CN203788393U - Multipath expansion circuit and device based on HDMI signals and display system - Google Patents
Multipath expansion circuit and device based on HDMI signals and display system Download PDFInfo
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- CN203788393U CN203788393U CN201420214235.6U CN201420214235U CN203788393U CN 203788393 U CN203788393 U CN 203788393U CN 201420214235 U CN201420214235 U CN 201420214235U CN 203788393 U CN203788393 U CN 203788393U
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Abstract
The utility model discloses a multipath expansion circuit and device based on HDMI signals, and a display system. The multipath expansion circuit based on HDMI signals comprises an HDMI input interface, a HDMI high-speed signal separating chip, a multichannel gating chip, a master control chip, and a multipath HDMI output interface. The HDMI input interface is used for being connected with an external HDMI signal source, outputting HDMI signals to the HDMI high-speed signal separating chip, and performing control signal interaction by using the multichannel gating chip. The master control chip outputs an enable signal to the HDMI high-speed signal separating chip and the multichannel gating chip in order to form one or more high-definition data signals to be independently outputted by the HDMI input interface or synchronously outputted by the multipath HDMI output interface. The multipath expansion circuit based on HDMI signals performs multipath expansion on the HDMI signals so as to achieve support of synchronous display of multiple display devices for one HDMI signal source, satisfying diversified display requirements of users.
Description
Technical field
The utility model belongs to signal processing circuit technical field, specifically, relates to a kind of multichannel expanded circuit based on HDMI signal and the display system based on this signal expansion circuit design.
Background technology
HDMI(High Definition Multimedia Interface), it is HDMI (High Definition Multimedia Interface), it is a kind of digitized video/audio interface technology, it is the tailored version digital interface that is applicable to image transmission, can transmit audio frequency and signal of video signal, the maximum data transmission speed can reach 5Gbps simultaneously.Owing to thering is high message transmission rate, be therefore widely used at present in digital high-definition television product.
Along with the fast development of HDMI technology, except the digital TV in high resolution machine based on HDMI signal is popularized rapidly, industry has also occurred that the increasing high definition wear-type based on HDMI signal shows product, significantly strengthen the display effect of picture, can allow user experience at home just like the vision shock effect watching at movie theatre.
For current HDMI signal source, a road HDMI signal output interface is generally only provided, the high definition display device of therefore can only pegging graft, can only play the high-definition program from HDMI signal source by a display device at synchronization.This single Presentation Function, for the user who disposes digital TV in high resolution machine and high definition wear-type demonstration product in family simultaneously, can only select one to watch high-definition program at synchronization, when cannot realizing the two, play, thereby cannot meet the demand that in family, multi-user watches high-definition program simultaneously.
Summary of the invention
The purpose of this utility model is to provide a kind of multichannel expanded circuit based on HDMI signal, becomes multichannel for Jiang Yi road HDMI signal extension, realizes the support of road HDMI signal source to many display devices.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A multichannel expanded circuit based on HDMI signal, comprises a road HDMI input interface, HDMI high speed signal separating chips, multichannel gating chip, main control chip and multichannel HDMI output interface; Described HDMI input interface, for the HDMI signal source of pegging graft outside, comprises HDMI terminal for transmitting high resolution audio and video data and the control terminal for transmission of control signals; Described HDMI high speed signal separating chips, connect the HDMI terminal of HDMI input interface, and receive the enable signal of main control chip output, according to enable signal, the HDMI signal receiving is exported by a road HDMI output interface, or be extended to multichannel HDMI signal, by the corresponding output of multichannel HDMI output interface; Described multichannel gating chip, connect the control terminal of HDMI input interface, and receive the enable signal of main control chip output, according to described enable signal, the control terminal of HDMI input interface is communicated with the control terminal of a road or multichannel HDMI output interface wherein; Described main control chip, connects man-machine interface, operates to described HDMI high speed signal separating chips and described multichannel gating chip output enable signal according to user.
Further, in the control terminal of described HDMI input interface, be provided with I
2c bus terminal and hot plug detection terminal, connect respectively described multichannel gating chip, by multichannel gating chip and the wherein corresponding connection of corresponding controling end of a road or multichannel HDMI output interface, meet HDMI signal source and the control command transmission requirement between or many display devices wherein.
