WO2016060104A1 - 送信装置、送信方法、受信装置および受信方法 - Google Patents
送信装置、送信方法、受信装置および受信方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/14—Multichannel or multilink protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/06—Systems for the simultaneous transmission of one television signal, i.e. both picture and sound, by more than one carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
Definitions
- the present invention relates to a transmission apparatus, a transmission method, a reception apparatus, and a reception method, and more particularly to a transmission apparatus that transmits a digital signal such as video via a transmission line using a differential signal.
- HDMI High Definition Multimedia Interface
- CE Consumer Electronics
- the value determined in the HDMI standard as the transmission speed of this digital signal is approximately 10.2 Gbps at the maximum. Considering that it will be compatible with future video signals of 4k2k (QFHD) and further high-definition content, it is in the future demand for HDMI to extend beyond the maximum value in current standards such as 15 Gbps and 20 Gbps.
- the purpose of this technology is to enable easy connection with lower standard equipment.
- the external device includes a digital signal transmission unit that transmits a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels.
- the digital signal transmitter is A second coding that transmits a digital signal that has been subjected to a first coding that cannot be extracted in a part of the plurality of channels, and that can extract a clock in another channel of the plurality of channels. It is in the transmitter that transmits the applied digital signal.
- the digital signal transmitting unit transmits a digital signal that has been subjected to coding to the external device via a transmission path using a plurality of channels and a differential signal.
- the second coding in which the digital signal subjected to the first coding that cannot be clock-extracted in a part of the plurality of channels is transmitted and the clock can be extracted in the other channel of the plurality of channels.
- a digital signal subjected to is transmitted.
- the first coding may be TMDS coding.
- both the first coding and the second coding may be 8-bit / 10-bit conversion coding.
- the transmission path may be an HDMI cable, the number of channels of some channels may be 3, and the number of channels of other channels may be 3.
- a digital signal subjected to the first coding that cannot be extracted in a part of a plurality of channels is transmitted, and a clock can be extracted in another part of the plurality of channels.
- a digital signal subjected to the second coding is transmitted. Therefore, it becomes possible to easily connect to a lower standard device that handles the digital signal subjected to the first coding. In other words, even when it is configured to be connectable to the lower standard equipment, it is not necessary to separately implement the first coding.
- a digital signal receiving unit that receives a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels from an external device
- the digital signal receiver is A second coding that receives a digital signal that has been subjected to a first coding that cannot be extracted in a part of the plurality of channels and that can extract a clock in another part of the plurality of channels is performed.
- Receive the applied digital signal The receiving apparatus further includes a processing unit that processes the digital signals received on the plurality of channels based on a clock extracted from the digital signal received on any one of the other channels.
- the digital signal receiving unit receives a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels from an external device.
- the second coding in which the digital signal subjected to the first coding that cannot be clock-extracted in a part of the plurality of channels is received and the clock can be extracted in the other channel of the plurality of channels.
- a digital signal subjected to is received.
- the processing unit processes the digital signals received on the plurality of channels based on the clock extracted from the digital signals received on any one of the other channels.
- digital signals received through a plurality of channels are processed based on a clock extracted from a digital signal received through any one of the other channels. Therefore, digital signals received on some of the plurality of channels can be processed well without requiring reception of a clock.
- the external device includes a digital signal transmission unit that transmits a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels.
- the digital signal transmission unit selects one of the first mode and the second mode to transmit the digital signal,
- the first mode transmits a digital signal that has been subjected to the first coding that cannot be extracted by a predetermined number of first channels, and is capable of performing clock extraction by a predetermined number of second channels.
- 2 is a mode for transmitting a digital signal encoded with 2;
- the digital signal subjected to the first coding is transmitted on the predetermined number of first channels, and 1 corresponding to any one of the predetermined number of second channels is transmitted.
- the digital signal transmitting unit transmits a digital signal that has been subjected to coding to the external device via a transmission path using a plurality of channels and a differential signal.
- the digital signal transmission unit one of the first mode and the second mode is selected, and the digital signal is transmitted.
- a digital signal that has been subjected to the first coding that cannot be clock-extracted by a predetermined number of first channels is transmitted, and a clock signal that can be clock-extracted by a predetermined number of second channels is transmitted.
- a digital signal subjected to the coding of 2 is transmitted.
- a digital signal subjected to the first coding in a predetermined number of first channels is transmitted, and one third corresponding to any one of the predetermined number of second channels is transmitted.
- the clock is transmitted on the channels.
- the first coding may be TMDS coding.
- the first coding and the second coding may both be 8-bit / 10-bit conversion coding.
- the transmission path may be an HDMI cable
- the number of channels of the first channel may be 3
- the number of channels of the second channel may be 3.
- one of the first mode and the second mode is selected, and the digital signal is transmitted. Therefore, by selecting the first mode, signal transmission at a high data rate is possible, and by selecting the second mode, it is possible to communicate with a lower standard device that handles a digital signal subjected to the first coding. Connection is possible.
- a mode determination unit that determines whether or not the external device and the transmission path correspond to the first mode, and mode selection in the digital signal transmission unit based on the determination of the mode determination unit. It may be made to further be provided with a control part which controls. In this case, transmission in the first mode is performed only when the external device and the transmission path are compatible with the first mode, and it is possible to avoid erroneous signal transmission.
- each of the predetermined number of second channels except for one channel corresponding to the third channel may be AC-coupled to the transmission path. Good. Such AC coupling is advantageous for high-speed operation and secures superiority over other channels.
- a digital signal receiving unit that receives a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels from an external device, The digital signal receiving unit selects one of the first mode and the second mode to receive the digital signal,
- the first mode receives a digital signal that has been subjected to a first coding that cannot be extracted by a predetermined number of first channels, and is capable of performing clock extraction by a predetermined number of second channels.
- 2 is a mode for receiving a digital signal encoded with 2; In the second mode, the digital signal subjected to the first coding is received by the predetermined number of first channels, and 1 corresponding to any one of the predetermined number of second channels.
- a mode to receive the clock on one third channel In the first mode, digital signals received on the predetermined number of first channels and the predetermined number of second channels are received on any one of the predetermined number of second channels. Processing based on the clock extracted from the digital signal. In the second mode, the digital signal received on the predetermined number of first channels is processed based on the clock received on the third channel.
- the receiving apparatus further includes a processing unit.
- the digital signal receiving unit receives a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels from an external device.
- the digital signal receiving unit one of the first mode and the second mode is selected and the digital signal is received.
- a digital signal that has been subjected to the first coding that cannot be clock-extracted by a predetermined number of first channels is received, and a clock signal that can be clock-extracted by a predetermined number of second channels is received.
- a digital signal subjected to the coding of 2 is received.
- a digital signal subjected to the first coding in a predetermined number of first channels is received, and one third signal corresponding to any one of the predetermined number of second channels is received.
- the clock is received on the other channel.
- the processing unit has received a digital signal received on a predetermined number of first channels and a predetermined number of second channels on any one of the predetermined number of second channels. Processing is based on the clock extracted from the digital signal. Further, in the second mode, the processing unit processes the digital signal received on the predetermined number of first channels based on the clock received on the third channel.
- the first coding and the second coding may both be 8-bit / 10-bit conversion coding.
- the transmission path may be an HDMI cable
- the number of channels of the first channel may be 3
- the number of channels of the second channel may be 3.
- one of the first mode and the second mode is selected, and the digital signal is received. Therefore, by selecting the first mode, signal transmission at a high data rate is possible, and by selecting the second mode, it is possible to communicate with a lower standard device that handles a digital signal subjected to the first coding. Connection is possible.
- each of the predetermined number of second channels except for one channel corresponding to the third channel may be AC-coupled to the transmission line. Good. Such AC coupling is advantageous for high-speed operation and secures superiority over other channels.
