WO2012097615A2 - 将耳机接口复用为高清视音频接口的多用途连接器及手持电子设备 - Google Patents
将耳机接口复用为高清视音频接口的多用途连接器及手持电子设备 Download PDFInfo
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- WO2012097615A2 WO2012097615A2 PCT/CN2011/081069 CN2011081069W WO2012097615A2 WO 2012097615 A2 WO2012097615 A2 WO 2012097615A2 CN 2011081069 W CN2011081069 W CN 2011081069W WO 2012097615 A2 WO2012097615 A2 WO 2012097615A2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0274—Details of the structure or mounting of specific components for an electrical connector module
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
- H04M1/6041—Portable telephones adapted for handsfree use
- H04M1/6058—Portable telephones adapted for handsfree use involving the use of a headset accessory device connected to the portable telephone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/05—Detection of connection of loudspeakers or headphones to amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/09—Applications of special connectors, e.g. USB, XLR, in loudspeakers, microphones or headphones
Definitions
- Multi-purpose connector and handheld electronic device that multiplex the headphone interface into a high-definition video and audio interface
- the present invention relates to the field of communication technologies, and in particular, to a method, apparatus and system for quality of service configuration.
- the High Definition Multimedia Interface is an interface for transmitting uncompressed digital HD video/audio. It is forward and backward compatible with the Digital Video Interface (DVI). DVI only transmits video data, while HDMI inserts multi-channel audio data and status data in the gap of DVI video data bursts.
- HDMI uses Transition Minimized Differential Signaling (TMDS) technology.
- TMDS technology is a technology that uses a voltage difference between two pins to transmit signals (ie, differential transmission).
- the TMDS has 4 channels, and the first 3 cables are YU (Pb) V ( Pr ) transmission lines, or For the RGB transmission line, the fourth is the Clock, to ensure the uniform timing required for transmission, which is collectively referred to as a connection or Single-link.
- the maximum transmission speed of each channel is 165MHz (4.95 Gb/s), and one connection has a transmission speed of 5Gbps.
- the original data after MDS decoding is encrypted by High Definition Content Protection (HDCP). And use 8b/10b differential signal to reduce EMI and improve precision
- the exact signal transmission rate converts the 8-bit input signal into a 10-bit code.
- the connector of the HDMI interface has three physical specifications, which are called Type A, Type B, and Type C.
- Type A consists of 19 pins. The definition of each pin is shown in Figure 1. It can be seen that there are 6 pins for transmitting TMDS data. These 6 pins are respectively connected to 3 pairs of differential transmission lines (Differential Transmission Line), and 2 pins are used to transmit TMDS clock signals.
- Type A socket has a maximum width of 14mm and a height of 4.55mm.
- Type B has 29 pins and is large in size.
- Type C has the same 19 pins as Type A, differing only in size, and its socket size is 10.5mmx2.5mm. Suitable for handheld mobile devices. However, Type C has 19 pins arranged in a small size, which greatly improves the precision of interface manufacturing, increases manufacturing costs, and dense wiring also reduces the reliability of the interface. In fact, Type C HDMI The number of pluggable connectors is much lower than other connectors of similar size, such as the Micro Universal USB (Micro USB) connector.
- Micro Universal USB Micro Universal USB
- the handheld electronic device itself is small in size, and the increased interface takes up space on the one hand, and increases manufacturing costs on the one hand.
- the technical problem to be solved by the present invention is how to realize a higher-definition video interface of a d-size on a handheld electronic device, while at the same time not increasing the number of interfaces of the handheld electronic device.
- One embodiment of the present invention provides a multi-purpose connector for multiplexing a headphone interface into a high definition video/audio input interface, including:
- a headphone connector includes a selection switch, a high definition video/audio transceiver, an audio output module, wherein the earphone connector includes a first audio terminal and a second audio terminal;
- the audio output module is configured to output a headphone audio signal
- the selection switch includes two paths. When the selection switch is connected to the first path, the first audio terminal and the second audio terminal are respectively coupled to a pair of differential transmission lines, and the differential transmission line is used. Transmitting high-definition video/audio data output by the high-definition video/audio transceiver; when the selection switch is connected to the second path, the first audio terminal and the audio output module are coupled.
- Another embodiment of the present invention provides a handheld electronic device, including:
- the multipurpose connector including a headphone connector, a selection switch, a high definition video/audio transceiver, and an audio output module, wherein
- the earphone connector includes a first audio terminal, a second audio terminal, and a ground terminal;
- the audio output module is configured to output a headphone audio signal
- the selection switch includes two paths. When the selection switch is connected to the first path, the first audio terminal and the second audio terminal are respectively coupled to a pair of differential transmission lines, and the differential transmission line is used to transmit the high-definition video. High-definition video/audio data output by the audio transceiver; when the selection switch is connected to the second path, the first audio terminal and the audio output module are coupled;
- the main control unit is coupled to the high definition video/audio transceiver and the audio output module, respectively.
- the multi-purpose connector and the handheld electronic device provided by the embodiments of the present invention can make the earphone interface be multiplexed into a high-definition video/audio interface, and can transmit high-definition video/audio. Due to the small size of the headphone connector and the availability of virtually all handheld electronic devices, the high-definition video/audio interface is implemented on the smaller volume of the handheld electronic device without increasing the number of interfaces on the handheld electronic device.
- Figure 1 is a schematic diagram of each pin of the HDMI socket;
- 2A is a schematic structural view of a conventional 4-core earphone jack;
- 2B is a schematic structural view of an MHL socket
- FIG. 3 is a schematic structural diagram of a connector according to an embodiment of the present invention.
- FIG. 4 is a schematic structural diagram of a connector according to another embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of a connector according to another embodiment of the present invention.
- FIG. 6 is a schematic diagram of the MHL device discovery
- FIG. 7 is a circuit schematic diagram of a method for detecting insertion of a headphone jack
- FIG. 8 is a circuit schematic diagram of a method for detecting a type of earphone
- FIG. 9 is a schematic circuit diagram of implementing selection switch switching according to an embodiment of the present invention.
- FIG. 10 is a schematic circuit diagram of implementing selection switch switching according to another embodiment of the present invention.
- FIG. 11 is a schematic structural view of a connector for controlling selection switch switching by a physical switch according to an embodiment of the present invention
- FIG. 12 is a schematic structural diagram of a handheld electronic device according to an embodiment of the present invention.
- the so-called “handheld electronic device” refers to various electronic devices whose size is suitable for handheld, including but not limited to: mobile phones, personal digital assistants (PDAs), tablet PCs, digital cameras, digital video cameras. , MP3/MP4 player.
- PDAs personal digital assistants
- tablet PCs digital cameras
- digital video cameras digital video cameras.
- MP3/MP4 player MP3/MP4 player.
- connector is meant a component that connects two devices, typically including a socket or plug, and may also include an interface device coupled to the socket or plug.
- the connector can be a discrete component or integrated into a handheld electronic device.
- the electrical signal passing through ⁇ is physically determined to be related to the electrical signal passing through B.
- This includes direct connection between ⁇ and B through wires, or through another A component C is indirectly connected, and also includes electricity between the ⁇ and B, such as a transformer. Magnetic induction correlates with the respective electrical signals.
- FIG. 2A is a schematic illustration of a prior art earphone connector.
- Today's common headphones have so-called 3-core headphones and 4-core headphones.
- 2A shows a typical 4-core headphone jack that includes four terminals, wherein the first audio terminal 301 is coupled to the first channel output of the handheld electronic device, and the second audio terminal 302 is coupled to the handheld electronic device. The second channel output is coupled, the third audio terminal 303 is coupled to the microphone input of the handheld electronic device, and a ground terminal 304 is coupled to ground.
- the traditional HDMI requires three pairs of differential transmission lines to transmit high-definition video data, and the headphone interface is difficult to meet the requirements of so many transmission channels.
- MHL Mobile High Definition Link
- FIG. 2B is a schematic diagram of the MHL interface. It can be seen that the MHL interface generally uses 5 pins, one of which is connected to the power line (VBUS), two is connected to the differential transmission line (TMDS+, TMDS-), one is connected to the control bus (CBUS), and one is grounded (GND).
- the differential transmission line is used to transmit high-definition video/audio data
- the power line is used to supply power to the device where the MHL interface is located.
- the control bus is used to transmit some control signals.
- a multi-purpose connector for multiplexing a headphone interface into a high definition video/audio input interface includes: a headphone connector, a selection switch, a high definition video/audio transceiver, an audio output module, wherein the earphone connection
- the device includes a first audio terminal, a second audio terminal, and optionally a ground terminal.
- the audio output module is configured to output a headphone audio signal.
- the selection switch includes two paths.
- the first audio terminal and the second audio terminal are respectively coupled to a pair of differential transmission lines, and the differential transmission line is used to transmit the HD video/ HD video/audio data output by the audio transceiver; when the selection switch is connected to the second path
- the first audio terminal and the audio output module are coupled.
