed.

In the living room being arranged in the user house on the left of Fig. 1, digital television 11, AV amplifier 12 and transcriber 14 are installed.Digital television 11 and AV amplifier 12 and AV amplifier 12 and transcriber 14 is connected with HDMI (R) cable 15 by HDMI (R) cable 13.

In addition, hub 16 is installed in living room, and by LAN (local area network (LAN)) cable 17 and LAN cable 1, digital television 11 and transcriber 14 is connected to hub 16.In addition, in the bedroom on the right side in living room in the drawings, digital television 19 is installed, and via LAN cable 20, digital television 19 is connected to hub 16.

Such as, in the content being reproduced in transcriber 14 record and when showing image on digital television 11, transcriber 14 decoded pixel data and voice data, for reproducing content, and supply the unpressed pixel data and voice data that obtain to digital television 11 via HDMI (R) cable 15, AV amplifier 12 and HDMI (R) cable 13.Based on the pixel data supplied from transcriber 14 and voice data, digital television 11 shows image and output sound.

In addition, when reproduction is recorded in the content in transcriber 14 and shows image on digital television 11 and digital television 19 simultaneously, transcriber 14 via LAN cable 18, hub 16 and LAN cable 17 to digital television 11, and via LAN cable 18, hub 16 and LAN cable 20 to digital television 19 supply compression pixel data and voice data with reproducing content.

In addition, digital television 11 and digital television 19 are decoded the pixel data and voice data supplied from transcriber 14, and based on obtained uncompressed pixel data and voice data output sound.

In addition, when digital television 11 receives pixel data and voice data for program in reproduced television broadcast, when received voice data be such as 5.1 sound channels around the voice data of voice data and digital television 11 can not be decoded received voice data time, voice data is converted to light signal by digital television 11, and sends light signal to AV amplifier 12.

AV amplifier 12 receives the light signal sent from digital television 11, this light signal of opto-electronic conversion, and the voice data that decoding so obtains.In addition, AV amplifier 12 amplifies decoded uncompressed voice data when needed, and is being connected to the circulating loudspeaker place producing sound of AV amplifier 12.In this way, digital television 11 is by the pixel data received of decoding, and by using the pixel data of decoding to show image, and by based on being supplied to the voice data of AV amplifier 12 at AV amplifier 12 output sound, reproduce 5.1 sound channels around program.

Fig. 2 is the figure of the structure of the image delivering system that the embodiment applied according to the present invention is shown.

Image delivering system is made up of digital television 31, amplifier 32, transcriber 33 and digital television 34.Respectively by HDMI (R) cable 35 meeting HDMI (R) and HDMI (R) cable 36 to be connected digital television 31 and amplifier 32 and amplifier 32 and transcriber 33.Digital television 31 and digital television 34 is connected by the LAN cable 37 of the such as LAN of Ethernet (registered trade mark) and so on.

In the example shown in Fig. 2, digital television 31, amplifier 32 and transcriber 33 are installed in the living room in the user house on the left of Fig. 2, and in the bedroom on the right side of living room, digital television 34 are installed.

Transcriber 33 is made up of such as DVD player, hdd recorder etc., its decoding is used for pixel data and the voice data of reproducing content, and supplies the unpressed pixel data and voice data that so obtain to amplifier 32 via HDMI (R) cable 36.

Such as, amplifier 32 is made up of AV amplifier, and from transcriber 33 to its supply pixel data and voice data, and amplify the voice data supplied when needed.In addition, amplifier 32 supplies the voice data amplified when needed and the pixel data supplied from transcriber 33 via HDMI (R) cable 35 to digital television 31.Based on the pixel data supplied from amplifier 32 and voice data, digital television 31 shows image and output sound carrys out reproducing content.

In addition, the two-way communication that digital television 31 and amplifier 32 can communicates and so on by using HDMI (R) cable 35 to carry out at a high speed such as IP, and amplifier 32 and transcriber 33 can also pass through HDMI (R) cable 36 high speed carries out the two-way communication that such as IP communicates and so on.

Namely, such as, transcriber 33 can send the pixel data and voice data that compress as the data that meet IP via HDMI (R) cable 36 to amplifier 32 by communicating with the IP of amplifier 32, and amplifier 32 can receive the unpressed pixel data and voice data that send from transcriber 33.

In addition, amplifier 32 can send the pixel data and voice data that have compressed as the data that meet IP via HDMI (R) cable 35 to digital television 31 by communicating with the IP of digital television 31, and digital television 31 can receive the pixel data compressed and voice data that send from amplifier 32.

Therefore, digital television 31 can send via LAN cable 37 pixel data and voice data that receive to digital television 34.In addition, digital television 31 is decoded the pixel data and voice data that receive, and based on obtained unpressed pixel data and voice data, display image output sound carrys out reproducing content.

Digital television 34 receives and the decode pixel data and voice data that send from digital television 31 via LAN cable 37, and based on the unpressed pixel data obtained by decoding and voice data, and display image output sound are with reproducing content.In this way, identical or different content can be reproduced at digital television 31 and digital television 34 place simultaneously.

In addition, when digital television 31 receives pixel data and voice data to reproduce the program as content in television broadcasting, if and the voice data received be the voice data of such as 5.1 sound channels around voice data and digital television 31 can not be decoded received voice data, digital television 31 sends to amplifier 32 voice data received via HDMI (R) cable 35 by communicating with the IP of amplifier 32.

Amplifier 32 receives and the voice data sent from digital television 31 of decoding, and amplifies the voice data of decoding when needed.Then, amplifier 32 reproduces 5.1 sound channels around sound from the loud speaker (not shown) being connected to amplifier 32.

Digital television 31 sends voice data via HDMI (R) cable 35 to amplifier 32, the pixel data received of decoding, and based on the pixel data obtained by decoding, display image is with playback of programs.

In this way, in the image delivering system shown in Fig. 2, the such as digital television 31 be connected with HDMI (R) cable 36 by HDMI (R) cable 35, amplifier 32 can communicate by using HDMI (R) cable to carry out IP at a high speed with the electronic installation of transcriber 33 and so on, and therefore, do not need to use the LAN cable corresponding to the LAN cable 17 shown in Fig. 1.

In addition, connect digital television 31 and digital television 31 by LAN cable 37, and digital television 31 can send via LAN cable 37 data received from transcriber 33 via HDMI (R) cable 36, amplifier 32 and HDMI (R) cable 35 to digital television 34.Therefore, the electronic installation using LAN cable and correspond to the LAN cable 18 shown in Fig. 1 and hub 16 is not needed.

In the conventional images transmission system shown in Fig. 1, depend on that sending/receiving data and communication means need dissimilar cable, make the distribution of the cable of interconnecting electronics be complicated.On the contrary, in the image delivering system shown in Fig. 2, the electronic installation connected by HDMI (R) cable can carry out the high-speed bidirectional communication of such as IP communication and so on, makes it possible to the connection be reduced between electronic installation.That is, the existing distribution of the complexity of the cable of connection of electronic devices can be simplified.

Next, Fig. 3 structure of HDMI (R) stay of two nights of HDMI (R) information source set up in the electronic installation connected by HDMI (R) cable respectively and HDMI (R) stay of two nights, HDMI (R) information source such as provided in the amplifier 32 shown in Fig. 2 being provided and providing in digital television 31.

HDMI (R) information source 71 and HDMI (R) stay of two nights 72 is connected by HDMI (R) cable 35, and HDMI (R) information source 71 can communicate by using HDMI (R) cable 35 to carry out two-way IP at a high speed with HDMI (R) stay of two nights 72, keeps the compatibility with current HDMI (R) simultaneously.

The effective video cycle of horizontal blanking period and vertical blanking period is being deducted (after this as from a vertical synchronizing signal to the cycle of next vertical synchronizing signal, at random be called active (active) video cycle) in, HDMI (R) information source 71 sends the differential signal corresponding with the pixel data of the uncompressed image of a screen via multiple channel to HDMI (R) stay of two nights 72 uniaxially.In horizontal blanking period or vertical blanking period, HDMI (R) information source sends the differential signal corresponding with at least voice data of adjoint image, other auxiliary datas etc. and control data via multiple channel to HDMI (R) stay of two nights 72 uniaxially.

That is, HDMI (R) information source 71 has reflector 81.The pixel data of such as uncompressed image is converted to corresponding differential signal by reflector 81, and unidirectional and send differential signal continuously to HDMI (R) stay of two nights 72 via three TMDS channels #0, #1 and #2 of HDMI (R) cable 35.

In addition, voice data with uncompressed image, necessary control data, other auxiliary datas etc. is converted to corresponding differential signal by reflector 81, and by use three TMDS channels #0, #1 and #2 to the unidirectional and switched differential signal of transmission continuously of HDMI (R) stay of two nights 72 is connected via HDMI (R) circuit 35.

In addition, reflector 81 sends the pixel clock synchronous with the pixel data that will send via three TMDS channels #0, #1 and #2 via TMDS clock channel to HDMI (R) stay of two nights 72 being connected to HDMI (R) circuit 35.During a pixel clock, send the pixel data of 10 bits via a TMDS channel #i (i=0,1 and 2).

HDMI (R) stay of two nights 72 send during the active video cycle with via multiple channel from the corresponding differential signal of the pixel data of the unidirectional transmission of HDMI (R) information source 71, and to receive during horizontal blanking period or vertical blanking period via with voice data and the control data corresponding differential signal of multiple channel from the unidirectional transmission of HDMI (R) information source 71.

That is, HDMI (R) stay of two nights 72 has receiver 82.Receiver 82 is via TMDS clock channel, with the pixel clock also sent from HDMI (R) information source 71 synchronously, receive via TMDS channel #0, #1 and #2 from be connected to HDMI (R) cable 35 the unidirectional transmission of HDMI (R) information source 71 the differential signal corresponding to pixel data and correspond to the differential signal of voice data and control data.

The transmission channel of HDMI (R) system be made up of HDMI (R) information source 71 and HDMI (R) stay of two nights 72 comprises: except as synchronously unidirectional and sends continuously three TMDS channel #0 to #2 of the transmission channel of pixel data and voice data to HDMI (R) stay of two nights 72 from HDMI (R) information source 71 with pixel clock, and as beyond the TMDS clock channel of the transmission channel for sending pixel clock, DDC (display data channel) 83 and be called as the transmission channel of CEC line 84.

DDC 83 is made up of two the holding wire (not shown) comprised in HDMI (R) cable 35, and reads E-EDID (strengthen extending display identification data) via HDMI (R) cable 35 from HDMI (R) stay of two nights 72 being connected to HDMI (R) information source 71 for HDMI (R) information source 71.

Namely, except receiver 82, HDMI (R) stay of two nights 72 has and stores the EDIDROM (EDID ROM (read-only memory)) 85 of representative about the E-EDID of the setting of HDMI (R) stay of two nights 72 itself and the information of performance.HDMI (R) information source 71 reads from HDMI (R) stay of two nights 72 being connected to HDMI (R) information source 71 via HDMI (R) cable 35 E-EDID be stored in the EDIDROM 85 of HDMI (R) stay of two nights 72 via DDC 83, and based on E-EDID, identify setting and the performance of HDMI (R) stay of two nights 72, namely, such as, the picture format (profile (profile)) that can be processed by HDMI (R) stay of two nights 72 (electronic installation of process HDMI (R) stay of two nights 72), such as RGB is (red, green, blue), YCbCr 4:4:4 and YCbCr 4:2:2.

Although not shown, be similar to HDMI (R) stay of two nights 72, HDMI (R) information source 71 and can also store E-EDID and send E-EDID to HDMI (R) stay of two nights 72 when needed.

CEC line 84 is made up of the holding wire (not shown) comprised in HDMI (R) cable 35, and for the two-way communication of the control data between HDMI (R) information source 71 and HDMI (R) stay of two nights 72.

In addition, HDMI (R) information source 71 and HDMI (R) stay of two nights 72 by sending respectively to HDMI (R) stay of two nights 72 and HDMI (R) information source 71 frame meeting IEEE (IEEE) 802.3 via DDC 83 or CEC line 84, can carry out two-way IP communication.

HDMI (R) cable 35 also comprises the holding wire 86 being connected to the plug that so-called hot plug detects.By the connection using this holding wire 86, HDMI (R) information source 71 and HDMI (R) stay of two nights 72 can detect new electronic installation, i.e. HDMI (R) stay of two nights 72 or HDMI (R) information source 71 respectively.

Next, Fig. 4 and Fig. 5 shows the pin assignments of the connector (not shown) of equipment in HDMI (R) information source 71 that will be connected to HDMI (R) cable 35 or HDMI (R) stay of two nights 72.

Should note, in figures 4 and 5, in left column (PIN row), write is for identifying the number of pins of each pin of connector, and is assigned to the title of the signal of each pin writing in by the left column of going together mutually the number of pins mark write in right row (signal allocated column).

Fig. 4 illustrates the distribution of the pin of the connector of the type-A being called as HDMI (R).

Two holding wires as the differential signal line of the differential signal TMDS Data#i+ and TMDS Data#i-for sending TMDS channel #i are connected to the pin (number of pins 1,4 and 7) being assigned to TMDS Data#i+ and the pin (number of pins 3,6 and 9) being assigned to TMDS Data#i-.

In addition, the CEC line 84 for the CEC signal sending control data is connected to the pin with number of pins 13, and the pin with number of pins 14 is reserved pin.If two-way IP communication can be carried out by using this reserved pin, then can keep the compatibility with current HDMI (R).In order to send differential signal by use CEC line 84 with the holding wire that will be connected to the pin with number of pins 14, the holding wire and the CEC line 84 that are connected to the pin with number of pins 14 are differential twisted pair (twist pair) by distribution, and conductively-closed and be grounding to and be connected to the CEC line 84 of the pin with number of pins 17 and the ground wire of DDC 83.

