JP2009124223A - Av system - Google Patents

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Publication number
JP2009124223A
JP2009124223A JP2007293013A JP2007293013A JP2009124223A JP 2009124223 A JP2009124223 A JP 2009124223A JP 2007293013 A JP2007293013 A JP 2007293013A JP 2007293013 A JP2007293013 A JP 2007293013A JP 2009124223 A JP2009124223 A JP 2009124223A
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audio
adjustment amount
video
signal
audio adjustment
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JP2007293013A
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Masayoshi Aihara
正由 相原
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Sharp Corp
シャープ株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To adjust the time lag between video and a sound in each of a standard mode, a movie mode, a game mode and the like on the side of an external device, in an AV system wherein a display device and the external device are connected by HDMI. <P>SOLUTION: A TV 20 is connected to a DVD player 10 by HDMI. The TV 20 includes a video mode control part 22 for setting one of a plurality of video modes the user's operation of a remote controller R and a CEC I/F 23 for extracting a sound adjustment amount corresponding to the set video mode from a memory 29 and informing the DVD player 10 of the extracted sound adjustment amount by a CEC message. The DV player 10 receives and analyzes the CEC message from the TV 20 through a CEC I/F 15 to acquire the sound adjustment amount of the pertinent video mode, and a buffer control part 16 controls buffers 13 and 14 on the basis of the acquired sound adjustment amount, whereby the output timing of a video signal and that of a sound signal are adjusted, and then the signals are output from an HDMI transmitter 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an AV system, and more particularly, to an AV system in which a display device and an external device are connected by HDMI (High Definition Multimedia Interface) and the time difference between video and audio can be adjusted.

  The current television apparatus (television) requires various image processing and high image quality for displaying the content on a target display when reproducing broadcast content or content input from another recording medium. Various image quality improvement functions are provided to meet the above requirements. For example, a Y / C separation circuit for performing Y / C separation of a composite video signal, a noise reduction circuit for removing noise from an input video, an IP conversion circuit for converting an interlace signal into a progressive signal, and various other types The image quality improvement circuit is provided.

  In particular, in recent televisions, in the above Y / C separation circuit, noise reduction circuit, IP conversion circuit, and the like, a three-dimensional processing circuit that performs processing on the frames before and after the time axis in addition to the frame is frequently used. Yes.

In video processing such as image quality improvement as described above, input video signals are temporarily stored in a memory and then processed. In particular, a relatively large memory capacity is required in a three-dimensional processing circuit that performs processing for frames that are temporally mixed.
In this case, an input video signal is temporarily stored in the memory, and a time difference inevitably occurs until a new video signal is generated from the stored video. This time difference is, for example, a time difference corresponding to several frames. For example, in the case of a video signal of 25 frames / second, the delay time corresponds to several times 1/25 seconds.

  When receiving and reproducing normal broadcast content on such a television, the television sets the timing by delaying the audio output by the delay of the video output. This is called a so-called lip sync function. With this lip sync function, the user can view content without a sense of incongruity.

  For example, Patent Document 1 describes a technique that can eliminate a time lag between video and audio between devices connected to a network. According to this, the monitor, the DVD player, and the amplifier are connected to the network, video and audio information are supplied from the DVD player to the network, the monitor acquires and displays the video information from the network, and the amplifier acquires the audio information from the network. ·Output. The monitor is provided with means for transmitting delay time information for video display with respect to the sound, and the amplifier delays the sound based on this delay time information so that the time lag between the video and the sound can be eliminated.

Incidentally, HDMI is widely used as one of digital interfaces for digitally connecting between external devices such as a television and a recorder. HDMI is arranged for AV equipment by adding an audio transmission function and a copyright protection function to DVI, which is a standard for connecting a PC and a display.
Conventionally, a plurality of cables for video, audio, and control signals are used for connection between devices. However, since only one cable is required for HDMI, wiring between devices can be simplified.

  The HDMI standard, HDMI Licensing, LLC, established a basic specification in December 2002 (HDMI standard Ver1.0), and the control between AV devices in December 2005 (HDMI standard version 1.2a). A regulation of CEC (Consumer Electronics Control) has been added as a control protocol for performing.