- the first audio terminal is coupled to the first channel output end of the audio output module, and the second audio terminal and the audio output module are The second channel output is coupled.
- the connector further includes an audio input module for receiving a microphone input signal.
- the earphone connector further includes a third audio terminal, wherein the third audio terminal is coupled to a control bus of the high definition video/audio transceiver when the selection switch is connected to the first path, and is connected to the second selection switch In the case of a road, it is coupled to the input of the audio input module.
- the first audio terminal is a first channel terminal in a conventional earphone connector
- the second audio terminal is a second channel terminal in a conventional earphone connector
- the three audio terminals are microphone terminals in a conventional earphone connector; and in other embodiments of the present invention, the first audio terminal is a first channel terminal in a conventional earphone connector, and the second audio terminal is A microphone terminal in a conventional earphone connector, the third audio terminal being a second channel terminal in a conventional earphone connector.
- the first channel and the second channel are two different channels of the audio output of the handheld electronic device, which may be the left channel and the right channel, respectively, or may be the normal channel and the bass channel, respectively. This is not limited.
- the connector further includes a connection detection module for detecting whether the connector is connected to other devices.
- the connection detecting module is coupled to the main control unit of the handheld electronic device, and when the connection detecting module detects that the connector is connected to other devices, the main control unit executes a program to prompt the handheld electronic device.
- the user selects a high definition video/audio connection or a headphone connection, and controls the selection switch to switch between the first path and the second path according to a selection instruction input by the user.
- the connector further includes a device type detection module for detecting a type of device connected to the connector.
- a device type detection module for detecting a type of device connected to the connector.
- the device type detecting module detects that the connected device is a high-definition video/audio receiving device, outputs a first detection signal to the main control unit, and the main control unit controls the selection according to the first detection signal.
- the switch is connected to the first path; when the device type detecting module detects that the connected device is a headset, outputs a second detection signal to the main control unit, and the main control unit controls the selection according to the second detection signal
- the switch is connected to the second path.
- Figure 3 is a block diagram showing the construction of an embodiment of the connector of the present invention.
- the earphone connector 300 includes four terminals: a first channel terminal 301, a second channel terminal 302, a microphone terminal 303, and a ground terminal 304.
- the first channel terminal 301 and the second channel terminal 302 are respectively connected to the channel and the right channel, and the microphone terminal is used for connecting the microphone and inputting the audio signal generated by the microphone.
- the MHL transceiver 320 is an element for transmitting and receiving MHL high definition video/audio data. Usually, it may be a chip such as a SiI9232, SiI9236, and SH9244 series chips, but the embodiment of the present invention is not limited thereto.
- the MHL transceiver 320 converts HD video/audio data into MHL format and transmits the above HD video/audio data over a pair of differential transmission lines (TMDS+, TMDS-).
- the selection switch 310 is an electronic switch or a mechanical switch having two paths.
- the differential transmission lines (TMDS+, TMDS-) are respectively connected to the first channel terminal 301 and the second channel.
- the terminal 302 is coupled; when the selection switch 310 is connected to the second path, the first channel terminal 301 and the second channel terminal 302 are coupled to the left channel output line and the right channel output line, respectively.
- the first channel terminal 301 may be coupled to the left channel output line
- the second channel terminal 302 may be coupled to the right channel output line; or the first channel terminal 301 may be coupled to the right channel output line
- the second channel terminal 302 is coupled to the left channel output line.
- the left channel output line and the right channel output line are coupled to an audio output module 330.
- the audio output module 330 is a module for outputting a headphone audio signal.
- the module includes a digital-to-analog converter (A/D Converter) that converts the digital audio signal received by the audio output module 330 into an analog signal so that the audio can be output through the headphone jack.
- the audio output module 330 further includes a power amplifier (PA) coupled to the output of the digital to analog converter to amplify the analog signal.
- PA power amplifier
- the audio output module 330 can output multi-channel audio, and the audio signal of each channel corresponds to one output line.
- the headphone jack can be multiplexed into a high definition video/audio interface for transmitting high definition video/audio. Due to the small size of the headphone jack and the availability of virtually all handheld electronic devices, high-definition video/audio interfaces are realized on the smaller size of the handheld electronic device without increasing the number of interfaces on the handheld electronic device.
- FIG. 4 is a schematic illustration of another embodiment of the connector of the present invention.
- the microphone terminal of the earphone connector is coupled with the MHL control bus (CBUS); when the selection switch 310 is connected to the second path, The ear The microphone terminal of the machine connector is coupled to a microphone input line that is coupled to the audio input module 340.
- CBUS MHL control bus
- the audio input module 340 is a module for receiving a microphone input signal.
- the module includes an analog to digital converter (D / A Converter) that allows the handheld electronic device to process the audio input from the microphone by converting the analog signal from the microphone to a digital audio signal.
- the audio input module 340 further includes a power amplifier (PA) coupled to the input of the analog to digital converter to amplify the analog signal.
- PA power amplifier
- the selection switch 310 communicates with the aforementioned first circuit in a default state, that is, the differential transmission lines (TMDS+, TMDS-) and the first channel terminal 301 and the second channel terminal 302, respectively.
- the selection switch 310 communicates with the second path in a default state, that is, the first channel terminal 301 and the second channel terminal 302 are respectively connected to the left channel output line and the right channel. The channel output lines are coupled.
- the switching of the selection switch 310 can be triggered by:
- a physical switch 315 can be provided on the handheld electronic device that can control the selector switch 310 to switch between the first and second paths. As is known to those skilled in the art, the physical switch 315 can control the switching of the selector switch 310 by mechanical or electronic means.
- the earphone connector on the handheld electronic device generally has the function of insertion detection, that is, when a plug is inserted into the earphone connector, a signal can be transmitted to the main control unit of the handheld electronic device (for example, the central processing unit CPU, the baseband chip, A graphics processor, etc., so that the main control unit knows that a plug is inserted.
- the main control unit of the handheld electronic device for example, the central processing unit CPU, the baseband chip, A graphics processor, etc.
- an insertion detecting module may be provided for outputting an insertion detection signal when a plug is inserted into the earphone connector, and an output end of the module is coupled to the main control unit.
- the main control unit executes a program prompting the user of the handheld electronic device to select the headphone output or the high definition video/audio connection.
- the user can input a selection command through an input device of the handheld electronic device, such as a button or a touch screen, and select a headphone output or a high definition video/audio connection.
- the main control unit controls the selection switch 310 to switch between the first path and the second path according to the selection instruction.
- the selection switch 310 can have a control signal input terminal, The switch 310 switches between the first path and the second path according to a control signal input from the input terminal.
- the main control unit is coupled to the input, and sends a control letter to the input.
- An identification circuit can be designed for identifying the type of device inserted into the earphone connector, thereby controlling the switching of the selection unit 310. The above second and third modes will be described in detail below.
- this is a circuit diagram of a circuit for insert detection of a headphone connector.
- the earphone plug has been added for a while.
- This section has a special earphone insertion terminal PLUGIN.
- pin 5 on the earphone socket J1 of the electronic device becomes the earphone insertion pin: PLUGIN, and the pin 5 and pin 6 are added.
- a reed is used to detect if the headphone plug PLUGIN is inserted into Jl.
- pin 5 of J1 is externally connected to a high level through resistor R47: 3.0V.
- resistor R47: 3.0V resistor
- the specific working principle is as follows: When PLUGIN on the headphone plug is not inserted between pins 5 and 6 of J1, the CHECK signal is grounded. When the PLUGIN of the headphone plug is inserted between pins 5 and 6 of J1, the pin 6 of J1 pops open. Since the high-potential pull-up of the CHECK signal is caused by the high voltage of 3.0V through the resistor R47, the CHECK signal behaves as logic high. Level. Therefore, when the CHECK signal changes from logic low to logic high, the electronics assumes that the headset is plugged in. In actual applications, depending on the specific circuit design, when the headphone plug is inserted into J1, the CHECK signal may also change from logic high level to logic low level.
- the earphone connector 300 further includes an insertion detecting pin 305 which is overlapped on the ground terminal 304 when the plug is not inserted into the earphone connector 300, and when there is When the plug is inserted, it is disconnected from the ground terminal.
- This can be achieved by designing the bar insertion detection pin 305 as a shrapnel. When no plug is inserted, the pin is pressed against the ground terminal 304, and when the plug is inserted, the pin is pushed up by the plug to be disengaged from the ground terminal 304.
- the above connection state of the insertion detecting pin 305 can also be realized by other means.
- the insertion detection pin I 305 is optionally coupled to a resistor R1 to which a bias voltage V_CHECK is applied, and the insertion detection pin 305 is also coupled to the input of the detection signal output module 350.