In addition, holding wire for the DSA (sequence data) sending such as E-EDID and so on is connected to the pin with number of pins 16, and is connected to the pin with number of pins 15 for the clock signal sent as synchronous SCL (sequential clock) signal of the sending/receiving that will be used to SDA signal.DDC 83 shown in Fig. 3 is made up of the holding wire for sending SDA signal and the holding wire for sending SCL signal.

In addition, be similar to CEC line 84 and the holding wire that will be connected to the pin with number of pins 14, for sending the holding wire of SDA signal and the holding wire for sending SCL signal is differential twisted pair by distribution, and conductively-closed and be grounding to the ground wire that will be connected to the pin with number of pins 17, to send differential signal.

In addition, the holding wire 86 for the signal sending the connection for detecting new electronic installation is connected to the pin with number of pins 19.

Fig. 5 shows the distribution of the pin being called as the type-C of HDMI (R) and the connector of mini type.

Two holding wires as the differential signal line of the differential signal TMDS Data#i+ and TMDS Data#i-for sending TMDS channel #i are connected to the pin (number of pins 2,5 and 8) being assigned to TMDS Data#i+ and the pin (number of pins 3,6 and 9) being assigned to TMDS Data#i-.

In addition, be connected to the pin with number of pins 14 for the CEC line 84 sending CEC signal, and the pin with number of pins 17 is reserved pin.Be similar to type-A, holding wire and the CEC line 84 that be connected to the pin with number of pins 17 are differential twisted pair by distribution, and conductively-closed and be grounding to and will be connected to the CEC line 84 of the pin with number of pins 13 and the ground wire of DDC 83.

In addition, the holding wire for sending SDA signal is connected to the pin with number of pins 16, and the holding wire for sending SCL signal is connected to the pin with number of pins 15.Be similar to type-A, for sending the holding wire of SDA signal and the holding wire for sending SCL signal is differential twisted pair by distribution, and conductively-closed and be grounding to the ground wire that will be connected to the pin with number of pins 13, to send differential signal.Holding wire 86 for the signal sending the connection for detecting new electronic installation is connected to the pin with number of pins 19.

Next, Fig. 6 illustrates the figure for the structure by use CEC line 84 and the half-duplex operation of holding wire of the reserved pin being connected to HDMI (R) connector to carry out HDMI (R) information source 71 that IP communicates and HDMI (R) pixel 72.Notice, Fig. 6 illustrates the example of the structure of the part of the half-duplex operation about HDMI (R) information source 71 and HDMI (R) stay of two nights 72.In figure 6, carry out those the corresponding parts shown in representative graph 3 by identical symbol, and suitably the descriptions thereof are omitted.

HDMI (R) information source 71 is made up of reflector 81, switch control unit 121 and timing control unit 122.In addition, also converting unit 131, decoding unit 132 and switch 133 is provided to reflector 81.

What be supplied to converting unit 131 is the Tx data sent from HDMI (R) information source 71 to HDMI (R) pixel 72 that will be communicated by the two-way IP between HDMI (R) information source 71 and HDMI (R) pixel 72.Such as, Tx data are pixel data and voice datas etc. of compression.

Converting unit 131 is made up of such as differential amplifier, and supplied Tx data are converted to the differential signal with two part signals.In addition, converting unit 131 sends via CEC line 84 and the holding wire 141 of the reserved pin being connected to the connector (not shown) provided in transceiver 81 differential signal obtained by changing to receiver 82.Namely, converting unit 131 is via CEC line 84, more specifically via providing in reflector 81 and being connected to the holding wire of the CEC line 84 of HDMI (R) cable 35, supply the part signal of differential signal forming and obtain by changing to switch 133, also via holding wire 141, more specifically via providing in reflector 81 and being connected to the holding wire of the holding wire 141 of HDMI (R) cable 35 and supplying another part signal forming differential signal via holding wire 141 to receiver 82.

The differential amplifier that decoding unit 132 is connected to CEC line 84 and holding wire 141 by such as its input is formed.Under the control of timing control unit 122, decoding unit 132 receives the differential signal sent from receiver 82 via CEC line 84 and holding wire 141, namely the differential signal be made up of the part signal on CEC line 84 and the part signal on holding wire 141, and this differential signal of decoding is to export original Rx data.At this, Rx data refer to the data sent from HDMI (R) stay of two nights 72 to HDMI (R) information source 71 by the two-way IP communication between HDMI (R) information source 71 and HDMI (R) stay of two nights 72, and comprise the order of the transmission for asking pixel data and voice data etc.

When sending data, supply from the CEC signal of HDMI (R) information source 71 or from the part signal of converting unit 131 formation corresponding to the differential signal of Tx data to switch 133, and when receiving data, supply to switch 133 part signal that the CEC signal from receiver 82 or the formation from receiver 82 correspond to the differential signal of Rx data.Under the control of switch control unit 121, switch 133 optionally exports the CEC signal from HDMI (R) information source 71, the CEC signal from receiver 82, forms the part signal of the differential signal corresponding to Tx data or form the part signal of the differential signal corresponding to Rx data.

Namely, when HDMI (R) information source 71 sends data to HDMI (R) stay of two nights 72, switch 133 is selected from the CEC signal of HDMI (R) information source 71 supply or the part signal from converting unit 131 supply, and sends selected CEC signal or part signal via CEC line 84 to receiver 82.

In addition, when HDMI (R) information source 71 receives the data sent from HDMI (R) stay of two nights 72, switch 133 receives the part signal of the CEC signal sent from receiver 82 via CEC line 84 or the differential signal corresponding to Rx data, and supplies the CEC signal or part signal that receive to HDMI (R) information source 71 or decoding unit 132.

Switch control unit 121 control switch 133 makes switch select to be supplied to one of signal of switch 133 to switch (change over) switch 133.Timing control unit 122 controls the reception timing of the differential signal at decoding unit 132 place.

In addition, HDMI (R) stay of two nights 72 is made up of receiver 82, timing control unit 123 and switch control unit 124.In addition, receiver 82 has converting unit 134, switch 135 and decoding unit 136.

Converting unit 134 is made up of such as differential amplifier, and to its supply Rx data.Under the control of timing control unit 123, supplied Rx data are converted to the differential signal with two part signals by converting unit 134, and send via CEC line 84 and holding wire 141 signal obtained by changing to reflector 81.Namely, converting unit 134 via CEC line 84, more specifically via to provide in receiver 82 and the holding wire being connected to the CEC line 84 of HDMI (R) cable 35 supplies the part signal forming the differential signal obtained by changing to switch 135, and also via holding wire 141, more specifically via to provide in reflector 81 and the holding wire being connected to the holding wire 141 of HDMI (R) cable 35 supplies another part signal forming differential signal to reflector 81.

Timing when receiving data, the part signal that the CEC signal from reflector 81 or the formation from reflector 81 correspond to the differential signal of Tx data is supplied to switch 135, and the timing when sending data, the formation of supplying from converting unit 134 to switch 135 corresponds to the part signal of differential signal of Rx data or the CEC signal from HDMI (R) stay of two nights 72.Under the control of switch control unit 124, switch 135 optionally exports the CEC signal from reflector 81, the CEC signal from HDMI (R) stay of two nights 72, forms the part signal of the differential signal corresponding to Tx data or form the part signal of the differential signal corresponding to Rx data.

Namely, timing when HDMI (R) stay of two nights 72 sends from data to HDMI (R) information source 71, switch 135 is selected from the CEC signal of HDMI (R) stay of two nights 72 supply or the part signal from converting unit 134 supply, and sends selected CEC signal or part signal via CEC line 84 to reflector 81.

In addition, timing when HDMI (R) stay of two nights 72 receives the data sent from HDMI (R) information source 71, switch 135 receives the part signal of the CEC signal sent from reflector 81 via CEC line 84 or the differential signal corresponding to Tx data, and supplies the CEC signal or part signal that receive to HDMI (R) stay of two nights 72 or decoding unit 136.

The differential amplifier that decoding unit 136 is connected to CEC line 84 and holding wire 141 by such as its input is formed.Decoding unit 136 receives the differential signal sent from reflector 81 via CEC line 84 and holding wire 141, namely the differential signal be made up of the part signal on CEC line 84 and the part signal on holding wire 141, and this differential signal of decoding is to export original Tx data.

Switch control unit 124 control switch 135 makes switch 135 select to be supplied to one of signal of switch 135 with diverter switch 135.Timing control unit 123 controls the transmit timing of the differential signal at converting unit 134 place.

In addition, when HDMI (R) information source 71 and HDMI (R) stay of two nights 72 use CEC line 84 be connected to reserved pin holding wire 141 and use the holding wire for sending SDA signal and the holding wire for sending SCL signal by full-duplex communication carry out IP communicate, as HDMI (R) information source 71 that such as constructs as shown in Figure 7 and HDMI (R) stay of two nights 72.Notice that by the element corresponding to those shown in same-sign representative graph 6, and suitably the descriptions thereof are omitted in the figure 7.

HDMI (R) information source 71 is made up of reflector 81, switch control unit 121 and switch control unit 171.In addition, reflector 81 has converting unit 131, switch 133, switch 181, switch 182 and decoding unit 183.

Timing when sending data, the SDA signal from HDMI (R) information source 71 is supplied to switch 181, and the timing when receiving data, to the SDA signal of switch supply from receiver 82, or correspond to the part signal of the differential signal of Rx data from the formation of receiver 82.Under the control of switch control unit 171, switch 181 optionally exports the SDA signal from HDMI (R) information source 71, the SDA signal from receiver 82, or forms the part signal of the differential signal corresponding to Rx data.

Namely, timing when receiving the data sent from HDMI (R) stay of two nights 72 when HDMI (R) information source 71, switch 181 receives the SDA signal sent from receiver 82 via SDA line 191, and the SDA signal or part signal that receive is supplied to HDMI (R) information source 71 or decoding unit 183, this SDA line 191 is the holding wires for sending SDA signal or the part signal corresponding to the differential signal of Rx data.

In addition, timing when HDMI (R) information source 71 sends from data to HDMI (R) stay of two nights 72, switch 181 sends the SDA signal supplied from HDMI (R) information source 71 to receiver 82 via SDA line 191, or do not send signal to receiver 82.

Timing when sending out data, supplies the SCL signal from HDMI (R) information source 71 to switch 182, and timing when data is received, corresponds to the part signal of the differential signal of Rx data to switch 182 formation of supplying from receiver 82.Under the control of switch control unit 171, switch 182 optionally exports SCL signal or forms the part signal of the differential signal corresponding to Rx data.

Namely, timing when HDMI (R) information source 71 receives the data sent from HDMI (R) stay of two nights 72, switch 182 receives the part signal corresponding to the differential signal of Rx data sent from receiver 82 via scl line 192, and the part signal received is supplied to decoding unit 183, or not Received signal strength, wherein this scl line 192 is the holding wires for sending SCL signal.

In addition, timing when HDMI (R) information source 71 sends from data to HDMI (R) pixel 72, switch 182 sends the SCL signal supplied from HDMI (R) information source 71 to receiver 82 via scl line 192, or do not send signal to receiver.

The differential amplifier that decoding unit 183 is connected to SDA line 191 and scl line 192 by such as its input is formed.Decoding unit 183 receives the differential signal sent from receiver 82 via SDA line 191 and scl line 192, namely the differential signal that the part signal on SDA line 191 and the part signal on scl line 192 are formed, and this differential signal of decoding is to export original Rx data.

Switch control unit 171 control switch 181 and switch 182 carry out diverter switch 181 and switch 182 is selected to be supplied to some in the signal of switch to make switch 181 and switch 182.

In addition, HDMI (R) stay of two nights 72 is made up of receiver 82, switch control unit 124 and switch control unit 172.In addition, receiver 82 has switch 135, decoding unit 136, converting unit 184, switch 185 and switch 186.

Converting unit 184 is made up of such as differential amplifier, and to its supply Rx data.Supplied Rx data transaction is the differential signal be made up of two part signals by converting unit 184, and sends via SDA line 191 and scl line 192 differential signal obtained by changing to reflector 81.That is, converting unit 184 sends the part signal forming the differential signal obtained by changing to reflector 81 via switch 185, and also supplies another part signal forming this differential signal to reflector 81 via switch 186.

Timing when sending data, the formation of supplying from converting unit 184 to this switch 185 corresponds to the part signal of differential signal of Rx data or the SDA signal from HDMI (R) stay of two nights 72, and the timing when receiving data, to the SDA signal of switch supply from reflector 81.Under the control of switch control unit 172, switch 185 optionally exports the SDA signal from HDMI (R) stay of two nights 72, the SDA signal from reflector 81 or forms the part signal of the differential signal corresponding to Rx data.

Namely, timing when HDMI (R) stay of two nights 72 receives the data sent from HDMI (R) information source 71, switch 185 receives the SDA signal sent from reflector 81 via SDA line 191, and supply the SDA signal received to HDMI (R) stay of two nights 72, or not Received signal strength.

In addition, timing when HDMI (R) stay of two nights 72 sends from data to HDMI (R) information source 71, switch 185 sends from the SDA signal of HDMI (R) stay of two nights 72 supply or the part signal from converting unit 184 supply to reflector 81 via SDA line 191.

Timing when sending data, corresponds to the part signal of differential signal of Rx data to switch 186 formation of supplying from converting unit 184, and the timing when receiving data, supply the SCL signal from reflector 81 to switch 186.Under the control of switch control unit 172, switch 186 optionally exports the part signal or SCL signal that form the differential signal corresponding to Rx data.

Namely, timing when HDMI (R) stay of two nights 72 receives the data sent from HDMI (R) information source 71, switch 186 receives the SCL signal sent from reflector 81 via scl line 192, and supply the SCL signal received to HDMI (R) stay of two nights 72, or not Received signal strength.