  Terms related to CEC are defined in “2.2 Glossary of Terms” and “CEC 2.2 Glossary of Terms” of the HDMI standard, and those that have an HDMI input terminal and display and output an AV stream are a sink device. A device that has an HDMI output terminal and outputs an AV stream is defined as a source device, and a device that has an HDMI input terminal and an output terminal and performs input / output (transfer) of an AV stream is defined as a repeater device. .

  In the HDMI standard, inter-device control using CEC is defined. According to this CEC, various controls are possible based on a specific physical address and logical address assigned to each device existing on the HDMI network. For example, when a user plays a digital broadcast on a television and plays a DVD player connected via HDMI, the television automatically switches to the input connected to the DVD player. Further, menu operations displayed on the DVD player, power on / off, and the like can be operated from a television remote controller.

Also in this HDMI, the above-mentioned lip sync function is added from the version 1.3a of the HDMI standard.
FIG. 6 is a diagram for explaining EDID for executing the lip sync function defined in the HDMI standard version 1.3a.
A sink device (hereinafter referred to as TV) conforming to the HDMI standard has EDID (Extended Display Identification Data) in an internal memory. This EDID is an ID unique to the TV for transmitting the model name and setting value (resolution, etc.) of the TV (monitor) to an external device (source device, etc.) connected to the TV. A control signal line (I2C) is used. For example, when a source device such as a DVD player is HDMI-connected to a TV, it can access the TV, read the EDID, and output a video with a resolution corresponding to the TV.

The EDID shown in FIG. 6 is stored in the internal memory of the TV, and describes the video and audio delay amounts (lip sync information) on the TV. A source device such as a DVD player can adjust and output the video and audio timings according to the EDID value read from the TV.
This lip sync information is in the same block as the physical address and deep color information, and is described so that the delay amount of video and audio on the TV can be set in 0 to 500 ms (2 ms units). Also, the video can be described as progressive or interlaced and different values. Note that Deep Color information is added in HDMI standard version 1.3a, and can support color depths up to 10/12 / 16bit (30/36 / 48bit) for each color by expanding the transmission band. is there.

For example, if the video delay amount is described as 30 ms and the audio delay amount is 0 ms in the EDID of the TV, it means that the delay is 30 ms from when the video and audio are received on the TV until the video is displayed on the screen. That is, the audio is output immediately without delay, while the video is output with a delay of 30 ms with respect to the audio. According to the lip sync function, when the source device acquires the delay information from the TV, the source device outputs the audio with a delay of 30 ms with respect to the video. As a result, the TV can output the video and audio at the same time.
JP 2002-344898 A

  In practice, however, the time difference between video and audio on the TV differs depending on the video mode (standard / movie / game etc.) of the TV, but since the EDID is a fixed value, it is constant regardless of the video mode. There is a problem of becoming. For example, in the movie mode, the video processing for improving the image quality takes time, so the audio is delayed with respect to the video. On the other hand, in the game mode, the immediacy is important, so the video and the audio are output simultaneously. ing. Specifically, the time difference between video and audio is about 33 ms in the former case and about 0 ms in the latter case, but about 16 ms, which is an average value of about 0 to 33 ms, is written as a fixed value in EDID. ing. Accordingly, when the source device acquires this delay information (16 ms) from the TV, the audio is output with a delay of 16 ms with respect to the video regardless of the video mode. As a result, since the video and audio are not synchronized in the movie mode and the game mode, the user feels uncomfortable.

  In the above, it is conceivable to rewrite the EDID of the TV in accordance with the change of the video mode. However, when changing the audio delay amount of EDID, it is necessary to read and rewrite the EDID after disconnecting the HDMI connection once. Therefore, it is not easy for general users.

  The invention described in the above-mentioned Patent Document 1 delays audio on the external device (amplifier) side using IEEE 1394 instead of HDMI. However, the difference in the video mode is not considered, and the TV The time difference between video and audio is always constant.

  The present invention has been made in view of the above-described circumstances. In an AV system in which a display device and an external device are HDMI-connected, video and audio for each video mode such as standard / movie / game on the external device side. The purpose is to be able to adjust the time lag.