- the detection signal output module 350 Ground, so the module detects a potential of approximately 0V, and when the insertion detection pin 305 is disconnected from the ground terminal, the detection signal output module 350 is connected to the bias voltage V_CHECK through the resistor R1, usually the bias voltage V_CHECK will It is much higher than the ground potential (0V), for example, 3V, at which time the detection signal output module 350 can detect a significant potential change.
- the bias voltage V_CHECK can also be lower than the ground potential, for example, -3V.
- the detection signal output module 350 is for outputting an insertion detection signal to the main control unit 360.
- the module can be a single transistor that buffers the sense signal and provides the necessary level shifting to interface with the controller.
- the module can also be a comparator, such as the MAX9060 series comparator, which outputs a corresponding detection signal by comparing the detected potential to a reference potential. For example, when the detected potential is lower than the reference potential, it outputs a low level, and on the other hand, it outputs a high level.
- the detection signal output module outputs an insertion detection signal when the absolute value of the difference between the first potential and the first bias voltage is less than or equal to the first threshold, and the first potential is the detection signal.
- the potential of the input terminal of the output module and the coupling point of the insertion detection pin is for outputting an insertion detection signal to the main control unit 360.
- the output of the sense signal output module 350 is coupled to the master unit 360.
- an input/output interface (I/O Interface) module can be disposed between the detection signal output module 350 and the main control unit 360, and the insertion detection signal outputted by the detection signal output module 350 is converted into a master control.
- Unit 360 interrupts the signal of an I/O interface, thereby generating an interrupt at the master unit 360.
- the main control unit 360 can execute a program to prompt the user to select the high definition video/audio output or the headphone output through the output device 370.
- the output device 370 can be a screen, such as displaying a dialog box on the screen for the user to select; or a speaker, prompting with a voice. The embodiment of the invention does not limit this.
- the input device 380 can be a touch screen, a button, or a voice input device, and the like.
- An input of the output device 370 is coupled to the main control unit, and an output of the input device 380 is coupled to the main control unit 360. It will be understood by those skilled in the art that between the input of the output device 370 and the main control unit 360, and/or between the output of the input device 380 and the main control unit 360, An I/O interface module is generally provided for converting the data output by the main control unit 360 into a signal recognizable by the output device 370, or converting the input signal generated by the input device 380 into an I/O interface of the main control unit 360. Interrupt signal.
- the main control unit 360 Upon receiving the input signal generated by the input device 380, the main control unit 360 outputs a control signal to the selection switch 310 according to the input signal, and controls the selection switch 310 to switch.
- FIG. 6 is a schematic diagram of the MHL device discovery.
- the switch SW3 is closed, that is, at the MHL receiving end, a resistor Rd is connected in series between the control bus CBUS and the ground.
- the value of Rd is lkQ, in general, The value of Rd is between 800 ⁇ and 1200 ⁇ .
- the MHL source device first detects the impedance on the CBUS line. If the impedance is found to be between 800 ⁇ and 1200 ⁇ , the MHL source device will consider it possible to connect. On the MHL receiving device.
- the MHL source device will detect if there is input in VBUS shown in Figure 2 ⁇ , if there is input, start the device discovery process; or if it does not detect VBUS input for a period of time, the device discovery process will start.
- the MHL source device sends a series of Wake up and Discovery pulses through the CBUS. After receiving the pulse, the MHL receiving device will judge that it is connected to the MHL source device.
- Switch SW4 open switch SW3, because the resistance connected to ground on CBUS becomes lOOkQ, CBUS becomes high.
- the MHL source device detects a high level, it can be determined that the MHL receiving device is connected. At this time, the switch SW1 is turned on, the switch SW2 is turned off, and the MHL device discovery process is continued until the discovery process ends.
- the start of the discovery process depends on the impedance measurement on the CBUS line, and triggers the MHL device discovery process when the impedance falls between 800 ⁇ and 1200 ⁇ .
- the impedance of the multi-microphone now falls within this range. Therefore, if the CBUS and the microphone share one terminal, it may cause a false positive.
- the impedance of the headphones is generally very small, usually in the tens of ohms or even a few ohms, so if you let the CBUS and headphones universal terminals, you can avoid misjudgment. That is, the connector may be as shown in FIG. 5.
- the first channel terminal 301 and the microphone terminal 303 are coupled to the differential transmission line, and the second channel terminal 302 and the control The bus CBUS is coupled; when the selection switch is connected to the second path, the first channel terminal 301 and the second channel terminal 302 are coupled to the left channel and the right channel, respectively, and the microphone terminal 303 is coupled to the microphone input.
- the second channel terminal 302 when the selection switch 310 is connected to the first path, the second channel terminal 302 is coupled to the MHL control bus (CBUS), and when the selection switch 310 is connected to the second In the case of the road, the second channel terminal 302 is coupled to the output of the right channel (which may also be the left channel).
- the second channel terminal 302 is also coupled to a resistor R2, and a bias voltage ⁇ _ is applied to the resistor R2 (the value of R2 is usually large, for example, several thousand ohms.
- the second channel terminal is simultaneously detected
- the signal output module 350 is coupled.
- the detection signal output module 350 can detect that the potential of the second channel terminal 302 is low (usually close to 0V).
- the value of R2 is small, for example only a few ohms, in which case, when MHL receiving When the end device is connected to the earphone connector 300, since the second channel terminal is connected to the CBUS of the MHL receiving device at this time, since the MHL receiving device has a resistance of 800 ⁇ to 1200 ⁇ connected between the CBUS and the ground, the detection is performed at this time.
- the signal output module 350 can detect that the potential of the second channel terminal 302 is high, usually connected to the V ⁇ CHECK.
- the detection signal output module 350 can be It is detected that the potential of the second channel terminal 302 is low, for example, only half of V_CHECK.
- the detection signal output module 350 is for outputting an insertion detection signal to the main control unit 360.
- the module can be a single transistor that buffers the sense signal and provides the necessary level shifting to interface with the controller.
- the module can also be a comparator, such as the MAX9060 series comparator, which outputs a corresponding detection signal by comparing the detected potential to a reference potential. For example, when the detected potential is lower than the reference potential, it outputs a low level, and on the other hand, it outputs a high level.
- the detection signal output module 350 is configured to output a video detection signal when the impedance on the second audio terminal is the first impedance, and output when the impedance on the second audio terminal is the second impedance Headphone detection signal.
- the video detection signal indicates that the connected device is a high definition video/audio device
- the earphone detection signal indicates that the earphone or other audio output device is connected. (eg speaker).
- a second bias voltage is applied to the second audio terminal, a first resistor is connected in series between the second bias voltage and the second coupling point, and the second coupling point is the detection signal.
- the detection signal module is specifically configured to output when an absolute value of a difference between the second potential and the second bias voltage is less than or equal to a third threshold a first detection signal, when the absolute value of the difference between the second potential and the second bias voltage is greater than the third threshold, outputting a second detection signal, or the detection signal module is specifically used for Outputting a first path detection signal when a difference value of a difference between the second potential and the second bias voltage is less than or equal to a third threshold, and a difference between the second potential and the second bias voltage
- the second path detection signal is output when the absolute value is greater than the third threshold; the second potential is the potential of the second coupling point.
- the output of the detection signal output module 350 is coupled to the main control unit 360.
- an input/output interface (I/O Interface) module can be disposed between the detection signal output module 350 and the main control unit 360, and the insertion detection signal outputted by the detection signal output module 350 is converted into a master control.
- Unit 360 interrupts the signal of an I/O interface, thereby generating an interrupt at the master unit 360.
- the main control unit 360 After receiving the detection signal output by the detection signal output module, the main control unit 360 generates a control signal to control the selection switch 310 to switch. For example, when the detection signal indicates that the earphone connector is connected to the MHL receiving device, the control selection switch 310 is connected to the first path; when the detection signal indicates that the earphone connector is connected to the earphone, the control selection switch 310 is connected to the second path.
- first channel terminal, the second channel terminal, and the microphone terminal appearing in the above embodiments are specific examples of the foregoing first audio terminal, second audio terminal and third audio terminal.
- an embodiment of the present invention also provides a handheld electronic device 500 with the multi-purpose connector 400 described above.
- the electronic device 500 includes a multipurpose connector 400 and a main control unit 360 as described in the foregoing embodiments, the main control unit 360 being coupled to the high definition video/audio transceiver and the audio output module, respectively.
- the handheld electronic device 500 can also include one or more input devices 380 for receiving input from a user, the output of the input device 380 It is coupled to the main control unit 360.
- Input device 380 can be a keyboard, a touch screen, or a voice input device.
- the handheld electronic device 500 can also include one or more output devices 370, the input of which is coupled to the main control unit 360.
