WO2009098878A1 - 映像音声データ同期方法、映像出力機器、音声出力機器及び映像音声出力システム - Google Patents
映像音声データ同期方法、映像出力機器、音声出力機器及び映像音声出力システム Download PDFInfo
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- WO2009098878A1 WO2009098878A1 PCT/JP2009/000439 JP2009000439W WO2009098878A1 WO 2009098878 A1 WO2009098878 A1 WO 2009098878A1 JP 2009000439 W JP2009000439 W JP 2009000439W WO 2009098878 A1 WO2009098878 A1 WO 2009098878A1
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- delay amount
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- 230000005540 biological transmission Effects 0.000 claims abstract description 130
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- 230000004044 response Effects 0.000 description 6
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Classifications
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2368—Multiplexing of audio and video streams
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
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- H—ELECTRICITY
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- 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
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4341—Demultiplexing of audio and video streams
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
- G09G2370/045—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial
- G09G2370/047—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial using display data channel standard [DDC] communication
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/14—Use of low voltage differential signaling [LVDS] for display data communication
Definitions
- the present invention relates to a video / audio data synchronization method for synchronizing audio output from an audio output device and video output from the video output device in a video / audio output system including an audio output device and a video output device. .
- HDMI High-Definition Multimedia Interface
- the HDMI standard defines the CEC (Consumer Electronics Control) protocol as a protocol for transmitting control signals in both directions. If the CEC protocol is used, the control signal is relayed via a plurality of AV devices, so that the user can control the plurality of AV devices using a single remote controller. Specifically, for example, control signals are bidirectionally transmitted between a television receiver (hereinafter referred to as “TV”), an AV amplifier, and a DVD player / recorder (hereinafter referred to as “DVD recorder”). Thus, the user can operate the entire home theater including the TV, the AV amplifier, and the DVD recorder using one remote controller.
- TV television receiver
- DVD recorder DVD player / recorder
- HDMI not only has a characteristic that signal degradation does not occur due to digital transmission, but also a playback device such as a DVD recorder reads the playback capability information of the connected device, thereby outputting video data and audio data. It has a feature that the format can be adjusted to an output format that can be played back by the connected device. Further, the HDMI has a feature that illegal copying can be prevented by encrypting video data and audio data and transmitting the encrypted video data and audio data.
- HDMI transmission capability information is transmitted from a device having an HDMI input port (hereinafter referred to as “HDMI input device”) such as a TV and an AV amplifier to a connection partner device having an HDMI output port (hereinafter, “A DDC (Display Data Channel) bus that is a one-way connection to an “HDMI output device” is used.
- HDMI input device such as a TV and an AV amplifier
- a DDC (Display Data Channel) bus that is a one-way connection to an “HDMI output device” is used.
- DDC Display Data Channel
- VESA Video Electronics Standards Association
- EDID Enhanced Display Identification Data
- This EDID is data read from the HDMI input device connected to the HDMI output device via the DDC bus in response to the switching (or pulse) of the HPD (Hot Plug Detect) signal from Low to High by the HDMI input device. is there. That is, if the HPD signal is High, the HDMI output device can read the EDID of the HDMI input device.
- the video format and audio format described in EDID suggest that the TV and AV amplifier, which are HDMI input devices, have the ability to reproduce digital video data and digital audio data in that format (HPD signal). Is Low when the power of the connection partner device is off or not connected).
- the output of the video is delayed from the output of the audio, so that the synchronization between the audio and the video that must be synchronized originally, so-called lip There is a case where the sync (LipSync) shift occurs. Therefore, in the HDMI standard version 1.3a (see Non-Patent Document 1), by describing the delay amount of video and audio output processing (hereinafter simply referred to as “delay amount”) in the EDID, the output device
- delay amount the delay amount of video and audio output processing
- a video / audio data synchronization method has been disclosed that enables automatic adjustment of video output and audio output so as not to cause a synchronization shift between video and audio.
- Non-Patent Document 1 when the delay amount changes in the HDMI input device, the HDMI input device updates the information on the delay amount of EDID. Then, the HDMI output device automatically adjusts the video output and the audio output by reading the changed EDID.
- the HPD signal when the HDMI input device updates the EDID, the HPD signal needs to be Low. Further, when the HDMI output device reads EDID, the HPD signal needs to be High. Therefore, in the method described in Non-Patent Document 1, when the delay amount is changed, the HPD signal is switched from Low to High (or pulse).
- HDMI standard adopts HDCP (High-bandwidth Digital Content Protection System), which is an authentication protocol for confirming that the connected device is a valid device when outputting content that requires copyright protection. It is specified that the authentication is started in response to the switching (or pulse) of the HPD signal from Low to High.
- HDCP High-bandwidth Digital Content Protection System
- FIG. 1 is a diagram showing an example of the configuration of a conventional HDMI-connected video / audio output system. As shown in FIG. 1, the DVD recorder 100, the AV amplifier 200, and the TV 300 are HDMI-connected.
- the DVD recorder 100 has one HDMI output port 100PO.
- the AV amplifier 200 includes one HDMI input port 200PI and one HDMI output port 200PO.
- the TV 300 includes one HDMI input port 300PI.
- DVD recorder 100, AV amplifier 200, and TV 300 are each connected by an HDMI cable.
- the video data and the audio data are transmitted in one direction through the HDMI output port 100PO, the HDMI input port 200PI, the HDMI output port 200PO, and the HDMI input port 300PI in order.
- the control message is transmitted bi-directionally on the HDMI control signal bus.
- the state of the present system is a state in which video is output from the TV 300 and audio is output from the AV amplifier 200 (hereinafter referred to as “theater mode”).
- the state in which audio is output from the TV is referred to as “TV mode”.
- FIG. 2 is a diagram for explaining the operation of each device in a conventional HDMI-connected video / audio output system.
- the horizontal axis in the figure represents the time axis (the same applies to FIGS. 3, 11, 12, and 17 described later).
- the EDID shown in (f) is necessary for the video to be output to the display device together with information indicating that 1080p is supported as an initial value.
- the time that is, the video output processing delay amount is described.
- the video output processing delay amount for example, a time “100 ms” required for 1080p video output processing is set. Detailed descriptions of other EDID descriptions will be omitted. Since the TV 300 and the AV amplifier 200 are effectively HDMI-connected, as shown in (e), the HPD signal output from the TV 300 to the AV amplifier 200 is set to High.
- the AV amplifier 200 since the AV amplifier 200 outputs audio, the AV amplifier 200 performs audio output based on the video output processing delay amount obtained from the EDID read from the TV 300 as shown in (f). Adjust (delay) the output of. Therefore, the video output processing delay amount is not set in the EDID of the AV amplifier 200 shown in (c) (or “0 ms” is set). Since the AV amplifier 200 and the DVD recorder 100 are effectively HDMI-connected, as shown in (b), the HPD signal output from the AV amplifier 200 to the DVD recorder 100 is set to High.
- DVD recorder 100 reads EDID of AV amplifier 200 shown in (c), and transmits video data and audio data.
- FIG. 3 is a diagram for explaining the operation when the output format of the video data output from the DVD recorder 100 is switched in the conventional HDMI-connected video / audio output system.
- the video output processing delay amount in standard quality 480p is smaller than the video output processing delay amount in high quality 1080p. Therefore, when the format of the video data output from the DVD recorder 100 is switched from 1080p to 480p at time T11, the audio output timing is adjusted based on the video output processing delay amount when the AV amplifier 200 is 1080p. As a result, a synchronization error occurs between the audio output from the AV amplifier 200 and the video output from the TV 300 (the audio output is delayed with respect to the video output).
- the TV 300 determines that (e) As shown, the HPD signal is temporarily switched to Low (time T12). Then, while the HPD signal shown in (e) is Low, the TV 300 updates the video output processing delay amount of EDID shown in (f) to, for example, 30 ms. Thereafter, the TV 300 switches the HPD signal shown in (e) to High again (time T13).
- the AV amplifier 200 When the AV amplifier 200 detects that the HPD signal of the TV 300 shown in (e) is switched from Low to High (time T13), the AV amplifier 200 reads the EDID of the TV 300 shown in (f). Then, the AV amplifier 200 switches the HPD signal of (b) from Low to High (time T14).
- the DVD recorder 100 determines that there is a possibility that the HDMI connection status has changed. Then, in order to comply with HDCP, the DVD recorder 100 checks whether or not the connection partner device is a valid device, that is, starts authentication. At the start of authentication, the DVD recorder 100 stops outputting video data and audio data that require content protection. Then, the DVD recorder 100 reads the EDID of the AV amplifier 200 shown in (c) again and transmits the video data (for example, blackout) that does not require content protection, while the AV amplifier 200 is a valid device. Check whether or not. Then, when the DVD recorder 100 can confirm that the AV amplifier 200 is a valid device, it starts outputting video data and audio data again (time T15). Since HDCP authentication is not the main point of the present invention, a detailed description thereof will be omitted.
- the EDID of the video output device is always rewritten when the video output processing delay amount changes in the video output device. Then, the video / audio reproduction device stops outputting video data and audio data (contents) that need to be protected, and performs HDCP authentication. As a result, in the video / audio data synchronization method described in Non-Patent Document 1, the video / audio data is not received for a few seconds until the video / audio reproduction device finishes authentication and starts outputting video data and audio data again. There is a problem that a period in which no data is output occurs.
- Patent Document 1 discloses a technique for providing video processing delay time information from a video output device (TV) to an audio output device (AV amplifier) using a control message.
- Non-Patent Document 1 when the video output processing delay amount changes in a device that outputs video, a period in which video data and audio data are not output occurs. It has the problem that it ends up.
- Patent Document 1 has a problem that the amount of control message transmission increases and the processing becomes complicated.
- the present invention has been made in view of the above problems, and provides a video / audio data synchronization method and the like that can suppress an increase in the amount of transmission of control messages and can avoid stopping video output.
- the purpose is to do.
- a video / audio data synchronization method provides an output from an audio output device in a video / audio output system including an audio output device and a video output device connected to each other through a predetermined interface.
- the playback capability information indicating the playback capability of the video output device and the connection status information indicating the validity of the connection status of the video output device can be transmitted in one direction from the video output device to the audio output device.
- the control message can be transmitted bi-directionally.
- connection status information is invalid.
- An authentication step for authenticating that the video output device is a valid device and when the authentication in the authentication step is successful, the connection status information is valid.