  In order to solve the above problems, a first technical means of the present invention is an AV system including an external device that outputs video and audio signals, and a display device that is HDMI-connected to the external device, wherein the display The apparatus includes: a video mode setting unit that sets any one of a plurality of video modes; and an audio adjustment that stores, for each video mode, an audio adjustment amount for adjusting a time difference between the video signal and the audio signal in the display device A volume storage unit, a voice adjustment amount acquisition unit that acquires a voice adjustment amount according to the video mode set by the video mode setting unit from the voice adjustment amount storage unit, and notifies the external device of the acquired voice adjustment amount Audio adjustment amount notification means for adjusting the output timing of the video signal and the audio signal based on the audio adjustment amount notified by the audio adjustment amount notification means. It is obtained by, characterized in that force.

  According to a second technical means, in the first technical means, the external device is a reproduction device for reproducing and outputting video and audio signals.

  A third technical means is an AV system in which a display device and a playback device are HDMI-connected via a repeater device, and an audio signal from the playback device is output from the repeater device, and the display device includes a plurality of display devices. Video mode setting means for setting any one of the video modes; audio adjustment amount storage means for storing an audio adjustment amount for adjusting a time difference between the video signal and the audio signal in the display device for each video mode; An audio adjustment amount acquisition unit that acquires an audio adjustment amount according to the video mode set by the video mode setting unit from the audio adjustment amount storage unit; and an audio adjustment amount that notifies the repeater device of the acquired audio adjustment amount Notification means, and the repeater device sends an audio delay amount of the audio signal to the video signal by the audio processing of the repeater device by the audio adjustment amount notification means. Subtracting from the notified audio adjustment amount and notifying the playback device of the audio adjustment amount after the subtraction, the playback device is based on the audio adjustment amount after the subtraction notified from the repeater device And the output timing of the audio signal is adjusted and output.

  A fourth technical means is an AV system in which a display device and a playback device are HDMI-connected via a repeater device, and an audio signal from the playback device is output from the repeater device. The display device includes a plurality of display devices. Video mode setting means for setting any one of the video modes; audio adjustment amount storage means for storing an audio adjustment amount for adjusting a time difference between the video signal and the audio signal in the display device for each video mode; An audio adjustment amount acquisition unit that acquires an audio adjustment amount according to the video mode set by the video mode setting unit from the audio adjustment amount storage unit; and an audio adjustment amount that notifies the repeater device of the acquired audio adjustment amount Notification means, and the repeater device sends an audio delay amount of the audio signal to the video signal by the audio processing of the repeater device by the audio adjustment amount notification means. Subtracted from the notified audio adjustment amount, based on the audio adjustment amount and the audio delay amount after subtraction is obtained by and outputs by adjusting the output timing of the video signal and audio signal.

  According to a fifth technical means, in the fourth technical means, the repeater device inputs video and audio signals transmitted from the reproducing device simultaneously.

  A sixth technical means is any one of the third to fifth technical means, wherein the repeater device transfers a video signal from the reproduction device to the display device, and outputs an audio signal from a speaker as an audio signal. It is characterized by being an amplifier.

  A seventh technical means is the CEC interface according to any one of the first to sixth technical means, wherein the audio adjustment amount notification means transmits a CEC message for notifying an audio adjustment amount of the display device. It is characterized by that.

  An eighth technical means is the first technical means according to any one of the first to seventh technical means, wherein the video mode setting means is a first mode in which the audio adjustment amount is maximum and the audio adjustment amount is minimum as the video mode. The second mode can be set, and the third mode that is the average of these second modes can be set.

According to the present invention, in an AV system in which a display device and an external device are HDMI-connected, the time difference between video and audio can be adjusted for each video mode such as standard / movie / game on the external device side. Video and audio timing can be the same in any video mode.
In addition, since the video and audio timing is adjusted on the external device side such as a playback device or a repeater device, it is not necessary to provide a buffer or the like for adjusting the timing on the display device side.

  Hereinafter, preferred embodiments of the AV system of the present invention will be described with reference to the accompanying drawings. In the embodiment of the present invention, a CEC message included in the HDMI standard is used. This CEC message is a device control signal standardized by HDMI.