- Output device 370 can be a display screen, a speaker, or the like. As is known to those skilled in the art, a corresponding interface module is usually also provided between the input device 380, the output device 370 and the main control unit 360. Handheld electronic device 500 may also include one or more antennas 510 coupled to radio frequency circuitry 520 for transmitting and receiving wireless signals to cause electronic device 500 to interact with the network. Those skilled in the art can understand that although the above embodiments are all multiplexed with the headphone interface as
- the MHL interface is an example, but the headphone interface is multiplexed into other video interfaces that use only a pair of differential lines to transmit video signals, just like the MHL interface.
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- Acoustics & Sound (AREA)
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Description
将耳机接口复用为高清视音频接口的多用途连接器及手持 电子设备
技术领域
本发明涉及通信技术领域, 特别是涉及一种服务质量配置的方法、 装 置和***。
背景技术
当今的手持电子设备, 例如智能手机、 平板电脑 (Tablet PC )等, 普 遍都具有了高清( High Definition, HD )视频摄录能力, 现在许多高端的智 能手机已经能够拍摄流畅的 1080p解析度的高清视频。 此外, 随着高清视频 越来越普及, 许多手持电子设备上存储了大量的高清视频, 然而, 由于手 持电子设备的屏幕较小, 在手持电子设备上播放高清视频难以体现高清的 优势, 因此消费者迫切需要将高清视频输出到大屏幕显示设备一一例如电 视机、 投影仪、 电脑(PC ) ——的方法。
高清多媒体接口 ( High Definition Multimedia Interface, HDMI )是一种 传输无压缩数字高清视频 /音频的接口, 它向前和向后兼容数字视频接口 ( Digital Video Interface, DVI )。 DVI仅仅传输视频数据, 而 HDMI则是在 DVI 的视频数据脉沖串 (burst ) 的间隙***多声道音频数据和状态数据。 在数据传输上, HDMI 使用最小化传输差分信号 (Transition Minimized Differential Signaling, TMDS )技术。 TMDS技术是一种利用 2个引脚间电 压差来传送信号的技术(即差分传输 ) , TMDS具备 4个 Channel, 前 3条 缆线分是 YU ( Pb ) V ( Pr ) 的传输线, 或视为 RGB的传输线, 第 4条是 Clock, 以保证传输时所需的统一时序, 总称为 1个连接或 Single-link。 每 个通道最大传输速度是 165MHz(4.95 Gb/s), 1个连接有 5Gbps的传输速度。 MDS 解码之后的原始资料被高清内容保护 ( High Definition Content Protection, HDCP )加密。 并采用了 8b/10b差分信号来降低 EMI及提高精
确的信号传输速率, 将 8比特的输入信号转换成 10比特的编码。 HDMI接 口的连接器有三种物理规格, 分别称为 Type A、 Type B和 Type C。 Type A 包含 19根引脚(pin )组成, 各引脚的定义如图 1所示。 可以看出, 其中一 共有 6根引脚用于传输 TMDS数据, 这 6根引脚分别连接到 3对差分传输 线(Differential Transmission Line ), 有 2根引脚传输 TMDS时钟信号, 此 夕卜,还有供电、屏蔽、接地、控制信号等引脚。 Type A插口的最宽处为 14mm, 高 4.55mm。 Type B有 29根引脚, 尺寸较大。 Type C和 Type A一样有 19 根引脚, 仅在尺寸上有区别, 其插口大小为 10.5mmx2.5mm。 适合手持移动设备。 但是 Type C在很小的尺寸内布置了 19个引脚, 这就 使得接口制造的精度要求大大提高, 增加了制造成本, 同时密集的布线也 降低了接口的可靠性, 事实上, Type C HDMI连接器的可插拔次数远低于 类似大小的其他连接器, 例如微型通用串行总线 ( Micro USB )连接器。
此外, 手持电子设备本身体积较小, 增加接口一方面占用空间, 一方 面也增加了制造成本。 发明内容
本发明要解决的技术问题是如何在手持电子设备上实现较 d、尺寸的高 清视频接口, 同时又尽量不增加手持电子设备的接口数量。
本发明的一个实施例提供一种将耳机接口复用为高清视频 /音频输入 接口的多用途连接器, 包括:
耳机连接器、 选择开关、 高清视频 /音频收发器、 音频输出模块, 其中, 耳机连接器包括第一音频端子、 第二音频端子;
所述音频输出模块用于输出耳机音频信号;
所述选择开关包括两路, 当所述选择开关连通第一路时, 所述第一音 频端子和第二音频端子分别和一对差分传输线相耦合, 所述差分传输线用
于传输所述高清视频 /音频收发器输出的高清视频 /音频数据; 当所述选择 开关连通第二路时, 所述第一音频端子和所述音频输出模块相耦合。
本发明另一个实施例提供一种手持电子设备, 包括:
多用途连接器和主控单元, 所述多用途连接器包括耳机连接器、 选择 开关、 高清视频 /音频收发器、 音频输出模块, 其中,
耳机连接器包括第一音频端子、 第二音频端子和接地端子;
所述音频输出模块用于输出耳机音频信号;
所述选择开关包括两路, 当所述选择开关连通第一路时, 所述第一音 频端子和第二音频端子分别和一对差分传输线相耦合, 所述差分传输线用 于传输所述高清视频 /音频收发器输出的高清视频 /音频数据; 当所述选择 开关连通第二路时, 所述第一音频端子和所述音频输出模块相耦合;
所述主控单元分别与所述高清视频 /音频收发器和所述音频输出模块 相耦合。
以上本发明实施例提供的多用途连接器和手持电子设备, 可以使耳机 接口被复用为高清视频 /音频接口, 可以传输高清视频 /音频。 由于耳机接 口尺寸较小, 且基本所有的手持电子设备都有装备, 这样在手持电子设备 的较小体积上实现了高清视频 /音频接口, 同时也没有增加手持电子设备上 接口的数量。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对 实施例或现有技术描述中所需要使用的附图作筒单地介绍。 以下附图中, 凡涉及电路的, 若线交叉之处没有圆点, 则表示这些线没有电连接, 若线 交叉之处有圆点, 则表示这些线电连接。
图 1为 HDMI插座的各引脚示意图;
图 2A为传统的 4芯耳机插孔的结构示意图;
图 2B为 MHL插座的结构示意图
图 3为本发明一实施例提供的连接器的结构示意图;
图 4为本发明另一实施例提供的连接器的结构示意图;
图 5为本发明又一实施例提供的连接器的结构示意图;
图 6为 MHL设备发现的原理图;
图 7为一种耳机插孔***检测方法的电路原理图;
图 8为一种耳机类型检测方法的电路原理图;
图 9为本发明一实施例实现选择开关切换的电路原理图;
图 10为本发明另一实施例实现选择开关切换的电路原理图。
图 11是本发明一个实施例通过物理开关控制选择开关切换的连接器的 结构示意图;
图 12是本发明一个实施例提供的手持电子设备的结构示意图
具体实施方式 以下结合附图对本发明的具体实施方式进行详细的说明。 首先, 对以 下各实施例中的用词和术语进行解释:
所谓 "手持电子设备", 是指其尺寸适于手持的各种电子设备, 包括但 不限于: 手机、 个人数字助理(Personal Digital Assistant, PDA ), 平板电 脑(Tablet PC )、 数码相机、 数码摄像机、 MP3/MP4播放器。