In addition, the timing when HDMI (R) stay of two nights 72 sends data to HDMI (R) information source 71, switch 186 sends the part signal supplied from converting unit 184 to reflector 81 via scl line 192, or do not send signal.

Switch control unit 172 control switch 185 and switch 186, with diverter switch 185 and switch 186, make switch 185 and switch 186 select to be supplied to some in the signal of switch.

Mention along band, when HDMI (R) information source 71 and HDMI (R) stay of two nights 72 carry out IP communicate time, the structure of each that HDMI (R) information source 71 and HDMI (R) stay of two nights 72 are depended in half-duplex operation or full-duplex communication can be carried out.Therefore, by reference to the E-EDID received from HDMI (R) stay of two nights 72, HDMI (R) information source 71 judges to carry out half-duplex operation, full-duplex communication or two-way communication by sending of CEC signal.

The E-EDID received by HDMI (R) information source 71 is made up of all basic blocks as shown in Figure 8 and extension blocks.

By the E-EDID1.3 specification stated by " E-EDID1.3 basic structure " the data that define be arranged on the initial of the basic block of E-EDID, subsequently by " preferably timing " state, for keeping the timing information with the compatibility of existing EDID, and stated by " the second timing ", for keeping the timing information being different from " preferably timing " with the compatibility of existing EDID.

After " second timing ", sequentially arrange in basic block be the representative display device name stated by " Monitor Name " information and stated by " restriction of monitor scope ", the information of pixel quantity that representative can show with the ratio of width to height of 4: 3.

On the other hand, initial in extension blocks, be provided with the information about right/left loud speaker representated by " loud speaker distribution ", sequentially quote by this order subsequently: stated by " video profile (short) ", about describe can be shown picture size, frame rate, interlacing (interlace) or line by line the information of (progressive) data and the data of the ratio of width to height are described; Data that stated by " audio profile ", that describe the information about audio encoding and decoding method, sample frequency, stop-band, coding/decoding bit number etc. that can be reproduced; And to be stated by " loud speaker distribution ", about the information of right/left loud speaker.

After " loud speaker distribution ", sequentially arrange in extension blocks stated by " vendor specific ", the data of the client of each producer definition, stated by " the 3rd timing ", for keeping the timing information with the compatibility of existing EDID, and stated by " the 4th timing ", for keeping the timing information with the compatibility of existing EDID.

The data stated by " vendor specific " have the data structure shown in Fig. 9.That is, each 0 to the N block with a byte is provided to the data stated by " vendor specific ".

By " vendor specific " state be arranged in the 0th piece of data section start arrange by " vendor specific label code (=3) " state, represent the header of the data field of the data that designation data " vendor specific " is stated information and stated by " length (=N) ", the information of the length of representative data " vendor specific ".

In the first to the three piece arrange be about be registered for HDMI (R) number " 0 × 000C03 " and the information stated by " 24 Bit IEEE Registration identification code (0 × 000C03) LSB first ".What arrange in the 4th and the 5th piece is the information of the physical address representing the 24 bit sink device represented by " A ", " B ", " C " and " D " respectively.

Arrange in the 6th piece: mark that stated by " support-AI ", that indicate the function supported by each sink device; Respectively by " DC-48 bit ", " DC-36 bit " and " DC-30 bit " states, the information of the bit number that is used to specify each pixel; Stated by " DC-Y444 ", indicate each sink device whether can send the mark of the image of YCbCr4:4:4; And to be stated by " DVI-two ", indicate each sink device whether can mate the mark of two DVI (digital visual interface).

The information being stated, represented the highest frequency of the pixel clock of TMDS by " maximum-TMDS clock " arranged in the 7th piece.The deferred message of being stated by " full duplex ", indicating the video and audio signal of being stated by " reaction time, the whether possible full duplex of instruction full-duplex communication mark " arranged in the 8th piece in the presence/absence of mark, and stated by " half-duplex ", half-duplex mark that whether instruction half-duplex operation possible.

Such as, the full duplex mark arranged (such as, being set to " 1 ") instruction HDMI (R) stay of two nights 72 has function, i.e. HDMI (R) stay of two nights 72 carrying out full-duplex communication and has the structure shown in Fig. 7, and full duplex mark (such as, being set to " 0 ") instruction HDMI (R) stay of two nights 72 resetted does not have the function of carrying out full-duplex communication.

Similarly, the half-duplex mark arranged (such as, being set to " 1 ") instruction HDMI (R) stay of two nights 72 has the function, namely of carrying out half-duplex operation, HDMI (R) stay of two nights 72 has the structure shown in Fig. 6, and half-duplex mark (such as, being set to " 0 ") instruction HDMI (R) stay of two nights 72 resetted does not have the function of carrying out half-duplex operation.

In the 9th piece of the data stated by " vendor specific ", be provided with the delay time data of the progressive image of being stated by " video reaction time ", and in the tenth piece, be provided with the delay time data of the sound with progressive image of being stated by " audio response time ".In addition, in the 11 piece, the delay time data of the interlayer image (interlayer image) of being stated by " interlaced video reaction time " is set, and in the 12 piece, settled the delay time data of the sound with interlaced picture of being stated by " interlacing audio response time ".

Based on the full duplex mark comprised in the E-EDID received from HDMI (R) stay of two nights 72 and half-duplex mark, HDMI (R) information source 71 judges to carry out half-duplex operation, full-duplex communication or two-way communication by the transmission of CEC signal, and carries out the two-way communication with HDMI (R) stay of two nights 72 according to judged result.

Such as, if HDMI (R) information source 71 has the structure shown in Fig. 6, HDMI (R) information source 71 can carry out half-duplex operation with HDMI (R) stay of two nights 72 shown in Fig. 6, but can not carry out half-duplex operation with HDMI (R) stay of two nights 72 shown in Fig. 7.

Therefore, when connecting the power supply of electronic installation of equipment HDMI (R) information source 71, HDMI (R) information source 71 starts communication process to carry out the two-way communication corresponding with the function handled by HDMI (R) stay of two nights 72 being connected to HDMI (R) information source 71.

After this, with reference to the flow chart shown in Figure 10, will the communication process that performs of HDMI (R) information source 71 as shown in Figure 6 by describing.

Judge whether new electronic installation is connected to HDMI (R) information source 71 in step S11, HDMI (R) information source 71.Such as, HDMI (R) information source 71 is called as " hot plug detection " and is connected to the amplitude of the voltage of the pin of holding wire 86 according to being applied to, judge whether to be connected to the new electronic installation being equipped with HDMI (R) stay of two nights 72.

If judge not connect new electronic installation in step S11, then do not carry out communication and after this stop communication process.

On the other hand, if judge to be connected to new electronic installation in step S11, then in step s 12, switch control unit 121 control switch 133 carrys out diverter switch 133 to select the CEC signal from HDMI (R) information source 71 when sending out data and to select the CEC signal from receiver 82 when data is received.

Receive the E-EDID sent from HDMI (R) stay of two nights 72 via DDC 83 in step S13, HDMI (R) information source 71.That is, when the connection of HDMI (R) information source 71 being detected, HDMI (R) stay of two nights 72 reads E-EDID from EDIDROM 85, and sends the E-EDID read to HDMI (R) information source 71 via DDC 83.HDMI (R) information source 71 receives the E-EDID sent from HDMI (R) stay of two nights 72.

Judge whether to carry out the half-duplex operation with HDMI (R) stay of two nights 72 in step S14, HDMI (R) information source 71.That is, HDMI (R) information source 71 is with reference to the E-EDID received from HDMI (R) stay of two nights 72, and judges whether that being provided with the half-duplex shown in Fig. 9 marks " half-duplex ".Such as, if be provided with half-duplex mark, HDMI (R) information source 71 judges to carry out two-way IP communication by half-duplex operation method, i.e. half-duplex operation.

If judge to carry out half-duplex operation in step S14, then in step S15, HDMI (R) information source 71 sends the signal of the channel information of the channel that representatively will be used to two-way communication to receiver 82 via switch 133 and CEC line 84, make to use CEC line 84 to communicate with the IP that holding wire 141 carries out being undertaken by half-duplex operation method.

That is, if be provided with half-duplex mark, HDMI (R) information source 71 can be known, HDMI (R) stay of two nights 72 has the structure shown in Fig. 6, and CEC line 84 and holding wire 141 can be used to carry out half-duplex operation.HDMI (R) information source 71, to HDMI (R) stay of two nights 72 transmitting channel information, notifies to make to carry out half-duplex operation.

In step S16, switch control unit 121 control switch 133 carrys out diverter switch 133 to select the differential signal corresponding to Tx data from converting unit 131 when sending out data, and selects the differential signal corresponding to Rx data from receiver 82 when data is received.

Undertaken communicating with the two-way IP of HDMI (R) stay of two nights 72 by half-duplex operation method in each assembly of step S17, HDMI (R) information source 71, then stop communication process.Namely, when sending out data, the Tx data of supplying from HDMI (R) information source 71 are converted to differential signal by converting unit 131, and supply the part signal forming the differential signal obtained by changing to switch 133, and supply another part signal via holding wire 141 to receiver 82.Switch 133 sends the part signal supplied from switch element 131 to receiver 82 via CEC line 84.In this way, the differential signal corresponding to Tx data is sent from HDMI (R) information source 71 to HDMI (R) stay of two nights 72.

When data is received, decoding unit 132 receives the differential signal corresponding to Rx data sent from receiver 82.That is, switch 133 receives the part signal corresponding to the differential signal of Rx data sent from receiver 82 via CEC line 84, and supplies the part signal received to decoding unit 132.Under the control of timing control unit 122, decoding unit 132 is decoded into original Rx data by by the part signal supplied from switch 133 with via holding wire 141 from the differential signal that the part signal that receiver 82 is supplied is formed, and exports original Rx data to HDMI (R) information source 71.

In this way, HDMI (R) information source 71 transmits the various data of such as control data, pixel data and voice data and so on for HDMI (R) stay of two nights 72.

If judge to carry out half-duplex operation in step S14, then in step S18, each assembly of HDMI (R) information source 71 is undertaken, with the two-way communication of HDMI (R) stay of two nights 72, then stopping communication process by the sending/receiving of CEC signal.

Namely, when sending out data, HDMI (R) information source 71 sends CEC signal via switch 133 and CEC line 84 to receiver 82, and when data is received, HDMI (R) information source 71 via switch 133 and CEC line 84 receive from receiver 82 send CEC signal, with HDMI (R) stay of two nights 72 transfer control signal.

In this way, HDMI (R) information source 71 with reference to half-duplex mark, and carries out the half-duplex operation with HDMI (R) stay of two nights 72 can carrying out half-duplex operation by use CEC line 84 and holding wire 141.

As mentioned above, can select to send data and receive data and communicate by carrying out half-duplex operation, i.e. IP with half-duplex operation method by diverter switch 133, use CEC line 84 and holding wire 141 to carry out communicating with the high-speed bidirectional of HDMI (R) stay of two nights 72, keep the compatibility with existing HDMI (R) simultaneously.

In addition, be similar to HDMI (R) information source 71, when connection is equipped with the power supply of the electronic installation of HDMI (R) stay of two nights 72, HDMI (R) stay of two nights 72 starts communication process, and carries out the two-way communication with HDMI (R) information source 71.

After this, with reference to the flow chart of Figure 11, will the communication process that performs of HDMI (R) stay of two nights 72 as shown in Figure 6 by describing.

In step S41, HDMI (R) stay of two nights 72 judges whether new electronic installation is connected to HDMI (R) stay of two nights 72.Such as, HDMI (R) stay of two nights 72 is called as " hot plug detection " according to being applied to and be connected to the amplitude of the voltage of the pin of holding wire 86, judge whether to be connected to the new electronic installation being equipped with HDMI (R) information source 71.

If judge not connect new electronic installation in step S41, then do not carry out communicating stops communication process.

On the other hand, if judge to be connected to new electronic installation in step S41, then in step S42, switch control unit 124 control switch 135 carrys out diverter switch 135 to select the CEC signal from HDMI (R) stay of two nights 72 when sending out data, and selects the CEC signal from reflector 81 when data is received.

In step S43, HDMI (R) stay of two nights 72 reads E-EDID from EDIDROM 85, and sends the E-EDID read to HDMI (R) information source 71 via DDC 83.

In step S44, HDMI (R) stay of two nights 72 judges whether to have received the channel information sent from HDMI (R) information source 71.

That is, according to the function processed by HDMI (R) information source 71 and HDMI (R) stay of two nights 72, the channel information representing bi-directional communication channel is sent from HDMI (R) information source 71.Such as, if HDMI (R) information source 71 has the structure shown in Fig. 6, then HDMI (R) information source 71 and HDMI (R) stay of two nights 72 can use CEC line 84 and holding wire 141 to carry out half-duplex operation.Therefore, the channel information making to use CEC line 84 and holding wire 141 to carry out IP and communicate is sent from HDMI (R) information source 71 to HDMI (R) stay of two nights 72.Via switch 135 and CEC line 84 from after HDMI (R) information source 71 transmitting channel information, HDMI (R) stay of two nights 72 judges to have received channel information.

On the other hand, if HDMI (R) information source 71 does not have half-duplex operation function, not from HDMI (R) information source 71 to HDMI (R) stay of two nights 72 transmitting channel information, HDMI (R) stay of two nights 72 is made to judge not receive channel information.

If judge to have received channel information in step S44, then process proceeds to step S45, herein, switch control unit 124 control switch 135 is with diverter switch 135, select the differential signal corresponding to Rx data from converting unit 134 when sending out data, and select the differential signal corresponding to Tx data from reflector 81 when data is received.