Preferably, be provided with button at described man-machine interface, described button connects main control chip by key circuit, generating run instruction, described main control chip according to described operational order to described HDMI high speed signal separating chips and described multichannel gating chip output enable signal.
Further, be also provided with indicator light at described man-machine interface, connect described main control chip, main control chip is controlled the flashing mode of indicator light according to the time length of described button closure, and then facilitates user to observe the mode of operation of current selection.
Show the reception requirement of product to HDMI signal in order to meet wear-type, in the described multichannel expanded circuit based on HDMI signal, be also provided with AV decoder, a wherein road HDMI signal of described HDMI high speed signal separating chips output transfers to a wherein road HDMI output interface via described AV decoder, shows product by the external wear-type of described HDMI output interface.
In order to simplify circuit structure, described AV decoder is preferably built in described main control chip, selects the main control chip that is integrated with AV decoder to carry out the global design of circuit system.
The utility model has also proposed a kind of multichannel expanding unit based on HDMI signal, comprises a road HDMI input interface, HDMI high speed signal separating chips, multichannel gating chip, main control chip and multichannel HDMI output interface; Described HDMI input interface, for the HDMI signal source of pegging graft outside, comprises HDMI terminal for transmitting high resolution audio and video data and the control terminal for transmission of control signals; Described HDMI high speed signal separating chips, connect the HDMI terminal of HDMI input interface, and receive the enable signal of main control chip output, according to enable signal, the HDMI signal receiving is exported by a road HDMI output interface, or be extended to multichannel HDMI signal, by the corresponding output of multichannel HDMI output interface; Described multichannel gating chip, connect the control terminal of HDMI input interface, and receive the enable signal of main control chip output, according to described enable signal, the control terminal of HDMI input interface is communicated with the control terminal of a road or multichannel HDMI output interface wherein; Described main control chip, connects man-machine interface, operates to described HDMI high speed signal separating chips and described multichannel gating chip output enable signal according to user.
Further, described device is also provided with shell, and described HDMI input interface, HDMI output interface, man-machine interface are laid on the housing of shell, and described HDMI high speed signal separating chips, multichannel gating chip, main control chip are built in shell; Wherein, described HDMI input interface and HDMI output interface preferably set up separately in the two opposite side surfaces of shell, to facilitate device and HDMI signal source and the different corresponding connections of display device.
Based on above-mentioned multichannel expanding unit, the utility model has also proposed a kind of display system, comprises at least one first kind display device, at least one Equations of The Second Kind display device and the multichannel expanding unit based on HDMI signal; In described multichannel expanding unit, be provided with a road HDMI input interface, HDMI high speed signal separating chips, multichannel gating chip, main control chip and multichannel HDMI output interface; Described HDMI input interface, for the HDMI signal source of pegging graft outside, comprises HDMI terminal for transmitting high resolution audio and video data and the control terminal for transmission of control signals; Described HDMI high speed signal separating chips, connect the HDMI terminal of HDMI input interface, and receive the enable signal of main control chip output, according to enable signal, the HDMI signal receiving is exported by a road HDMI output interface, or be extended to multichannel HDMI signal, by the corresponding output of multichannel HDMI output interface; Described multichannel gating chip, connect the control terminal of HDMI input interface, and receive the enable signal of main control chip output, according to described enable signal, the control terminal of HDMI input interface is communicated with the control terminal of a road or multichannel HDMI output interface wherein; Described main control chip, connects man-machine interface, operates to described HDMI high speed signal separating chips and described multichannel gating chip output enable signal according to user; Described first kind display device is connected respectively the different HDMI output interfaces on multichannel expanding unit with Equations of The Second Kind display device.
Preferably, be preferably provided with two-way HDMI output interface on described multichannel expanding unit, first via HDMI output interface connects HDMI high speed signal separating chips in succession at described multichannel expanding unit internal direct, for an external first kind display device; An other road HDMI output interface connects HDMI high speed signal separating chips in described multichannel expanding unit inside by AV decoder, for an external Equations of The Second Kind display device, to meet dissimilar display device, the difference of HDMI signal is received to broadcast request.