- the audio output device When the video output step indicates that the connection status information has changed from invalid to valid, the audio output device includes information indicating a first delay amount that is a time required for video output by the video output device A first delay acquisition step of acquiring reproduction capability information from the video output device through the interface; The audio output device adjusts the audio output timing based on the first delay amount acquired in the first delay amount acquisition step, and the video output device is in the video output step.
- the audio output device can acquire the reproduction capability information including the information indicating the first delay amount without transmitting the control message. It is possible to suppress an increase in the amount of message transmission and to synchronize the output of video and audio. Furthermore, when the connection status information indicates that it is valid, the audio output device can acquire the second delay amount, which is the delay amount measured in the video output device, by the control message, so that the reproduction capability information is acquired. It is not necessary to change the connection status. In other words, since it is not necessary to change the connection status information when the connection status information indicates that it is valid, it is possible to avoid stopping the video output without causing unnecessary authentication and Output synchronization can be achieved.
- the video output device is a rewritable memory when the connection state information indicates invalidity, and includes a memory storing the first delay amount.
- the memory It is preferable that the reproduction capability information including information indicating the first delay amount stored in is acquired, and the first delay amount stored in the memory is not updated in the delay amount transmitting step.
- connection state information indicates that the connection state information has changed from valid to invalid
- a delay amount document that is written in the memory as the first delay amount using the second delay amount obtained in the second delay amount obtaining step. It is preferable to include an inclusion step.
- the first delay amount stored in the memory is updated when the connection state information indicates that the connection state information has changed from valid to invalid, so that the delay amount when the connection state information is valid is continued. Makes it possible to quickly synchronize the output of video and audio when the connection state becomes valid again.
- the first delay amount is preferably a fixed time that is uniquely determined in advance by the video output device.
- the fixed time uniquely determined in advance by the video output device is the first delay amount
- the video is quickly displayed when the connection state becomes valid. And the output can be synchronized.
- the second delay amount acquired in the second delay amount acquisition step when the connection state information indicates a change from valid to invalid is transmitted as the first delay amount. It is preferable to do.
- the delay amount measured when the connection state information indicates that the connection state has changed from valid to invalid is acquired as the first delay amount when the connection state becomes valid again, so the connection state becomes valid. It is possible to quickly synchronize the output of video and audio.
- the delay amount transmission step the first delay amount acquired in the first delay amount acquisition step or the second delay amount previously transmitted in the delay amount transmission step and the second delay amount acquisition step are acquired. If the difference value from the second delay amount exceeds a predetermined threshold, it is preferable to transmit the second delay amount acquired in the second delay amount acquisition step.
- the second delay amount measured in the video output device is transmitted. Therefore, when the delay amount measured in the video output device deviates from the delay amount used in the audio output device, it is possible to quickly synchronize the output of the video and audio.
- the method further includes a delay amount requesting step of transmitting a control message including information requesting transmission of the second delay amount from the audio output device to the video output device, wherein in the delay amount transmitting step, the delay amount When the control message is transmitted in the request step, it is preferable to transmit the second delay amount.
- the video / audio data synchronization method is a video / audio output system comprising an audio output device and a video output device connected to each other by a predetermined interface, a first audio cable, and a second audio cable.
- the video signal can be transmitted in one direction to the video output device, and the control message can be transmitted in both directions.
- the first audio cable can transmit the second audio data from the video output device to the audio output device.
- the second audio cable is capable of transmitting third audio data from the video output device to the audio output device.
- the audio output device outputs a first delay amount, which is a time required for the video output device to output video, and second audio data transmitted by the first audio cable.
- the audio output device outputs the second delay amount that is the time required for video output and the third audio data transmitted by the second audio cable, the third delay that is the time required for video output.
- a delay amount transmitting step for transmitting the amount from the video output device to the audio output device, first audio data transmitted through the interface, second audio data transmitted through the first audio cable, and the second An audio switching step for instructing which of the third audio data transmitted through the audio cable is to be used to output audio; and the audio switching step
- the audio output device adjusts the timing of outputting audio based on the first delay amount transmitted in the delay amount transmission step;
- the sound output device outputs sound based on the second delay amount transmitted in the delay amount transmitting step.
- the voice output device is based on the third delay amount transmitted in the delay amount sending step.
- an audio output step for adjusting the timing of outputting the audio.
- the delay amount corresponding to each transmission path is transmitted to the audio output device, so that even if the audio output in the audio output device is switched, the output of the video and audio can be quickly synchronized. Is possible.
- an increase in the transmission amount of the control message can be suppressed.
- the video output device is a video output device connected to an audio output device by a predetermined interface, and the interface transmits video data from the audio output device to the video output device in one direction.
- Transmission capability information indicating the playback capability of the video output device and connection status information indicating the validity of the connection status of the video output device are transmitted in one direction from the video output device to the audio output device.
- the video output device receives the video data from the audio output device through the interface, and the video data receiving unit receives the video data from the audio output device through the interface.
- a video output unit that outputs video based on the video data, and indicates that the connection status information has changed from invalid to valid
- a first delay amount transmission unit that transmits the reproduction capability information including information indicating a first delay amount that is a time required for video output by the video output unit to the audio output device through the interface; and A second delay for transmitting a control message including information indicating a second delay amount, which is a time required for the video output by the video output unit, to the audio output device through the interface when the status information indicates that the status information is valid;
- a quantity transmission unit is
- the audio output device is an audio output device connected to the video output device by a predetermined interface, and the interface transmits video data in one direction from the audio output device to the video output device.
- Transmission capability information indicating the playback capability of the video output device and connection status information indicating the validity of the connection status of the video output device are transmitted in one direction from the video output device to the audio output device.
- the control message can be transmitted bidirectionally, and the video output device is a valid device when the audio output device indicates that the connection status information has changed from invalid to valid And when the authentication by the authenticating unit succeeds, the video output device displays the video data while the connection status information is valid.
- a video data transmission unit that transmits through the interface; and information indicating a first delay amount that is a time required for video output by the video output device when the connection status information indicates that the connection status information has changed from invalid to valid.
- the first delay amount receiving unit that receives the reproduction capability information from the video output device through the interface, and the time required for the video output by the video output device when the connection status information is valid.
- a second delay amount receiving unit that receives a control message including information indicating a second delay amount from the video output device through the interface, a first delay amount received by the first delay amount receiving unit, and the second delay amount Audio output for adjusting the audio output timing using either one of the second delay amounts acquired by the delay amount receiving unit Provided with a door.
- the video / audio output system is a video / audio output system including an audio output device and a video output device, which are connected to each other by a predetermined interface, wherein the interface transmits video data to the audio output device.
- the video output device is capable of transmitting in one direction from the video output device to the video output device, and includes reproduction capability information indicating the reproduction capability of the video output device and connection state information indicating the validity of the connection state of the video output device.
- a video data receiving unit that is capable of transmitting in one direction to the audio output device and bi-directionally transmitting a control message, and wherein the video output device receives video data from the audio output device through the interface
- a video output unit that outputs video based on the video data received by the video data receiving unit; and
- the playback capability information including information indicating a first delay amount, which is a time required for the video output by the video output unit, is transmitted to the audio output device when the connection state information indicates that the status has changed from invalid to valid.
- a control message including information indicating a second delay amount that is a time required for video output when the connection state information indicates that the connection state information is valid, and the audio output device.
- a second delay amount transmission unit for transmitting through the interface and when the audio output device indicates that the connection status information has changed from invalid to valid, the video output device is a valid device. And when the authentication by the authenticating unit succeeds, the video data is sent to the video output device while the connection status information is valid.
- a first delay amount receiving unit that receives the control message, and a control message that includes information indicating the second delay amount when the connection status information indicates that the connection state information is valid.
- a voice is output using either one of the two delay amount receivers and the first delay amount received by the first delay amount receiver and the second delay amount received by the second delay amount receiver.
- an audio output unit for adjusting timing is output using either one of the two delay amount receivers and the first delay amount received by the first delay amount receiver and the second delay amount received by the second delay amount receiver.
- the video / audio data synchronization method according to the present invention can suppress an increase in the transmission amount of the control message and avoid stopping the video output.
- FIG. 1 is a diagram illustrating an example of a configuration of a conventional HDMI-connected video / audio output system.
- FIG. 2 is a diagram for explaining the operation of each device in a conventional HDMI-connected video / audio output system.
- FIG. 3 is a diagram for explaining the operation when the output format of video data is switched in a conventional HDMI-connected video / audio output system.
- FIG. 4 is a diagram showing a configuration of an HDMI-connected video / audio output system according to Embodiment 1 of the present invention.
- FIG. 5 is a block diagram showing a functional configuration of the DVD recorder according to Embodiment 1 of the present invention.
- FIG. 6 is a block diagram showing a functional configuration of the AV amplifier according to Embodiment 1 of the present invention.
- FIG. 1 is a diagram illustrating an example of a configuration of a conventional HDMI-connected video / audio output system.
- FIG. 2 is a diagram for explaining the operation of each device in a conventional HDMI-connected video / audio output
- FIG. 7 is a block diagram showing a functional configuration of the TV according to Embodiment 1 of the present invention.
- FIG. 8 is a diagram showing a flow of processing by each device constituting the video / audio output system according to Embodiment 1 of the present invention.
- FIG. 9 is a diagram showing a flow of processing by each device constituting the video / audio output system according to Embodiment 1 of the present invention.
- FIG. 10 is a diagram showing a flow of processing by each device constituting the video / audio output system according to Embodiment 1 of the present invention.
- FIG. 11 is a diagram for explaining the operation of each device constituting the video / audio output system according to Embodiment 1 of the present invention.
- FIG. 12 is a diagram for explaining the operation of each device constituting the video / audio output system according to the modification of the first embodiment of the present invention.
- FIG. 13 is a diagram showing a configuration of an HDMI-connected video / audio output system according to Embodiment 2 of the present invention.
- FIG. 14 is a block diagram showing a functional configuration of the AV amplifier according to the second embodiment of the present invention.
- FIG. 15 is a block diagram showing a functional configuration of the TV according to the second embodiment of the present invention.
- FIG. 16 is a diagram showing the flow of processing by each device constituting the video / audio output system according to Embodiment 2 of the present invention.
- FIG. 17 is a diagram for explaining the operation of each device constituting the video / audio output system according to the present embodiment.
- the video output processing delay of the video output device is caused by the change of the video output format or the like when the connection of the device for transmitting / receiving the video data and the audio data is valid.
- the video output device notifies the changed video output processing delay amount by a control message. That is, the video output device does not change the video output processing delay amount of EDID transmitted in one direction to the audio output device. In other words, the video output device does not need to generate a disclosure trigger that temporarily invalidates and validates the connection by the HPD signal.