In step S46, each assembly of HDMI (R) stay of two nights 72 is undertaken communicating with the two-way IP of HDMI (R) information source 71 by half-duplex operation method, then stops communication process.Namely, when sending out data, under the control of timing control unit 123, the Rx data of supplying from HDMI (R) stay of two nights 72 are converted to differential signal by converting unit 134, and supply the part signal forming the differential signal obtained by changing to switch 135, and supply another part signal via holding wire 141 to reflector 81.Switch 135 sends the part signal supplied from converting unit 134 to reflector 81 via CEC line 84.In this way, the differential signal corresponding to Rx data is sent from HDMI (R) stay of two nights 72 to HDMI (R) information source 71.

When data is received, decoding unit 136 receives the differential signal corresponding to Tx data sent from reflector 81.That is, switch 135 receives the part signal corresponding to the differential signal of Tx data sent from reflector 81 via CEC line 84, and supplies the part signal received to decoding unit 136.Decoding unit 136 is decoded as original Tx data by by the part signal supplied from switch 135 with via holding wire 141 from the differential signal that the part signal that reflector 81 is supplied is formed, and exports original Tx data to HDMI (R) stay of two nights 72.

In this way, HDMI (R) stay of two nights 72 transmits the various data of such as control data, pixel data and voice data and so on for HDMI (R) information source 71.

If judge not receive channel information in step S44, in step S47, each assembly of HDMI (R) stay of two nights 72 is undertaken, with the two-way communication of HDMI (R) information source 71, then stopping communication process by the sending/receiving of CEC signal.

Namely, when sending out data, HDMI (R) stay of two nights 72 sends CEC signal via switch 135 and CEC line 84 to reflector 81, and when data is received, HDMI (R) stay of two nights 72 via switch 135 and CEC line 84 receive from reflector 81 send CEC signal, with HDMI (R) information source 71 communications of control data.

In this way, when receiving channel information, HDMI (R) stay of two nights 72 carries out the half-duplex operation with HDMI (R) stay of two nights 72 by using CEC line 84 and holding wire 141.

As mentioned above, CEC line 84 and holding wire 141 can be used between HDMI (R) stay of two nights 72 and HDMI (R) information source 71 to carry out half-duplex operation to select to send data and receive data by diverter switch 135, carry out high-speed bidirectional communication, keep the compatibility with existing HDMI (R) simultaneously.

In addition, if HDMI (R) information source 71 has the structure shown in Fig. 7, then in communication process, whether HDMI (R) information source 71 has full-duplex communication function from full duplex marker for judgment HDMI (R) stay of two nights 72 be comprised in E-EDID, and carries out two-way communication according to the result judged.

With reference to the flow chart shown in Figure 12, will the communication process that performs of HDMI (R) information source 71 as shown in Figure 7 by describing.

Judge whether new electronic installation is connected to HDMI (R) information source 71 in step S71, HDMI (R) information source 71.If judge not connect new electronic installation in step S71, then do not carry out communicating then stopping communication process.

On the other hand, if judge to be connected to new electronic installation in step S71, then in step S72, switch control unit 171 control switch 181 and 182 is with diverter switch 181 and 182, the SDA signal selecting from HDMI (R) information source 71 to make switch 181 when sending out data, and the SCL signal making switch 182 select from HDMI (R) information source 71, and the SDA signal making switch 181 select from HDMI (R) information source 71 when data is received.

In step S73, switch control unit 121 control switch 133, with diverter switch 133, to select the CEC signal from HDMI (R) information source 71 when sending out data, and selects the CEC signal from receiver 82 when data is received.

Receive the E-EDID sent from HDMI (R) stay of two nights 72 via the SDA line 191 of DDC 83 in step S74, HDMI (R) information source 71.That is, when the connection of HDMI (R) information source 71 being detected, HDMI (R) stay of two nights 72 reads E-EDID from EDIDROM 85, and sends via the SDA line 191 of DDC 83 E-EDID read to HDMI (R) information source 71.HDMI (R) information source 71 receives the E-EDID sent from HDMI (R) stay of two nights 72.

Judge to carry out the full-duplex communication with HDMI (R) stay of two nights 72 in step S75, HDMI (R) information source 71.That is, HDMI (R) information source 71 is with reference to the E-EDID received from HDMI (R) stay of two nights 72, and judges whether that being provided with the full duplex shown in Fig. 9 marks " full duplex ".Such as, if be provided with full duplex mark, HDMI (R) information source 71 judges to carry out two-way IP communication by duplex communication method, i.e. full-duplex communication.

If judge to carry out full-duplex communication in step S75, then in step S76, switch control unit 171 control switch 181 and 182 with diverter switch 181 and 182, to select when data is received to correspond to the differential signal of Rx data from receiver 82.

Namely, about forming when data is received from the part signal corresponding to the differential signal of Rx data that receiver 82 sends, switch control unit 171 diverter switch 181 and 182, selects the part signal via SDA line 191 transmission to make switch 181 and makes switch 182 select the part signal sent via scl line 192.

From HDMI (R) stay of two nights 72 to after HDMI (R) information source 71 sends E-EDID, do not use the SDA line 191 and scl line 192 that form DDC 83, namely do not carry out the sending/receiving of SDA and the SCL signal via SDA line 191 and scl line 192.Therefore, it is possible to use SDA line 191 and scl line 192 as the transmission line of Rx data during full-duplex communication.

In step S77, HDMI (R) information source 71 sends the signal of the channel information of the channel that representatively will be used for two-way communication to receiver 82 via switch 133 and CEC line 84, make to use CEC line 84 to carry out IP with scl line 192 by duplex communication method with SDA line 191 with holding wire 141 and communicate.

Namely, if be provided with full duplex mark, then HDMI (R) information source 71 can know that HDMI (R) stay of two nights 72 has the structure shown in Fig. 7, and CEC line 84 and holding wire 141 and SDA line 191 and scl line 192 can be used to carry out full-duplex communication.HDMI (R) information source 71, to HDMI (R) stay of two nights 72 transmitting channel information, makes to notify to carry out full-duplex communication.

In step S78, switch control unit 121 control switch 133, with diverter switch 133, selects the differential signal corresponding to Tx data from converting unit 131 when sending out data.That is, switch control unit 121 diverter switch 133, to select to correspond to Tx data and the part signal being fed to the differential signal of switch 133 from converting unit 131.

Undertaken communicating with the two-way IP of HDMI (R) stay of two nights 72 by duplex communication method in each assembly of step S79, HDMI (R) information source 71, then stop communication process.Namely, when sending out data, the Tx data of supplying from HDMI (R) information source 71 are converted to differential signal by converting unit 131, and supply the part signal forming and obtain differential signal by changing to switch 133, and supply another part signal via holding wire 141 to receiver 82.Switch 133 sends the part signal supplied from converting unit 131 to receiver 82 via CEC line 84.In this way, the differential signal corresponding to Tx data is sent from HDMI (R) information source 71 to HDMI (R) stay of two nights 72.

In addition, when data is received, decoding unit 183 receives the differential signal corresponding to Rx data sent from receiver 82.That is, switch 181 receives the part signal corresponding to the differential signal of Rx data sent from receiver 82 via SDA line 191, and supplies the part signal received to decoding unit 183.In addition, switch 182 receives another part signal corresponding to the differential signal of Rx data sent from receiver 82 via scl line 192, and supplies the part signal received to decoding unit 183.The differential signal be made up of the part signal supplied from switch 181 and 182 is decoded as original Rx data by decoding unit 183, and exports original Rx data to HDMI (R) information source 71.

In this way, HDMI (R) information source 71 transmits the various data of such as control data, pixel data and voice data and so on for HDMI (R) stay of two nights 72.

In addition, judge to carry out full-duplex communication in step S75, then in step S80, each assembly of HDMI (R) information source 71 is undertaken, with the two-way communication of HDMI (R) stay of two nights 72, then stopping communication process by the sending/receiving of CEC signal.

Namely, when sending out data, HDMI (R) information source 71 sends CEC signal via switch 133 and CEC line 84 to receiver 82, and when data is received, HDMI (R) information source 71 via switch 133 and CEC line 84 receive from receiver 82 send CEC signal, with HDMI (R) stay of two nights 72 communications of control data.

In this way, HDMI (R) information source 71 with reference to full duplex mark, and by using CEC line 84 and holding wire 141 and SDA line 191 and scl line 192 to carry out the full-duplex communication with HDMI (R) stay of two nights 72 can carrying out full-duplex communication.

As mentioned above, can by diverter switch 133,181 and 182 to select to send data and to receive data and by using CEC line 84 and holding wire 141 and SDA line 191 and scl line 192 and HDMI (R) stay of two nights 72 to carry out full-duplex communication, carry out high-speed bidirectional communication, keep the compatibility with existing HDMI (R) simultaneously.

Be similar to HDMI (R) stay of two nights 72 shown in Fig. 6, if HDMI (R) stay of two nights 72 has the structure shown in Fig. 7, then HDMI (R) stay of two nights 72 executive communication process is to carry out the two-way communication with HDMI (R) information source 71.

After this, with reference to the flow chart of Figure 13, will the communication process that performs of HDMI (R) stay of two nights 72 as shown in Figure 7 by describing.

In step S111, HDMI (R) stay of two nights 72 judges whether new electronic installation is connected to HDMI (R) stay of two nights 72.If judge not connect new electronic installation in step S111, then do not carry out communicating after this to stop this communication process.

On the other hand, if judge to be connected to new electronic installation in step S111, then in step S112, switch control unit 172 control switch 185 and 186 carrys out diverter switch 185 and 186, the SDA signal selecting from HDMI (R) stay of two nights 72 to make switch 185 when sending out data, and the SDA signal making switch 185 when data is received select from reflector 81, and the SCL signal from reflector 81 selected by switch 186.

In step S113, switch control unit 124 control switch 135 carrys out diverter switch 135, to select the CEC signal from HDMI (R) stay of two nights 72 when sending out data and to select the CEC signal from reflector 81 when data is received.

Read E-EDID in step S114, HDMI (R) stay of two nights 72 from EDIDROM 85, and send via the SDA line 191 of switch 185 and DDC 83 E-EDID read to HDMI (R) information source 71.

Judge whether in step S115, HDMI (R) stay of two nights 72 to have received the channel information sent from HDMI (R) information source 71.

That is, send according to the function processed by HDMI (R) information source 71 and HDMI (R) stay of two nights 72 channel information representing bi-directional communication channel from HDMI (R) information source 71.Such as, if HDMI (R) information source 71 has the structure shown in Fig. 7, then HDMI (R) information source 71 and HDMI (R) stay of two nights 72 can carry out full-duplex communication.HDMI (R) information source 71, to HDMI (R) stay of two nights 72 transmitting channel information, makes to use CEC line 84 to carry out IP with scl line 192 by duplex communication method with SDA line 191 with holding wire 141 and communicates.Via switch 135 and CEC line 84 from after HDMI (R) information source 71 have sent channel information, HDMI (R) stay of two nights 72 judges to have received channel information.

On the other hand, if HDMI (R) information source 71 does not have full-duplex communication function, then not from HDMI (R) information source 71 to HDMI (R) stay of two nights 72 transmitting channel information, HDMI (R) stay of two nights 72 is made to judge not receive channel information.

If judge to have received channel information in step S115, then process proceeds to step S 116, wherein, switch control unit 172 control switch 185 and 186, with diverter switch 185 and 186, selects the differential signal corresponding to Rx data from converting unit 184 when sending out data.

In step S117, switch control unit 124 control switch 135, with diverter switch 135, selects the differential signal corresponding to Tx data from reflector 81 when data is received.

In step S118, each assembly of HDMI (R) stay of two nights 72 is undertaken communicating with the two-way IP of HDMI (R) information source 71 by duplex communication method, then stops communication process.Namely, when sending out data, the Rx data of supplying from HDMI (R) stay of two nights 72 are converted to differential signal by converting unit 184, and supply the part signal forming the differential signal obtained by changing to switch 185, and supply another part signal to switch 186.Switch 185 and 186 sends via SDA line 191 and scl line 192 part signal supplied from converting unit 184 to reflector 81.In this way, the differential signal corresponding to Rx data is sent from HDMI (R) stay of two nights 72 to HDMI (R) information source 71.

In addition, when data is received, decoding unit 136 receives the differential signal corresponding to Tx data sent from reflector 81.That is, switch 135 receives the part signal corresponding to the differential signal of Tx data sent from reflector 81 via CEC line 84, and supplies the part signal received to decoding unit 136.Decoding unit 136 is decoded into original Tx data by by the part signal supplied from switch 135 with via holding wire 141 from the differential signal that the part signal that reflector 81 is supplied is formed, and exports original Tx data to HDMI (R) stay of two nights 72.

In this way, HDMI (R) stay of two nights 72 transmits the various data of such as control data, pixel data and voice data and so on for HDMI (R) information source 71.

If judge not receive channel information in step S115, then in step S119, each assembly of HDMI (R) stay of two nights 72 is undertaken, with the two-way communication of HDMI (R) information source 71, then stopping communication process by the sending/receiving of CEC signal.

In this way, when receiving channel information, HDMI (R) stay of two nights 72 carries out the full-duplex communication with HDMI (R) stay of two nights 72 via CEC line 84 and holding wire 141 and SDA line 191 and scl line 192.

As mentioned above, full-duplex communication can be carried out between HDMI (R) stay of two nights 72 and HDMI (R) information source 71 by using CEC line 84 and holding wire 141 and SDA line 191 and scl line 192, and select send data and receive data by diverter switch 135,185 and 186, carry out high-speed bidirectional communication, keep the compatibility with existing HDMI (R) simultaneously.