Compared with prior art, advantage of the present utility model and good effect are: the utility model provides Yi road HDMI signal to carry out multichannel expansion by Dui Yi road HDMI signal source, thereby can realize the support of road HDMI signal source to many high definition display device simultaneous displays, coordinated dissimilar display device, such as television set and wear-type show the together uses such as product, user can select by television for play high-definition digital program, or show product broadcasting high-definition digital program by wear-type, also or by television set and wear-type demonstration product synchronously play high-definition digital program, thereby meet the day by day diversified demonstration requirement of user.
Read by reference to the accompanying drawings after the detailed description of the utility model execution mode, other features of the present utility model and advantage will become clearer.
Brief description of the drawings
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the multichannel expanded circuit based on HDMI signal that proposes of the utility model;
Fig. 2 is the structural representation of a kind of embodiment of the multichannel expanding unit based on HDMI signal that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
The present embodiment is in order to reach the synchronous purpose of design of playing from the high-definition digital program of same road HDMI signal source of many display devices, based on HDMI Design of Signal a kind of multichannel expanded circuit, shown in Figure 1, mainly comprise a road HDMI input interface, HDMI high speed signal separating chips IC1, multichannel gating chip IC 2, main control chip IC3 and a multichannel HDMI output interface.Wherein, HDMI input interface is used for connecting HDMI signal source, receives the HDMI signal from the output of HDMI signal source, and transmits the control signal that between HDMI signal source and display device, signal post needs, such as bus signals or hot plug detection signal etc.In order to meet request signal transmission, in described HDMI input interface, be provided with HDMI terminal HDMI_IN for transmitting high resolution audio and video data and the control terminal I for transmission of control signals
2c & HPD_IN.Described HDMI terminal HDMI_IN connects the input IN of HDMI high speed signal separating chips IC1, the HDMI signal of HDMI signal source output is sent to HDMI high speed signal separating chips IC1, by HDMI high speed signal separating chips IC1, described HDMI signal is transferred to a wherein road HDMI output interface, or the described HDMI signal receiving is carried out after multichannel expansion, export respectively by multichannel HDMI output interface, to meet the broadcast request of many display device simultaneous display high-definition digital programs.
For the mode of operation of described HDMI high speed signal separating chips IC1 is carried out to corresponding control, on described HDMI high speed signal separating chips IC1, be provided with Enable Pin, describe as an example of two-way Enable Pin EN1, EN2 example, shown in Figure 1, respectively with two-way GPIO mouth GPIO1, the corresponding connection of GPIO2 of main control chip IC3, receive the enable signal of main control chip IC3 output, and then the HDMI signal providing by which HDMI output interface output HDMI signal source is provided.
Describe as example to be provided with two-way HDMI output interface, as shown in Figure 1, now can carry out reasonable disposition by the two-way Enable Pin EN1 to HDMI high speed signal separating chips IC1, the low and high level state of EN2, control HDMI high speed signal separating chips IC1 and realize four kinds of output modes.Specifically, in the time not needing HDMI high speed signal separating chips IC1 output HDMI signal, main control chip IC3 is by its GPIO1, GPIO2 output low level signal " 0 " respectively, correspondence transfers to two Enable Pin EN1, the EN2 of HDMI high speed signal separating chips IC1, controls HDMI high speed signal separating chips IC1 and stops exporting HDMI signal; In the time need to exporting HDMI signal HDMI_A by the first via output OUT_A of HDMI high speed signal separating chips IC1, main control chip IC3 is by its GPIO1 mouth output high level " 1 ", by its GPIO2 mouth output low level " 0 ", correspondence transfers to two Enable Pin EN1, the EN2 of HDMI high speed signal separating chips IC1, controls HDMI high speed signal separating chips IC1 output HDMI_A signal; In the time need to exporting HDMI signal HDMI_B by the second road output OUT_B of HDMI high speed signal separating chips IC1, main control chip IC3 is by its GPIO1 mouth output low level " 0 ", by its GPIO2 mouth output high level " 1 ", correspondence transfers to two Enable Pin EN1, the EN2 of HDMI high speed signal separating chips IC1, controls HDMI high speed signal separating chips IC1 output HDMI_B signal; In the time of needs HDMI high speed signal separating chips IC1 output two-way HDMI signal, main control chip IC3 exports respectively high level signal " 1 " by its GPIO1, GPIO2 mouth, correspondence transfers to two Enable Pin EN1, the EN2 of HDMI high speed signal separating chips IC1, control HDMI high speed signal separating chips IC1 will receive HDMI signal extension and become two-way HDMI_A, HDMI_B, respectively by its two-way output OUT_A, OUT_B output.Corresponding relation between the output mode of two-way enable signal and HDMI high speed signal separating chips IC1, can be referring to following truth table.