- the audio output device uses the video output processing delay amount notified later by the control message in preference to the video output processing delay amount obtained from the EDID read from the video output device at the start of connection, Adjust the audio output timing.
- the audio output device since the video output device does not need to switch (pulse) the HPD signal transmitted to the audio output device from Low to High, the audio output device also transmits the HPD signal transmitted to the video / audio reproduction device. There is no need to switch (pulse) from Low to High. Therefore, the video / audio reproduction device does not need to perform authentication based on HDCP again. For this reason, the audio output device and the video output device can synchronize temporally the audio output and the video output without interrupting the output of the video and audio.
- FIG. 4 is a diagram showing a configuration of the HDMI-connected video / audio output system 1 according to Embodiment 1 of the present invention.
- the video / audio output system 1 includes a DVD recorder 10, an AV amplifier 20, and a TV 30. These devices (DVD recorder 10, AV amplifier 20 and TV 30) constituting the video / audio output system 1 are connected to each other by an HDMI cable (hereinafter also simply referred to as “HDMI”).
- HDMI cable hereinafter also simply referred to as “HDMI”.
- the DVD recorder 10 is an example of a video / audio playback device that plays back video data and audio data, and includes an HDMI output port 10PO.
- the AV amplifier 20 is an example of an audio output device that outputs audio, and includes an HDMI input port 20PI and an HDMI output port 20PO.
- the TV 30 is an example of a video output device that outputs video, and includes an HDMI input port 30PI.
- the HDMI output port 10PO and the HDMI input port 20PI are connected by an HDMI cable.
- the HDMI output port 20PO and the HDMI input port 30PI are connected by an HDMI cable.
- This HDMI can transmit the video data and audio data reproduced by the DVD recorder 10 in one direction in the order of the AV amplifier 20 and the TV 30. Also, the HDMI can transmit reproduction capability information indicating the reproduction capability of the TV 30 and connection state information indicating the validity of the connection state of the TV 30 in one direction from the TV 30 to the AV amplifier 20. Also, HDMI can transmit control messages (hereinafter referred to as “CEC messages”) bidirectionally between devices connected to each other.
- CEC messages control messages
- FIG. 5 is a block diagram showing a functional configuration of the DVD recorder 10 in the present embodiment.
- the DVD recorder 10 includes an HDMI output unit 101, an HPD switching detection unit 102, an EDID information acquisition unit 103, an authentication / encryption unit 104, a CEC device cooperation unit 105, and a decoding unit 106.
- a TMDS (Transition-Minimized Differential Signaling) encoding unit 107 and a TMDS output unit 108 are provided.
- the HDMI output unit 101 includes an HDMI output port 10PO, and transmits video data and audio data and transmits and receives control messages (bidirectional communication).
- the HDMI output unit 101 includes an HPD terminal 101a that receives an HPD signal 210a, a DDC terminal 101b that transmits and receives a DDC signal, a TMDS terminal 101c that transmits a TMDS signal, and a CEC terminal 101d that transmits and receives a CEC signal.
- the HPD switching detection unit 102 detects switching of the HPD signal 210a received via the HPD terminal 101a of the HDMI output unit 101.
- the HPD signal is an example of connection state information indicating the validity of the connection state of an HDMI-connected device.
- the connection is valid when the HPD signal is High, and the connection is invalid when the HPD signal is Low.
- the HPD switching detection unit 102 detects the switching of the HPD signal 210a from High to Low (change from valid to invalid) or the switching of the HPD signal 210a from Low to High (change from invalid to valid).
- the EDID information acquisition unit 103 acquires the EDID 209a of the AV amplifier 20 by transmitting and receiving the DDC signal via the DDC terminal 101b when the HPD switching detection unit 102 detects that the HPD signal 210a is switched from Low to High. To do.
- the EDID 209a of the AV amplifier 20 describes reproduction capability information such as the format of video data and audio data that the AV amplifier 20 can support.
- the EDID information acquisition unit 103 outputs the reproduction capability information to the decoding unit 106.
- the EDID 209a of the AV amplifier 20 also describes whether or not the AV amplifier 20 is an HDMI device.
- the EDID information acquisition unit 103 instructs the authentication / encryption unit 104 to apply HDCP for authentication of the AV amplifier 20. At the same time, it instructs to start authentication of the AV amplifier 20.
- the EDID information acquisition unit 103 instructs the authentication / encryption unit 104 to stop authentication when the HPD switching detection unit 102 detects that the HPD signal 210a is switched from High to Low.
- the video output processing delay amount is not described in the EDID 209a of the AV amplifier 20 according to the present embodiment.
- the EDID of the AV amplifier according to the present invention is a video that conforms to Version 1.3a of the HDMI standard.
- the output processing delay amount may be described, or “0 ms” may be described as the video output processing delay amount.
- the authentication / encryption unit 104 confirms whether or not the AV amplifier 20 is a legitimate device according to the authentication start instruction from the EDID information acquisition unit 103. That is, the authentication / encryption unit 104 confirms whether the AV amplifier 20 is a device that properly supports HDCP. Specifically, the authentication / encryption unit 104 performs authentication processing according to the HDCP authentication protocol by transmitting and receiving a DDC signal via the DDC terminal 101b. Note that a legitimate device indicates a device that properly conforms to a copyright protection standard such as HDCP. Since TMDS output is required at the time of authentication, the authentication / encryption unit 104 outputs, to the TMDS output unit 108, data obtained by TMDS encoding content data that does not require copyright protection.
- content data that does not require copyright protection refers to data such as a blackout video that is a video of only one black color.
- the authentication / encryption unit 104 instructs the TMDS encoding unit 107 to generate data for TMDS transmission. Then, the authentication / encryption unit 104 generates encrypted TMDS transmission data by encrypting the TMDS transmission data generated by the TMDS encoding unit 107 using the successful authentication information. The authentication / encryption unit 104 then outputs the encrypted TMDS transmission data to the TMDS output unit 108.
- the authentication / encryption unit 104 instructs the TMDS encoding unit 107 to stop TMDS encoding of video data and audio data and to stop outputting TMDS transmission data to the authentication / encryption unit 104.
- the CEC device cooperation unit 105 transmits / receives a CEC message to / from an HDMI-connected device by transmitting / receiving a CEC signal via the CEC terminal 101d.
- the decoding unit 106 generates video data and audio data by decoding the video stream and the audio stream based on the reproduction capability information acquired from the EDID information acquisition unit 103. Then, the decoding unit 106 outputs the generated video data and audio data to the TMDS encoding unit 107.
- the TMDS encoding unit 107 generates TMDS transmission data by TMDS encoding the video data and audio data acquired from the decoding unit 106 in accordance with an instruction from the authentication / encryption unit 104. Then, the TMDS encoding unit 107 outputs the generated TMDS transmission data to the authentication / encryption unit 104.
- the TMDS output unit 108 transmits the TMDS signal via the TMDS terminal 101c, thereby transmitting the encrypted TMDS transmission data acquired from the authentication / encryption unit 104 or the unencrypted TMDS transmission data to the AV amplifier. 20 output.
- FIG. 6 is a block diagram showing a functional configuration of the AV amplifier 20 in the present embodiment.
- the AV amplifier 20 includes an HDMI output unit 201, an HPD switching detection unit 202, an EDID information acquisition unit 203, an authentication / encryption unit 204, a CEC device cooperation unit 205, and a TMDS output unit 206.
- the HDMI output unit 201 includes an HDMI output port 20PO, and transmits video data and audio data and transmits and receives control messages (bidirectional communication).
- the HDMI output unit 201 includes an HPD terminal 201a that receives an HPD signal 304a, a DDC terminal 201b that transmits and receives a DDC signal, a TMDS terminal 201c that transmits a TMDS signal, and a CEC terminal 201d that transmits and receives a CEC signal.
- the HPD switching detection unit 202 detects that the connection state information has changed from invalid to valid or from valid to invalid. Specifically, the HPD switching detection unit 202 detects switching of the HPD signal 304 a received via the HPD terminal 201 a of the HDMI output unit 201. That is, the HPD switching detection unit 202 detects the switching of the HPD signal 304a from High to Low (change from valid to invalid) or the switching of the HPD signal 304a from Low to High (change from invalid to valid).
- the EDID information acquisition unit 203 is an example of a first delay amount acquisition unit.
- the HPD switch detection unit 202 detects that the HPD signal 304a is switched from Low to High
- the EDID information acquisition unit 203 transmits and receives a DDC signal via the DDC terminal 201b.
- the EDID 303a of the TV 30 is acquired.
- the EDID 303a of the TV 30 describes reproduction capability information including information such as the video data and audio data formats that can be supported by the TV 30, the video output processing delay amount of the TV 30, and the like.
- the video output processing delay amount is a time required for video output by the TV 30.
- the video output processing delay amount is a time from when video data is received until video based on the received video data is output to the display.
- the EDID information acquisition unit 203 outputs the reproduction capability information to the EDID setting unit 208 and the audio output unit 214.
- the EDID 303a of the TV 30 also describes that the TV 30 is an HDMI device. Therefore, when the TV 30 is described as an HDMI device in the EDID 303a, the EDID information acquisition unit 203 instructs the authentication / encryption unit 204 to apply HDCP for authentication to the TV 30.
- the EDID information acquisition unit 203 only instructs to apply HDCP, and does not instruct the start of authentication.
- the EDID information acquisition unit 203 instructs the authentication / encryption unit 204 to stop authentication when the HPD switch detection unit 202 detects that the HPD signal 304a is switched from High to Low.
- the authentication / encryption unit 204 confirms whether the TV 30 is a legitimate device in accordance with the authentication start instruction from the authentication / decryption unit 212. Specifically, the authentication / encryption unit 204 performs authentication processing according to the HDCP authentication protocol by transmitting and receiving a DDC signal via the DDC terminal 201b. Since TMDS output is required at the time of authentication, the authentication / encryption unit 204 outputs, to the TMDS output unit 206, data obtained by TMDS encoding content data that does not require copyright protection.
- the authentication / encryption unit 204 instructs the authentication / decryption unit 212 to output data for TMDS transmission. Then, the authentication / encryption unit 204 generates encrypted TMDS transmission data by encrypting the TMDS transmission data decrypted by the authentication / decryption unit 212 using the successful authentication information. Then, the authentication / encryption unit 204 outputs the encrypted TMDS transmission data to the TMDS output unit 206.