Notice, although in example in the figure 7, structure HDMI (R) information source 71 is to be connected to CEC line 84 and holding wire 141 by converting unit 131, and decoding unit 183 is connected to SDA line 191 and scl line 192, but this structure can be, decoding unit 183 is connected to CEC line 84 and holding wire 141, and converting unit 131 is connected to SDA line 191 and scl line 192.

In this case, switch 181 and 182 is connected respectively to CEC line 84 and holding wire 171 and is connected to decoding unit 183, and switch 133 is connected to SDA line 191 and is connected to converting unit 131.

Similarly, HDMI (R) stay of two nights 72 shown in Fig. 7 can be configured so that converting unit 184 is connected to CEC line 84 and holding wire 141 and decoding unit 136 is connected to SDA line 191 and scl line 192.In this case, switch 185 and 186 is connected to CEC line 84 and holding wire 141 respectively, and to converting unit 184, and switch 135 is connected to SDA line 191 and arrives decoding unit 136.

In addition, in figure 6, CEC line 84 and holding wire 141 can be replaced with SDA line 191 and scl line 192.Namely, the converting unit 134 of the converting unit 131 of HDMI (R) information source 71 and decoding unit 132 and HDMI (R) stay of two nights 72 and decoding unit 136 are connected to SDA line 191 and scl line 192, make HDMI (R) information source 71 carry out IP with HDMI (R) stay of two nights 72 by half-duplex operation method and communicate.In this case, can by the connection utilizing the reserved pin being connected to the connector of holding wire 141 to carry out detection. electronics.

In addition, HDMI (R) information source 71 and each of HDMI (R) stay of two nights 72 have half-duplex operation function and full-duplex communication function.In this case, HDMI (R) information source 71 and HDMI (R) stay of two nights 72 according to the function by the electronics process be connected, can carry out IP communication by half-duplex operation method or duplex communication method.

If HDMI (R) information source 71 and each of HDMI (R) stay of two nights 72 have half-duplex operation function and full-duplex communication function, then HDMI (R) information source 71 and HDMI (R) stay of two nights 72 by such as Figure 14 construct.Notice, in fig. 14, the part representing shown in Fig. 6 or 7 corresponding to those by same-sign, and suitably the descriptions thereof are omitted.

HDMI (R) information source 71 shown in Figure 14 is made up of reflector 81, switch control unit 121, timing control unit 122 and switch control unit 171.Reflector 81 has converting unit 131, decoding unit 132, switch 133, switch 181, switch 182 and decoding unit 183.That is, HDMI (R) information source 71 shown in Figure 14 has following structure: the timing control unit 122 shown in Fig. 6 and decoding unit 132 are added to HDMI (R) information source 71 shown in Fig. 7.

HDMI (R) stay of two nights 72 shown in Figure 14 is made up of receiver 82, timing control unit 123, switch control unit 124 and switch control unit 172.Receiver 82 has converting unit 134, switch 135, decoding unit 136, converting unit 184, switch 185 and switch 186.That is, HDMI (R) stay of two nights 72 shown in Figure 14 has following structure: the timing control unit 122 shown in Fig. 6 and converting unit 134 are added to HDMI (R) stay of two nights 72 shown in Fig. 7.

Next, will the communication process that performs of HDMI (R) information source 71 as shown in Figure 14 and HDMI (R) stay of two nights 72 by describing.

First, with reference to the flow chart shown in Figure 15, by the communication process that HDMI (R) information source 71 described as shown in Figure 14 performs.Notice, be similar to the process of step S71 to the S74 shown in Figure 12 in the process of step S151 to S154, and therefore the descriptions thereof are omitted.

Judge whether to carry out full-duplex communication with HDMI (R) stay of two nights 72 in step S155, HDMI (R) information source 71.That is, HDMI (R) information source 71 is with reference to the E-EDID received from HDMI (R) stay of two nights 72, and judges whether that the full duplex be provided with as shown in Figure 9 marks " full duplex ".

If judge to carry out full-duplex communication in step S155, namely, if the HDMI shown in Figure 14 or Fig. 7 (R) stay of two nights 72 is connected to HDMI (R) information source 71, then in step S156, switch control unit 171 control switch 181 and 182 carrys out diverter switch 181 and 182, to select the differential signal corresponding to Rx data from receiver 82 when data is received.

If judge to carry out full-duplex communication in step S155, then judge whether to carry out half-duplex operation in step S157, HDMI (R) information source 71.That is, HDMI (R) information source 71 is with reference to received E-EDID, and judges whether that being provided with the half-duplex shown in Fig. 9 marks " half-duplex ".In other words, HDMI (R) information source 71 judges whether HDMI (R) stay of two nights 72 shown in Fig. 6 is connected to HDMI (R) information source 71.

If judge to carry out half-duplex operation in step S157, if or in step S156, have switched switch 181 and 182, then in step S158, HDMI (R) information source 71 via switch 133 and CEC line 84 to receiver 82 transmitting channel information.

If judge to carry out full-duplex communication in step S155, because HDMI (R) stay of two nights 72 has full-duplex communication function, then HDMI (R) information source 71 sends the signal as channel information via switch 133 and CEC line 84 to receiver 82, makes to use CEC line 84 to carry out IP with holding wire 141 and SDA line 191 with scl line 192 and communicates.

If judge to carry out half-duplex operation in step S157, due to HDMI (R) although the stay of two nights 72 does not have full-duplex communication function but have half-duplex operation function, therefore, HDMI (R) information source 71 sends the signal as channel information via switch 133 and CEC line 84 to receiver 82, makes to use CEC line 84 to carry out IP with holding wire 141 and communicates.

In step S159, switch control unit 121 control switch 133 is with diverter switch 133, select the differential signal corresponding to Tx data from converting unit 131 when sending out data, and select the differential signal corresponding to Rx data from receiver 82 transmission when data is received.Note, if full-duplex communication is carried out in HDMI (R) information source 71 and HDMI (R) stay of two nights 72, then do not send via CEC line 84 and holding wire 141 differential signal corresponding to Rx data from receiver 82 when HDMI (R) information source 71 receives data, thus do not supply the differential signal corresponding to Rx data to decoding unit 132.

Carry out communicating with the two-way IP of HDMI (R) stay of two nights 72 in each assembly of step S160, HDMI (R) information source 71, then stop communication process.

Namely, when HDMI (R) information source 71 carries out full-duplex communication and half-duplex operation with HDMI (R) stay of two nights 72, the Tx data of supplying from HDMI (R) information source 71 are converted to differential signal when sending data by converting unit 131, and supply via switch 133 and CEC line 84 part signal forming the differential signal obtained by changing to receiver 82, and supply another part signal via holding wire 141 to receiver 82.

In addition, when HDMI (R) information source 71 carries out full-duplex communication with HDMI (R) stay of two nights 72, and when data is received, decoding unit 183 receives the differential signal corresponding to Rx data sent from receiver 82, and convert received differential signal to original Rx data, and export original Rx data to HDMI (R) information source 71.

On the other hand, when HDMI (R) information source 71 carries out half-duplex operation with HDMI (R) stay of two nights 72, and when data is received, under the control of timing control unit 122, decoding unit 132 receives the differential signal corresponding to Rx data sent from receiver 82, and received differential signal is decoded into original Rx data, and export original Rx data to HDMI (R) information source 71.

In this way, HDMI (R) information source 71 transmits the various data of such as control data, pixel data and voice data and so on for HDMI (R) stay of two nights 72.

In addition, if judge to carry out half-duplex operation in step S157, then in step S161, each assembly of HDMI (R) information source 71 is undertaken, with the two-way communication of HDMI (R) stay of two nights 72, then stopping communication process by the sending/receiving of the CEC signal via CEC line 84.

In this way, HDMI (R) information source 71 is with reference to full duplex mark and half-duplex mark, and the function handled by communication partner HDMI (R) stay of two nights 72, carry out and the complete of HDMI (R) stay of two nights 72 or half-duplex operation.

As mentioned above, can select send data and receive data by diverter switch 133,181 and 182, and carry out and the complete of HDMI (R) stay of two nights 72 or half-duplex operation according to the function handled by communication partner HDMI (R) stay of two nights 72, carry out high-speed bidirectional communication, keep the compatibility with existing HDMI (R) simultaneously, and select optimal communication method.

Next, with reference to the flow chart shown in Figure 16, by the communication process that HDMI (R) stay of two nights 72 described as shown in Figure 14 performs.Notice, be similar to the process in step S111 to S114 shown in Figure 13 in the process of step S191 to S194, and therefore the descriptions thereof are omitted.

Receive the channel information sent from HDMI (R) information source 71 via switch 135 and CEC line 84 in step S195, HDMI (R) stay of two nights 72.Notice, if HDMI (R) information source 71 being connected to HDMI (R) stay of two nights 72 neither has full-duplex communication function and does not also have half-duplex operation function, then will not from HDMI (R) information source 71 to HDMI (R) stay of two nights 72 transmitting channel information, not receiving channel information is incited somebody to action in HDMI (R) stay of two nights 72.

Judge whether to carry out full-duplex communication from received channel information in step S196, HDMI (R) stay of two nights 72.Such as, if HDMI (R) stay of two nights 72 receiving channel information communicates to make using CEC line 84 to carry out IP with holding wire 141 and SDA line 191 with scl line 192, HDMI (R) stay of two nights 72 judges to have carried out full-duplex communication.

If judge to have carried out full-duplex communication in step S196, then in step S197, switch control unit 172 control switch 185 and 186 carrys out diverter switch 185 and 186, selects the differential signal corresponding to Rx data from converting unit 184 when sending out data.

In addition, if judge not carry out full-duplex communication in step S196, then judge whether to carry out half-duplex operation from received channel information in step S198, HDMI (R) stay of two nights 72.Such as, if HDMI (R) stay of two nights 72 receiving channel information communicates to make using CEC line 84 to receive IP with holding wire 141, then HDMI (R) stay of two nights 72 judges to have carried out half-duplex operation.

If judge to have carried out half-duplex operation in step S198, if or judge to have switched switch 185 and 186 in step S197 in step S197, then step S199, switch control unit 124 control switch 135 is with diverter switch 135, select the differential signal corresponding to Rx data from converting unit 134 when sending out data, and select the differential signal corresponding to Tx data from reflector 81 when data is received.

Notice, if full-duplex communication is carried out in HDMI (R) information source 71 and HDMI (R) stay of two nights 72, then when sending data at HDMI (R) stay of two nights 72 place, do not send the differential signal corresponding to Rx data from converting unit 134 to reflector 81.Therefore, do not supply to switch 135 differential signal corresponding to Rx data.

Carry out communicating with the two-way IP of HDMI (R) information source 71 in each assembly of step S200, HDMI (R) stay of two nights 72, then stop communication process.

Namely, if HDMI (R) stay of two nights 72 and HDMI (R) information source 71 carry out full-duplex communication and when sending out data, the Rx data transaction of supplying from HDMI (R) stay of two nights 72 is become differential signal by converting unit 184, and supply via switch 185 and SDA line 191 part signal forming the differential signal obtained by changing to reflector 81, and supply another part signal via switch 186 and scl line 192 to reflector 81.

In addition, if HDMI (R) stay of two nights 72 and HDMI (R) information source 71 carry out half-duplex operation, and when sending out data, the Rx data of supplying from HDMI (R) stay of two nights 72 are converted to differential signal by converting unit 134, and supply via switch 135 and CEC line 84 part signal forming the differential signal obtained by changing to reflector 81, and supply another part signal via holding wire 141 to reflector 81.

In addition, if HDMI (R) stay of two nights 72 and HDMI (R) information source 71 carry out full-duplex communication and half-duplex operation and when data is received, decoding unit 136 receives the differential signal corresponding to Tx data sent from reflector 81, and received differential signal is decoded into original Tx data, and export original Tx data to HDMI (R) stay of two nights 72.

In addition, if judge not carry out half-duplex operation in step S198, namely, such as, not transmitting channel information, when when step S201, each assembly of HDMI (R) stay of two nights 72 is undertaken, with the two-way communication of HDMI (R) information source 71, then stopping communication process by the sending/receiving of CEC signal.

In this way, HDMI (R) stay of two nights 72, according to received channel information, namely carries out full-duplex communication or half-duplex operation according to the function processed by communication partner HDMI (R) information source 71.

As mentioned above, can by carrying out full-duplex communication or half-duplex operation between HDMI (R) stay of two nights 72 and HDMI (R) information source 71, and select send data and receive data according to the function handled by communication partner HDMI (R) information source 71 by diverter switch 135,185 and 186, carry out high-speed bidirectional communication, keep the compatibility with existing HDMI (R) simultaneously, and select optimal communication method.

In addition, can by being connected HDMI (R) information source 71 and HDMI (R) stay of two nights 72 with holding wire 141 and SDA line 191 with HDMI (R) cable 35 of scl line 192 with comprising CEC line 84, high-speed bidirectional IP communication is carried out by half-duplex operation method or duplex communication method, keep the compatibility with existing HDMI (R) cable simultaneously, wherein, CEC line 84 and holding wire 141 are differential twisted pair by distribution, and conductively-closed and be connected to ground wire, and SDA line 191 and scl line 192 are differential twisted pair by distribution, and conductively-closed and be connected to ground wire.

As mentioned above, any one selecting one or more data centralization is as transmission data, via prearranged signals alignment, communication partner sends selected data, and any one selecting the one or more data centralizations sent from communication partner, as reception data, and receives selected data.Therefore, high-speed bidirectional IP communication can be carried out via HDMI (R) cable 35 between HDMI (R) information source 71 and HDMI (R) stay of two nights 72, keep the compatibility with HDMI (R) simultaneously, that is, allow to send unpressed image pixel data from HDMI (R) information source 71 to HDMI (R) stay of two nights 72 high speed uniaxially simultaneously.