For the control terminal I for transmission of control signals in HDMI input interface
2c & HPD_IN, can be connected to the common port COM of multichannel gating chip IC 2, by Enable Pin EN1, the EN2 of described multichannel gating chip IC 2 also corresponding described two-way GPIO mouth GPIO1, the GPIO2 that is connected to main control chip IC3, receive the two-way enable signal of main control chip IC3 output, and then control its common port COM and be communicated with one of them or both in its gating end A, B, shown in Figure 1.Specifically, in the time that user does not need to watch the high-definition digital program of HDMI signal source, it is low level " 0 " that main control chip IC3 puts its two-way GPIO mouth GPIO1, GPIO2, multichannel gating chip IC 2, in the time detecting that its two-way Enable Pin EN1, EN2 are low level " 0 ", is controlled its common port COM and is not communicated with any road gating end A or B; In the time that user need to receive HDMI high-definition digital signal by first via HDMI output interface, it is high level " 1 " that main control chip IC3 puts its GPIO1 mouth, putting its GPIO2 mouth is low level " 0 ", thereby controlling multichannel gating chip IC 2 is communicated with its common port COM with its gating end A, transmission hot plug detection signal HPD and other control signals, described other control signals can be passed through I
2c bus is transmitted; In the time that user need to receive HDMI high-definition digital signal by the second road HDMI output interface, it is low level " 0 " that main control chip IC3 puts its GPIO1 mouth, putting its GPIO2 mouth is high level " 1 ", thereby control multichannel gating chip IC 2, its common port COM is communicated with its gating end B, meets HDMI signal source and be connected to the transmission requirement of the control signal between the display device on the second road HDMI output interface; In the time that user need to play the high-definition digital program providing from described HDMI signal source by two display devices simultaneously, main control chip IC3 puts its two-way GPIO mouth GPIO1, GPIO2 and is high level " 1 ", control multichannel gating chip IC 2 its common port COM is communicated with its two-way gating end A, B, to meet the control signal transmission requirement between HDMI signal source and two display devices.Corresponding relation between the passage gated mode of two-way enable signal and multichannel gating chip IC 2, can be referring to following truth table.
The gating end A of the output OUT_A of HDMI high speed signal separating chips IC1 and multichannel gating chip IC 2 is connected to respectively to first via HDMI output interface, includes the complete high-definition digital signal of HDMI signal and control signal with transmission of one line.In like manner, the gating end B of the output OUT_B of HDMI high speed signal separating chips IC1 and multichannel gating chip IC 2 is connected to respectively to the second road HDMI output interface, to transmit the complete high-definition digital signal in an other road.
Certainly, also can be by even HDMI signal more than three tunnels of HDMI high speed signal separating chips IC1 expansion output three tunnels, to meet more display devices synchronously or the demand of asynchronous play high-definition digital program.Now, only need combine configuration to the low and high level state of the Enable Pin of the more multichannel of HDMI high speed signal separating chips IC1, can meet design requirement.Or, can adopt the two-way HDMI signal HDMI_A to HDMI high speed signal separating chips IC1 output, the mode that HDMI_B carries out secondary expansion, form the more HDMI signal of multichannel.Specifically, can on the output OUT_A of HDMI high speed signal separating chips IC1, connect again a HDMI high speed signal separating chips, for the HDMI_A signal of OUT_A end output is carried out to secondary expansion, be divided into two-way; In like manner, also can on the output OUT_B of HDMI high speed signal separating chips IC1, connect again a HDMI high speed signal separating chips, the HDMI_B signal of holding output by OUT_B is divided into two-way, can expand thus and form four road HDMI signals.On this basis, in order to meet the control signal transmission requirement between HDMI signal source and four display devices, also need on two gating end A, B of multichannel gating chip IC 2, set up separately again a multichannel gating chip, for to two path control signal I
2c & HPD_A, I
2c & HPD_B carries out secondary expansion, forms four tunnel control signal transmission channels, meets the control signal transmission requirement of four display device Yu Yi road HDMI signal sources.