- a control unit that controls mode selection in the digital signal transmission unit may be further provided based on control information transmitted from an external device.
- control information transmitted from an external device since the mode selection corresponding to the mode selection in the external device is performed, it is possible to appropriately receive the digital signal transmitted from the external device.
- FIG. 1 is a block diagram showing a configuration example of an AV system as an embodiment of the present invention. It is a figure which shows the example of a combination of a source device, an HDMI cable, and a sink device. It is a figure which shows the structural example (at the time of the operation mode of the present HDMI) of the data transmission part of a source device, and the data reception part of a sink device. It is a figure which shows the structural example (at the time of the operation mode of new HDMI) of the data transmitter of a source device, and the data receiver of a sink device. It is a block diagram which shows the structural example of an HDMI transmitter. It is a block diagram which shows the structural example of an HDMI receiver. It is a figure which shows the structural example of TMDS transmission data.
- FIG. 1 shows a configuration example of an AV (Audio and Visual) system 100 as an embodiment.
- the AV system 100 is configured by connecting a source device 110 and a sink device 120.
- the source device 110 is an AV source such as a game machine, a disc player, a set top box, a digital camera, or a mobile phone.
- the sink device 120 is, for example, a television receiver or a projector.
- the source device 110 and the sink device 120 are connected via a cable 200.
- the source device 110 is provided with a receptacle 111 constituting a connector, to which a data transmission unit 112 is connected.
- the sink device 120 is provided with a receptacle 121 constituting a connector, to which a data receiving unit 122 is connected.
- a plug 201 constituting a connector is provided at one end of the cable 200, and a plug 202 constituting a connector is provided at the other end.
- the plug 201 at one end of the cable 200 is connected to the receptacle 111 of the source device 110, and the plug 202 at the other end of the cable 200 is connected to the receptacle 121 of the sink device 120.
- the source device 110 has a control unit 113.
- the control unit 113 controls the entire source device 110.
- the data transmission unit 112 of the source device 110 supports both current HDMI and new HDMI.
- the control unit 113 controls the data transmission unit 112 to operate in the operation mode of the new HDMI.
- the control unit 113 determines that at least the sink device 120 supports only the current HDMI, or determines that the cable 200 supports the current HDMI, the control unit 113 sets the data transmission unit 112 to the current HDMI. Control to operate in operation mode.
- the sink device 120 has a control unit 123.
- the control unit 123 controls the entire sink device 120.
- the data receiving unit 122 of the sink device 120 supports only the current HDMI or both the current HDMI and the new HDMI.
- the control unit 123 controls the data receiving unit 122 to operate in the same operation mode as the data transmitting unit 112 of the source device 110. .
- the control unit 123 controls the operation mode of the data reception unit 122 based on the determination result of the operation mode transmitted from the source device 110 through a line such as CEC.
- the cable 200 is compatible with current HDMI or new HDMI.
- the cable 200 supports the current HDMI, or the sink device 120 supports only the current HDMI.
- Data transmission with the current HDMI is performed.
- the data transmission unit 112 of the source device 110 is controlled to operate in the current HDMI operation mode.
- the data reception unit 122 of the sink device 120 that supports both the current HDMI and the new HDMI is controlled to operate in the current HDMI operation mode.
- data transmission in the new HDMI mode may be performed when the cable 200 is capable of data transmission of the new HDMI, for example, by lowering the data transfer rate.
- [Configuration example of data transmitter and data receiver] 3 and 4 show configuration examples of the data transmission unit 112 of the source device 110 and the data reception unit 122 of the sink device 120 in the AV system 100 of FIG.
- the data transmission unit 112 transmits a differential signal corresponding to uncompressed video data for one screen to the data reception unit 122 in one direction in a plurality of channels in an effective image period (also referred to as “active video period”). Send.
- the effective image section is a section obtained by removing the horizontal blanking section and the vertical blanking section from the section from one vertical synchronizing signal to the next vertical synchronizing signal.
- the data transmission unit 112 transmits at least a plurality of channels of differential signals corresponding to audio data, control data, and other auxiliary data associated with video data in a horizontal blanking interval or a vertical blanking interval. Transmit to the receiving unit 122 in one direction.
- the data receiving unit 122 receives a differential signal corresponding to video data transmitted in one direction from the data transmitting unit 122 through a plurality of channels in the active video section. In addition, the data reception unit 122 receives differential signals corresponding to audio data and control data transmitted in one direction from the data transmission unit 112 through a plurality of channels in a horizontal blanking interval or a vertical blanking interval. Receive.
- the transmission channel of the HDMI system including the data transmission unit 112 and the data reception unit 122 includes the following. First, there is a differential signal channel as a transmission channel.
- the differential signal channels for transmitting digital signals such as video data are 3 channels in the current HDMI, but 6 channels in the new HDMI.
- the differential signal channel in the current HDMI operation mode will be described.
- three TMDSs serving as transmission channels for serially transmitting video data and audio data in one direction in synchronization with the pixel clock from the data transmission unit 112 to the data reception unit 122.
- Each of these channels is DC coupled to the cable 200.
- the HDMI transmitter 81 of the data transmission unit 112 converts, for example, uncompressed video data into a corresponding differential signal after performing TMDS coding, and uses three TMDS channels # 0, # 1, and # 2 to transmit the cable 200. Is serially transmitted in one direction to the data receiving unit 122 connected via the. Also, the HDMI transmitter 81 converts the audio data accompanying the uncompressed video data, necessary control data and other auxiliary data, etc. into a corresponding differential signal after TMDS coding, and converts the three TMDS channels # 0. , # 1, # 2 serially transmit to the data receiving unit 122 in one direction.
- the HDMI transmitter 81 uses TMDS clock channels to connect TMDS clocks (pixel clocks) synchronized with video data transmitted via the three TMDS channels # 0, # 1, and # 2 to the data connected via the cable 200. Transmit to the receiver 122.
- TMDS coding is 8-bit / 10-bit conversion coding for converting 8-bit data into 10-bit data, and the adverse effects such as unnecessary radiation are suppressed by reducing the number of transition points from the comparison with the previous data.
- the above coding is to maintain DC balance. Therefore, theoretically, the run length of coding cannot be guaranteed, so DC coupling and separate clock transmission are essential.
- the HDMI receiver 82 of the data reception unit 122 transmits a differential signal corresponding to video data, audio data, and control data transmitted in one direction from the data transmission unit 112 through TMDS channels # 0, # 1, and # 2.
- a differential signal corresponding to is received.
- reception is performed in synchronization with the TMDS clock (pixel clock) transmitted from the data transmission unit 112 via the TMDS clock channel.
- TMDS as transmission channels for serially transmitting video data and audio data in one direction in synchronization with the pixel clock from the data transmission unit 112 to the data reception unit 122.
- channels # 0 to # 5 There are channels # 0 to # 5.
- the transmission of the TMDS clock is omitted, and a self-clock method is used in which the clock is reproduced from the received data on the receiving side.
- TMDS channels # 0, # 1, and # 2 correspond to TMDS channels # 0, # 1, and # 2 in the above-described current HDMI operation mode.
- the TMDS channel # 3 corresponds to the TMDS clock channel in the above-described current HDMI operation mode. That is, these four channels are used in common in the current HDMI operation mode and the new HDMI operation mode. These four channels are DC-coupled to the cable 200 as described above, but the TMDS channels # 4 and # 5 are AC-coupled to the cable 200, and an advantage for high-speed operation is ensured.
- the HDMI transmitter 81 of the data transmission unit 112 converts, for example, uncompressed video data into corresponding differential signals, and is a data reception unit connected via the cable 200 with six TMDS channels # 0 to # 5. In 122, serial transmission is performed in one direction.