Therefore, if be equipped with the source device of HDMI (R) information source 71 wherein, such as the electronic installation of all transcribers 33 as shown in Figure 2 and so on has the server capability of such as DLNA (DLNA) and so on, and be equipped with the sink device of HDMI (R) stay of two nights 72 wherein, such as the electronic installation of all digital televisions 31 as shown in Figure 2 and so on has the LAN communication interface of such as Ethernet (registered trade mark) and so on, then by direct two-way IP communication or can communicate via the two-way IP of the electronic installation of the amplifier 32 such as connected by HDMI (R) cable and so on, content is sent from source device to sink device via HDMI (R) cable, and send content from source device, from sink device to be connected to sink device LAN communication interface another device (such as, digital television 34 shown in Fig. 2) send content.

In addition, by the two-way IP communication between HDMI (R) information source 71 and HDMI (R) stay of two nights 72, High Speed Transfer control command and response between the source device of HDMI (R) information source 71 and the sink device being equipped with HDMI (R) stay of two nights 72 interconnected by HDMI (R) cable 35 wherein can be equipped with wherein.Therefore, it is possible to carry out control device by high-speed response.

Next, above-mentioned a series of process can be realized by specialized hardware or software.If this series of processes will be realized by software, then in the microcomputer etc. of control HDMI (R) information source 71 and HDMI (R) stay of two nights 72, the program forming software is installed.

Figure 17 show according to embodiment, the example of the structure of having installed the computer of the program for performing above-mentioned series of processes.

Can in as the EEPROM (Electrically Erasable Read Only Memory) 305 of the recording medium be equipped with in a computer or ROM 303 logging program.

Alternatively, program temporarily or for good and all can be stored (record) in the removable recording medium of such as floppy disk, CD-ROM (aacompactadisk read onlyamemory), MO (magneto-optic) dish, DVD (digital multi-purpose disk), disk and semiconductor memory and so on.This removable recording medium can be rendered as so-called canned software.

Notice, program can be installed to computer from above-mentioned removable recording medium, from download website, program wirelessly can be sent to computer via digital satellite broadcasting artificial satellite, or via the network of such as LAN and internet and so on, program can be sent to computer through a cable, and computer receives the program transmitted at I/O interface 306 place, and in built-in EEPROM 305 installation procedure.

Computer has built-in CPU (CPU) 302.This CPU 302 is connected to I/O interface 306 via bus 301, and the program be stored in ROM (read-only memory) 303 or EEPROM 305 is loaded in RAM (random access memory) 304 with executive program, therefore, CPU 302 process that performs the process in above-mentioned flow chart and will be undertaken by the structure shown in above-mentioned block diagram.

In addition, computer has display unit 307 and loud speaker 308.Display unit 307 is made up of such as LCD (liquid crystal display), and shows the vision signal generated by CPU 302.Notice, display unit 307 can be merged in computer, maybe can be externally connected to computer.Loud speaker 308 exports the audio signal generated by CPU 302.Loud speaker 308 can also be merged in computer, maybe can be externally connected to computer.

At this, in the description, describe and be provided for the treatment step that computer performs the program of various process and not necessarily need to perform in chronological order by the order of the statement of writing in flow chart, and the parallel or independent process (such as, parallel processing or the process undertaken by object) performed can be comprised.

In addition, executive program can be carried out by a computer, or executive program in a distributed manner can be carried out by multiple computer.

Certainly, as source device and sink device, not only can use computer, any electronic installation of such as television equipment and data recording/reproducing device can also be used.These other devices also have and those the similar assemblies shown in Figure 17.

Should note, the present invention can be applied to by the communication interface formed for following dispensing device and receiving system, this dispensing device is used for as the differential signal of display data corresponding to the uncompressed image of a screen in from a vertical synchronizing signal to the effective video cycle that next vertical synchronizing signal deducts horizontal blanking period and vertical blanking period via multiple channel to the unidirectional transmission of receiving system, and receiving system is used for receiving via multiple channel the differential signal sent from dispensing device.

In an embodiment, by controlling data selection timing between HDMI (R) information source 71 and HDMI (R) stay of two nights 72 if desired, differential signal receives timing and sends timing with differential signal and carry out two-way IP and communicate, but can carry out two-way communication according to the agreement being different from IP.

It should be noted that embodiments of the invention are not limited to above-described embodiment, and can carry out various amendment when not departing from feature of the present invention.

According to above-described embodiment, two-way communication can be carried out.Particularly, can communicate high-speed bidirectional can be carried out in the pixel data of the unidirectional transmission of high speed unpressed image and communication interface with the voice data of pixel data, keep compatible simultaneously.

Mentioning along band, although partly covers the technology described, providing the LAN communication function of the object for browsing two-way program, complicated Long-distance Control, reception electric program guide etc. to many audio/video devices.

As the means for forming network in the middle of audio/video device, existing and selecting candidate, the private cable of such as distribution such as CAT5 and so on, radio communication and electric light communication.

But private cable makes the connection in the middle of device complicated, and the shortcoming that radio communication and electric light communication have is complicated modulation circuit and transceiver costliness.

Therefore, the technology of not adding new connector electrode to HDMI interpolation LAN communication function is above embodiments described.

Due to, HDMI is replacement for being carried out video data and the device information of audio data transmission, connection by use cable and the interface that communicates of checking with device control data, therefore, the large advantage that HDMI has is, LAN communication can be carried out by added LAN function, and not use private cable and radio communication etc.

Mention along band, the technology being published as above-described embodiment provides and to be communicated the difference transmission lines that uses communicating for the replacement of device information that connects and checking and device control data by LAN.

By HDMI, the parasitic capacitance of the device characteristic electron be connected not only has serious restriction to the replacement of the information of the device be connected and the DDC of checking with impedance, also has serious restriction to the CEC of the communication for device control data.

Particularly, when LOW is output and is boosted to the power supply of the about 2k Ω in HIGH state, the DDC terminal parasitic capacitance of device needs to be 50pF or less, and impedance needs the ground GND being grounding to 200 Ω or less.

Meanwhile, sending/receiving terminal needs to be terminated in high frequency band at least about 100 Ω, sends the LAN communication of high speed signal so that stable.

Figure 19 show for LAN communication reflector 404 and reflector 405 always AC-be coupled to the state of the DDC line of existing HDMI source device 401 and existing HDMI sink device 402.

In order to meet the restriction of DDC parasitic capacitance, the LAN emitter/receiver circuit being added to DDC line needs the AC had via enough little electric capacity to be coupled.Therefore, greatly weaken lan signal, and lan signal has distortion, to such an extent as to this reflector and receiver can be compensated may become complicated and expensive.

In addition, LAN may be hindered to communicate in the transformation of DDC communication period between HIGH and LOW state.That is, worry, LAN does not work in DDC communication period.

Therefore, below, communication system as preferred embodiment will be described, it is characterized in that, by using cable substantially to carry out in the interface that communicates with LAN of communicating of video data and audio data transmission, the replacement of device information that is connected and checking, device control data, carry out LAN communication by the two-way communication via a pair difference transmission lines, and carry out the connection status of notification interface by least one DC bias voltage of transmission line.

Technology described below not necessarily needs to have the selected cell as in the above-described embodiments.

Figure 18 illustrates the circuit diagram wherein being carried out the example of the first structure of the communication system of the connection status of notification interface by least one DC bias voltage of transmission line.

Figure 19 shows the example of the system when using in Ethernet (registered trade mark).

As shown in figure 18, this communication system 400 is made up of LAN Function Extension HDMI (being after this abbreviated as EH) source device 401, EH sink device 402, EH cable 403, Ethernet (registered trade mark) reflector 404 and Ethernet (registered trade mark) receiver 405 for interconnect EH source device and EH sink device.

EH source device 401 has lan signal transmitter circuit 411, termination resistor 412, AC coupling capacitor 413 and 414, lan signal acceptor circuit 415, subtraction circuit 416, boosting (pull-up) resistor 421, the resistor 422 forming low pulsed filter and capacitor 423, comparator 424, decompression capacitor 431, the resistor 432 forming low pass filter and capacitor 433 and comparator 434.

The resistor 462 and 463 that EH sink device 402 has lan signal transmitter circuit 441, termination resistor 442, AC coupling capacitor 443 and 444, lan signal acceptor circuit 445, subtraction circuit 446, decompression capacitor 451, the resistor 452 forming low pulsed filter and capacitor 453, comparator 454, choking-winding (choke coil) 461 and is connected in series between electrical source voltage and reference potential.

EH cable 403 has the difference transmission lines be made up of reserved line 501 and HPD line 502, provides the information source lateral terminal 512 of the information source lateral terminal 511 of reserved line 501, HPD line 502, the reserved stay of two nights lateral terminal 521 of line 501 and the stay of two nights lateral terminal 522 of HPD line to them.Reserved line 501 and HPD line 502 are differential twisted pair by distribution.

In the communication system 400 as above constructed, in source device 401, via AC coupling capacitor 413 and 414, terminal 511 and 512 is connected to termination resistor 412, lan signal transmitter circuit 411 and lan signal acceptor circuit 415.

Subtraction circuit 416 receives the summation signals SG412 being multiplied by the load stopping capacitor 412 and transmission line 501 and 502 and the signal voltage transmission generated and the reception voltage signal of the signal sent from EH sink device 402 by the electric current exported from lan signal transmitter circuit 411.

In subtraction circuit 416, the signal SG413 obtained by deducting transmission signal SG411 from summation signals SG412 is the net signal sent from the stay of two nights.

Sink device 402 has similar circuit network.By these circuit networks, source device 401 is carried out two-way LAN with sink device 402 and is communicated.

Except above-mentioned LAN communication, HPD line 502 notifies source device 401 by using DC bias level, and cable 403 is connected to sink device 402.

When cable 403 is connected to sink device 402, the resistor 462 and 463 of sink device 402 and choking-winding 461 arrive about 4V via terminal 522 bias voltage HPD line 502.

Source device 401 is extracted in the DC bias voltage at HPD line 502 place by the low pass filter be made up of resistor 432 and capacitor 433, and comparator 434 compares DC bias voltage and reference potential Vref2 (such as, 1.4V).

If cable 403 is free of attachment to source device 402, then because the electromotive force of dropping resistor 431 at terminal 512 place is lower than reference potential Vref2, and if connect, then this electromotive force is higher than reference potential.

Therefore, if the output signal SG415 of comparator 434 is HIGH, then mean that cable 403 is connected to sink device 402.

If the output signal SG415 of comparator 434 is LOW, then mean that cable 403 is free of attachment to sink device 402.

The example of the first structure also have device that the opposed ends that is mutually identified in cable 403 from the DC bias potential of reserved line 501 connects be EH compatible apparatus or not with the function of the HDMI device of EH compatibility.

EH source device 401 to be boosted (+5V) reserved line 501 by resistor 421, and EH sink device 402 is come reserved line step-down by resistor 451.

These resistors 421 and 451 are not present in not with the device of EH compatibility.

EH source device 401 compares the low pass filter through being made up of resistor 422 and capacitor 423 and the DC electromotive force at reserved line 501 place and reference voltage Vref 1 by comparator 424.

If sink device 402 is compatible with EH, and has buck functionality, then the electromotive force being positioned at reserved line 501 place is 2.5V, and if sink device is compatible with EH, and do not have buck functionality, then the electromotive force being positioned at reserved line place is 5V.Therefore, if reference potential Vref1 is 3.75V, then compatible sink device and incompatible sink device can be distinguished.

Sink device 402 compares the low pass filter through being made up of resistor 452 and capacitor 453 and the DC electromotive force at reserved line 501 place and reference voltage Vref 3. by comparator 454.

If source device 402 is compatible and have boost function with EH, then electromotive force is 2.5V, and if source device is compatible with EH, then electromotive force is 0V.Therefore, if reference potential is 1.25V, then the compatible source device of EH and the incompatible source device of EH can be distinguished.

As mentioned above, according to the example of the first structure, in the interface that communicates with LAN of communicating being carried out video data and audio data transmission, the replacement of device information that is connected and checking, device control data by use cable 403, carry out LAN communication via a pair difference transmission lines by two-way communication, and carry out the connection status of notification interface by least one DC bias potential of transmission line.Therefore, physics and the space that can carry out scl line and SDA line separate, so that they are not used in LAN communication.

Therefore, this division allows independently to form LAN telecommunication circuit with the electrical specifications specified for DDC, and can realize stable and reliable LAN communication at low cost.

It should be noted that in EH source device 401, but in EH cable 403, the ballast resistor 421 shown in Figure 18 to be provided.In this case, the terminal of ballast resistor 421 is connected to the line (holding wire) being connected to power supply (electrical source voltage) in reserved line 501 and the line that provides in EH cable 403 respectively.

In addition, in EH sink device 402, and dropping resistor 451 and resistor 463 can not be provided in EH cable 403.In this case, the terminal of dropping resistor 451 be connected respectively in reserved line 501 and the line that provides in EH cable 403 be connected to the line (ground wire) of (reference potential).In addition, the terminal of resistor 463 is connected to HPD line 502 and the ground of being connected in the line that provides in EH cable 403 line (ground wire) of (reference potential) respectively.

Figure 20 illustrates the circuit diagram wherein being notified the example of the second structure of the communication system of the connection status of this interface by least one DC bias potential of transmission line.

Substantially similar with the example of the first structure, the feature of this communication system 600 is, in the interface that communicates with LAN of communicating of the replacement being carried out video data and audio data transmission, institute's jockey information by use cable and checking, device control data, by carrying out LAN communication via the one-way communication of two pairs of difference transmission lines, and notified the connection status of this interface by least one DC bias potential of transmission line, the replacement and checking of sequentially carrying out institute's jockey information and at least two transmission lines are used to communicate with LAN.

As shown in figure 20, this communication system 600 is made up of LAN Function Extension HDMI (being after this called for short EH) source device 601, EH sink device 602 and the EH cable 603 for interconnect EH source device and EH sink device.