所谓 "连接器", 是指将两个设备连接起来的部件, 通常包括一个插座 ( socket )或者插头( plug ),还可以包括与该插座或插头相耦合的接口器件。 连接器可以是个分立的部件, 也可以集成在手持电子设备上。
当以下各实施例提到曱与乙相 "耦合" 时, 是指通过曱的电信号与通 过乙的电信号发生物理上的确定关联, 这包括曱与乙通过导线等直接连接, 或者通过另一个部件丙间接相连, 也包括曱与乙之间如变压器那样通过电
磁感应使经过各自的电信号发生关联。
当本发明提及 "第一"、 "第二,, 等序数词时, 除非根据上下文其确实 表达顺序之意, 应当理解为仅仅^^区分之用。
发明人在实现本发明的过程中发现, 现在所有的手持电子设备基本都 有耳机接口, 因此可以考虑将耳机接口复用为高清视频接口。 图 2A是现有 的耳机连接器的示意图。 现在常见的耳机有所谓 3芯耳机和 4芯耳机。 图 2A表示一个典型的 4芯耳机插孔, 该插孔 300中包括 4个端子, 其中第一 音频端子 301 与手持电子设备的第一声道输出相耦合, 第二音频端子 302 与手持电子设备的第二声道输出相耦合, 第三音频端子 303 与手持电子设 备的话筒输入相耦合, 此外还有一个接地端子 304, 与地相连。 可以看出, 传统的 HDMI需要 3对差分传输线传输高清视频数据, 而耳机接口难以满 足这么多传输通道的要求。
现在有一种称为移动高清连接 ( Mobile High Definition Link, MHL )的 新型高清视频接口, 它采用 1对差分传输线来传输高清视频数据。 MHL通 过复用 HDMI标准下的数据, 将 HDMI的 3条传输通道通过 1条传输通道 来传输。
图 2B是 MHL接口的示意图。可以看出, MHL接口一般使用 5个引脚, 其中一个连接电源线(VBUS ), 2个连接差分传输线(TMDS+、 TMDS- ), 1个连接控制总线(CBUS ), 1个接地(GND )。 其中, 差分传输线是用来 传输高清视频 /音频数据的, 电源线用来给该 MHL接口所在的设备供电。 控制总线用来传输一些控制信号。 发明人在实现本发明的过程中发现, 由 于 MHL只需要 1对差分传输线传输高清视频 /音频信号, 因此可以通过耳 机接口实现复用。
在本发明的一个实施例中, 一个将耳机接口复用为高清视频 /音频输入 接口的多用途连接器包括: 耳机连接器、 选择开关、 高清视频 /音频收发器、 音频输出模块, 其中耳机连接器包括第一音频端子、 第二音频端子, 可选 的还包括接地端子。 所述音频输出模块用于输出耳机音频信号。 所述选择 开关包括两路, 所述选择开关连通第一路时, 所述第一音频端子和第二音 频端子分别和一对差分传输线相耦合, 所述差分传输线用于传输所述高清 视频 /音频收发器输出的高清视频 /音频数据; 当所述选择开关连通第二路
时, 所述第一音频端子和所述音频输出模块相耦合。 可选的, 当所述选择 开关连通第二路时, 所述第一音频端子和所述音频输出模块的第一声道输 出端相耦合, 所述第二音频端子和所述音频输出模块的第二声道输出端相 耦合。
在本发明的一些实施例中, 所述连接器还包括音频输入模块, 用于接 收话筒输入信号。 所述耳机连接器还包括第三音频端子, 所述第三音频端 子在所述选择开关连通第一路时, 与高清视频 /音频收发器的控制总线相耦 合, 在所述选择开关连通第二路时, 与音频输入模块的输入端相耦合。
在本发明的一些实施例中, 所述第一音频端子是传统耳机连接器中的 第一声道端子, 所述第二音频端子是传统耳机连接器中的第二声道端子, 所述第三音频端子是传统耳机连接器中的话筒端子; 而在本发明的另一些 实施例中, 所述第一音频端子是传统耳机连接器中的第一声道端子, 所述 第二音频端子是传统耳机连接器中的话筒端子, 所述第三音频端子是传统 耳机连接器中的第二声道端子。
这里, 第一声道和第二声道是手持电子设备音频输出的两个不同声道, 可以分别是左声道和右声道, 也可以分别是普通声道和低音声道, 本发明 对此不做限定。
在本发明的一些实施例中, 所述连接器还包括连接检测模块, 用于检 测所述连接器是否与其他设备相连接。 所述连接检测模块与手持电子设备 的主控单元相耦合, 当所述连接检测模块检测到所述连接器与其他设备相 连接时, 所述主控单元执行一段程序, 提示所述手持电子设备的用户选择 高清视频 /音频连接或耳机连接, 并根据用户输入的选择指令, 控制所述选 择开关在所述第一路和第二路之间切换。
在本发明的一些实施例中, 所述连接器还包括设备类型检测模块, 用 于检测与连接器连接的设备的类型。 当所述设备类型检测模块检测到所述 连接的设备是高清视频 /音频接收端设备时, 向所述主控单元输出第一检测 信号, 所述主控单元根据第一检测信号控制所述选择开关连通第一路; 当 所述设备类型检测模块检测到所述连接的设备是耳机时, 向所述主控单元 输出第二检测信号, 所述主控单元根据第二检测信号控制所述选择开关连 通第二路。
图 3是本发明一个连接器实施例的结构示意图。 如图所示, 耳机连接 器 300内包括 4个端子: 第一声道端子 301 , 第二声道端子 302, 话筒端子 303, 和接地端子 304。 其中, 第一声道端子 301和第二声道端子 302分别 连接做道和右声道, 话筒端子用于连接话筒, 输入话筒产生的音频信号。
MHL收发器 320是一个用于收发 MHL高清视频 /音频数据的元件, 通 常, 它可以是一块芯片, 例如 SiI9232、 SiI9236、 SH9244 系列芯片, 但是 本发明实施例不局限于此。 MHL收发器 320的作用是将高清视频 /音频数据 转换成 MHL格式, 并通过 1对差分传输线( TMDS+、 TMDS- )传输上述 高清视频 /音频数据。
选择开关 310是一个电子开关或者机械开关, 该开关有两路, 当选择 开关 310连通第一路时, 所述差分传输线(TMDS+、 TMDS- )分别与第一 声道端子 301和第二声道端子 302相耦合; 当选择开关 310连通第二路时, 第一声道端子 301和第二声道端子 302分别与左声道输出线和右声道输出 线相耦合。 这里, 可以是第一声道端子 301耦合到左声道输出线, 而第二 声道端子 302耦合到右声道输出线; 也可以是第一声道端子 301耦合到右 声道输出线, 而第二声道端子 302耦合到左声道输出线。 所述左声道输出 线和右声道输出线耦合到音频输出模块 330。
音频输出模块 330是用于输出耳机音频信号的模块。 通常来说, 该模 块包括数模转换器(A/D Converter ), 通过将音频输出模块 330接收到的数 字音频信号转换为模拟信号, 使得音频可以通过耳机接口输出。 可选的, 音频输出模块 330还包括功率放大器( PA ) , 耦合在所述数模转换器的输出 端上, 可以将所述模拟信号放大。 音频输出模块 330可以输出多声道音频, 每个声道的音频信号对应一条输出线。
显然, 通过上述实施例, 耳机接口可以被复用为高清视频 /音频接口, 可以传输高清视频 /音频。 由于耳机接口尺寸较小, 且基本所有的手持电子 设备都有装备, 这样在手持电子设备的较小体积上实现了高清视频 /音频接 口, 同时也没有增加手持电子设备上接口的数量。
图 4是本发明的另一个连接器实施例的示意图。 在图 3所示的实施例 的基础上, 当选择开关 310连通第一路时, 所述耳机连接器的话筒端子与 MHL控制总线 (CBUS )相耦合; 当选择开关 310连通第二路时, 所述耳
机连接器的话筒端子与话筒输入线相耦合, 所述话筒输入线耦合到音频输 入模块 340。
音频输入模块 340是用于接收话筒输入信号的模块。 通常来说, 该模 块包括模数转换器( D / A Converter ) ,通过将来自话筒的模拟信号转换为数 字音频信号, 使得手持电子设备可以处理话筒输入的音频。 可选的, 音频 输入模块 340还包括功率放大器( PA ) ,耦合在所述模数转换器的输入端上, 可以将所述模拟信号放大。
在本发明的一些实施例中, 选择开关 310在默认的状态下连通前述第 一路电路, 即所述差分传输线(TMDS+、 TMDS- )分别与第一声道端子 301 和第二声道端子 302相耦合; 在本发明的另一些实施例中, 选择开关 310 在默认的状态下连通前述第二路,即第一声道端子 301和第二声道端子 302 分别与左声道输出线和右声道输出线相耦合。
在本发明的一些实施例中, 选择开关 310的切换可以通过如下方式触 发:
1.如图 11所示, 可以在手持电子设备上设置一个物理开关 315 , 该物 理开关 315可以控制选择开关 310在第一路和第二路之间切换。 如 本领域技术人员所知, 该物理开关 315可以通过机械或者电子的方 式对选择开关 310的切换进行控制。