(First embodiment)
FIG. 1 is a block diagram showing a configuration example of a main part of an AV system according to the first embodiment of the present invention. In FIG. 1, 10 is an external device (hereinafter represented by a DVD player), and 20 is a display device (hereinafter represented by , Represented by TV). The DVD player 10 includes a video processing unit 11 that processes a video signal of the DVD 18, an audio processing unit 12 that processes an audio signal of the DVD 18, a video buffer 13 for temporarily storing the video signal, and an audio signal. An audio buffer 14 for temporarily storing; a CEC interface (CEC I / F) 15 for transmitting and receiving CEC messages; a buffer control unit 16 for controlling the video buffer 13 and the audio buffer 14; And an HDMI transmitter 17 for transmitting video and audio signals.

  The TV 20 also receives a remote control light receiving unit 21 that receives an operation signal from the remote control R, a video mode control unit 22 that acquires an audio adjustment amount corresponding to the video mode selected by the remote control R from the memory 29, and a CEC message. CEC I / F 23 for transmitting / receiving, HDMI receiver 24 for receiving video and audio signals, video processing unit 25 for processing video signals, audio processing unit 26 for processing audio signals, and LCD for displaying video signals A display unit 27 such as (Liquid Crystal Display), a speaker 28 that outputs an audio signal as audio, and a memory 29 that stores an audio adjustment amount for each video mode.

  In the present embodiment, the DVD player 10 that is the source device and the TV 20 that is the sink device are HDMI-connected, and CEC messages can be transmitted and received between the devices. The DVD player 10 and the TV 20 are connected by an HDMI cable. This HDMI cable is a CEC line that is a bidirectional bus that transmits a common control signal (CEC message) between devices, and a TMDS (Transition Minimized Differential) that transmits video and audio signals that are digital signals in a differential manner. Signaling) line (digital signal line). In addition, the HDMI cable includes an I2C line used for EDID transmission, HDCP (High-bandwidth Digital Content Protection system) authentication, and the like.

  Note that the external device of the present invention refers to a source device or repeater device that can be HDMI-connected to a sink device such as a TV. The source device is not limited to a playback-only DVD player, but a DVD recorder, HDD recorder, Recording / playback devices such as a BD (Blu-ray) recorder are also included, and repeater devices include an AV amplifier that can output sound.

Here, a logical address and a physical address in CEC will be briefly described.
First, logical addresses can be handled from 0 to 15 in the HDMI CEC standard, and are the only names in the HDMI network. This logical address differs depending on the type of external device.

  The physical address is the only name in the HDMI network, but is automatically adjusted when an external device is added to or disconnected from the HDMI network. The physical address has a five-layer address and is composed of a unique number n in the same layer, n. n. n. Expressed in n form. When the hierarchy of the external device directly connected to the display device is the first hierarchy, the external device connected to the first hierarchy device becomes the second hierarchy, and the hierarchy number is increased as the distance from the display device increases. The above format n. n. n. The hierarchy number is expressed so as to increase from n at the left end of n to the right.

  Since the external device connected to the display device via HDMI has such a logical address and physical address, even if a plurality of external devices are connected, a specific one device is specified and a CEC message is transmitted. It becomes possible.

  The main feature of the present invention is that, in an AV system in which a display device and an external device are HDMI-connected, the external device adjusts the time difference between video and audio for each video mode such as standard / movie / game. . As a configuration for this, the TV 20 includes a memory 29 corresponding to an audio adjustment amount storage unit that stores an audio adjustment amount for adjusting the time difference between the video signal and the audio signal in the TV 20 for each video mode, and an image mode setting unit. A video mode control unit 22 corresponding to an audio adjustment amount acquisition unit that acquires the audio adjustment amount according to the video mode set by the memory 29, and an audio adjustment amount notification unit that notifies the DVD player 10 of the acquired audio adjustment amount. A corresponding CEC I / F 23 is provided. Note that the video mode control unit 22 also functions as video mode setting means for setting any one of a plurality of video modes. This audio adjustment amount is notified by a CEC message. As this CEC message, for example, a vendor message uniquely defined by the manufacturer can be used.