EH source device 601 has lan signal transmitter circuit 611, termination resistor 612 and 613, AC coupling capacitor 614 to 617, lan signal acceptor circuit 618, reverser 620, resistor 621, form resistor 622 and the capacitor 623 of low pulsed filter, comparator 624, dropping resistor 631, the resistor 632 of composition low pass filter and capacitor 633, comparator 634, NOR door 640, analog switch 641 to 644, reverser 635, analog switch 646 and 747, DDC transceiver 651 and 652 and ballast resistor 653 and 654.

EH sink device 602 has lan signal transmitter circuit 661, termination resistor 662 and 663, AC coupling capacitor 664 to 667, lan signal acceptor circuit 668, dropping resistor 671, form resistor 672 and the capacitor 673 of low pulsed filter, comparator 674, choking-winding 681, the resistor 682 and 683 be connected in series between electrical source voltage and reference potential, analog switch 691 to 694, reverser 695, analog switch 696 and 697, DDC transceiver 701 and 702, with ballast resistor 703.

EH cable 603 has the difference transmission lines be made up of reserved line 801 and scl line 803 and the difference transmission lines be made up of SDA line 804 and HPD line 802, provides information source lateral terminal 811 to 814 and stay of two nights lateral terminal 821 to 824 to them.

Reserved line 801 and scl line 803 and SDA line 804 and HPD line 802 are differential twisted pair by distribution.

In the communication system 600 as above constructed, in source device 601, terminal 811 and 813 is connected to for sending to the stay of two nights transmitter circuit 611 that LAN sends signal SG611 via AC coupling capacitor 614 and 615 and analog switch 641 and 642, and is connected to termination resistor 612.

Terminal 814 and 812 is connected to the acceptor circuit 618 for receiving lan signal from sink device 602 via AC coupling capacitor 616 and 617 and analog switch 643 and 644, and is connected to termination resistor 613.

In this sink device 602, terminal 821 to 824 is connected to reflector and acceptor circuit 668 and 661 and termination resistor 662 and 663 via AC coupling capacitor 664,665,666 and 667 and analog switch 691 to 694.

Analog switch 641 to 644 is connected when carrying out LAN and communicating with 691 to 694, and disconnects when carrying out DDC communication.

Terminal 813 to 814 is connected to DDC transceiver 651 and 652 and ballast resistor 653 and 654 via other analog switches 646 and 647 by source device 601.

Terminal 823 and 824 is connected to DDC transceiver 701 and 702 and ballast resistor 703 via analog switch 696 and 697 by sink device 602.

Analog switch 646,647,696 is connected when carrying out DDC and communicating with 697 and is disconnected when carrying out DLAN communication.

By identical to the recognition mechanism of EH compatible apparatus substantially with the example of the first structure of the electromotive force at reserved line 801 place, except being driven the resistor 62 of source device 601 by reverser 620.

When to reverser 620 be input as HIGH time, resistor 621 is used as the dropping resistor of the 0V state being provided as the state identical with when being connected to EH compatible apparatus from the angle of sink device 602.

Therefore, the signal SG623 of the EH of sink device 602 compatibility mark result is indicated to become LOW, so that the analog switch 691 to 694 controlled by signal SG623 disconnects and analog switch 696 and 697 connection controlled by the signal by obtaining at reverser 695 reverse signal SG623.

Therefore, sink device 602, by scl line 803 and SDA line 804 being disconnected from LAN transceiver, inputs DDC transceiver connection status.

Meanwhile, in source device 601, the input of reverser 620 is also imported into it and exports the NOR door 640 that SG614 becomes LOW.

The analog switch 641 and 644 controlled by the output signal SF614 of NOR door 640 disconnects, and the analog switch 646 and 647 controlled by the signal by obtaining at reverser 645 reverse signal SF614 is connected.

Therefore, source device 601 is also by inputting DDC transceiver connection status by scl line 803 and SDA line 804 from the disconnection of LAN transceiver.

On the contrary, when to reverser 620 be input as LOW time, source device 601 and sink device 602 input LAN transceiver connection status by scl line 803 and SDA line 804 being disconnected from DDC transceiver.

For there is the function similar with the example of the first structure by carrying out connecting the circuit 631 to 634 and 681 to 683 confirmed in the DC bias potential at HPD line 802 place.

That is, HPD line 802 communicates for above-mentioned LAN, and additionally by use DC bias level notice source device 601, cable 803 is connected to sink device 602.

When cable 603 is connected to sink device 602, HPD line 802 is biased into about 4V via terminal 822 by the resistor 682 and 683 in sink device 602 and choking-winding 681.

Source device 601 is extracted in the DC bias voltage at HPD line 802 place by the low pass filter be made up of resistor 632 and capacitor 633, and compares DC bias voltage and reference potential Vref2 (such as, 1.4V) by comparator 634.

If cable 603 is connected to source device 602, then due to dropping resistor 631, the electromotive force at terminal 812 place lower than reference potential Vref2, and if connect, then this electromotive force is higher than this reference potential.

Therefore, if the output signal SG613 of comparator 634 is HIGH, then mean that cable 803 is connected to sink device 602.

And, if the output signal SG613 of comparator 634 is LOW, then mean that cable 603 is not connected to sink device 602.

As mentioned above, according to the example of the second structure, in the interface that communicates with LAN of communicating being carried out video data and audio data transmission, the replacement of device information that is connected and checking, device control data by use cable, by carrying out LAN communication via the one-way communication of two pairs of difference transmission lines, and notified the connection status of this interface by least one DC bias potential of transmission line, and in addition at least two transmission lines are used to communicate with LAN the replacement of institute's jockey information and communicating of checking sequentially carried out.This division allows independently to form LAN telecommunication circuit with the electrical specifications specified for DDC, and can realize stable and reliable LAN communication at low cost.

It should be noted that in EH source device 601, but in EH cable 603, the resistor 621 shown in Figure 20 to be provided.In this case, the terminal of resistor 621 is connected to the line (holding wire) being connected to power supply (electrical source voltage) in reserved line 801 and the line that provides in EH cable 603 respectively.

In addition, in EH sink device 602, and dropping resistor 671 and resistor 683 can not be provided in EH cable 603.In this case, the terminal of dropping resistor 671 be connected respectively in reserved line 801 and the line that provides in EH cable 603 be connected to the line (ground wire) of (reference potential).In addition, the terminal of resistor 483 is connected to HPD line 802 and the ground of being connected in the line that provides in EH cable 603 line (ground wire) of (reference potential) respectively.

As described in so far, with reference to figs. 2 in the embodiment of 17, in 19 HDMI pins, SDA and SCL is used as the first differential pair, and CEC and reserved be used as second and one-way communication carried out to place to each and realize full-duplex communication.

But, by SDA and SCL, HIGH to be communicated at the Low ESR place for LOW in 1.5K Ω boosting place, and also by CEC, for HIGH 27 Ω boostings place and communicate at the Low ESR place for LOW.

Maintain these functions to have the compatibility with existing HDMI, this may cause following worry, becomes and is difficult to share the function that needs have the high-speed data communication LAN of the impedance matching at the clearing end place at transmission line.

Therefore, in the example of the first structure, avoid by using the differential pair of reserved and HPD using SDA, SCL and CEC line, thus realize full-duplex communication by a pair two-way communication.

Because HPD is the marking signal being in DC level place, therefore by AC coupling to the injection of lan signal and all satisfied to inserting the transmission of information at DC level place.Provide by using DC level to identify mutually the New function of the terminal with LAN function with the method being similar to HPD to this reserved (Reserved).

In the example of the second structure, by realizing two pairs of full-duplex communications at two differential pair HPD and SDA and SCL and reserved each place by one-way communication.

Under the state of reflector always main frame (master), the timing that the DDC controlling to be undertaken being similar to burst (burst) by SDA with SCL of HDMI communicates.

In this example embodiment, operation simulation switch is to make when reflector carries out DDC communication, and SDA and scl line are connected to DDC transceiver, and when reflector does not carry out DDC communication, these lines are connected to LAN transceiver.

These switch controlling signals are also sent to receiver with the DC level of reserved line, and also diverter switch on receiver-side.

Adopt these structures to provide the first advantage: SCL, SDA communicate not by the noise effect that LAN communicates with CEC, and always can set up stable DDC with CEC and communicate.

This is because in the example of the first structure, LAN physically separates with line, and in the example of the second structure, in DDC communication period, lan signal and line is disconnected by switch.

Second advantage is, because by using the line with desirable terminal to carry out LAN communication, can realize the stabilized communication with large surplus.

This is because, in the example of the first structure, in the enough wide frequency band needed for LAN communication, stop impedance and can be maintained at ideal value, wherein lan signal is added to and only sends on the reserved of signal and HPD line with DC level, and in the example of the second structure, only connected the LAN termination circuit not being allowed for DDC communication by switch in LAN communication period.

Figure 21 A to Figure 21 E is the figure of the two-way communication waveform illustrated in the communication system of the example of these structures.

Figure 21 A shows the signal waveform sent from EH sink device, and Figure 21 B shows the signal waveform received at EH sink device place, Figure 21 C shows the signal waveform passed through in the cable, Figure 21 D shows the signal received at EH source device place, and Figure 21 E shows the signal waveform sent from EH source device.

As shown in figure 21, good two-way communication can be realized by using the example of these structures.

(cable differentiation)

Next, the cable using description to insert district office be the HDMI cable of communication system for meeting LAN Function Extension HDMI (after this, be called new HDMI cable) still meet the embodiment of the HDMI cable (after this, being called existing HDMI cable) of existing HDMI standard.

(the first embodiment)

First, the first embodiment that cable is distinguished is described.

Figure 22 is the figure of the Circnit Layout that sink device in this embodiment and source device are shown.In the drawings, the following state shown: wherein, new HDMI cable and existing HDMI cable are inserted into and are meeting between the source device 401 (after this, being called expansion HDMI source device 401) of expansion HDMI and sink device 402 (expansion HDMI sink device 402).Figure 22 (A) shows the state wherein inserting new HDMI cable.Figure 22 (B) shows the state wherein inserting existing HDMI cable.

As shown in the figure, expand HDMI source device 401 and expand HDMI sink device 402 and there is connector 941 and 942 respectively, for connecting new HDMI cable 901 or existing HDMI cable 931.

The HPD holding wire 902 expanding HDMI sink device 402 and extension information source device 401 provides capacitor 905 (C1A) and 907 (C1B) respectively, and provide capacitor 906 (C2A) and 908 (C2B) respectively in expansion HDMI sink device 402 with the reserved line 903 of expansion HDMI source device 401.By these four capacitors, HPD holding wire 902 and reserved line 903 cut off (cutting) through DC, and become the signal that can send high frequency, such as 100Mbps, as the differential signal not having phase distortion, as shown in reference to Figure 18 etc.

In expansion HDMI sink device 402 lateral circuit, HPD holding wire 902 has the ballast resistor 911 (R1A) of 1k Ω between HPD holding wire 902 and voltage supply Vcc and the dropping resistor between HPD holding wire 902 and ground 913 (R1B).

Similarly, reserved line 903 in expansion HDMI sink device 402 lateral circuit, there is dropping resistor 914 (R2B) between reserved line 903 and ground, and in new HDMI cable 901, there is the ballast resistor (R2A) between the reserved line 903 and voltage supply Vcc of expansion HDMI source device 401.In new HDMI cable 901, connect ballast resistor 912 via such as little substrate.These four resistors 911 to 914 form termination circuit.

This embodiment illustrates the example that the cable carried out expansion HDMI sink device 402 side is distinguished, wherein compare expanding voltage and the reference voltage Vref of the test point 19 (TP_sink) on the reserved line 903 on HDMI sink device 402 side, to distinguish by voltage comparator 916 (IC1).

Because dropping resistor 913 arranges the voltage of HPD signal in the voltage range that can be confirmed as high level (in this example embodiment, approximately+4V), therefore dropping resistor 913 has the resistance value (4k Ω) determined by following formula.

Vcc*R1B/ (R1A+R1B)=4 [Volt], wherein Vcc=5V.

If above-mentioned expression formula is modified to R1B=4/ (Vcc-4) * R1A, then R1B=4 [k Ω].

0300 because the voltage of reserved line 903 be set to substantially with the identical voltage of HPD holding wire 902, therefore the resistance value R2B of dropping resistor 914 is identical with the resistance value R1B (4k Ω) of dropping resistor 913.

By arranging circuit constant as mentioned above, become+4V (Figure 22 (A)) when inserting new HDMI cable 901 at the TP_sink voltage at test point 919 place, and become 0V (Figure 23 (B)) when inserting existing HDMI cable 931.Therefore, when voltage comparator 916 comparison reference voltage Vref and TP_sink voltage, hypothetical reference voltage Vref is the median (+2V) between+4V and 0V, then the output of voltage comparator 916 is as follows.

If TP_sink > is Vref, Vo=is high

If TP_sink < is Vref, Vo=is low

If it is high for exporting Vo, then the CPU expanding HDMI sink device 402 determines the normal condition inserting new HDMI cable 901.On the contrary, if it is low for exporting Vo, then CPU inserts the abnormality of existing HDMI cable 931 with determining user error.

In this embodiment, because wide comparison surplus (0V is to 4V) can be designed at the relatively middle of voltage comparator 916, the error in cable is distinguished can therefore be avoided as much as possible.

In order to notify this differentiation result of user, " incorrect cable can be inserted " by using the additional firmware of CPU or software display alarm message on the screen of expansion HDMI source device 401 (such as television equipment).In this case, generate the vision signal comprising reminder message from CPU 302, and be presented on the display unit 307 shown in Figure 17.