- the HDMI transmitter 81 converts audio data associated with uncompressed video data, necessary control data and other auxiliary data into corresponding differential signals, and uses six TMDS channels # 0 to # 5. Serial transmission is performed in one direction to the data receiving unit 122.
- the HDMI transmitter 81 performs TMDS coding on the data transmitted on the TMDS channels # 0, # 1, and # 2, but can extract the clock on the data transmitted on the TMDS channels # 3, # 4, and # 5.
- ANSI 8B10B coding is applied.
- the ANSI 8B10B coding is an 8-bit / 10-bit conversion coding similar to the TMDS coding.
- This ANSI 8B10B coding not only recognizes each 8-bit data boundary from transmission data by inserting a certain pattern as appropriate, but also enables direct extraction of the transmission clock.
- ANSI 8B10B coding is run-length guaranteed, is completely DC free coding, and can be an AC coupled differential signal.
- the HDMI receiver 82 of the data receiver 122 corresponds to differential signals corresponding to video data, audio data, and control data transmitted in one direction from the data transmitter 112 via TMDS channels # 0 to # 5. Receive differential signals.
- the HDMI receiver 82 extracts a clock from the reception data of the TMDS channel # 4 or # 5, in this embodiment, the TMDS channel # 5, and synchronizes with the TMDS channel # 0 to # 5. 5 data is received.
- transmission channels of the HDMI system include transmission channels called DDC (Display Data Channel) and CEC lines in addition to the above-described TMDS channel and TMDS clock channel.
- the DDC includes two signal lines (not shown) included in the cable 200.
- the DDC is used by the data transmitter 112 to read E-EDID (Enhanced Extended Display Identification Data) from the data receiver 122.
- E-EDID Enhanced Extended Display Identification Data
- the data receiving unit 122 has an EDID ROM (EEPROM) that stores E-EDID that is capability information related to its capability (Configuration / capability).
- E-EDID ROM EEPROM
- the data transmission unit 112 reads the E-EDID from the data reception unit 122 connected via the cable 200 via the DDC.
- the data transmission unit 112 sends the read E-EDID to the control unit 113.
- the control unit 113 stores this E-EDID in a flash ROM or DRAM (not shown).
- the control unit 113 can recognize the setting of the capability of the data receiving unit 122 based on the E-EDID. For example, the control unit 113 recognizes whether or not the sink device 120 including the data receiving unit 122 is compatible with new HDMI in addition to the current HDMI.
- the CEC line is composed of one signal line (not shown) included in the cable 200, and is used for bidirectional communication of control data between the data transmission unit 112 and the data reception unit 122.
- the cable 200 includes a line (HPD line) connected to a pin called HPD (Hot Plug Detect).
- HPD Hot Plug Detect
- the source device can detect the connection of the sink device using the HPD line.
- This HPD line is also used as a HEAC-line constituting a bidirectional communication path.
- the cable 200 includes a power line (+ 5V Power Line) used for supplying power from the source device to the sink device.
- the cable 200 includes a utility line. This utility line is also used as a HEAC + line constituting a bidirectional communication path.
- FIG. 5 shows a configuration example of the HDMI transmitter 81.
- the HDMI transmitter 81 includes a 6-lane (6-channel) mapper 11, a TMDS encoder 12, changeover switches 13 and 14, an 8B10B encoder 15, a multiplier 16, and a changeover switch 17.
- the mapper 11 performs mapping processing on input video data, packetized audio data and control data, and vertical and horizontal synchronization signals, and data channels # 0, # 1, # 2, # 3, and # 3. Outputs data # 4 and # 5. Further, the mapper 11 outputs the input pick cell clock as a TMDS clock.
- the TMDS encoder 12 subjects the data of the data channels # 0, # 1, and # 2 output from the mapper 11 to TMDS encoding in synchronization with the TMDS clock output from the mapper 11, and outputs TMDS channels # 0, # 2,. The transmission data of # 1 and # 2 are obtained.
- the 8B10B encoder 15 performs the encoding process of ANSI 8B10B coding on the data of the data channels # 3, # 4, and # 5 output from the mapper 11.
- the changeover switch 13 switches between the data of the data channel # 4 output from the 8B10B encoder 15 and the ground and outputs the data.
- the changeover switch 13 is controlled to be switched based on the changeover control signal SWC, and outputs the ground in the current HDMI operation mode and outputs the data of the data channel # 4 in the new HDMI operation mode.
- the changeover switch 14 selectively switches the data of the data channel # 5 output from the 8B10B encoder 15 and the ground and outputs the data.
- the changeover switch 14 is controlled to be changed based on the changeover control signal SWC, and outputs the ground in the current HDMI operation mode and outputs the data of the data channel # 5 in the new HDMI operation mode.
- the multiplier 16 multiplies the input pixel clock by 10 to generate a bit clock, and supplies the bit clock to the 8B10B encoder 15.
- the changeover switch 17 selectively switches between the coding result of the data channel # 3 output from the 8B10B encoder 15 and the TMDS clock to obtain transmission data of the TMDS channel # 3 (TMDS clock channel).
- the changeover switch 17 is controlled to be changed based on the changeover control signal SWC, outputs a TMDS clock in the current HDMI operation mode, and outputs a coding result of the data channel # 3 in the new HDMI operation mode.
- the operation of the HDMI transmitter 81 shown in FIG. 5 will be described. First, the operation in the current HDMI operation mode will be described. From the mapper 11, the data of the data channels # 0, # 1, and # 2 and the TMDS clock are obtained. The data channels # 0, # 1, # 2 are supplied to the TMDS encoder 12.
- TMDS encoder 12 TMDS coding encoding processing is performed on the data of the data channels # 0, # 1, and # 2 in synchronization with the TMDS clock, and the transmission data of the TMDS channels # 0, # 1, and # 2 is received. can get. Further, the TMDS clock output from the mapper 11 becomes transmission data of the TMDS clock channel (TMDS channel # 3) through the changeover switch 17.
- the data of data channels # 3, # 4, and # 5 are supplied to the 8B10B encoder 15.
- the data of the data channels # 3, # 4, and # 5 are subjected to the encoding process of ANSI 8B10B coding in synchronization with the bit clock, respectively, and the transmission data of the TMDS channels # 3, # 4, and # 5 are transmitted. Is obtained.
- FIG. 6 shows a configuration example of the HDMI receiver 82.
- the data receiving unit 122 of the sink device 120 is compatible with both the current HDMI and the new HDMI.
- the HDMI receiver 82 includes a TMDS decoder 21, changeover switches 22, 23 and 24, 8B10B decoder 25, clock extractor 26, frequency divider 27, changeover switch 28, and 6-lane (6 channels) demapper 29. have.
- the TMDS decoder 21 performs decoding processing of TMDS coding on the reception data of the TMDS channels # 0, # 1, and # 2, and obtains data of the data channels # 0, # 1, and # 2.
- the changeover switch 22 distributes and outputs the received data of TMDS channel # 3 (TMDS clock channel).
- the changeover switch 22 is controlled to be changed based on the changeover control signal SWC, and outputs to the TMDS clock side in the current HDMI operation mode and to the data channel # 3 side in the new HDMI operation mode.
- Switch 23 distributes and outputs the received data of TMDS channel # 4.
- the change-over switch 23 is controlled to be changed based on the change-over control signal SWC, and outputs to the ground side in the current HDMI operation mode and to the data channel # 4 side in the new HDMI operation mode.
- the changeover switch 24 sorts and outputs the reception data of the TMDS channel # 5.
- the changeover switch 24 is controlled to be changed based on the changeover control signal SWC, and outputs to the ground side in the current HDMI operation mode and to the data channel # 5 side in the new HDMI operation mode.
- the 8B10B decoder 25 performs the decoding process of ANSI 8B10B coding on the data output to the data channels # 3, # 4, and # 5 from the changeover switches 22, 23, and 24, respectively, and the data channels # 3, # 4, # 5 data is obtained.