2.可以通过软件的方式进行控制。 现在手持电子设备上的耳机连接器 一般都具有***检测的功能, 即当有插头***耳机连接器时, 可以 产生一个信号传输给手持电子设备的主控单元(例如中央处理单元 CPU, 基带芯片、 图形处理器等), 使主控单元获知有插头***。 具 体可以设置一个***检测模块, 用于当有插头***耳机连接器时, 输出***检测信号, 该模块的输出端与所述主控单元相耦合。 当主 控单元获知有插头***时, 主控单元执行一段程序, 提示手持电子 设备的用户选择耳机输出或者高清视频 /音频连接。 用户可以通过手 持电子设备的输入设备, 例如按键或者触摸屏, 输入选择指令, 选 择耳机输出或者高清视频 /音频连接。 主控单元在接受到用户输入的 选择指令后, 根据所述选择指令控制选择开关 310在第一路和第二 路之间切换。 例如, 选择开关 310可以有一个控制信号输入端, 选
择开关 310根据该输入端输入的控制信号在第一路和第二路之间切 换。 而主控单元则与这个输入端相耦合, 向这个输入端发出控制信
3.可以通过硬件的方式进行控制。 可以设计一个识别电路, 用于识别 ***耳机连接器的设备的类型, 从而控制选择单元 310的切换。 下面对上述第 2种和第 3种方式进行详细的说明。
参照图 7, 这是对耳机连接器进行***检测的一种电路的电路图。耳机 插头增加了一段, 该段有专门的耳机***端子 PLUGIN; 同时, 电子设备 的耳机插座 J1上的引脚 5变为耳机***引脚: PLUGIN,且引脚 5和引脚 6 之间增加了一个簧片, 以用于检测耳机插头 PLUGIN是否*** Jl。 另外, 该图中, J1的引脚 5通过电阻 R47外接了一个高电平: 3.0V。 当然, 本领 域技术人员可以理解, 这里的高电平也可以是其他数值。 具体工作原理如下: 当耳机插头上的 PLUGIN未*** J1的引脚 5和 6 之间时, CHECK信号接地。 当耳机插头的 PLUGIN*** J1的引脚 5和 6 之间后, J1的引脚 6弹开, 由于通过电阻 R47, 3.0V高电平对 CHECK信 号进行高电位上拉, CHECK信号表现为逻辑高电平。 因此, 当 CHECK信 号由逻辑低电平变为逻辑高电平时, 电子设备就认为耳机已***。 实际应 用中, 根据具体电路设计的不同, 当耳机插头*** J1后, CHECK信号也 有可能是从逻辑高电平变为逻辑低电平。
当然, 对耳机连接器进行***检测有很多方法, 此处不——列举。 如图 9所示,在本发明的一个实施例中,耳机连接器 300还包括***检 测引脚 305 ,该引脚在无插头***耳机连接器 300时搭接在接地端子 304上, 而当有插头***时则与接地端子断开连接。 这一点可以通过!巴***检测引 脚 305设计成一个弹片来实现。 当没有插头***时, 该引脚抵压在接地端 子 304上, 而当插头***时, 该引脚***头顶开而与接地端子 304脱离接 触。 当然, 也可以通过其他方式来实现***检测引脚 305的上述连接状态。
***检测弓 I脚 305可选的与一电阻 R1相耦合, 电阻 R1上施加有偏置 电压 V_CHECK,***检测引脚 305还与检测信号输出模块 350的输入端相 耦合。 当***检测引脚 305同接地端子 304连接时,检测信号输出模块 350
接地, 因此该模块检测到一个大致为 0V的电位, 而当***检测引脚 305与 接地端子断开连接时, 检测信号输出模块 350通过电阻 R1 连到偏置电压 V_CHECK, 通常偏置电压 V_CHECK会比地电位(0V ) 高出许多, 譬如 为 3V, 此时检测信号输出模块 350可以检测到显著的电位变化。 当然, 偏 置电压 V_CHECK也可以低于地电位, 例如为 -3V。
检测信号输出模块 350用于向主控单元 360输出***检测信号。 该模 块可以是一个筒单的晶体管, 对检测信号进行緩沖, 该晶体管还可提供必 要的电平转换, 以便与控制器连接。 该模块还可以是一个比较器, 例如 MAX9060系列比较器, 通过将检测到的电位和一个参考电位相比较, 输出 相应的检测信号。 例如, 当检测到的电位低于参考电位时输出低电平, 反 之则输出高电平。 一般地, 所述检测信号输出模块在第一电位与所述第一 偏置电压的差值的绝对值小于或等于第一阈值时, 输出***检测信号, 所 述第一电位为所述检测信号输出模块的输入端与所述***检测引脚的耦合 点的电位。
检测信号输出模块 350的输出端耦合到主控单元 360。本领域技术人员 可以理解, 在检测信号输出模块 350和主控单元 360之间可以设置一个输 入 /输出接口 (I/O Interface )模块, 将检测信号输出模块 350输出的***检 测信号转换为主控单元 360某个 I/O接口的中断信号,从而在主控单元 360 产生一个中断。
当主控单元 360接收到***检测信号时, 主控单元 360可以执行一段 程序, 通过输出装置 370提示用户选择高清视频 /音频输出或耳机输出。 这 里输出装置 370可以是屏幕, 比如在屏幕上显示一个对话框, 让用户选择; 也可以是扬声器, 用语音进行提示。 本发明实施例对此不作限制。
之后, 用户可以通过输入装置 380输入自己的选择, 输入装置 380接 收用户的输入, 产生一个输入信号, 并将该输入信号传输给主控单元 360。 输入装置 380可以是触摸屏、 按键或者语音输入装置等, 本发明实施例对 此不作限制。
输出装置 370的输入端和主控单元相耦合, 输入装置 380的输出端和 主控单元 360相耦合。 本领域技术人员可以理解, 在输出装置 370的输入 端和主控单元 360之间,和 /或输入装置 380的输出端和主控单元 360之间,
通常设置有 I/O接口模块,用于将主控单元 360输出的数据转换成输出装置 370可识别的信号, 或者将输入装置 380产生的输入信号转换成主控单元 360某个 I/O接口的中断信号。
主控单元 360接收到输入装置 380产生的输入信号后, 根据所述输入 信号向选择开关 310输出一个控制信号, 控制选择开关 310进行切换。
对于前述的第 3种方式, 参照图 6, 这是 MHL设备发现的原理图。 在 初始状态下,开关 SW3是闭合的,也就是说在 MHL接收端,控制总线 CBUS 和地之间串接有一个电阻 Rd, 在图 6的示例中, Rd的值为 lkQ , 通常来 说, Rd的值在 800Ω~1200Ω之间。 当 MHL源端设备和 MHL接收端设备 通过 MHL连接器相连的时候, MHL源端设备首先会检测 CBUS线上的阻 抗, 如果发现阻抗在 800Ω~1200Ω之间, MHL源端设备就会认为可能接上 了 MHL接收端设备。 接着 MHL源端设备会检测图 2Β中所示的 VBUS是 否有输入, 如果有输入, 则开始设备发现过程; 或者在一段时间内没有检 测到 VBUS有输入,也会开始设备发现过程。在设备发现过程的开始, MHL 源设备会通过 CBUS发送一串 Wake up和 Discovery脉沖, MHL接收端设 备在收到这一串脉沖后会判断出与自己连接的是 MHL源设备,此时接通开 关 SW4,断开开关 SW3,由于 CBUS上并联到地的电阻变为 lOOkQ , CBUS 上变为高电平。 当 MHL 源端设备检测到高电平时, 即可判断出连接的是 MHL接收端设备。 此时接通开关 SW1 , 断开开关 SW2, 继续进行 MHL设 备发现过程, 直至发现过程结束。
从以上 MHL设备发现过程可以看出, 发现过程的启动需要依靠对 CBUS线上的阻抗测定,当阻抗落在 800Ω~1200Ω之间时触发 MHL设备发 现过程。 然而, 现在^艮多话筒的阻抗也落在这一范围内, 因此, 如果 CBUS 和话筒共用一个端子, 有可能引发误判。 而耳机的阻抗一般都很小, 通常 在几十欧姆甚至几欧姆, 所以如果让 CBUS和耳机通用端子, 则可以很好 的避免误判。 也就是说, 所述连接器可以如图 5所示, 当选择开关连通第 一路时, 第一声道端子 301和话筒端子 303与所述差分传输线相耦合, 第 二声道端子 302与控制总线 CBUS相耦合; 当选择开关连通第二路时, 第 一声道端子 301和第二声道端子 302分别与左声道和右声道相耦合, 话筒 端子 303与话筒输入相耦合。
如图 10所示, 在本发明的一个实施例中, 当选择开关 310连通前述第 一路时, 第二声道端子 302与 MHL控制总线(CBUS )相耦合, 当选择开 关 310连通前述第二路时, 第二声道端子 302与右声道(也可以是左声道) 输出相耦合。 第二声道端子 302还与一电阻 R2相耦合, 电阻 R2上施加有 偏置电压\^_( 1¾( 。 R2的值通常较大, 例如为几千欧姆。 第二声道端子 同时与检测信号输出模块 350相耦合。当 MHL接收端设备连接到耳机连接 器 300时, 由于第二声道端子此时连接到 MHL接收端设备的 CBUS上, 由 于 MHL接收端设备的 CBUS和地之间接有一个 800Ω~1200Ω的电阻, 此 时检测信号输出模块 350可以检测到第二声道端子 302的电位较高, 例如 R2=lkO , V_CHECK=3V, 则此时第二声道端子 302上的电位大约为 1.5V。 而当耳机连接到耳机连接器 300时, 由于耳机的阻抗很小, 此时检测信号 输出模块 350可以检测到第二声道端子 302的电位较低 (通常接近于 0V )。 因此可以通过第二声道端子上电位的明显变化判断出连接的是 MHL接收 端设备还是耳机。另一种替代的实施例是 R2的数值很小,例如只有几欧姆, 在此种情况下, 当 MHL接收端设备连接到耳机连接器 300时, 由于第二声 道端子此时连接到 MHL接收端设备的 CBUS上, 由于 MHL接收端设备的 CBUS和地之间接有一个 800Ω~1200Ω的电阻,此时检测信号输出模块 350 可以检测到第二声道端子 302的电位较高,通常接 i^ V_CHECK。 而当耳机 连接到耳机连接器 300时, 由于耳机的阻抗很小, 此时检测信号输出模块 350可以检测到第二声道端子 302的电位较低,例如只有 V_CHECK的一半。