- the authentication / encryption unit 204 instructs the authentication / decryption unit 212 to stop outputting the TMDS transmission data.
- the CEC device cooperation unit 205 transmits and receives CEC messages to and from the TV 30 and the DVD recorder 10 by transmitting and receiving CEC signals via the CEC terminal 201 d and the CEC terminal 207 d. Further, the CEC device cooperation unit 205 recognizes the setting of the television mode or the theater mode by transmitting and receiving a CEC message with the TV 30. Then, the CEC device cooperation unit 205 notifies the EDID setting unit 208 and the authentication / decryption unit 212 of information related to the recognized television mode or theater mode setting as setting information.
- the CEC device cooperation unit 205 includes a video output processing delay amount acquisition unit 205a.
- the video output processing delay amount acquisition unit 205a is an example of a second delay amount reception unit, and receives a CEC message instructing switching of the video output processing delay amount from the TV 30.
- the video output processing delay amount acquisition unit 205 a outputs the video output processing delay amount obtained from the received CEC message to the audio output unit 214.
- the TMDS output unit 206 is an example of a video data transmission unit, and transmits the TMDS signal to the TV 30 via the TMDS terminal 201c, whereby the encrypted TMDS transmission data acquired from the authentication / encryption unit 204 or encrypted The TMDS transmission data that has not been sent is output to the TV 30. Specifically, the TMDS output unit 206 transmits TMDS transmission data including video data to the TV 30 via the HDMI output unit 201 while indicating that the HPD signal 304a is valid.
- the HDMI input unit 207 includes an HDMI input port 20PI, and receives video data and audio data and transmits and receives control messages (bidirectional communication).
- the HDMI input unit 207 includes an HPD terminal 207a that transmits an HPD signal 210a, a DDC terminal 207b that transmits and receives a DDC signal, a TMDS terminal 207c that receives a TMDS signal, and a CEC terminal 207d that transmits and receives a CEC signal.
- the EDID setting unit 208 determines the description content of the EDID 209a based on the setting information (television mode or theater mode) notified from the CEC device cooperation unit 205.
- the EDID setting unit 208 changes the description content of the EDID 209a while the HPD signal 210a is Low. If the HPD signal 210a is High when changing the description of the EDID 209a, the EDID setting unit 208 instructs the HPD control unit 210 to change the HPD signal 210a to Low (HPD negate instruction). Then, after the change of the description of the EDID 209a is completed, the EDID setting unit 208 instructs the HPD control unit 210 to change the HPD signal 210a to High (HPD assert instruction).
- the EDID storage unit 209 includes, for example, a nonvolatile memory and stores the EDID 209a.
- the EDID 209a includes reproduction capability information.
- the HPD control unit 210 changes the HPD signal 210a to be transmitted through the HPD terminal 207a to High (valid) or Low (invalid) according to the HPD assert instruction or HPD negate instruction from the EDID setting unit 208.
- the TMDS input unit 211 receives the encrypted TMDS transmission data transmitted from the DVD recorder 10 via the TMDS terminal 207c. Then, the TMDS input unit 211 outputs the encrypted TMDS transmission data to the authentication / decryption unit 212.
- the authentication / decryption unit 212 responds to the authentication process according to the authentication protocol of the AV amplifier 20 by the DVD recorder 10.
- the authentication / decryption unit 212 instructs the authentication / encryption unit 204 to start authentication with the TV 30. Since an TMDS input is required at the time of an authentication response, the authentication / decryption unit 212 acquires TMDS transmission data that does not require copyright protection and is not encrypted from the TMDS input unit 211.
- the authentication / decryption unit 212 acquires encrypted TMDS transmission data from the TMDS input unit 211.
- the authentication / decryption unit 212 generates TMDS transmission data (unencrypted) by decrypting the acquired encrypted TMDS transmission data.
- the authentication / decryption unit 212 outputs the generated TMDS transmission data to the authentication / encryption unit 204 based on the setting information (television mode or theater mode) notified by the CEC device cooperation unit 205.
- the setting information is the theater mode
- the authentication / decryption unit 212 outputs the data obtained by removing the audio data from the decrypted TMDS transmission data to the authentication / encryption unit 204, and the decrypted TMDS.
- the transmission data is output to the TMDS decoding unit 213.
- the authentication / decryption unit 212 outputs the decrypted TMDS transmission data to the authentication / encryption unit 204 as it is without removing the audio data.
- the TMDS decoding unit 213 generates an audio stream by TMDS decoding the TMDS transmission data. Then, the TMDS decoding unit 213 outputs the generated audio stream to the audio output unit 214.
- the audio output unit 214 includes a speaker and outputs audio using the audio stream generated by the TMDS decoding unit 213.
- the audio output unit 214 adjusts (delays) the audio output timing based on the video output processing delay amount acquired by the EDID information acquisition unit 203 or the video output processing delay amount acquisition unit 205a. Note that when a plurality of video output processing delay amounts are acquired by the EDID information acquisition unit 203 and the video output processing delay amount acquisition unit 205a, the audio output unit 214 performs audio processing based on the latest video output processing delay amount. Adjust the output timing.
- FIG. 7 is a block diagram showing a functional configuration of the TV 30 in the present embodiment.
- the TV 30 includes an HDMI input unit 301, an EDID setting unit 302, an EDID storage unit 303, an HPD control unit 304, a TMDS input unit 305, an authentication / decryption unit 306, a CEC device cooperation unit 307, and a TMDS decoding unit. 308, a video output unit 309, and an audio output unit 310.
- the HDMI input unit 301 includes an HDMI input port 30PI, and receives video data and audio data and transmits and receives control messages (bidirectional communication).
- the HDMI input unit 301 includes an HPD terminal 301a that transmits an HPD signal 304a, a DDC terminal 301b that transmits and receives a DDC signal, a TMDS terminal 301c that receives a TMDS signal, and a CEC terminal 301d that transmits and receives a CEC signal.
- the EDID setting unit 302 determines the description content of the EDID 303 a when the power is turned on, and sets the determined description content in the EDID 303 a stored in the EDID storage unit 303.
- the EDID setting unit 302 sets a fixed time, which is uniquely determined in advance by the TV 30, in the EDID 303a as a video output processing delay amount.
- the EDID setting unit 302 always sets the delay amount 100 ms generated when outputting the video of “1080p” which is the maximum resolution video format among the video formats supported by the TV 30 as the video output processing delay amount. To do.
- the HDMI output device selects the data output format by acquiring the playback capability information of the connected HDMI input device, the highest quality video format supported by both the HDMI output device and the HDMI input device. And the assumption that the audio format is likely to be selected as the output format. That is, the video / audio output system 1 can increase the possibility that the video output and the audio output can be synchronized by setting the delay amount in the video format of the maximum resolution as the video output processing delay amount. Then, after setting the description content of the EDID 303a, the EDID setting unit 302 instructs the HPD control unit 304 to change the HPD signal 304a to High (HPD assert instruction).
- the EDID storage unit 303 includes, for example, a nonvolatile memory and stores the EDID 303a.
- reproduction capability information including information indicating the video output processing delay amount is set.
- the HPD control unit 304 changes the HPD signal 304a to be transmitted to the AV amplifier 20 via the HPD terminal 301a to High (valid) in accordance with an HPD assert instruction from the EDID setting unit 302.
- the TMDS input unit 305 receives the encrypted TMDS transmission data transmitted by the AV amplifier 20 via the TMDS terminal 301 c of the HDMI input unit 301. Then, the TMDS input unit 305 outputs the encrypted TMDS transmission data to the authentication / decryption unit 306.
- the authentication / decryption unit 306 responds to the authentication of the TV 30 by the AV amplifier 20. Since the TMDS input is required at the time of the authentication response, the authentication / decryption unit 306 acquires from the TMDS input unit 305 TMDS transmission data that does not require copyright protection and is not encrypted. If the authentication of the TV 30 is successful, the authentication / decryption unit 306 obtains encrypted TMDS transmission data from the TMDS input unit 305. The authentication / decryption unit 306 generates TMDS transmission data (not encrypted) by decrypting the acquired encrypted TMDS transmission data. Then, authentication / decryption unit 306 outputs the generated TMDS transmission data to TMDS decoding unit 308.
- the CEC device cooperation unit 307 transmits / receives a CEC message to / from the AV amplifier 20 by transmitting / receiving a CEC signal to / from the AV amplifier 20 via the CEC terminal 301d.
- the CEC device cooperation unit 307 switches the setting of the television mode or the theater mode by transmitting / receiving a CEC message to / from the AV amplifier 20 or transmitting / receiving a CEC message to / from the DVD recorder 10 via the AV amplifier 20.
- the CEC device cooperation unit 307 includes a video output processing delay amount setting unit 307a.
- the video output processing delay amount setting unit 307 a acquires the video output processing delay amount from the video output unit 309. Then, the video output processing delay amount setting unit 307a uses the video output processing delay amount acquired from the video output unit 309 and the video output processing delay amount set in the EDID 303a or the video output processing delay amount setting unit 307a before AV.
- the difference value from the video output processing delay amount transmitted to the amplifier 20 exceeds a threshold (for example, 0 to 50 ms) indicating a value that can be accepted by a person as a lip sync deviation
- a threshold for example, 0 to 50 ms
- a CEC message instructing switching to the processing delay amount is transmitted to the AV amplifier 20.
- the TMDS decoding unit 308 generates a video stream and an audio stream by TMDS decoding the TMDS transmission data. Then, the TMDS decoding unit 308 outputs the generated video stream to the video output unit 309, and outputs the generated audio stream to the audio output unit 310.
- the video output unit 309 outputs video to an output medium such as a display.
- the video output unit 309 measures the time required from when the TV 30 receives the encrypted TMDS transmission data until it is displayed on the output medium. Then, the video output unit 309 notifies the video output processing delay amount setting unit 307a of the measured time as a video output processing delay amount.
- the audio output unit 310 includes a speaker or the like, and outputs audio using the audio stream generated by the TMDS decoding unit 213 in the television mode.
- 8 to 10 are diagrams showing the flow of processing by each device constituting the video / audio output system 1 in the present embodiment.
- 8 to 10 are diagrams showing the flow of processing when the theater mode is selected in the video / audio output system 1.
- FIG. 8 to 10 are diagrams showing the flow of processing when the theater mode is selected in the video / audio output system 1.
- the EDID setting unit 302 of the TV 30 sets the video output processing delay amount in the EDID 303a (step S101). Then, the HPD control unit 304 of the TV 30 changes the HPD signal 304a from Low to High (Step S102).