- the clock extractor 26 extracts a bit clock from the data output from the changeover switch 24 to the data channel # 5 side, and supplies the bit clock to the 8B10B decoder 25.
- the frequency divider 27 divides the bit clock extracted by the clock extractor by 1/10 to obtain a TMDS clock (pixel clock).
- the changeover switch 28 selectively switches between the TMDS clock (pixel clock) output from the changeover switch 22 to the TMDS clock side and the TMDS clock obtained by the frequency divider 27 and supplies the TMDS clock to the TMDS decoder 21.
- the changeover switch 28 is controlled to be changed based on the changeover control signal SWC, selects the TMDS clock output from the changeover switch 22 in the current HDMI operation mode, and is obtained by the frequency divider 27 in the new HDMI operation mode. Select the TMDS clock.
- the demapper 29 receives the data channels # 0, # 1 and # 2 obtained by the TMDS decoder 21, the TMDS clock (pixel clock) selected by the changeover switch 28, and the data channels # 3 and 3 obtained by the 8B10B decoder 25. Demapping processing is performed on the data # 4 and # 5 to obtain video data, packetized audio data and control data, vertical and horizontal synchronization signals, and a pixel clock.
- the demapper 29 performs the reverse process of the mapper 11 in the HDMI transmitter 81 of FIG.
- the operation of the HDMI receiver 82 shown in FIG. 6 will be described. First, the operation in the current HDMI operation mode will be described. In this case, data is received by the TMDS channels # 0, # 1, and # 2, and the TMDS clock is received by the TMDS channel # 3 (TMDS clock channel). The reception data of the TMDS channels # 0, # 1, and # 2 is supplied to the TMDS decoder 21.
- TMDS coding decoding processing is performed in synchronization with the TMDS clock on the received data of the TMDS channels # 0, # 1, and # 2, respectively, and the data of the data channels # 0, # 1, and # 2 is received. can get.
- the data of the data channels # 0, # 1, # 2 is supplied to the demapper 29.
- the TMDS clock received by TMDS channel # 3 (TMDS clock channel) is supplied to the demapper 29 through the changeover switches 22 and 28.
- the demapper 29 performs demapping processing on the data channel # 0, # 1, # 2 data and the TMDS clock (pixel clock), and outputs video data, packetized audio data and control data, vertical and horizontal A synchronization signal and a pixel clock are obtained.
- TMDS channels # 0, # 1, # 2, # 3, # 4, and # 5 data is received on the TMDS channels # 0, # 1, # 2, # 3, # 4, and # 5.
- the reception data of the TMDS channels # 0, # 1, and # 2 is supplied to the TMDS decoder 21.
- TMDS decoder 21 TMDS coding decoding processing is performed in synchronization with the TMDS clock on the received data of the TMDS channels # 0, # 1, and # 2, respectively, and the data of the data channels # 0, # 1, and # 2 is received. can get.
- the data of the data channels # 0, # 1, # 2 is supplied to the demapper 29.
- the received data of TMDS channels # 3, # 4, and # 5 are supplied to the 8B10B decoder 25 through the changeover switches 22, 23, and 24, respectively. Also, the reception data of TMDS channel # 5 is supplied to the clock extractor 26, and the bit clock is extracted. This bit clock is supplied to the frequency divider 27 together with the 8B10B decoder 25.
- the received data of the TMDS channels # 3, # 4, and # 5 are subjected to ANSI 8B10B coding decoding processing in synchronization with the bit clock, respectively, and the data of the data channels # 3, # 4, and # 5 Is obtained.
- the data of the data channels # 3, # 4, and # 5 is supplied to the demapper 29.
- the bit clock is divided by 1/10 to generate a TMDS clock (pixel clock).
- This TMDS clock is supplied to the TMDS decoder 21 through the changeover switch 28.
- the demapper 29 the data of the data channels # 0, # 1, # 2, # 3, # 4, and # 5 and the TMDS clock (pixel clock) are subjected to demapping processing, and video data and packetized audio are processed. Data, control data, vertical and horizontal synchronization signals, and pixel clock are obtained.
- FIG. 7 shows an example of the structure of TMDS transmission data.
- FIG. 7 shows sections of various transmission data when image data of horizontal x vertical B pixels x A lines is transmitted in TMDS channels # 0 to # 2 or TMDS channels # 0 to # 5. ing.
- Video Field There are three types of sections in the video field (Video Field) in which transmission data is transmitted using the HDMI TMDS channel, depending on the type of transmission data. These three types of sections are a video data period (Video Data period), a data island period (Data Island period), and a control period (Control period).
- the video field period is a period from the rising edge (active edge) of a certain vertical synchronizing signal to the rising edge of the next vertical synchronizing signal.
- This video field section is divided into a horizontal blanking period (horizontal blanking), a vertical blanking period (vertical blanking), and an active video section (Active Video).
- a video data section that is a section obtained by removing the horizontal blanking period and the vertical blanking period from the video field section is assigned to the active video section.
- B pixel (pixel) ⁇ A line effective pixel (Active pixel) data constituting uncompressed image data for one screen is transmitted.
- Data island section and control section are assigned to horizontal blanking period and vertical blanking period.
- auxiliary data (Auxiliary data) is transmitted. That is, the data island period is assigned to a part of the horizontal blanking period and the vertical blanking period. In this data island period, for example, audio data packets that are not related to the control among the auxiliary data are transmitted.
- the control period is allocated to other parts of the horizontal blanking period and the vertical blanking period. In this control period, for example, vertical synchronization signals, horizontal synchronization signals, control packets, and the like, which are data related to control, of auxiliary data are transmitted.
- FIG. 8A shows the pin assignment of this current HDMI.
- the pins (pin numbers 7, 4, and 1) are assigned to TMDS Data # i +, and the pins (pin numbers 9, 6, and 3) are assigned to TMDS Data # i-.
- TMDS Clock + and TMDS Clock- which are differential signals of TMDS clock channel, are transmitted by two lines which are differential lines.
- the pin with pin number 10 is assigned to TMDS Clock +, and the pin with pin number 12 is assigned to TMDS Clock-. Note that the pin with the pin number 11 is assigned to TMDS Clock Shield.
- the CEC signal which is control data
- the pin with the pin number 13 is assigned to the CEC signal.
- An SDA (Serial Data) signal used for E-EDID reading or the like is transmitted through the SDA line.
- a pin having a pin number of 16 is assigned to the SDA signal.
- an SCL (Serial) Clock) signal which is a clock signal used for synchronization during transmission / reception of the SDA signal, is transmitted through the SCL line.
- a pin with a pin number of 15 is assigned to the SCL.
- the DDC line described above is composed of an SDA line and an SCL line.
- the pin with pin number 19 is assigned to HPD / HEAC-.
- a pin with pin number 14 is assigned to utility / HEAC +.
- a pin with a pin number of 17 is assigned to DDC / CEC Ground / HEAC Shield.
- the pin with the pin number 18 is assigned to the power supply (+ 5V Power).
- FIG. 8B shows a pin assignment of this new HDMI.
- Pins pin numbers 7, 4, 1, 10, 8, and 2 are assigned to TMDS Data # i +, and pins (pin numbers 9, 6, 3, 12, 11, and 5) are TMDS Data Assigned to # i-.
- the CEC signal which is control data
- the pin with the pin number 13 is assigned to the CEC signal.
- An SDA (Serial Data) signal used for E-EDID reading or the like is transmitted through the SDA line.
- a pin having a pin number of 16 is assigned to the SDA signal.
- an SCL (Serial) Clock) signal which is a clock signal used for synchronization during transmission / reception of the SDA signal, is transmitted through the SCL line.
- a pin with a pin number of 15 is assigned to the SCL.