It should be noted that except showing this reminder message, CPU 302 can from loud speaker 308 output class like content as audio message.In addition, by certain warning sound etc., CPU 302 can not also notify that the mistake of cable is inserted by audio message.

(the second embodiment)

Next, the second embodiment that cable is distinguished is described.In this embodiment, part has and those the similar structures in the first embodiment represented by same-sign or function, and omits or simplify its description.

Figure 23 is the figure of the Circnit Layout that sink device in this embodiment and source device are shown.Be similar to the first embodiment 1, Figure 23 (A) and show the state inserting new HDMI cable 901, and Figure 23 (B) shows the state wherein inserting existing HDMI cable 931.

This embodiment is following example: wherein, changes the configuration of ballast resistor 912 in a first embodiment and dropping resistor 913,914.That is, expansion HDMI sink device 402 side provides ballast resistor 912, and provide dropping resistor 913,914 in new HDMI cable 901.

The TP_sink voltage at test point 919 place is in this embodiment+4V when inserting new HDMI cable 901, and is+5V when inserting existing HDMI cable 931.Therefore, reference voltage Vref is set for+4.5V is as its median.

By said structure, the output voltage Vo of voltage comparator 916 is in this embodiment as follows.

If TP_sink > is Vref, Vo=is high

If TP_sink < is Vref, Vo=is low

In this embodiment, contrary with the first embodiment, the CPU of expansion HDMI sink device 402 determines when output Vo is low the normal condition inserting new HDMI cable 901, on the other hand, determines when output Vo is high the state inserting existing HDMI cable 931 mistakenly.

In this embodiment, the symmetric difference circuit with each resistor 911 to 914 can be designed.In other words, by making, the length of the holding wire in difference channel is equal aims at each resistor 911 to 914.Therefore, become and can send high-frequency signal and there is no phase distortion.

(the 3rd embodiment)

Next, the 3rd embodiment of cable differentiation will be described.In this embodiment, part has and those the similar structures in the first and second embodiments represented by same-sign or function, and omits or simplify its description.

Figure 24 is the figure of the Circnit Layout that sink device in this embodiment and source device are shown.Be similar to the first and second embodiments, Figure 24 (A) shows the state inserting new HDMI cable 901, and Figure 24 (B) shows the state wherein inserting existing HDMI cable 931.

In this embodiment, be different from the first and second embodiments, the HPD holding wire 902 in new HDMI cable 901 and provide resistor 915 (R3) between reserved line 903.Expansion HDMI sink device 402 side arranges ballast resistor 911,912 and dropping resistor 913,914.

In addition, in this embodiment, open collector transistor npn npn (open-collector type transistor) 917 (Q1) of control HPD holding wire 902 are connected to the HPD holding wire 902 in expansion HDMI sink device 402 lateral circuit.By judging each TP sink voltage at test point 919 place in the conduction and cut-off state of open collector transistor npn npn 917, carry out cable differentiation.When inserting cable and the+5V of cable detected between expansion HDMI source device 401 and expansion sink device 402 on expansion HDMI sink device 402 side, by CPU by the base stage of transistor 917 input (xHPD signal) from height be switched to low come "off" transistor 917, the voltage level of HPD holding wire 902 becomes high level (in this example embodiment ,+4V).

When using new HDMI cable 901, be following two patterns at the voltage TP_sink of the reserved line 903 at test point 919 place.

+ 4V this be voltage when Q1 ends by R2A and R2B dividing potential drop.

+ 2.2V this be voltage when Q1 conducting by R2A and (the parallel resistance value of R2B and R3) dividing potential drop.

On the other hand, when using existing HDMI cable 931, as follows at the voltage TP_sink of the reserved line 903 at test point 919 place.

All+4V when Q1 conduction and cut-off.

Therefore, if reference voltage Vref is set to the+3.1V as the median between+4V and+2.2V, then the output voltage Vo of voltage comparator 916 is as follows.

If TP_sink > is Vref, Vo=is high

If TP_sink < is Vref, Vo=is low

That is, when inserting new HDMI cable 901,

Vo=is high, when Q1 ends (xHPD is low)

Vo=is low, when Q1 conducting (xHPD is high),

And when inserting existing HDMI cable 931,

Vo=is high, always, no matter Q1 whether conduction and cut-off.

Therefore, in this embodiment, the normal condition supposing to insert new HDMI cable 901 is that Vo becomes height and Vo becomes low state when transistor 917 (Q1) conducting when transistor 917 (Q1) ends.On the other hand, if always export Vo high and no matter transistor 917Q1 be conduction and cut-off, then determine the state inserting existing HDMI cable 931 mistakenly.

Also in this embodiment, the symmetric difference circuit (termination circuit) with each resistor 911 to 914 can be designed, and therefore become and can send high-frequency signal and there is no phase distortion.

(other)

Should note, in the first to the three embodiment, show each configuration with two ballast resistor and two dropping resistors, but be wherein arranged to generate and equal the configuration of multiple resistors of the combined electrical resistance of the value be made up of single resistance value yes possible.

In addition, not only on expansion HDMI sink device 402 side, also, the voltage reserving line 903 can also be judged on expansion HDMI source device 401 side.In this case, the only voltage comparator 916 in each assembly can be provided on expansion HDMI source device 401 side, or the whole termination circuit comprising each resistor 911 to 914 can be provided on expansion HDMI source device 401 side.

In addition, in each example, by providing each resistor and voltage comparator to carry out cable differentiation on the difference twist paired signal line of HPD line 902 and preserved signal line 903.But particularly the second embodiment can be applied to the difference twist paired signal line of the difference twist paired signal line of the difference twist paired signal line of SDA line 191 as shown in Figure 7 and scl line 192 and the reserved line 801 shown in Figure 20 and scl line 803, SDA holding wire 804 and HPD line 802.In this case, the configuration of ballast resistor and dropping resistor can suitably be changed.

In the third embodiment, HPD line 902 is provided for the open collector transistor npn npn 917 (Q1) expanding HPD holding wire 902, but on the contrary, certainly can provides out drain type FET (field-effect transistor).

Accompanying drawing explanation

[Fig. 1] illustrates the figure of the structure of typical image transmission system.

[Fig. 2] illustrates the figure of the structure according to the image delivering system applying embodiments of the invention.

[Fig. 3] illustrates the figure of the example of the structure of HDMI (R) information source and HDMI (R) stay of two nights.

[Fig. 4] illustrates the figure of the distribution of the pin of the connector of the type-A of HDMI (R).

[Fig. 5] illustrates the figure of the distribution of the pin of the connector of the type-C of HDMI (R).

[Fig. 6] illustrates the figure of the more specifically example of the structure of HDMI (R) information source and HDMI (R) stay of two nights.

[Fig. 7] illustrates the figure of the more specifically example of another structure of HDMI (R) information source and HDMI (R) stay of two nights.

[Fig. 8] illustrates the figure of the data structure of E-EDID.

[Fig. 9] illustrates the figure of the data structure of vendor specific.

[Figure 10] illustrates the flow chart of the communication process of being undertaken by HDMI (R) information source.

[Figure 11] illustrates the flow chart of the communication process of being undertaken by HDMI (R) stay of two nights.

[Figure 12] illustrates the flow chart of the communication process of being undertaken by HDMI (R) information source.

[Figure 13] illustrates the flow chart of the communication process of being undertaken by HDMI (R) stay of two nights.

[Figure 14] illustrates the figure of the more specific example of another structure of HDMI (R) information source and HDMI (R) stay of two nights.

[Figure 15] illustrates the flow chart of the communication process of being undertaken by HDMI (R) information source.

[Figure 16] illustrates the flow chart of the communication process of being undertaken by HDMI (R) stay of two nights.

[Figure 17] diagram applies the block diagram of the example of the structure of the embodiment of computer of the present invention.

[Figure 18] shows wherein by the circuit diagram of the example of the first structure of the communication system of the connection status of at least one DC bias potential notification interface of transmission line.

[Figure 19] illustrates the figure of the example of the system used in Ethernet (registered trade mark).

[Figure 20] illustrates wherein by the circuit diagram of the example of the second structure of the communication system of the connection status of at least one DC bias potential notification interface of transmission line.

[Figure 21] illustrates the figure of the two-way communication waveform in the communication system of the example of the first and second structures.

[Figure 22] illustrates the figure of the Circnit Layout of sink device in the first embodiment of the present invention and source device.

[Figure 23] illustrates the figure of the Circnit Layout of sink device in the second embodiment of the present invention and source device.

[Figure 24] illustrates the figure of the Circnit Layout of sink device in the third embodiment of the present invention and source device.

Reference numeral

1TV, 2AV amplifier, 3 game devices, 4PC, 5 servers, 6 internets, 35HDMI (R) cable, 71HDMI (R) information source, 72HDMI (R) stay of two nights, 81 reflectors, 82 receivers, 83DDC, 84CEC line, 85EDIDROM, 121 switch control units, 124 switch control units, 131 converting units, 132 decoding units, 133 switches, 134 converting units, 135 switches, 136 decoding units, 141 holding wires, 171 switch control units, 172 switch control units, 181 switches, 182 switches, 183 decoding units, 184 converting units, 185 switches, 186 switches, 191SDA line, 192SCL line, 400 communication systems, 401LANd Function Extension HDMI (EH) source device 411LAN signal projector circuit, 412 termination resistor, 413, 414AC coupling circuit, 415LAN signal receiver circuit, 416 subtraction circuits, 421 ballast resistor, 422 resistors, 423 capacitors, 424 comparators, 431 dropping resistors, 432 resistors, 433 capacitors, 434 comparators, 402EH sink device, 441LAN signal projector circuit, 442 termination resistor, 443, 444AC coupling capacitor, 445LAN signal receiver circuit, 446 subtraction circuits, 451 dropping resistors, 452 resistors, 453 capacitors, 454 comparators, 461 choking-windings, 462, 463 resistors, 403EH cable, 501 reserved lines, 502HPD line, 511, 512 information source lateral terminals, 521, 522 stay of two nights lateral terminals, 600 communication systems, 601LAN Function Extension HDMI (EH) source device, 611LAN signal projector circuit, 612, 613 termination resistor, 614-617AC coupling capacitor, 618LAN signal receiver circuit, 620 reversers, 621 resistors, 622 resistors, 623 capacitors, 624 comparators, 631 dropping resistors, 632 resistors, 633 capacitors, 634 comparators, 640NOR door, 641-644 analog switch, 645 reversers, 646, 647 analog switches, 651, 652DDC transceiver, 653, 654 ballast resistor, 602EH sink device, 661LAN signal projector circuit, 662, 663 termination resistor, 664-667AC coupling capacitor, 668LAN signal receiver circuit, 671 dropping resistors, 672 resistors, 673 capacitors, 674 comparators, 681 choking-windings, 682, 683 resistors, 695 reversers, 696, 697 analog switches, 701, 702DDC transceiver, 703 ballast resistor, 603EH cable, 801 reserved lines, 802HPD line, 803SCL line, 804SDA line, 811-814 information source lateral terminal, 821-824 stay of two nights lateral terminal, 901 new HDMI cables, 931 existing HDMI cables, 902HPD line, 903 reserved lines, 905-908 capacitor, 911, 912 ballast resistor, 913, 914 dropping resistors, 915 resistors, 916 voltage comparators, 917 transistors, 941, 942 connectors

Claims (7)

1. an electronic installation, is characterized in that comprising:

Connector, can connect the first cable of the differential signal line being incorporated with and being made up of the first holding wire and secondary signal line and the resistor provided at least described secondary signal line respectively and be incorporated with described first holding wire and described secondary signal line the second cable as the holding wire separated;

Comparison means, compares the voltage at described secondary signal line place and preset reference voltage that detect via described connector; And

Discriminating device, for distinguishing described first cable based on the result of described comparison or described second cable is connected to described connector.

2. electronic installation according to claim 1, is characterized in that comprising further:

Described first holding wire and described secondary signal line each on capacitor that the first holding wire and secondary signal line are cut off through DC is provided.

3. electronic installation according to claim 1, is characterized in that,

Described resistor is the first ballast resistor provided on described secondary signal line, and

Described comparison means comprises

The second ballast resistor that described first holding wire provides and the first dropping resistor,

The second dropping resistor that described secondary signal line provides, and

Comparator, compares the voltage at described secondary signal line place and described reference voltage.

4. electronic installation according to claim 1, is characterized in that

Described resistor is made up of the first dropping resistor provided on described first holding wire and the second dropping resistor of providing on described secondary signal line, and

Described comparison means comprises

The first ballast resistor that described first holding wire provides,

The second ballast resistor that described secondary signal line provides, and

Comparator, compares the voltage at described secondary signal line place and described reference voltage.

5. electronic installation according to claim 1, is characterized in that

Described resistor is provided between described first holding wire and described secondary signal line, and

Described comparison means comprises

The first ballast resistor that described first holding wire provides and the first dropping resistor,

The second ballast resistor that described secondary signal line provides and the second dropping resistor,

The open collector transistor npn npn that described first holding wire provides, and

Comparator, compares the voltage at described secondary signal line place and described reference voltage.

6. electronic installation according to claim 1, characterized by further comprising:

Output device, for exporting the result of described differentiation.

7. a cable machinery, is characterized in that comprising:

Cable main, for being incorporated with the first cable of the differential signal line be made up of the first holding wire and secondary signal line and the resistor being connected at least described secondary signal line, or for being incorporated with described first holding wire and described secondary signal line the second cable as the holding wire separated;

The connector that the two ends of described cable main provide, in order to connect the first electronic installation and second electronic device; And

Described first holding wire and described secondary signal line each on capacitor that the first holding wire and secondary signal line are cut off through DC is provided;

Wherein, detect the voltage of secondary signal line via connector and compare with preset reference voltage, thus result differentiation cable main is the first cable or the second cable based on the comparison.