- the HPD switching detection unit 202 of the AV amplifier 20 detects switching of the HPD signal 304a from Low to High (Step S103).
- the EDID information acquisition unit 203 of the AV amplifier 20 acquires the EDID 303a stored in the EDID storage unit 303 of the TV 30 (step S104). That is, when the HPD signal 304a changes from Low to High, the AV amplifier 20 acquires the EDID 303a from the TV 30 through HDMI.
- the EDID 303a describes reproduction capability information including information indicating a video output processing delay amount (first delay amount) that is a time required for video output by the TV 30.
- the HPD control unit 210 of the AV amplifier 20 changes the HPD signal 210a from Low to High (Step S105).
- the HPD switching detection unit 102 of the DVD recorder 10 detects switching from Low to High of the HPD signal 210a (Step S106).
- the EDID information acquisition unit 103 of the DVD recorder 10 acquires the EDID 209a stored in the EDID storage unit 209 of the AV amplifier 20 (step S107).
- the authentication / encryption unit 104 of the DVD recorder 10 starts authentication that the AV amplifier 20 is a valid device (step S108).
- the authentication / decryption unit 212 of the AV amplifier 20 transmits authentication information to the DVD recorder 10 in accordance with an authentication instruction from the DVD recorder 10 (step S109).
- the authentication / encryption unit 104 of the DVD recorder 10 authenticates the AV amplifier 20 using the received authentication information (step S110).
- the authentication / encryption unit 204 of the AV amplifier 20 starts authentication of the TV 30 (step S111).
- the authentication / decryption unit 306 of the TV 30 transmits the authentication information to the AV amplifier 20 in accordance with the authentication instruction from the AV amplifier 20 (step S112).
- the authentication / encryption unit 204 of the AV amplifier 20 authenticates the TV 30 using the received authentication information (step S113).
- the TMDS output unit 108 of the DVD recorder 10 transmits the encrypted TMDS transmission data to the AV amplifier 20 (step S114). Specifically, the TMDS encoding unit 107 of the DVD recorder 10 generates TMDS transmission data by TMDS encoding video data and audio data. Then, the authentication / encryption unit 104 of the DVD recorder 10 generates encrypted TMDS transmission data by encrypting the generated TMDS transmission data using the authentication information of the AV amplifier 20. The TMDS output unit 108 of the DVD recorder 10 transmits the encrypted TMDS transmission data generated in this way to the AV amplifier 20 via the HDMI output unit 101. Also, the DVD recorder 10 performs authentication for confirming that the TV 30 is a valid device for the AV amplifier 20 (step S115).
- the authentication / decryption unit 212 of the AV amplifier 20 decrypts the received encrypted TMDS transmission data (step S116).
- the TMDS output unit 206 of the AV amplifier 20 transmits the encrypted TMDS transmission data to the TV 30 (step S117).
- the authentication / encryption unit 204 of the AV amplifier 20 generates encrypted TMDS transmission data by encrypting the decrypted TMDS transmission data using the authentication information of the TV 30.
- the TMDS output unit 206 of the AV amplifier 20 transmits the encrypted TMDS transmission data generated in this way to the TV 30 via the HDMI output unit 201.
- the AV amplifier 20 responds to authentication from the DVD recorder 10 for confirming that the TV 30 is a valid device (step S118).
- the authentication start from the AV amplifier 20 to the TV 30 (step S111) is performed after the authentication start from the DVD recorder 10 to the AV amplifier 20 (step S108), and the respective authentications are performed in parallel.
- the authentication / decryption unit 306 of the TV 30 decrypts the received encrypted TMDS transmission data (step S119). Then, the TMDS decoding unit 308 of the TV 30 generates a video stream and an audio stream by performing TMDS decoding on the decoded TMDS transmission data (step S120). The video output unit 309 outputs a video using the generated video stream (step S121).
- the TMDS decoding unit 213 of the AV amplifier 20 generates an audio stream by performing TMDS decoding on the decoded TMDS transmission data (step S122). Then, the audio output unit 214 of the AV amplifier 20 synchronizes with the video output in step S121 by adjusting the audio output timing based on the video output processing delay amount obtained from the EDID 303a acquired in step S104. The voice is output so as to do (step S123).
- the decoding unit 106 of the DVD recorder 10 changes the video format of the video data (step S124). For example, the decoding unit 106 changes the video format from 1080p to 480p. Similarly to steps S114 to S121, the video data whose video format has been changed is also transmitted to the TV 30, and a video is output based on the transmitted video data. As a result, the video output processing delay amount setting unit 307a of the TV 30 detects that the video output processing delay amount has changed (step S125). For example, the video output unit 309 measures the time required for video output, and notifies the video output processing delay amount setting unit 307a of the measured time as a video output processing delay amount (second delay amount).
- the video output processing delay amount setting unit 307a when the difference value between the measured video output processing delay amount notified from the video output unit 309 and the video output processing delay amount obtained from the EDID 303a exceeds a predetermined threshold value In addition, it is detected that the video output processing delay amount has changed.
- a predetermined threshold value a value (for example, 0 to 50 ms) that can be accepted by a person as the lip sync deviation may be used.
- the video output unit 309 notifies the video output processing delay amount setting unit 307a of the measured video output processing delay amount, but the video output processing delay amount may not necessarily be measured.
- the video output unit 309 may acquire the video output processing delay amount corresponding to the video format of the video being output by referring to a table previously stored in a memory included in the video output device. Then, the video output unit 309 may notify the acquired video output processing delay amount to the video output processing delay amount setting unit 307a.
- the video output processing delay amount setting unit 307a transmits a CEC message instructing switching to the video output processing delay amount acquired from the video output unit 309 to the AV amplifier 20 (step S126).
- This instruction is transmitted to the AV amplifier 20 using, for example, a CEC message command (Vendor Command).
- the EDID setting unit 302 of the TV 30 does not update the video output processing delay amount of the EDID 303 a stored in the EDID storage unit 303.
- the audio output unit 214 of the AV amplifier 20 adjusts the timing of outputting audio based on the video output processing delay amount obtained from the CEC message, thereby outputting the video output based on the changed video format. Audio is output so as to be synchronized (step S127).
- FIG. 11 is a diagram for explaining the operation of each device constituting the video / audio output system 1 according to the present embodiment.
- the video output processing delay amount changes, for example, from 100 ms to 30 ms.
- the TV 30 transmits a CEC message instructing the AV amplifier 20 to switch the video output processing delay amount at time T2.
- This instruction includes, for example, information indicating a video output processing delay amount transmitted using a command (Vendor Command) of a CEC message and measured by the TV 30.
- the TV 30 does not change the video output processing delay amount of the EDID 303a as 100 ms. That is, the TV 30 does not need to pulse the HPD signal 304a. Therefore, the DVD recorder 10 does not need to start HDCP authentication for confirming whether or not the AV amplifier 20 is a legitimate device, and therefore can continue outputting content (video data and audio data) as it is. it can.
- the AV amplifier 20 preferentially uses the video output processing delay amount obtained from the received CEC message. Therefore, the AV amplifier 20 can adjust the audio output timing irrespective of the video output processing delay amount described in the EDID 303a of the TV 30.
- the video / audio data synchronization method it is possible to eliminate the need for command notification by useless control messages by acquiring the video output processing delay amount optimal for the system from the EDID at the start of the HDMI connection. it can.
- the video output processing delay amount when the video output processing delay amount changes, the video output processing delay amount is calculated using a command based on a control message that does not require the HDMI connection to be invalidated.
- the AV amplifier 20 sets the audio output timing to the optimum synchronization timing according to the video output without stopping the transmission of the content (video data and audio data) reproduced by the DVD recorder 10. Can be adjusted.
- the video / audio data synchronization method reproduces information including the video output processing delay amount without transmitting a control message when the connection state information indicates that the connection status information has changed from invalid to valid. Since the audio output device can acquire the capability information, it is possible to suppress an increase in the transmission amount of the control message and to synchronize the output of the video and the audio. Furthermore, when the connection status information indicates that it is valid, the video output processing delay amount measured in the video output device can be acquired by the audio output device receiving the control message, so the playback capability information is acquired. No need to change the connection state. In other words, since it is not necessary to change the connection status information when the connection status information indicates that it is valid, it is possible to avoid stopping the video output without causing unnecessary authentication and Output synchronization can be achieved.
- the EDID setting unit 302 causes the video output processing delay in the highest quality video format supported by both the HDMI output device and the HDMI input device when the power is turned on.
- the amount is set to EDID 303a, the video / audio data synchronization method according to the present invention is not necessarily limited to the video output processing delay amount in the highest quality video format.
- the EDID setting unit 302 may set a fixed value determined as the product specification of the HDMI input device as the video output processing delay amount. Also, the EDID setting unit 302 uses the video output processing delay amount measured by the video output unit 309 as the video output processing delay amount of the EDID 303a stored in the EDID storage unit 303 when the HPD signal changes from High to Low. May be updated. Specifically, the latest video output processing delay amount transmitted by the video output processing delay amount setting unit 307a is stored when the power is turned off, and the stored video output processing delay amount is set by EDID when the power is turned on again. The unit 302 may read the data.
- the audio output device can adjust the audio output timing to the optimum synchronization timing in accordance with the video output.
- FIG. 12 is a diagram for explaining the operation of each device constituting the video / audio output system 1 in a modification of the present embodiment.
- FIG. 12 is a diagram in which operations after time T6 are added to FIG.
- the HPD signal 304a of the TV 30 becomes Low.
- the EDID 303a of the TV 30 changes to the video output processing delay amount immediately before the power is turned off, that is, “30 ms”.
- the HPD signal of the TV 30 becomes High, and the EDID 304a of the TV 30 is transmitted to the AV amplifier 20.
- the audio output delay amount of the AV amplifier 20 continues to be “30 ms”. Then, the HPD signal 210a of the AV amplifier 20 becomes Low at time T8, then becomes High at time T9, and the re-authentication operation starts.
- the video output unit 309 of the TV 30 measures the time taken until the input video data is displayed on the output medium, and notifies the video output processing delay amount setting unit 307a of the measured time.
- the video output unit 309 it is not always necessary for the video output unit 309 to measure time.
- the TMDS decoding unit 308 sets the video output processing delay amount by referring to a database that holds in advance the video output processing delay amount corresponding to the output video format, environment setting conditions, and the like. You may notify to the part 307a.
- the TMDS decoding unit 308 recognizes the video format and acquires the video output processing delay amount corresponding to the recognized video format.