- the DDC line described above is composed of an SDA line and an SCL line.
- the pin with pin number 19 is assigned to HPD / HEAC-.
- a pin with pin number 14 is assigned to utility / HEAC +.
- a pin with a pin number of 17 is assigned to DDC / CEC Ground / HEAC Shield.
- the pin with the pin number 18 is assigned to the power supply (+ 5V Power).
- terminals pin numbers 2, 5, and 5 used as shield terminals in the current HDMI pin assignment (see FIG. 8A). 8 and 11 pins) are used as data terminals.
- a terminal pin numbers 10 and 12 used as a signal terminal of a differential signal of a clock signal in the current HDMI pin assignment is used as a data terminal.
- the data transmission unit 112 of the source device 110 selects the current HDMI pin assignment shown in FIG. 8A, and when operating in the new HDMI operation mode, the data transmission unit 112 in FIG.
- the new HDMI pin assignment shown in FIG. In the above description, the pin assignment of the receptacle 111 of the source device 110 has been described. Although the detailed description is omitted, the same applies to the pin assignment of the receptacle 121 of the sink device 120 when the data receiving unit 122 of the sink device 120 supports both the current HDMI and the new HDMI.
- FIGS. 9A and 9B show the pin arrangement of the receptacle 111 of the source device 110.
- FIG. FIG. 9A shows the pin arrangement of the current HDMI
- FIG. 9B shows the pin arrangement of the new HDMI.
- the pins with the pin numbers 2, 5, 8, and 11 are grounded in the source device 110 and the sink device 120, or the sink device.
- the ground state is set at 120
- the high impedance state is set at the source device 110
- the high impedance state is set at the sink device 120
- the ground state is set at the source device 110.
- FIG. 10A shows an example of the structure of the current HDMI cable used as the cable 200.
- This current HDMI cable is configured as a shielded twisted pair portion so that each of the three data line pairs can obtain characteristics.
- the clock line pair and the utility and HPD line pair for the HEAC function are also configured as a shield twist pair.
- FIG. 10B shows an example of the structure of the shield twisted pair portion.
- the shield twisted pair portion has a structure in which two electric wires 3 and a drain wire 4 are covered with a shield member 5.
- the electric wire 3 is configured such that the core wire 1 is covered with a covering portion 2.
- each drain line is connected to a pin (terminal) corresponding to each shield terminal (shield pin having pin numbers 2, 5, 8, and 11) of the above-described receptacle (current HDMI pin arrangement).
- shield terminals are grounded at the source device 110 and the sink device 120.
- the drain lines constituting the shield twisted pair portions of the data and the clock are grounded when the plug is connected to the receptacle (current HDMI pin arrangement).
- FIG. 11 shows a structure example of a new HDMI cable used as the cable 200.
- This new HDMI cable is configured as a shielded twisted pair portion so that each of the six data line pairs can obtain characteristics.
- the utility and HPD line pairs are also configured as shield twisted pairs.
- the number of individual copper wires to be connected is increased compared to the current HDMI cable (see FIG. 10A).
- the drain wire constituting each shield twisted pair connected by the dedicated pins of the plug at both ends of the cable is connected to the metal shell of the plug.
- the shielding pins are opened, and an increase in the number of necessary pins of the plug is avoided, and the plug in the new HDMI cable is the same as the plug of the current HDMI cable.
- the drain wire constituting each shield twisted pair portion is connected to the metal shell of the plug, the receptacle shell into which the plug is inserted is connected to the ground level, so that the differential A pair line shield can be secured.
- control unit 113 of the source device 110 controls the data transmission unit 112 to the operation mode of the new HDMI. In other cases, the control unit 113 controls the data transmission unit 112 to the current HDMI operation mode.
- the flowchart of FIG. 12 shows the processing procedure of the operation mode control of the control unit 113.
- the control unit 113 starts processing, and then proceeds to processing in step ST2.
- the control unit 113 determines whether or not the source device 110, that is, the data transmission unit 112 is compatible with the new HDMI. Since the control unit 113 includes in advance capability information of the source device 110 (data transmission unit 112) in which the control unit 113 exists, this determination can be easily performed. In this embodiment, since it is clear that the source device 110 is compatible with the new HDMI, the control unit 113 may omit the determination process in step ST2.
- the control unit 113 determines whether the sink device 120, that is, the data receiving unit 122 is compatible with the new HDMI, in step ST3. Details of this determination will be described later.
- the control unit 113 proceeds to the process of step ST4. In step ST4, the control unit 113 determines whether or not the cable 200 is compatible with the new HDMI. Details of this determination will be described later.
- step ST5 the control unit 113 controls the data transmission unit 112 to operate in the new HDMI operation mode.
- step ST6 the control unit 113 controls the data transmission unit 112 to operate in the current HDMI operation mode.
- the control unit 113 transmits the final operation mode determination result to the sink device 120 via the cable 200.
- the determination result is transmitted, for example, through a line such as a CEC line before data transmission from the source device 110.
- the control unit 123 controls the data reception unit 122 to operate in the same operation mode as the data transmission unit 112 of the source device 110. .
- a UI screen indicating that is displayed for example, as shown in FIG. You may control to display on a part (display). From this UI screen, the user can easily grasp that the source device 110 and the sink device 120 are connected by the new HDMI.
- the display unit (display) on which the UI screen is displayed is a display unit (display) (not shown) provided in the source device 110 or a display unit (display) (not shown) provided in the sink device 120. The same applies to the following UI displays.
- control unit 113 determines in step ST4 that the cable 200 does not support the new HDMI and moves to the process in step ST6, a UI screen indicating that is shown in FIG. 13C, for example.
- it may be controlled to display on a display unit (display).
- display the user can easily recognize that the source device 110 and the sink device 120 are compatible with the new HDMI, but only the cable 200 is not compatible with the new HDMI. You can take measures such as replacing the
- step ST4 when the control unit 113 determines in step ST4 that the cable 200 is compatible with the new HDMI, the control unit 113 immediately proceeds to step ST5, and the data transmission unit 112 operates the new HDMI. Control to operate in mode. However, when the control unit 113 determines in advance in step ST4 that the cable 200 is compatible with the new HDMI by exchanging commands through a line such as CEC in advance before data transmission, the control unit 113 notifies the user of the new HDMI or the current HDMI. (Conventional HDMI) may be selected.
- control unit 113 controls the UI screen for that purpose to be displayed on the display unit (display) as shown in FIG. 13B, for example.
- the user selects either new HDMI or current HDMI based on this UI screen.
- FIG. 13B shows a state where “new HDMI” is selected.
- the control unit 113 controls the data transmission unit 112 to operate in the new HDMI or current HDMI operation mode according to the user's selection.
- the flowchart of FIG. 14 shows a processing procedure of operation mode control of the control unit 113 in that case. 14, parts corresponding to those in FIG. 12 are given the same reference numerals, and detailed description thereof is omitted.
- the control unit 113 determines in step ST4 that the cable 200 is compatible with the new HDMI
- the control unit 113 proceeds to the process in step ST7.
- the control unit 113 controls the display unit (display) to display a UI screen for selecting either the new HDMI or the current HDMI.
- This UI display may be transmitted as a video signal by the source device 110 through the transmission path 200, or the sink device 120 may instruct the display to be displayed by itself.
- step ST8 the control unit 113 notifies the operation of the user's remote control or the like through a line such as CEC, so that the control unit 113 determines whether the user has selected new HDMI or current HDMI.
- the control unit 113 controls the data transmission unit 112 to operate in the new HDMI operation mode.
- the control unit 113 controls the data transmission unit 112 to operate in the operation mode of the current HDMI (conventional HDMI).
- the control unit 113 determines whether or not the sink device 120 is compatible with the new HDMI based on the EDID read from the sink device 120 using the DDC line (SDA line and SCL line) of the cable 200.