Certainly, also can adopt above-mentioned extended mode to carry out multi-tier, to form the more high-definition digital signal of multichannel, meet the designing requirement of more display device simultaneous display high-definition digital programs, the present embodiment is not limited in above giving an example.
For the enable signal of main control chip IC3 output, can generate according to the operational order of user's input is corresponding.Specifically, man-machine interface can be set in circuit system, connect described main control chip IC3, gather user's operational order, and transfer to described main control chip IC3, generate corresponding enable signal correspondence and export described high speed signal separating chips IC1 and multichannel gating chip IC 2 to control main control chip IC3.
As a kind of preferred design of the present embodiment, be preferably provided with button KEY at described man-machine interface, connect described main control chip IC3 by key circuit, user can carry out by operation push-button KEY the output mode of switched system circuit.In order to simplify circuit design, the present embodiment preferably arranges a button KEY and realizes the selection switching to multiple output mode.Specifically, provide pulse signal by triggering button KEY for main control chip IC3, by controlling the length of button KEY closing time, provide the pulse of different in width to main control chip IC3, main control chip IC3 is by detecting pulse duration, identify user's operation, control system switches to different output modes.
Clearly indicate for the button operation to user, the present embodiment is also provided with indicator light LED at described man-machine interface, shown in Figure 1, connects described main control chip IC3.Main control chip IC3 identifies the closing time length of button KEY by controlling the flicker number of times of LED.When after circuit system electrifying startup, first main control chip IC3 controls indicator light LED Chang Liang, enters acquiescence output mode.The present embodiment preferably sets acquiescence output mode and synchronously exports high-definition digital signal for controlling each road HDMI output interface, changes the output mode of system by closed button KEY.
For describe simple for the purpose of, the present embodiment only describes as example to be provided with two-way HDMI output interface below.
Output mode 1: in the time of the closed button KEY of user, indicator light LED starts flicker, if flicker once, unclamp button KEY, main control chip IC3 is by its two-way GPIO mouth GPIO1, GPIO2 output low level " 0 ", transfer to Enable Pin EN1, the EN2 of high speed signal separating chips IC1 and multichannel gating chip IC 2, two output OUT_A, OUT_B controlling high speed signal separating chips IC1 all do not export, and two gating end A, B of multichannel gating chip IC 2 are not all communicated with its common port COM.Now, all there is no signal output by two-way HDMI output interface, enter output mode 1.
Output mode 2: in the time of the closed button KEY of user, indicator light LED starts flicker, if flicker secondary, unclamp button KEY, main control chip IC3 is by its GPIO1 mouth output low level " 0 ", by its GPIO2 mouth output high level " 1 ", transfer to Enable Pin EN1, the EN2 of high speed signal separating chips IC1 and multichannel gating chip IC 2, the output OUT_B output, the OUT_A that control high speed signal separating chips IC1 do not export, and the common port COM that controls multichannel gating chip IC 2 is communicated with its gating end B.Now, first via HDMI output interface does not have signal output, only, by the second road HDMI output interface output high-definition digital signal, supports separate unit display device to play high-definition program, enters output mode 2.
Output mode 3: in the time of the closed button KEY of user, indicator light LED starts flicker, if glimmer three times, unclamp button KEY, main control chip IC3 is by its GPIO1 mouth output high level " 1 ", by its GPIO2 mouth output low level " 0 ", transfer to Enable Pin EN1, the EN2 of high speed signal separating chips IC1 and multichannel gating chip IC 2, the output OUT_A output, the OUT_B that control high speed signal separating chips IC1 do not export, and the common port COM that controls multichannel gating chip IC 2 is communicated with its gating end A.Now, only, by first via HDMI output interface output high-definition digital signal, support separate unit display device to play high-definition program, enter output mode 3.