- the video output device may be a video / audio output device having an audio output function.
- the TV 30 when the video output processing delay amount changes, the TV 30 voluntarily transmits a CEC message specifying the video output processing delay amount to the AV amplifier 20.
- the TV 30 may respond to the inquiry CEC message with a CEC message that specifies the video output processing delay amount. That is, when the AV amplifier 20 transmits a control message including information requesting transmission of the video output processing delay amount to the TV 30, the TV 30 may transmit the video output processing delay amount to the AV amplifier 20.
- the video / audio output system can synchronize the output of video and audio using the video output processing delay amount easily measured at an arbitrary timing.
- FIG. 13 is a diagram showing a configuration of the HDMI-connected video / audio output system 2 according to Embodiment 2 of the present invention.
- the video / audio output system 2 includes a DVD recorder 10, an AV amplifier 25, and a TV 35.
- the video / audio output system 2 according to the present embodiment is different from the video / audio output system 1 according to the first embodiment shown in FIG. 4 in that the AV amplifier 25 and the TV 35 are connected to the first audio cable in addition to the HDMI cable. (Hereinafter referred to as “optical digital audio cable”) and a second audio cable (hereinafter referred to as “analog audio cable”).
- the DVD recorder 10 has the same function as the DVD recorder 10 according to the first embodiment shown in FIG.
- the AV amplifier 25 is an example of an audio output device that outputs audio, and includes an HDMI input port 25PI, an HDMI output port 25PO, an optical digital audio input port 25PId, and an analog audio input port 25PIa.
- the TV 35 is an example of a video output device that outputs video, and includes an HDMI input port 35PI, an optical digital audio output port 35POd, and an analog audio output port 35POa.
- HDMI is capable of transmitting video data and first audio data (hereinafter referred to as “HDMI audio data”) reproduced by the DVD recorder 10 in one direction in the order of the AV amplifier 25 and the TV 35. Also, the HDMI can transmit reproduction capability information indicating the reproduction capability of the TV 35 and connection state information indicating the validity of the connection state of the TV 35 from the TV 35 to the AV amplifier 25 in one direction. Also, HDMI can transmit control messages bidirectionally between devices connected to each other.
- the optical digital audio cable can transmit second audio data (hereinafter referred to as “optical digital audio data”) in one direction from the optical digital audio output port 35POd of the TV 35 to the optical digital audio input port 25PId of the AV amplifier 25. is there.
- the analog audio cable can transmit the third audio data (hereinafter referred to as “analog audio data”) in one direction from the analog audio output port 35POa of the TV 35 to the analog audio input port 25PIa of the AV amplifier 25.
- analog audio data hereinafter referred to as “analog audio data”
- the optical digital audio data is transmitted from the TV 35 to the AV amplifier 25 via an optical digital audio cable.
- Analog audio data is transmitted from the TV 35 to the AV amplifier 25 by an analog audio cable.
- the AV amplifier 25 adjusts the audio output timing based on the video output processing delay amount when video is output based on video data and audio data transmitted by HDMI. In this case, since the delay due to the difference in the transmission path of the audio data is not taken into account, a deviation occurs between the audio output from the AV amplifier 25 and the video output from the TV 35.
- the video output processing delay amount reflecting the audio output processing delay amount for each transmission path of the audio data is calculated, and all the calculated video output processing delay amounts are calculated. Is transmitted from the video output device to the audio output device. Then, the audio output device uses the video output processing delay amount corresponding to the audio switching setting to adjust the audio output timing. Therefore, the video output device does not need to recognize the audio input setting state of the audio output device. Furthermore, the audio output device adjusts the timing of outputting audio so that it synchronizes with the video output by the video output device without transmitting / receiving a new control message when the audio input of the own device is switched. Can do.
- the functional configuration of the DVD recorder 10 according to the present embodiment is the same as that shown in FIG.
- the AV amplifier 25 includes an HDMI output unit 251, an HPD switching detection unit 252, an EDID information acquisition unit 253, an authentication / encryption unit 254, a CEC device cooperation unit 255, and a TMDS output unit 256.
- the HDMI output unit 251 includes an HDMI output port 25PO, and transmits video data and audio data and transmits and receives control messages (bidirectional communication).
- the HDMI output unit 251 includes an HPD terminal 251a that receives an HPD signal 354a, a DDC terminal 251b that transmits and receives a DDC signal, a TMDS terminal 251c that transmits a TMDS signal, and a CEC terminal 251d that transmits and receives a CEC signal.
- the HPD switching detection unit 252 detects that the connection state information has changed from invalid to valid or from valid to invalid. Specifically, the HPD switching detection unit 202 detects switching of the HPD signal 354a received via the HPD terminal 251a of the HDMI output unit 251. That is, the HPD switching detection unit 202 detects the switching of the HPD signal 354a from High to Low (change from valid to invalid) or the switching of the HPD signal 354a from Low to High (change from invalid to valid).
- the EDID information acquisition unit 253 acquires the EDID 353a of the TV 35 by transmitting and receiving the DDC signal via the DDC terminal 251b when the HPD switching detection unit 252 detects the switching of the HPD signal 354a from Low to High.
- the EDID 353a of the TV 35 describes playback capability information including information such as the video data and audio data formats that can be supported by the TV 35 and the video output processing delay amount of the TV 35.
- the EDID information acquisition unit 253 outputs the reproduction capability information to the EDID setting unit 258 and the audio output unit 264.
- the EDID 353a of the TV 35 also describes that the TV 35 is an HDMI device.
- the authentication / encryption unit 254 confirms whether the TV 35 is a legitimate device in accordance with the authentication start instruction from the authentication / decryption unit 262. Specifically, the authentication / encryption unit 204 performs authentication processing according to the HDCP authentication protocol by transmitting and receiving a DDC signal via the DDC terminal 251b. Since TMDS output is required at the time of authentication, the authentication / encryption unit 254 outputs to the TMDS output unit 256 data that is TMDS-encoded content data that does not require copyright protection.
- the authentication / encryption unit 254 instructs the authentication / decryption unit 262 to output data for TMDS transmission. Then, the authentication / encryption unit 254 generates encrypted TMDS transmission data by encrypting the TMDS transmission data decrypted by the authentication / decryption unit 212 using the successful authentication information. Then, the authentication / encryption unit 204 outputs the encrypted TMDS transmission data to the TMDS output unit 256.
- the CEC device cooperation unit 255 transmits / receives a CEC message to / from the DVD recorder 10 and the TV 35 by transmitting / receiving a CEC signal via the CEC terminal 251d and the CEC terminal 257d.
- the CEC device cooperation unit 255 recognizes information regarding the setting of the television mode or the theater mode by transmitting and receiving a CEC message with the TV 35. Then, the CEC device cooperation unit 255 notifies the EDID setting unit 258 and the authentication / decryption unit 262 of the information related to the recognized television mode or theater mode setting as setting information.
- the CEC device cooperation unit 255 includes a video output processing delay amount acquisition unit 255a.
- the video output processing delay amount acquisition unit 255a receives a CEC message including information indicating the first, second, and third video output processing delay amounts from the TV 35.
- the video output processing delay amount acquisition unit 255a outputs the first, second, and third video output processing delay amounts obtained from the received CEC message to the audio output unit 264.
- the CEC device cooperation unit 255 receives a CEC message including information related to the voice switching instruction.
- the CEC device cooperation unit 255 outputs information obtained from the received CEC message to the voice input switching unit 267.
- the CEC device cooperation unit 255 acquires the CEC message from the HDMI input unit 257.
- the audio input switching unit 267 is instructed to switch the audio output unit 264 so as to output audio based on the audio data. Details of the input switching operation by the CEC message are not the main point of the present invention, and thus the description thereof is omitted.
- the TMDS output unit 256 transmits the TMDS signal to the TV 35 via the TMDS terminal 251c, thereby transmitting the encrypted TMDS transmission data acquired from the authentication / encryption unit 254 or the unencrypted TMDS transmission data, Output to TV35. That is, when the authentication / encryption unit 254 succeeds in authenticating the TV 35, the TMDS output unit 256 transmits TMDS transmission data including video data to the TV 35 via the HDMI output unit 251.
- the HPD control unit 260 changes the HPD signal 260a transmitted via the HPD terminal 257a to High (valid) or Low (invalid) in accordance with an HPD assert instruction or HPD negate instruction from the EDID setting unit 258.
- the TMDS input unit 261 receives the encrypted TMDS transmission data transmitted by the DVD recorder 10 via the TMDS terminal 257c. Then, the TMDS input unit 261 outputs the encrypted TMDS transmission data to the authentication / decryption unit 262.
- the authentication / decryption unit 262 responds to authentication processing in accordance with the authentication protocol of the AV amplifier 25 by the DVD recorder 10.
- the authentication / decryption unit 262 instructs the authentication / encryption unit 254 to start authentication with the TV 35. Since the TMDS input is required at the time of the authentication response, the authentication / decryption unit 262 acquires from the TMDS input unit 261 TMDS transmission data that does not require copyright protection and is not encrypted.
- the authentication / decryption unit 262 acquires encrypted TMDS transmission data from the TMDS input unit 261.
- the TMDS decoding unit 263 generates an audio stream by TMDS decoding the TMDS transmission data. Then, the TMDS decoding unit 263 outputs the generated audio stream to the audio output unit 264.
- the analog audio input unit 266 includes an analog audio input port 25PIa and receives analog audio data from the TV 35. Then, the analog audio input unit 266 outputs an audio stream obtained from the received analog audio data to the audio output unit 264.
- the audio output unit 264 when an audio switching instruction is issued that instructs the audio output unit 264 to output audio based on the optical digital audio data acquired by the optical digital audio input unit 265, the audio output unit 264 The audio output timing is adjusted using the second video output processing delay amount, which is the video output processing delay amount corresponding to the audio data acquired by the input unit 265.
- the TV 35 includes an HDMI input unit 351, an EDID setting unit 352, an EDID storage unit 353, an HPD control unit 354, a TMDS input unit 355, an authentication / decryption unit 356, and CEC device cooperation.
- the HDMI input unit 351 includes an HDMI input port 35PI, and receives video data and audio data and transmits and receives control messages (bidirectional communication).
- the HDMI input unit 351 includes an HPD terminal 351a that transmits an HPD signal 354a, a DDC terminal 351b that transmits and receives a DDC signal, a TMDS terminal 351c that receives a TMDS signal, and a CEC terminal 351d that transmits and receives a CEC signal.