- the EDID itself has a data structure defined on the format. Assume that new flag information indicating whether or not the sink device 120 is compatible with new HDMI (new transmission) is newly defined at a predetermined location of the EDID.
- FIG. 15 shows an example of flag information newly defined on EDID.
- EDID is a data structure indicating the capabilities of various sink devices 120.
- FIG. 15 shows only the bytes of the EDID related to the present invention for simplicity of explanation, and simplifies to a minimum.
- 1-bit flag information “New Rx Sink” indicating whether or not the sink device 120 supports the new HDMI is described.
- 1-bit flag information “New Cable” indicating whether or not the cable 200 is compatible with the new HDMI is newly defined in the first bit.
- the control unit 113 determines that the sink device 120 supports the new HDMI when the above-described 1-bit flag information “New“ Rx Sink ”is present in the EDID read from the sink device 120. In other words, when the sink device 120 supports only the current HDMI, the above-described 1-bit flag information “New Rx Sink” does not exist in the EDID read from the sink device 120.
- the control unit 113 performs communication with the sink device 120 through the cable 200 to determine whether or not the sink device 120 is compatible with the new HDMI. For example, the control unit 113 uses the CEC line to check whether the sink device 120 is compatible with the new HDMI on a command basis.
- control unit 113 communicates with the sink device 120 using a bidirectional communication path (HEAC function) configured by a utility line and an HPD line, and the sink device 120 supports the new HDMI. Check if it is. Further, for example, the control unit 113 exchanges some signal using an unused line, for example, a utility line until transmission becomes valid, and determines whether or not the sink device 120 supports the new HDMI. Confirm.
- HEAC function bidirectional communication path
- the new HDMI cable incorporates an LSI (Large Scale Integration) in a plug, for example.
- the sink device 120 requests the LSI to output using the CEC protocol while the HPD is dropped to L.
- the sink device 120 in this case is a sink device compatible with the new HDMI.
- the LSI sends the register value (indicating that it is compatible with the new HDMI and cable characteristic data such as a transmittable data band) to the sink device 120. Report with CEC protocol.
- the sink device 120 adds information reported from the LSI to its own EDID.
- the sink device 120 instructs the source device 110 to read the EDID by setting the HPD to H after the additional writing.
- the control unit 113 determines whether the cable 200 is compatible with the new HDMI. That is, the control unit 113 determines that the cable 200 is compatible with the new HDMI when information such as that the cable 200 is compatible with the new HDMI is included.
- the sink device 120 has been described as requesting output from the LSI using the CEC protocol.
- the source device 110 itself requests an output from the LSI using the CEC protocol, and directly receives a report of a register value (indicating that it is compatible with the new HDMI and cable characteristic data such as a transmittable data band) from the LSI. It is also possible.
- the data transmission unit 112 of the source device 110 has an operation mode of the new HDMI mode in addition to the operation mode of the current HDMI.
- the differential signal channel for transmitting digital signals such as video data is 3 channels in the current HDMI, but 6 channels in the new HDMI. Therefore, signal transmission at a high data rate becomes possible by using the new HDMI.
- the sink device 120 and the cable 200 do not support the new HDMI, the backward compatibility is ensured by using the current HDMI (conventional HDMI).
- TMDS coding is adopted as coding of TMDS channels # 0, # 1, and # 2 even in the new HDMI mode.
- the source device 110 only needs to implement TMDS coding as the TMDS channels # 0, # 1, and # 2, which can be expected to reduce the design load, and can employ coding that further reduces unnecessary radiation. It becomes possible.
- the present technology is applied to an AV system in which a source device and a sink device are connected by a digital interface of the HDMI standard.
- the present technology can be similarly applied to AV systems connected by other similar digital interfaces.
- the external device includes a digital signal transmission unit that transmits a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels.
- the digital signal transmitter is A second coding that transmits a digital signal that has been subjected to a first coding that cannot be extracted in a part of the plurality of channels, and that can extract a clock in another channel of the plurality of channels. Transmitter that transmits the applied digital signal.
- the transmission path is an HDMI cable
- the transmission apparatus according to any one of (1) to (3), wherein the number of channels of the part of the channels is 3, and the number of channels of the other part of the channel is 3.
- the digital signal transmission unit includes a digital signal transmission step of transmitting a digital signal that has been subjected to coding via a transmission path using a differential signal in a plurality of channels to an external device, In the digital signal transmission step, A second coding that transmits a digital signal that has been subjected to a first coding that cannot be extracted in a part of the plurality of channels, and that can extract a clock in another channel of the plurality of channels.
- a transmission method that transmits the applied digital signal.
- a digital signal receiving unit that receives a digital signal that has been subjected to coding through a transmission path using a differential signal in a plurality of channels from an external device,
- the digital signal receiver is A second coding that receives a digital signal that has been subjected to a first coding that cannot be extracted in a part of the plurality of channels and that can extract a clock in another part of the plurality of channels is performed.
- Receive the applied digital signal A receiving apparatus, further comprising: a processing unit that processes the digital signals received on the plurality of channels based on a clock extracted from the digital signal received on any one of the other channels.
- the digital signal receiving unit includes a digital signal receiving step of receiving a digital signal that has been subjected to coding through a transmission path using a differential signal in a plurality of channels from an external device, In the digital signal receiving step, A second coding that receives a digital signal that has been subjected to a first coding that cannot be extracted in a part of the plurality of channels and that can extract a clock in another part of the plurality of channels is performed. Receive the applied digital signal, A receiving method further comprising a processing step of processing a digital signal received by the plurality of channels based on a clock extracted from a digital signal received by any one of the other channels.
- the external device includes a digital signal transmission unit that transmits a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels, The digital signal transmission unit selects one of the first mode and the second mode to transmit the digital signal, The first mode transmits a digital signal that has been subjected to the first coding that cannot be extracted by a predetermined number of first channels, and is capable of performing clock extraction by a predetermined number of second channels.
- 2 is a mode for transmitting a digital signal encoded with 2; In the second mode, the digital signal subjected to the first coding is transmitted on the predetermined number of first channels, and 1 corresponding to any one of the predetermined number of second channels is transmitted.
- a transmission device that is a mode for transmitting a clock on one third channel.
- a mode determination unit that determines whether or not the external device and the transmission path correspond to the first mode;
- the transmission device according to (8) further including a control unit that controls mode selection in the digital signal transmission unit based on the determination of the mode determination unit.
- each channel excluding one channel corresponding to the third channel is AC-coupled to the transmission line.
- the transmitting device according to 1.
- the transmission apparatus according to any one of (8) to (11), wherein each of the first coding and the second coding is 8-bit / 10-bit conversion coding.
- the transmission path is an HDMI cable,
- the transmission apparatus according to any one of (8) to (12), wherein the number of channels of the first channel is 3, and the number of channels of the second channel is 3.
- the digital signal transmission unit includes a digital signal transmission step of transmitting the coded digital signal to the external device via a transmission path using a differential signal with a plurality of channels.
- the digital signal is transmitted by selecting one of the first mode and the second mode,
- the first mode transmits a digital signal that has been subjected to the first coding that cannot be extracted by a predetermined number of first channels, and is capable of performing clock extraction by a predetermined number of second channels.
- 2 is a mode for transmitting a digital signal encoded with 2;
- the digital signal subjected to the first coding is transmitted on the predetermined number of first channels, and 1 corresponding to any one of the predetermined number of second channels is transmitted.
- a transmission method in which a clock is transmitted on one third channel.
- a digital signal receiving unit that receives a digital signal that has been subjected to coding through a transmission path using a differential signal in a plurality of channels from an external device;
- the digital signal receiving unit selects one of the first mode and the second mode to receive the digital signal,
- the first mode receives a digital signal that has been subjected to a first coding that cannot be extracted by a predetermined number of first channels, and is capable of performing clock extraction by a predetermined number of second channels.