Output mode 4: in the time of the closed button KEY of user, indicator light LED starts flicker, if glimmer four times, unclamp button KEY, main control chip IC3 is by its two-way GPIO mouth GPIO1, GPIO2 all exports high level " 1 ", transfer to the Enable Pin EN1 of high speed signal separating chips IC1 and multichannel gating chip IC 2, EN2, control high speed signal separating chips IC1 the HDMI signal extension of sending from HDMI signal source receiving is become to two-way HDMI_A, HDMI_B, by two output OUT_A, the corresponding output of OUT_B, and the common port COM that controls multichannel gating chip IC 2 respectively with two gating end A, B is communicated with.Now, can synchronously export high-definition digital signal by two-way HDMI output interface, support two display devices synchronously to play high-definition program, enter output mode 4.
Certainly,, for supporting the more circuit system of multichannel HDMI output interface, can copy above-mentioned processing mode to realize the switching controls of multi-output mode more.
For dissimilar display device, may need the slightly difference of form of the HDMI signal receiving, for example HDTV TV and wear-type show product.For HDTV TV, can directly receive the HDMI signal that signal source provides, display the play; And show product for wear-type, need the HDMI signal of signal source output to carry out after preliminary treatment, then transfer to wear-type and show that product carries out high definition demonstration.Therefore, for dissimilar display device, in the time of the described expanded circuit of design, first via HDMI output interface can be connected directly to a wherein road output of HDMI high speed signal separating chips IC1, for example OUT_A, and by the external for example HDTV of first via HDMI output interface TV such without HDMI signal being carried out to pretreated first kind display device; The second road HDMI output interface is connected to an other road output of HDMI high speed signal separating chips IC1 by AV decoder, for example OUT_B, after utilizing AV decoder that the HDMI signal of HDMI high speed signal separating chips IC1 output is changed and processed, generate the signal of the HDMI form that is applicable to the demonstration of Equations of The Second Kind display device, transfer to Equations of The Second Kind display device by the second road HDMI output interface again, such as wear-type shows product etc., shows the reception requirement of product to HDMI signal to meet such.
In the present embodiment, in order further to simplify the overall structure of circuit system, preferably described AV decoder is built in described main control chip IC3, select Soc (System-on-a-Chip) System on Chip/SoC that is integrated with AV decoder, processor and system management function as described main control chip IC3, carry out the global design of circuit system, connect described high speed signal separating chips IC1, in circuit system being coordinated to control, complete the preprocessing function to HDMI signal, shown in Figure 1.
On described Soc System on Chip/SoC, dispose HDMI input and output interface and I
2s interface, by described HDMI input and output interface transmission HDMI signal, by described I
2s interface transmission of audio signal.
The multichannel expanded circuit based on HDMI signal that the present embodiment is proposed is packaged in a shell 1, form a multichannel expanding unit based on HDMI signal, shown in Figure 2, for grafting HDMI signal source, realize the multichannel expansion to HDMI signal source output Yi road high-definition digital signal.
In order to facilitate described multichannel expanding unit to be plugged between HDMI signal source and many display devices, preferably HDMI input interface 2 and HDMI output interface 3,4 are laid on the housing of shell 1, and be positioned on two sides that housing is relative, as shown in Figure 2, to facilitate grafting HDMI data wire.Button KEY and indicator light LED are also laid on housing, are preferably placed at the end face of housing, to facilitate user to switch output mode.Described HDMI high speed signal separating chips IC1, multichannel gating chip IC 2 and main control chip IC3 are built in shell 1, utilize shell 1 to play a protective role to internal circuit.