- the EDID setting unit 352 determines the description content of the EDID 353a when the power is turned on, and sets the determined description content in the EDID 353a. After setting the description content of EDID 353a, EDID setting unit 352 instructs HPD control unit 354 to change HPD signal 354a to High (HPD assertion instruction). For example, when the EDID setting unit 352 acquires a video switching instruction that instructs to output video based on video data other than video data transmitted by HDMI, the EDID setting unit 352 transmits the video switching instruction to the AV amplifier 25 via the HPD terminal 351a. The HPD control unit 354 is instructed to change the HPD signal 354a to be output to Low.
- the EDID storage unit 353 includes, for example, a nonvolatile memory and stores the EDID 353a.
- reproduction capability information including information indicating the video output processing delay amount is set.
- the HPD control unit 354 changes the HPD signal 354a to be transmitted to the AV amplifier 25 via the HPD terminal 351a to High (valid) in accordance with the HPD assert instruction from the EDID setting unit 352. Further, the HPD control unit 354 changes the HPD signal 354a transmitted to the AV amplifier 25 via the HPD terminal 351a to Low (invalid) in accordance with the HPD negation instruction from the EDID setting unit 352.
- the TMDS input unit 355 receives the encrypted TMDS data transmitted by the AV amplifier 25 by receiving the TMDS signal from the TMDS terminal 351c. Then, the TMDS input unit 355 outputs the received encrypted TMDS transmission data to the authentication / decryption unit 356.
- the first video output processing delay amount is a video output processing delay amount (for example, 100 ms) acquired from the video output unit 359.
- the second video output processing delay amount is a video output processing delay amount when audio is output from the optical digital audio output unit 363.
- the video output processing delay amount acquired from the video output unit 359 for example, 100 ms
- the audio output processing delay amount for example, 60 ms
- the third video output processing delay amount is a video output processing delay amount when audio is output from the analog audio output unit 364.
- the TV 35 When the audio is output based on the first video output processing delay amount 100 ms for synchronizing the timing with the video output by the TV 35 when outputting the audio and the audio data transmitted by the optical digital audio cable, the TV 35 To synchronize the timing with the video output by the TV 35 when outputting the audio based on the second video output processing delay amount 40 ms for synchronizing the timing with the video to be output and the audio data transmitted by the analog audio cable.
- the third video output processing delay amount of 50 ms can be received.
- the video output unit 359 outputs video to an output medium such as a display.
- the video output unit 359 detects the time required from when the TV 35 receives the encrypted TMDS transmission data until it is displayed on the output medium. Then, the video output unit 359 notifies the video output processing delay amount setting unit 357a of the detected time as a video output processing delay amount.
- the audio output unit 360 includes a speaker or the like, and outputs audio using the audio stream generated by the TMDS decoding unit 213 in the television mode.
- the optical digital audio output unit 363 includes an optical digital audio output port 35POd, and transmits the audio stream generated by the tuner decoding unit 362 to the AV amplifier 25 as audio data. Also, the optical digital audio output unit 363 measures the time taken for the acquired audio stream to be received by the AV amplifier 25. If the measured time changes, the measured time is used as the video output processing delay amount. You may notify to the setting part 357a.
- FIG. 16 is a diagram showing the flow of processing by each device constituting the video / audio output system 2 in the present embodiment.
- the same processing as the processing by the video / audio output system 1 in the first embodiment shown in FIGS. 8 to 10 is executed, and therefore FIG. 16 shows the processing in FIGS. Only the processing that is different from the above processing is shown.
- the video output processing delay amount setting unit 357a of the TV 35 acquires various delay amounts (step S202). Specifically, the video output processing delay amount setting unit 357 a obtains from the video output unit 359 the video output processing delay amount that is the time required for video output based on the video data in the TV 35. Further, the video output processing delay amount setting unit 357 a sets an optical digital audio output processing delay amount, which is a time required for the TV 35 to generate optical digital audio data transmitted by the optical digital audio cable, from the optical digital audio output unit 363. get. Further, the video output processing delay amount setting unit 357a acquires from the analog audio output unit 364 an analog audio output processing delay amount that is a time required for the TV 35 to generate analog audio data transmitted by the analog audio cable.
- the video output processing delay amount setting unit 357a of the TV 35 obtains the first, second, and third obtained from the acquired video output processing delay amount, optical digital audio output processing delay amount, and analog audio output processing delay amount.
- a CEC message including information indicating the video output processing delay amount is transmitted to the AV amplifier 25 (step S203).
- the first video output processing delay amount is the video output processing delay amount acquired from the video output unit 359.
- the second video output processing delay amount is a value obtained by subtracting the optical digital audio output processing delay amount from the video output processing delay amount acquired from the video output unit 359.
- the third video output processing delay amount is a value obtained by subtracting the analog audio output processing delay amount from the video output processing delay amount acquired from the video output unit 359.
- the audio input switching unit 267 of the AV amplifier 25 notifies the audio output unit 264 of an audio switching instruction (step S204). Specifically, the audio input switching unit 267 outputs an audio based on an audio switching instruction that instructs to output audio based on audio data transmitted by HDMI, and audio data transmitted by an optical digital audio cable.
- the voice output unit 264 is notified of a voice switching instruction instructing to perform or a voice switching instruction instructing to output voice based on voice data transmitted through the analog voice cable.
- the AV amplifier 25 since the first, second, and third video output processing delay amounts are transmitted to the AV amplifier 25, after time T4, in the AV amplifier 25, from the optical digital to the analog, or from the analog to the optical digital. Even when the audio switching instruction is generated, the AV amplifier 25 can achieve temporal synchronization with the video output from the TV 35 when outputting audio. In other words, the AV amplifier 25 does not depend on the video output processing delay amount described in the EDID 353a, and does not receive a CEC message every time an audio switching instruction of the own device is generated. Synchronization with the audio output from the amplifier 25 can be achieved.
- the TV 35 does not change the video output processing delay amount of the EDID 353a, it is not necessary to recognize the audio switching instruction in the AV amplifier 25. That is, since only the AV amplifier 25 needs to recognize the audio switching instruction of the own device, it is possible to easily correct the change in the lip sync deviation amount.
- the TV 35 since the TV 35 does not need to recognize the audio switching of the AV amplifier 25, it can easily correct the change in the amount of lip sync deviation.