- 2 is a mode for receiving a digital signal encoded with 2; In the second mode, the digital signal subjected to the first coding is received by the predetermined number of first channels, and 1 corresponding to any one of the predetermined number of second channels.
- a mode to receive the clock on one third channel In the first mode, digital signals received on the predetermined number of first channels and the predetermined number of second channels are received on any one of the predetermined number of second channels. Processing based on the clock extracted from the digital signal. In the second mode, the digital signal received on the predetermined number of first channels is processed based on the clock received on the third channel.
- a receiving device further comprising a processing unit. (16) Of the predetermined number of second channels, each channel except for one channel corresponding to the third channel is AC-coupled to the transmission line. Reception according to (15) apparatus. (17) The receiving apparatus according to (15) or (16), wherein each of the first coding and the second coding is 8-bit / 10-bit conversion coding.
- the transmission line is an HDMI cable,
- the number of channels of the first channel is 3, and the number of channels of the second channel is 3.
- the receiving device according to any one of (15) to (17).
- (19) The receiving device according to any one of (15) to (18), further including a control unit that controls mode selection in the digital signal transmission unit based on control information transmitted from the external device.
- the digital signal receiving unit includes a digital signal receiving step of receiving a digital signal that has been coded through a transmission path using a differential signal in a plurality of channels from an external device, In the digital signal receiving step, the digital signal is received by selecting one of the first mode and the second mode, The first mode receives a digital signal that has been subjected to a first coding that cannot be extracted by a predetermined number of first channels, and is capable of performing clock extraction by a predetermined number of second channels. 2 is a mode for receiving a digital signal encoded with 2; In the second mode, the digital signal subjected to the first coding is received by the predetermined number of first channels, and 1 corresponding to any one of the predetermined number of second channels.
- a mode to receive the clock on one third channel In the first mode, digital signals received on the predetermined number of first channels and the predetermined number of second channels are received on any one of the predetermined number of second channels. Processing based on the clock extracted from the digital signal. In the second mode, the digital signal received on the predetermined number of first channels is processed based on the clock received on the third channel. And a receiving method.
Abstract
Description
外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信部を備え、
上記デジタル信号送信部は、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信する
送信装置にある。
外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信部を備え、
上記デジタル信号受信部は、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信し、
上記複数のチャネルで受信されたデジタル信号を、上記他部のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理する処理部をさらに備える
受信装置にある。
外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信部を備え、
上記デジタル信号送信部は、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を送信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を送信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを送信するモードである
送信装置にある。
外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信部を備え、
上記デジタル信号受信部は、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を受信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を受信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを受信するモードであり、
上記第1のモードでは、上記所定数の第1のチャネルおよび上記所定数の第2のチャネルで受信されたデジタル信号を、上記所定数の第2のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理し、上記第2のモードでは、上記所定数の第1のチャネルで受信されたデジタル信号を、上記第3のチャネルで受信されたクロックに基づいて処理する処理部をさらに備える
受信装置にある。
1.実施の形態
2.変形例
[AVシステムの構成例]
図1は、実施の形態としてのAV(Audio and Visual)システム100の構成例を示している。このAVシステム100は、ソース機器110とシンク機器120とが接続されて構成されている。ソース機器110は、例えば、ゲーム機、ディスクプレーヤ、セットトップボックス、デジタルカメラ、携帯電話などのAVソースである。シンク機器120は、例えば、テレビ受信機、プロジェクタ等である。
図3、図4は、図1のAVシステム100における、ソース機器110のデータ送信部112と、シンク機器120のデータ受信部122の構成例を示している。データ送信部112は、有効画像区間(「アクティブビデオ区間」ともいう)において、非圧縮の1画面分のビデオデータに対応する差動信号を、複数のチャネルで、データ受信部122に一方向に送信する。
次に、ソース機器110の制御部113の動作モード制御についてさらに説明する。上述したように、制御部113は、ケーブル200が新HDMIに対応し、かつシンク機器120が新HDMIに対応していると判断する場合、データ送信部112を新HDMIの動作モードに制御する。また、制御部113は、それ以外の場合、データ送信部112を現行HDMIの動作モードに制御する。
制御部113における、シンク機器120が新HDMIに対応しているか否かの判断の方法について説明する。この判断方法としては、例えば、以下の第1の判断方法および第2の判断方法がある。
制御部113は、シンク機器120からケーブル200のDDCライン(SDAラインおよびSCLライン)を用いて読み出したEDIDに基づいて、シンク機器120が新HDMIに対応しているか否かの判断を行う。EDID自体は、フォーマット上で規定されたデータ構造になっている。このEDIDの所定の場所に、新たに、シンク機器120が新HDMI(新しい伝送)に対応しているか否かを示すフラグ情報が新たに定義されるとする。
制御部113は、シンク機器120との間で、ケーブル200を通じて通信を行うことで、シンク機器120が新HDMIに対応しているか否かの判断を行う。例えば、制御部113は、CECラインを用いて、コマンドベースで、シンク機器120が新HDMIに対応しているか否かを確認する。
次に、制御部113における、ケーブル200が新HDMIに対応しているか否かの判断の方法について説明する。この判断方法としては、特開2012-250673号公報に記載されているように、種々の方法が考えられる。以下に一例を示す。
なお、上述実施の形態においては、現行HDMIにおけるビデオデータ等のデジタル信号を伝送するための差動信号チャネルが3チャネルであるのに対して、新HDMIとしてその差動信号チャネルが6チャネルであるものを示した。しかし、ビデオデータ等のデジタル信号を伝送するための差動信号チャネルの数は6チャネルに限定されるものではなく、4チャネル、5チャネル、さらには7チャネル等も考えられる。例えば、ビデオデータ等のデジタル信号を伝送するための差動信号チャネルを5チャネルとし、クロック周波数を1.2倍程度に高速化することで、6チャネルにした場合と同等のデータ転送速度を得ることが可能となる。
(1)外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信部を備え、
上記デジタル信号送信部は、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信する
送信装置。
(2)上記第1のコーディングは、TMDSコーディングである
前記(1)に記載の送信装置。
(3)上記第1のコーディングおよび上記第2のコーディングのいずれも8ビット/10ビット変換コーディングである
前記(1)または(2)に記載の送信装置。
(4)上記伝送路はHDMIケーブルであり、
上記一部のチャネルのチャネル数は3であり、上記他部のチャネルのチャネル数は3である
前記(1)から(3)のいずれかに記載の送信装置。
(5)デジタル信号送信部により、外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信ステップを有し、
上記デジタル信号送信ステップでは、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信する
送信方法。
(6)外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信部を備え、
上記デジタル信号受信部は、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信し、
上記複数のチャネルで受信されたデジタル信号を、上記他部のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理する処理部をさらに備える
受信装置。
(7)デジタル信号受信部により、外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信ステップを有し、