First kind display device (with television set TV for example), Equations of The Second Kind display device (showing that with wear-type product is for example) and the multichannel expanding unit that the present embodiment was proposed of supporting high definition Presentation Function are combined, can form a set of display system.When use, the HDMI input interface of multichannel expanding unit can be plugged in HDMI signal source, television set TV is inserted on the first via HDMI output interface of multichannel expanding unit, wear-type is shown to product is inserted on the second road HDMI output interface of multichannel expanding unit.
In the time that user need to play from the high-definition digital program of HDMI signal source by television set TV, can closed button KEY, and the flicker number of times of viewing lamp LED, in the time of indicator light LED flicker three times, unclamp button KEY, control multichannel expanding unit and switch to output mode 3.Now, multichannel expanding unit only, by its first via HDMI output interface output high-definition digital signal, does not have signal output on the second road HDMI output interface.Therefore, user now can watch high-definition digital program by television set TV, and wear-type shows that product does not show.
In the time that user need to show that product is play from the high-definition digital program of HDMI signal source by wear-type, can closed button KEY, and the flicker number of times of viewing lamp LED, when indicator light LED glimmers twice time, unclamp button KEY, control multichannel expanding unit and switch to output mode 2.Now, multichannel expanding unit only, by its second road HDMI output interface output high-definition digital signal, does not have signal output on first via HDMI output interface.Therefore, user now can show that product watches high-definition digital program by wear-type, and television set TV does not show.
In the time that user need to show that product is play the high-definition digital program from HDMI signal source simultaneously by television set TV and wear-type, can closed button KEY, and the flicker number of times of viewing lamp LED, in the time of indicator light LED flicker four times, unclamp button KEY, control multichannel expanding unit and switch to output mode 4.Now, multichannel expanding unit is exported high-definition digital signal by its two-way HDMI output interface simultaneously, realizes television set TV and shows the synchronize broadcasting of product to high-definition digital program with wear-type.
As the closed button KEY of user, and in the time that indicator light LED flicker once unclamps button KEY, multichannel expanding unit switches to output mode 1.Now, on the two-way HDMI output interface of multichannel expanding unit, all without the output of high-definition digital signal, television set TV and wear-type show that product does not all show.
The utility model is by above-mentioned multichannel expanded circuit and the expanding unit based on HDMI signal of design, can allow user realize the single display of HDMI signal source or the simultaneous display of multiple devices by the time length of controlling button closure, meet well the diversified demonstration demand of different consumers.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also should belong to protection range of the present utility model.
Claims (10)
1. the multichannel expanded circuit based on HDMI signal, is characterized in that: comprise a road HDMI input interface, HDMI high speed signal separating chips, multichannel gating chip, main control chip and multichannel HDMI output interface;
Described HDMI input interface, for the HDMI signal source of pegging graft outside, comprises HDMI terminal for transmitting high resolution audio and video data and the control terminal for transmission of control signals;
Described HDMI high speed signal separating chips, connect the HDMI terminal of HDMI input interface, and receive the enable signal of main control chip output, according to enable signal, the HDMI signal receiving is exported by a road HDMI output interface, or be extended to multichannel HDMI signal, by the corresponding output of multichannel HDMI output interface;
Described multichannel gating chip, connect the control terminal of HDMI input interface, and receive the enable signal of main control chip output, according to described enable signal, the control terminal of HDMI input interface is communicated with the control terminal of a road or multichannel HDMI output interface wherein;
Described main control chip, connects man-machine interface, operates to described HDMI high speed signal separating chips and described multichannel gating chip output enable signal according to user.
2. the multichannel expanded circuit based on HDMI signal according to claim 1, is characterized in that: in the control terminal of described HDMI input interface, be provided with I
2c bus terminal and hot plug detection terminal, connect respectively described multichannel gating chip, by multichannel gating chip and the wherein corresponding connection of corresponding controling end of a road or multichannel HDMI output interface.
3. the multichannel expanded circuit based on HDMI signal according to claim 1, it is characterized in that: be provided with button at described man-machine interface, described button connects main control chip by key circuit, generating run instruction, described main control chip according to described operational order to described HDMI high speed signal separating chips and described multichannel gating chip output enable signal.
4. the multichannel expanded circuit based on HDMI signal according to claim 3, is characterized in that: be also provided with indicator light at described man-machine interface, connect described main control chip.