- the video output processing delay amount corresponding to the transmission path is transmitted to the audio output device, even when the audio output in the audio output device is switched, It is possible to quickly synchronize the output of video and audio.
- it is not necessary to transmit a control message each time the sound output in the audio output device is switched an increase in the transmission amount of the control message can be suppressed.
- the TV 35 spontaneously transmits a CEC message including the video output processing delay amount to the AV amplifier 25 has been described, but when the CEC message received from the AV amplifier 25 is received as an inquiry.
- the TV may respond with a CEC message including information indicating the video output processing delay amount.
- the video output processing delay amount is described in the EDID 353a of the TV 35, and the audio output unit 264 of the AV amplifier 25 acquires the video output processing delay amount from the EDID information acquisition unit 253.
- the present invention is not limited to this.
- the video output processing delay amount compliant with the HDMI standard Version 1.3a may not be described in the EDID 353a.
- the present invention can be realized not only as such a video / audio data synchronization method but also as a program for causing a computer to execute the steps executed in such a video / audio data synchronization method.
- a program can be distributed via a recording medium such as a CD-ROM or a transmission medium such as the Internet.
Abstract
Description
High-Definition Multimedia Interface Specification Version 1.3a
10 DVDレコーダ
10PO、20PO、25PO HDMI出力ポート
20、25 AVアンプ
20PI、25PI、30PI、35PI HDMI入力ポート
25PIa アナログ音声入力ポート
25PId 光デジタル音声入力ポート
30、35 TV
35POa アナログ音声出力ポート
35POd 光デジタル音声出力ポート
101、201、251 HDMI出力部
101a、201a、207a、251a、257a、301a、351a HPD端子
101b、201b、207b、251b、257b、301b、351b DDC端子
101c、201c、207c、251c、257c、301c、351c TMDS端子
101d、201d、207d、251d、257d、301d、351d CEC端子
102、202、252 HPD切替検出部
103、203、253 EDID情報取得部
104、204、254 認証/暗号部
105、205、255、307、357 CEC機器連携部
106 デコード部
107 TMDSエンコード部
108 TMDS出力部
205a、255a 映像出力処理遅延量取得部
206、256 TMDS出力部
207、257、301、351 HDMI入力部
208、258、302、352 EDID設定部
209、259、303、353 EDID記憶部
209a、259a、303a、353a EDID
210、260、304、354 HPD制御部
210a、260a、304a、354a HPD信号
211、261、305、355 TMDS入力部
212、262、306、356 認証/復号部
213、263、308、358 TMDSデコード部
214、264、310、360 音声出力部
265 光デジタル音声入力部
266 アナログ音声入力部
267 音声入力切替部
307a、357a 映像出力処理遅延量設定部
309、359 映像出力部
361 入力切替部
362 チューナデコード部
363 光デジタル音声出力部
364 アナログ音声出力部
本発明の実施の形態1における映像音声データ同期方法では、映像データ及び音声データの送受信のための機器の接続が有効である時に映像出力フォーマットが変更になるなどにより映像出力機器の映像出力処理遅延量が変化した場合に、映像出力機器は、制御メッセージにより、変化した映像出力処理遅延量を通知する。つまり、映像出力機器は、音声出力機器に対して一方向に送信するEDIDの映像出力処理遅延量を変更しない。すなわち、映像出力機器は、HPD信号により接続を一旦無効化し、有効化するという、開示トリガを発生させる必要がない。そして、音声出力機器は、接続開始時に映像出力機器から読み出したEDIDから得られる映像出力処理遅延量よりも、後から制御メッセージにより通知された映像出力処理遅延量の方を優先して用いて、音声を出力するタイミングを調整する。
図13は、本発明の実施の形態2におけるHDMI接続された映像音声出力システム2の構成を示す図である。この映像音声出力システム2は、DVDレコーダ10、AVアンプ25、及びTV35により構成される。本実施の形態に係る映像音声出力システム2が、図4に示す実施の形態1に係る映像音声出力システム1と異なる点は、AVアンプ25とTV35とがHDMIケーブルに加えて、第1音声ケーブル(以下、「光デジタル音声ケーブル」という。)及び第2音声ケーブル(以下、「アナログ音声ケーブル」という。)によって接続されている点などである。なお、DVDレコーダ10は、図4に示す実施の形態1のDVDレコーダ10と同一の機能を有するので説明を省略する。
Claims (11)
- 互いに所定のインターフェースにより接続された、音声出力機器と映像出力機器とを備える映像音声出力システムにおいて、前記音声出力機器から出力される音声と前記映像出力機器から出力される映像とを同期させるための映像音声データ同期方法であって、
前記インターフェースは、映像データを前記音声出力機器から前記映像出力機器へ一方向に伝送可能であり、かつ、前記映像出力機器の再生能力を示す再生能力情報と前記映像出力機器の接続状態の有効性を示す接続状態情報とを前記映像出力機器から前記音声出力機器へ一方向に伝送可能であり、かつ、制御メッセージを双方向に伝送可能であり、
前記映像音声データ同期方法は、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記映像出力機器が正当な機器であることを認証する認証ステップと、
前記認証ステップにおける認証が成功した場合、前記接続状態情報が有効であることを示す間、映像データを前記音声出力機器から前記映像出力機器へ前記インターフェースを通じて送信する映像データ送信ステップと、
前記映像出力機器が、前記映像データ送信ステップで送信された映像データに基づいて映像を出力する映像出力ステップと、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記音声出力機器が、前記映像出力機器による映像出力に要する時間である第1遅延量を示す情報を含む前記再生能力情報を、前記映像出力機器から前記インターフェースを通じて取得する第1遅延量取得ステップと、
前記音声出力機器が、前記第1遅延量取得ステップで取得された第1遅延量に基づいて、音声を出力するタイミングを調整する第1音声出力ステップと、
前記映像出力機器が、前記映像出力ステップで映像出力に要する時間を第2遅延量として取得する第2遅延量取得ステップと、
前記接続状態情報が有効であることを示すときに、前記第2遅延量取得ステップで取得された第2遅延量を示す情報を含む制御メッセージを、前記映像出力機器から前記音声出力機器へ前記インターフェースを通じて送信する遅延量送信ステップと、
前記音声出力機器が、前記遅延量送信ステップで送信された第2遅延量に基づいて、音声を出力するタイミングを調整する第2音声出力ステップとを含む
映像音声データ同期方法。 - 前記映像出力機器は、前記接続状態情報が無効を示すときに書き換え可能なメモリであり、前記第1遅延量を格納しているメモリを備え、
前記第1遅延量取得ステップにおいて、前記メモリに格納された第1遅延量を示す情報を含む前記再生能力情報を取得し、
前記遅延量送信ステップにおいて、前記メモリに格納された第1遅延量を更新しない
請求項1に記載の映像音声データ同期方法。 - さらに、前記接続状態情報が有効から無効に変化したことを示すときに、前記第2遅延量取得ステップで取得された第2遅延量を前記第1遅延量として前記メモリに書き込む遅延量書込ステップを含む
請求項2に記載の映像音声データ同期方法。 - 前記第1遅延量は、前記映像出力機器により予め一意に定まる固定の時間である
請求項1に記載の映像音声データ同期方法。 - 前記遅延量送信ステップにおいて、前記接続状態情報が有効から無効へ変化したことを示した際に前記第2遅延量取得ステップで取得された第2遅延量を、前記第1遅延量として送信する
請求項1に記載の映像音声データ同期方法。 - 前記遅延量送信ステップにおいて、前記第1遅延量取得ステップで取得された第1遅延量又は前に前記遅延量送信ステップで送信された第2遅延量と前記第2遅延量取得ステップで取得された第2遅延量との差分値が所定閾値を超える場合、前記第2遅延量取得ステップで取得された第2遅延量を送信する
請求項1に記載の映像音声データ同期方法。 - さらに、前記第2遅延量の送信を要求する情報を含む制御メッセージを、前記音声出力機器から前記映像出力機器へ送信する遅延量要求ステップを含み、
前記遅延量送信ステップにおいて、前記遅延量要求ステップで制御メッセージが送信された場合、前記第2遅延量を送信する
請求項1に記載の映像音声データ同期方法。 - 所定のインターフェース、第1音声ケーブル及び第2音声ケーブルにより互いに接続された、音声出力機器と映像出力機器とを備える映像音声出力システムにおいて、前記音声出力機器から出力される音声と前記映像出力機器から出力される映像とを同期させるための映像音声データ同期方法であって、
前記インターフェースは、映像データ及び第1音声データを前記音声出力機器から前記映像出力機器へ一方向に伝送可能であり、かつ、制御メッセージを双方向に伝送可能であり、
前記第1音声ケーブルは、第2音声データを前記映像出力機器から前記音声出力機器へ伝送可能であり、
前記第2音声ケーブルは、第3音声データを前記映像出力機器から前記音声出力機器へ伝送可能であり、
前記映像音声データ同期方法は、
前記映像出力機器が映像を出力する際に要する時間である第1遅延量と、前記第1音声ケーブルにより伝送される第2音声データを前記音声出力機器が出力する場合に、映像出力に要する時間である第2遅延量と、前記第2音声ケーブルにより伝送される第3音声データを前記音声出力機器が出力する場合に、映像出力に要する時間である第3遅延量とを、前記映像出力機器から前記音声出力機器へ送信する遅延量送信ステップと、
前記インターフェースを通じて伝送される第1音声データ、前記第1音声ケーブルを通じて伝送される第2音声データ及び前記第2音声ケーブルを通じて伝送される第3音声データのいずれに基づいて音声を出力するかを指示する音声切替ステップと、
前記音声切替ステップで前記第1音声データに基づいて音声を出力することを指示された場合、前記音声出力機器が、前記遅延量送信ステップで送信された第1遅延量に基づいて音声を出力するタイミングを調整し、前記音声切替ステップで前記第2音声データに基づいて音声を出力することを指示された場合、前記音声出力機器が、前記遅延量送信ステップで送信された第2遅延量に基づいて音声を出力するタイミングを調整し、前記音声切替ステップで前記第3音声データに基づいて音声を出力することを指示された場合、前記音声出力機器が、前記遅延量送信ステップで送信された第3遅延量に基づいて音声を出力するタイミングを調整する音声出力ステップとを含む
映像音声データ同期方法。 - 所定のインターフェースにより音声出力機器と接続された映像出力機器であって、
前記インターフェースは、映像データを前記音声出力機器から前記映像出力機器へ一方向に伝送可能であり、かつ、前記映像出力機器の再生能力を示す再生能力情報と前記映像出力機器の接続状態の有効性を示す接続状態情報とを前記映像出力機器から前記音声出力機器へ一方向に伝送可能であり、かつ、制御メッセージを双方向に伝送可能であり、
前記映像出力機器は、
映像データを前記音声出力機器から前記インターフェースを通じて受信する映像データ受信部と、
前記映像データ受信部により受信された映像データに基づいて映像を出力する映像出力部と、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記映像出力部による映像出力に要する時間である第1遅延量を示す情報を含む前記再生能力情報を、前記音声出力機器へ前記インターフェースを通じて送信する第1遅延量送信部と、
前記接続状態情報が有効であることを示すときに、前記映像出力部による映像出力に要する時間である第2遅延量を示す情報を含む制御メッセージを、前記音声出力機器へ前記インターフェースを通じて送信する第2遅延量送信部とを備える
映像出力機器。 - 所定のインターフェースにより映像出力機器と接続された音声出力機器であって、
前記インターフェースは、映像データを前記音声出力機器から前記映像出力機器へ一方向に伝送可能であり、かつ、前記映像出力機器の再生能力を示す再生能力情報と前記映像出力機器の接続状態の有効性を示す接続状態情報とを前記映像出力機器から前記音声出力機器へ一方向に伝送可能であり、かつ、制御メッセージを双方向に伝送可能であり、
前記音声出力機器は、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記映像出力機器が正当な機器であることを認証する認証部と、
前記認証部による認証が成功した場合、前記接続状態情報が有効であることを示す間、映像データを前記映像出力機器へ前記インターフェースを通じて送信する映像データ送信部と、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記映像出力機器による映像出力に要する時間である第1遅延量を示す情報を含む前記再生能力情報を、前記映像出力機器から前記インターフェースを通じて受信する第1遅延量受信部と、
前記接続状態情報が有効であることを示すときに、前記映像出力機器によりその映像出力に要する時間である第2遅延量を示す情報を含む制御メッセージを、前記映像出力機器から前記インターフェースを通じて受信する第2遅延量受信部と、
前記第1遅延量受信部により受信された第1遅延量及び前記第2遅延量受信部により取得された第2遅延量のいずれか一方を用いて、音声を出力するタイミングを調整する音声出力部とを備える
音声出力機器。 - 互いに所定のインターフェースにより接続された、音声出力機器と映像出力機器とを備える映像音声出力システムであって、
前記インターフェースは、映像データを前記音声出力機器から前記映像出力機器へ一方向に伝送可能であり、かつ、前記映像出力機器の再生能力を示す再生能力情報と前記映像出力機器の接続状態の有効性を示す接続状態情報とを前記映像出力機器から前記音声出力機器へ一方向に伝送可能であり、かつ、制御メッセージを双方向に伝送可能であり、
前記映像出力機器は、
映像データを前記音声出力機器から前記インターフェースを通じて受信する映像データ受信部と、
前記映像データ受信部により受信された映像データに基づいて映像を出力する映像出力部と、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記映像出力部による映像出力に要する時間である第1遅延量を示す情報を含む前記再生能力情報を、前記音声出力機器へ前記インターフェースを通じて送信する第1遅延量送信部と、
前記接続状態情報が有効であることを示すときに、その映像出力に要する時間である第2遅延量を示す情報を含む制御メッセージを、前記音声出力機器へ前記インターフェースを通じて送信する第2遅延量送信部とを備え、
前記音声出力機器は、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記映像出力機器が正当な機器であることを認証する認証部と、
前記認証部による認証が成功した場合、前記接続状態情報が有効であることを示す間、映像データを前記映像出力機器へ前記インターフェースを通じて送信する映像データ送信部と、
前記接続状態情報が無効から有効へ変化したことを示すときに、前記第1遅延量を示す情報を含む前記再生能力情報を、前記映像出力機器から前記インターフェースを通じて受信する第1遅延量受信部と、
前記接続状態情報が有効であることを示すときに、前記第2遅延量を示す情報を含む制御メッセージを、前記映像出力機器から前記インターフェースを通じて受信する第2遅延量受信部と、
前記第1遅延量受信部により受信された第1遅延量及び前記第2遅延量受信部により受信された第2遅延量のいずれか一方を用いて、音声を出力するタイミングを調整する音声出力部とを備える
映像音声出力システム。
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