上記デジタル信号受信ステップでは、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信し、
上記複数のチャネルで受信されたデジタル信号を、上記他部のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理する処理ステップをさらに有する
受信方法。
(8)外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信部を備え、
上記デジタル信号送信部は、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を送信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を送信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを送信するモードである
送信装置。
(9)上記外部機器および上記伝送路が上記第1のモードに対応しているか否かを判断するモード判断部と、
上記モード判断部の判断に基づいて、上記デジタル信号送信部におけるモード選択を制御する制御部をさらに備える
前記(8)に記載の送信装置。
(10)上記所定数の第2のチャネルのうち、上記第3のチャネルに対応した1つのチャネルを除く各チャネルは、上記伝送路に対してAC結合とされる
前記(8)または(9)に記載の送信装置。
(11)上記第1のコーディングは、TMDSコーディングである
前記(8)から(10)のいずれかに記載の送信装置。
(12)上記第1のコーディングおよび上記第2のコーディングは、いずれも8ビット/10ビット変換コーディングである
前記(8)から(11)のいずれかに記載の送信装置。
(13)上記伝送路はHDMIケーブルであり、
上記第1のチャネルのチャネル数は3であり、上記第2のチャネルのチャネル数は3である
前記(8)から(12)のいずれかに記載の送信装置。
(14)デジタル信号送信部により、外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信ステップを有し、
上記デジタル信号送信ステップでは、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を送信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を送信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを送信するモードである
送信方法。
(15)外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信部を備え、
上記デジタル信号受信部は、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を受信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を受信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを受信するモードであり、
上記第1のモードでは、上記所定数の第1のチャネルおよび上記所定数の第2のチャネルで受信されたデジタル信号を、上記所定数の第2のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理し、上記第2のモードでは、上記所定数の第1のチャネルで受信されたデジタル信号を、上記第3のチャネルで受信されたクロックに基づいて処理する処理部をさらに備える
受信装置。
(16)上記所定数の第2のチャネルのうち、上記第3のチャネルに対応した1つのチャネルを除く各チャネルは、上記伝送路に対してAC結合とされる
前記(15)に記載の受信装置。
(17)上記第1のコーディングおよび上記第2のコーディングは、いずれも8ビット/10ビット変換コーディングである
前記(15)または(16)に記載の受信装置。
(18)上記伝送路はHDMIケーブルであり、
上記第1のチャネルのチャネル数は3であり、上記第2のチャネルのチャネル数は3である
前記(15)から(17)のいずれかに記載の受信装置。
(19)上記外部機器から送られてくる制御情報に基づいて、上記デジタル信号送信部におけるモード選択を制御する制御部をさらに備える
前記(15)から(18)のいずれかに記載の受信装置。
(20)デジタル信号受信部により、外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信ステップを有し、
上記デジタル信号受信ステップでは、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を受信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を受信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを受信するモードであり、
上記第1のモードでは、上記所定数の第1のチャネルおよび上記所定数の第2のチャネルで受信されたデジタル信号を、上記所定数の第2のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理し、上記第2のモードでは、上記所定数の第1のチャネルで受信されたデジタル信号を、上記第3のチャネルで受信されたクロックに基づいて処理する処理ステップをさらに有する
受信方法。
12・・・TMDSエンコーダ
13,14,17・・・切換スイッチ
15・・・8B10Bエンコーダ
16・・・逓倍器
21・・・TMDSデコーダ
22,23,24,28・・・切換スイッチ
25・・・8B10Bデコーダ
26・・・クロック抽出器
27・・・分周器
29・・・デマッパ
81・・・HDMIトランスミッタ
82・・・HDMIレシーバ
100・・・AVシステム
110・・・ソース機器
111・・・レセプタクル
112・・・データ送信部
113・・・制御部
120・・・シンク機器
121・・・レセプタクル
122・・・データ受信部
123・・・制御部
200・・・ケーブル
201,202・・・プラグ
Claims (20)
- 外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信部を備え、
上記デジタル信号送信部は、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信する
送信装置。 - 上記第1のコーディングは、TMDSコーディングである
請求項1に記載の送信装置。 - 上記第1のコーディングおよび上記第2のコーディングのいずれも8ビット/10ビット変換コーディングである
請求項1に記載の送信装置。 - 上記伝送路はHDMIケーブルであり、
上記一部のチャネルのチャネル数は3であり、上記他部のチャネルのチャネル数は3である
請求項1に記載の送信装置。 - デジタル信号送信部により、外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信ステップを有し、
上記デジタル信号送信ステップでは、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信する
送信方法。 - 外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信部を備え、
上記デジタル信号受信部は、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信し、
上記複数のチャネルで受信されたデジタル信号を、上記他部のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理する処理部をさらに備える
受信装置。 - デジタル信号受信部により、外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信ステップを有し、
上記デジタル信号受信ステップでは、
上記複数のチャネルの一部のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信し、上記複数のチャネルの他部のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信し、
上記複数のチャネルで受信されたデジタル信号を、上記他部のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理する処理ステップをさらに有する
受信方法。 - 外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信部を備え、
上記デジタル信号送信部は、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を送信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を送信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを送信するモードである
送信装置。 - 上記外部機器および上記伝送路が上記第1のモードに対応しているか否かを判断するモード判断部と、
上記モード判断部の判断に基づいて、上記デジタル信号送信部におけるモード選択を制御する制御部をさらに備える
請求項8に記載の送信装置。 - 上記所定数の第2のチャネルのうち、上記第3のチャネルに対応した1つのチャネルを除く各チャネルは、上記伝送路に対してAC結合とされる
請求項8に記載の送信装置。 - 上記第1のコーディングは、TMDSコーディングである
請求項8に記載の送信装置。 - 上記第1のコーディングおよび上記第2のコーディングは、いずれも8ビット/10ビット変換コーディングである
請求項8に記載の送信装置。 - 上記伝送路はHDMIケーブルであり、
上記第1のチャネルのチャネル数は3であり、上記第2のチャネルのチャネル数は3である
請求項8に記載の送信装置。 - デジタル信号送信部により、外部機器に、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を送信するデジタル信号送信ステップを有し、
上記デジタル信号送信ステップでは、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を送信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を送信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を送信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を送信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを送信するモードである
送信方法。 - 外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信部を備え、
上記デジタル信号受信部は、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を受信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を受信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを受信するモードであり、
上記第1のモードでは、上記所定数の第1のチャネルおよび上記所定数の第2のチャネルで受信されたデジタル信号を、上記所定数の第2のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理し、上記第2のモードでは、上記所定数の第1のチャネルで受信されたデジタル信号を、上記第3のチャネルで受信されたクロックに基づいて処理する処理部をさらに備える
受信装置。 - 上記所定数の第2のチャネルのうち、上記第3のチャネルに対応した1つのチャネルを除く各チャネルは、上記伝送路に対してAC結合とされる
請求項15に記載の受信装置。 - 上記第1のコーディングおよび上記第2のコーディングは、いずれも8ビット/10ビット変換コーディングである
請求項15に記載の受信装置。 - 上記伝送路はHDMIケーブルであり、
上記第1のチャネルのチャネル数は3であり、上記第2のチャネルのチャネル数は3である
請求項15に記載の受信装置。 - 上記外部機器から送られてくる制御情報に基づいて、上記デジタル信号送信部におけるモード選択を制御する制御部をさらに備える
請求項15に記載の受信装置。 - デジタル信号受信部により、外部機器から、複数のチャネルで、差動信号により、伝送路を介して、コーディングが施されたデジタル信号を受信するデジタル信号受信ステップを有し、
上記デジタル信号受信ステップでは、第1のモードおよび第2のモードのうちいずれかのモードを選択して上記デジタル信号を受信し、
上記第1のモードは、所定数の第1のチャネルでクロック抽出が不可能な第1のコーディングが施されたデジタル信号を受信すると共に、所定数の第2のチャネルでクロック抽出が可能な第2のコーディングが施されたデジタル信号を受信するモードであり、
上記第2のモードは、上記所定数の第1のチャネルで上記第1のコーディングが施されたデジタル信号を受信すると共に、上記所定数の第2のチャネルのうちいずれかのチャネルに対応した1つの第3のチャネルでクロックを受信するモードであり、
上記第1のモードでは、上記所定数の第1のチャネルおよび上記所定数の第2のチャネルで受信されたデジタル信号を、上記所定数の第2のチャネルのうちいずれかのチャネルで受信されたデジタル信号から抽出されたクロックに基づいて処理し、上記第2のモードでは、上記所定数の第1のチャネルで受信されたデジタル信号を、上記第3のチャネルで受信されたクロックに基づいて処理する処理ステップをさらに有する
受信方法。
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