5. according to the multichannel expanded circuit based on HDMI signal described in any one in claim 1 to 4, it is characterized in that: also comprise AV decoder, a wherein road HDMI signal of described HDMI high speed signal separating chips output transfers to a wherein road HDMI output interface via described AV decoder.
6. the multichannel expanded circuit based on HDMI signal according to claim 5, is characterized in that: described AV decoder is built in described main control chip.
7. the multichannel expanding unit based on HDMI signal, is characterized in that: be provided with the multichannel expanded circuit based on HDMI signal as described in any one claim in claim 1 to 6.
8. the multichannel expanding unit based on HDMI signal according to claim 7, it is characterized in that: described device is also provided with shell, described HDMI input interface, HDMI output interface, man-machine interface are laid on the housing of shell, and described HDMI high speed signal separating chips, multichannel gating chip, main control chip are built in shell; Wherein, described HDMI input interface and HDMI output interface set up separately in the two opposite side surfaces of shell.
9. a display system, is characterized in that: comprise at least one first kind display device, at least one Equations of The Second Kind display device and the multichannel expanding unit based on HDMI signal as claimed in claim 7 or 8; Described first kind display device is connected respectively the different HDMI output interfaces on multichannel expanding unit with Equations of The Second Kind display device.
10. display system according to claim 9, it is characterized in that: on described multichannel expanding unit, be provided with two-way HDMI output interface, first via HDMI output interface connects HDMI high speed signal separating chips in succession at described multichannel expanding unit internal direct, for an external first kind display device; An other road HDMI output interface connects HDMI high speed signal separating chips in described multichannel expanding unit inside by AV decoder, for an external Equations of The Second Kind display device.
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| CN201420214235.6U CN203788393U (en) | 2014-04-29 | 2014-04-29 | Multipath expansion circuit and device based on HDMI signals and display system |
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| CN201420214235.6U CN203788393U (en) | 2014-04-29 | 2014-04-29 | Multipath expansion circuit and device based on HDMI signals and display system |
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| CN203788393U true CN203788393U (en) | 2014-08-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104243853A (en) * | 2014-08-25 | 2014-12-24 | 青岛歌尔声学科技有限公司 | High-definition multimedia interface (HDMI) double-display device and display method |
| CN104506903A (en) * | 2014-12-10 | 2015-04-08 | 青岛歌尔声学科技有限公司 | Audio/video output processing device, method and head-mounted type display device |
| CN106339037A (en) * | 2016-08-30 | 2017-01-18 | 南京巨鲨显示科技有限公司 | Display device with multi-channel switching USB (Universal Serial Bus) hub |
| CN106851165A (en) * | 2017-03-28 | 2017-06-13 | 歌尔科技有限公司 | A kind of HDMI signal expansion circuits, extended method and VR products |
| CN113473054A (en) * | 2021-06-07 | 2021-10-01 | 惠州市特创电子科技股份有限公司 | Wireless HDMI transmission system based on domestic high definition display device |
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2014
- 2014-04-29 CN CN201420214235.6U patent/CN203788393U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243853A (en) * | 2014-08-25 | 2014-12-24 | 青岛歌尔声学科技有限公司 | High-definition multimedia interface (HDMI) double-display device and display method |
| CN104506903A (en) * | 2014-12-10 | 2015-04-08 | 青岛歌尔声学科技有限公司 | Audio/video output processing device, method and head-mounted type display device |
| CN106339037A (en) * | 2016-08-30 | 2017-01-18 | 南京巨鲨显示科技有限公司 | Display device with multi-channel switching USB (Universal Serial Bus) hub |
| CN106851165A (en) * | 2017-03-28 | 2017-06-13 | 歌尔科技有限公司 | A kind of HDMI signal expansion circuits, extended method and VR products |
| CN106851165B (en) * | 2017-03-28 | 2023-10-13 | 歌尔科技有限公司 | HDMI signal expansion circuit, expansion method and VR product |
| CN113473054A (en) * | 2021-06-07 | 2021-10-01 | 惠州市特创电子科技股份有限公司 | Wireless HDMI transmission system based on domestic high definition display device |
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