检测信号输出模块 350用于向主控单元 360输出***检测信号。 该模 块可以是一个筒单的晶体管, 对检测信号进行緩沖, 该晶体管还可提供必 要的电平转换, 以便与控制器连接。 该模块还可以是一个比较器, 例如 MAX9060系列比较器, 通过将检测到的电位和一个参考电位相比较, 输出 相应的检测信号。 例如, 当检测到的电位低于参考电位时输出低电平, 反 之则输出高电平。
一般地, 检测信号输出模块 350用于当所述第二音频端子上的阻抗为 第一阻抗时, 输出视频检测信号, 以及, 当所述第二音频端子上的阻抗为 第二阻抗时, 输出耳机检测信号。这里, 视频检测信号指示连接的设备是高 清视频 /音频设备, 而耳机检测信号指示连接的是耳机或其他音频输出设备
(例如音箱)。 一般地, 所述第二音频端子上加有第二偏置电压, 所述第二 偏置电压与第二耦合点之间串接有第一电阻, 所述第二耦合点为所述检测 信号输出模块的输入端与所述第二音频端子的耦合点; 所述检测信号模块 具体用于当第二电位与所述第二偏置电压的差值的绝对值小于或等于第三 阈值时输出第一路检测信号, 当所述第二电位与所述第二偏置电压的差值 的绝对值大于所述第三阈值时输出第二路检测信号, 或者, 所述检测信号 模块具体用于当第二电位与所述第二偏置电压的差值的绝对值小于或等于 第三阈值时输出第一路检测信号, 当所述第二电位与所述第二偏置电压的 差值的绝对值大于所述第三阈值时输出第二路检测信号; 这里所述第二电 位为所述第二耦合点的电位。 检测信号输出模块 350的输出端耦合到主控单元 360。本领域技术人员 可以理解, 在检测信号输出模块 350和主控单元 360之间可以设置一个输 入 /输出接口 (I/O Interface )模块, 将检测信号输出模块 350输出的***检 测信号转换为主控单元 360某个 I/O接口的中断信号,从而在主控单元 360 产生一个中断。
主控单元 360在接收到检测信号输出模块输出的检测信号之后, 产生 一个控制信号, 控制选择开关 310进行切换。 例如, 当检测信号表明耳机 连接器连接的是 MHL接收端设备时, 控制选择开关 310连通第一路; 当检 测信号表明耳机连接器连接的是耳机时, 控制选择开关 310连通第二路。
本领域技术人员可知, 前述图 9和图 10所述的实施例可以相结合。 本领域技术人员可以理解, 上述各实施例中出现的第一声道端子、 第 二声道端子、 话筒端子, 是前述第一音频端子、 第二音频端子和第三音频 端子的具体实例。
如图 12所示, 本发明的一个实施例还提供一种带有上述多用途连接器 400的手持电子设备 500。 该电子设备 500包括如前述各实施例所述的多用 途连接器 400和主控单元 360, 主控单元 360分别与所述高清视频 /音频收 发器和所述音频输出模块相耦合。 此外, 该手持电子设备 500还可以包括 一个或多个输入装置 380, 用于接收用户的输入, 该输入装置 380的输出端
与主控单元 360相耦合。 输入装置 380可以为键盘、 触摸屏或者语音输入 装置。 该手持电子设备 500还可以包括一个或多个输出装置 370, 该输入装 置 370的输入端与主控单元 360相耦合。 输出装置 370可以为显示屏、 扬 声器等。 如本领域技术人员所知, 输入装置 380、 输出装置 370与主控单元 360之间通常还设有相应的接口模块。手持电子设备 500还可以包括一个或 多个天线 510, 该天线 510与射频电路 520相耦合, 用于发射和接收无线信 号, 使电子设备 500和网络交互数据。 本领域技术人员可以理解, 虽然以上各实施例均以耳机接口复用为
MHL接口为例, 但是将耳机接口复用为其他和 MHL接口一样只使用一对 差分线传输视频信号的视频接口也都适用。
另外, 以上实施例中分别说明的各技术、 ***、 装置、 方法以及各实 施例中分别说明的技术特征可以进行组合, 从而形成不脱离本发明的精神 和原则之内的其他的模块, 方法, 装置, ***及技术, 这些根据本发明实 施例的记载组合而成的模块, 方法, 装置, ***及技术均在本发明的保护 范围之内。
显然, 本领域的技术人员应该明白, 上述的本发明的各单元或各步骤 可以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者 分布在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执 行的程序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来 执行。 或者将它们分别制作成各个电路模块, 或者将它们中的多个单元或 步骤制作成单个电路模块来实现。 这样, 本发明不限制于任何特定的硬件 和软件结合。
以上只是本发明的较佳实施例, 并非用于限定本发明的保护范围。 凡 在本发明的精神和原则之内所作的任何修改、 等同替换、 改进等, 均包含 在本发明的保护范围内。
Claims
1. 一种将耳机接口复用为高清视频 /音频输入接口的多用途连接器, 包括: 耳机连接器、 选择开关、 高清视频 /音频收发器、 音频输出模块, 其中, 耳机连接器包括第一音频端子、 第二音频端子;
所述音频输出模块用于输出耳机音频信号;
所述选择开关包括两路, 当所述选择开关连通第一路时, 所述第一音 频端子和第二音频端子分别和一对差分传输线相耦合, 所述差分传输线用 于传输所述高清视频 /音频收发器输出的高清视频 /音频数据; 当所述选择 开关连通第二路时, 所述第一音频端子和所述音频输出模块相耦合。
2. 如权利要求 1所述的多用途连接器, 其特征在于: 当所述选择开关连通 第二路时, 所述第一音频端子和所述音频输出模块的第一声道输出端相耦 合, 所述第二音频端子和所述音频输出模块的第二声道输出端相耦合。
3. 如权利要求 2所述的多用途连接器, 其特征在于: 所述耳机连接器还包 括第三音频端子, 所述多用途连接器还包括音频输入模块, 当所述选择开 关连通第一路时, 所述第三音频端子与所述高清视频 /音频收发器的控制总 线相耦合, 当所述选择开关连通第二路时, 所述第三音频端子与所述音频 输入模块相耦合。
4. 如权利要求 1所述的多用途连接器, 其特征在于: 所述多用途连接器还 包括音频输入模块, 当所述选择开关连通第二路时, 所述第一音频端子和 所述音频输出模块的第一声道输出端相耦合, 所述第二音频端子和所述音 频输入模块相耦合。
5. 如权利要求 4所述的多用途连接器, 其特征在于: 所述耳机连接器还包 括第三音频端子, 所述多用途连接器还包括音频输入模块, 当所述选择开 关连通第一路时, 所述第三音频端子与所述高清视频 /音频收发器的控制总 线相耦合, 当所述选择开关连通第二路时, 所述第三音频端子和所述音频 输出模块的第二声道输出端相耦合。
6. 如权利要求 1至 5任一项所述的多用途连接器, 其特征在于: 所述多用 途连接器还包括一物理开关, 所述物理开关用于控制所述选择开关在第一 路和第二路之间切换。
7. 如权利要求 1至 5任一项所述的多用途连接器, 其特征在于:
所述多用途连接器还包括***检测模块, 所述***检测模块的输出端 与一主控单元相耦合, 所述***检测模块用于当有插头***所述耳机连接 器时, 输出***检测信号;
所述主控单元与一输入装置的输出端相耦合, 并与一输出装置的输入 端相耦合, 以及与所述选择开关相耦合;
所述输入装置用于接收用户的输入的选择, 当所述输入的选择指示所 述选择开关连通所述第一路时, 输出第一选择信号, 当所述输入的选择指 示所述选择开关连通所述第二路时, 输出第二选择信号;
所述主控单元用于在所述***检测信号的触发下控制所述输出装置提 示用户选择所述选择开关连通所述第一路或所述第二路, 以及, 根据所述 第一选择信号, 控制所述选择开关连通所述第一路, 根据所述第二选择信 号, 控制所述选择开关连通所述第二路。
8. 如权利要求 7所述的多用途连接器, 其特征在于:
所述耳机连接器还包括接地端子和***检测引脚, 所述***检测引脚 在无插头***所述耳机连接器时搭接在所述接地端子上, 当有插头***时 则与接地端子断开连接, 所述***检测弓 I脚上加有第一偏置电压;
所述检测信号输出模块的输入端与所述***检测引脚相耦合; 所述检测信号输出模块用于当第一电位与所述第一偏置电压的差值的 绝对值小于或等于第一阈值时, 输出***检测信号, 所述第一电位为第一 耦合点的电位, 所述第一耦合点为所述检测信号输出模块的输入端与所述 ***检测引脚的耦合点。
9. 如权利要求 4或 5所述的多用途连接器, 其特征在于: 所述耳机连接器 还包括接地端子, 所述多用途连接器还包括检测信号输出模块, 所述检测 信号输出模块的输入端与所述第二音频端子相耦合, 所述检测信号输出模 块的输出端与一主控单元相耦合, 所述主控单元与所述选择开关相耦合; 所述检测信号输出模块用于当所述第二音频端子上的阻抗为第一阻 抗时, 输出视频检测信号, 以及, 当所述第二音频端子上的阻抗为第二阻 抗时, 输出耳才 1全测信号;
所述主控单元用于根据所述视频检测信号控制所述选择开关连通所 述第一路, 以及, 根据所述耳机检测信号控制所述选择开关连通所述第二 路。
10. 如权利要求 9所述的多用途连接器, 其特征在于:
所述第二音频端子上加有第二偏置电压, 所述第二偏置电压与第二耦 合点之间串接有第一电阻, 所述第二耦合点为所述检测信号输出模块的输 入端与所述第二音频端子的耦合点;
所述检测信号模块具体用于当第二电位与所述第二偏置电压的差值的 绝对值大于或等于第二阈值时输出第一路检测信号, 当所述第二电位与所 述第二偏置电压的差值的绝对值小于所述第二阈值时输出第二路检测信 所述第二电位为所述第二耦合点的电位。
11. 如权利要求 9所述的多用途连接器, 其特征在于:
所述第二音频端子上加有第二偏置电压, 所述第二偏置电压与第二耦 合点之间串接有第一电阻, 所述第二耦合点为所述检测信号输出模块的输 入端与所述第二音频端子的耦合点;
所述检测信号模块具体用于当第二电位与所述第二偏置电压的差值的 绝对值小于或等于第三阈值时输出第一路检测信号, 当所述第二电位与所 述第二偏置电压的差值的绝对值大于所述第三阈值时输出第二路检测信 所述第二电位为所述第二耦合点的电位。
12. 如权利要求 1至 11任一项所述的多用途连接器, 其特征在于: 所述高 清视频 /音频收发器为移动高清连接 MHL收发器。
13.—种手持移动设备, 包括:
多用途连接器和主控单元, 所述多用途连接器包括耳机连接器、 选择 开关、 高清视频 /音频收发器、 音频输出模块, 其中,
耳机连接器包括第一音频端子、 第二音频端子和接地端子;
所述音频输出模块用于输出耳机音频信号;
所述选择开关包括两路, 当所述选择开关连通第一路时, 所述第一音 频端子和第二音频端子分别和一对差分传输线相耦合, 所述差分传输线用 于传输所述高清视频 /音频收发器输出的高清视频 /音频数据; 当所述选择 开关连通第二路时, 所述第一音频端子和所述音频输出模块相耦合;
所述主控单元分别与所述高清视频 /音频收发器和所述音频输出模块 相耦合。
14. 如权利要求 13所述的手持电子设备, 其特征在于:
当所述选择开关连通第二路时, 所述第一音频端子和所述音频输出模 块的第一声道输出端相耦合, 所述第二音频端子和所述音频输出模块的第 二声道输出端相耦合。
15. 如权利要求 14所述的手持电子设备, 其特征在于: 所述耳机连接器还 包括第三音频端子, 所述多用途连接器还包括音频输入模块, 当所述选择 开关连通第一路时, 所述第三音频端子与所述高清视频 /音频收发器的控制 总线相耦合, 当所述选择开关连通第二路时, 所述第三音频端子与所述音 频输入模块相耦合, 所述主控单元与所述音频输入模块相耦合。
16. 如权利要求 13所述的手持电子设备, 其特征在于: 所述多用途连接器 还包括音频输入模块, 当所述选择开关连通第二路时, 所述第一音频端子 和所述音频输出模块的第一声道输出端相耦合, 所述第二音频端子和所述 音频输入模块相耦合, 所述主控单元与所述音频输入模块相耦合。
17. 如权利要求 16所述的多用途连接器, 其特征在于: 所述耳机连接器还 包括第三音频端子, 所述多用途连接器还包括音频输入模块, 当所述选择 开关连通第一路时, 所述第三音频端子与所述高清视频 /音频收发器的控制 总线相耦合, 当所述选择开关连通第二路时, 所述第三音频端子和所述音 频输出模块的第二声道输出端相耦合。
18. 如权利要求 13至 17任一项所述的多用途连接器, 其特征在于: 所述 多用途连接器还包括一物理开关, 所述物理开关用于控制所述选择开关在 第一路和第二路之间切换。
19. 如权利要求 13至 17任一项所述的手持电子设备, 其特征在于:
所述多用途连接器还包括***检测模块, 所述***检测模块的输出端 与一主控单元相耦合, 所述***检测模块用于当有插头***所述耳机连接 器时, 输出***检测信号;
所述主控单元与一输入装置的输出端相耦合, 并与一输出装置的输入 端相耦合, 以及与所述选择开关相耦合;
所述输入装置用于接收用户的输入的选择, 当所述输入的选择指示所 述选择开关连通所述第一路时, 输出第一选择信号, 当所述输入的选择指 示所述选择开关连通所述第二路时, 输出第二选择信号;
所述主控单元用于在所述***检测信号的触发下控制所述输出装置提示用 户选择所述选择开关连通所述第一路或所述第二路, 以及, 根据所述第一 选择信号, 控制所述选择开关连通所述第一路, 根据所述第二选择信号, 控制所述选择开关连通所述第二路。
20. 如权利要求 19所述的手持电子设备, 其特征在于:
所述耳机连接器还包括接地端子和***检测引脚, 所述***检测引脚 在无插头***所述耳机连接器时搭接在所述接地端子上, 当有插头***时 则与接地端子断开连接, 所述***检测弓 I脚上加有第一偏置电压; 所述检测信号输出模块的输入端与所述***检测弓 I脚相耦合; 所述检测信号输出模块用于当第一电位与所述第一偏置电压的差值的绝对 值小于或等于第一阈值时, 输出***检测信号, 所述第一电位为第一耦合 点的电位, 所述第一耦合点为所述检测信号输出模块的输入端与所述*** 检测引脚的耦合点。
21. 如权利要求 16或 17所述的手持电子设备, 其特征在于:
所述耳机连接器还包括接地端子, 所述多用途连接器还包括检测信号 输出模块, 所述检测信号输出模块的输入端与所述第二音频端子相耦合, 所述检测信号输出模块的输出端与一主控单元相耦合, 所述主控单元与所 述选择开关相耦合;
所述检测信号输出模块用于当所述第二音频端子上的阻抗为第一阻抗 时, 输出视频检测信号, 以及, 当所述第二音频端子上的阻抗为第二阻抗 时, 输出耳才 1全测信号;
所述主控单元用于根据所述视频检测信号控制所述选择开关连通所述 第一路, 以及, 根据所述耳机检测信号控制所述选择开关连通所述第二路。
22. 如权利要求 21所述的手持电子设备, 其特征在于:
所述第二音频端子上加有第二偏置电压, 所述第二偏置电压与第二耦 合点之间串接有第一电阻, 所述第二耦合点为所述检测信号输出模块的输 入端与所述第二音频端子的耦合点;
所述检测信号模块具体用于当第二电位与所述第二偏置电压的差值的 绝对值大于或等于第二阈值时输出第一路检测信号, 当所述第二电位与所 述第二偏置电压的差值的绝对值小于所述第二阈值时输出第二路检测信 所述第二电位为所述第二耦合点的电位。
23. 如权利要求 21所述的手持电子设备, 其特征在于:
所述第二音频端子上加有第二偏置电压, 所述第二偏置电压与第二耦 合点之间串接有第一电阻, 所述第二耦合点为所述检测信号输出模块的输 入端与所述第二音频端子的耦合点;
所述检测信号模块具体用于当第二电位与所述第二偏置电压的差值的 绝对值小于或等于第三阈值时输出第一路检测信号, 当所述第二电位与所 述第二偏置电压的差值的绝对值大于所述第三阈值时输出第二路检测信 所述第二电位为所述第二耦合点的电位。
24. 如权利要求 13至 23任一项所述的手持电子设备, 其特征在于: 所述 高清视频 /音频收发器为移动高清连接 MHL收发器。
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US9374642B2 (en) | 2016-06-21 |
EP2728899A2 (en) | 2014-05-07 |
US20140105432A1 (en) | 2014-04-17 |
JP5975360B2 (ja) | 2016-08-23 |
JP2015501511A (ja) | 2015-01-15 |
EP2728899A4 (en) | 2014-09-03 |
CN103222279A (zh) | 2013-07-24 |
CN103222279B (zh) | 2016-10-12 |
WO2012097615A3 (zh) | 2012-09-13 |
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