  The DVD player 10 is a playback device that plays back and outputs video and audio signals. The DVD player 10 adjusts the output timing of the video and audio signals based on the audio adjustment amount notified by the CEC message from the CEC I / F 23. Each means for outputting (video buffer 13, audio buffer 14, and buffer control unit 16) is provided. In the present embodiment, the external device connected to the TV 20 is the DVD player 10 as the source device. However, as shown in the second embodiment described later, the source device may be connected via a repeater device. Good.

  In FIG. 1, the memory 29 stores the audio adjustment amount for each video mode in advance. This audio adjustment amount is for adjusting the time difference between the video signal and the audio signal resulting from the video processing inside the TV, and is different for each video mode. For example, a movie mode corresponding to the first mode in which the audio adjustment amount is maximum, a game mode corresponding to the second mode in which the audio adjustment amount is minimum, and a standard corresponding to the third mode that is the average of these modes Assume that audio adjustment amounts of about 33 ms, about 0 ms, and about 16 ms are stored for each mode. When the user operates the remote controller R to select one of the video modes, the video mode control unit 22 sets the video mode selected by the user to the TV 20 and an audio adjustment amount corresponding to the video mode. Is obtained from the memory 29. Then, the video mode control unit 22 controls the CEC I / F 23 to transmit the CEC message for notifying the audio adjustment amount acquired from the memory 29 to the DVD player 10.

  The DVD player 10 receives and analyzes the CEC message from the TV 20 via the CEC I / F 15, and acquires the audio adjustment amount of the video mode. Then, the buffer control unit 16 adjusts the output timing of the video signal and the audio signal by controlling the video buffer 13 and the audio buffer 14 based on the acquired audio adjustment amount, so that the video signal and the audio signal are adjusted. Are separately output from the HDMI transmitter 17.

  For example, if the video mode selected by the user is the movie mode, the video signal is delayed by 33 ms with respect to the audio signal in the TV 20, so the audio adjustment amount is 33 ms. In this case, the DVD player 10 outputs the audio signal with a delay of 33 ms with respect to the video signal. As a result, even if the TV 20 takes 33 ms for video processing for improving the image quality of the video signal, the audio signal is delayed by the same time (33 ms). Will match.

  On the other hand, if the video mode selected by the user is the game mode, the TV 20 does not cause a delay in the video signal with respect to the audio signal, so the audio adjustment amount is 0 ms. In this case, the DVD player 10 outputs the audio signal simultaneously without delaying the video signal. Since the TV 20 omits the video processing for the video signal in the game mode, the TV 20 can simultaneously output the video and audio from the DVD player 10.

  FIG. 2 is a diagram for explaining an example of an audio delay adjustment process when the video mode is changed in the AV system shown in FIG. First, when the TV 20 detects that the video mode has been changed by the user's operation of the remote controller R (S1), the TV 20 notifies the DVD player 10 of the audio adjustment amount corresponding to the video mode by a CEC message (S2). The DVD player 10 analyzes the CEC message received from the TV 20 and acquires the audio adjustment amount corresponding to the video mode. Then, the DVD player 10 adjusts the output timing of the video signal and the audio signal based on the acquired audio adjustment amount, and outputs the video signal and the audio signal separately from the HDMI transmitter 17 (S3).

(Second Embodiment)
FIG. 3 is a block diagram showing a configuration example of a main part of an AV system according to the second embodiment of the present invention. The system configuration of the present embodiment is different from the system configuration of the first embodiment described above in that the TV 20 and the DVD player 10 are HDMI-connected via a repeater device (hereinafter represented by an AV amplifier) 30. . The AV amplifier 30 is a repeater device that can transfer video and audio signals. By connecting a speaker 36 for audio output, the AV amplifier 30 transfers and outputs the video signal from the DVD player 10 to the TV 20, and the audio signal is output to the speaker 36. You can also output audio from Since the TV 20 and the DVD player 10 have the same configuration as that of the first embodiment described above, the description thereof is omitted here.

  The AV amplifier 30 includes a CEC I / F 31 for transmitting and receiving CEC messages, a buffer control unit 32 that controls the audio buffer 35, an HDMI receiver 33 that receives video and audio signals, and audio processing that processes audio signals. Unit 34, an audio buffer 35 for buffering audio signals, a speaker 36 for outputting audio signals as audio, and an HDMI transmitter 37 for transmitting video and audio signals.

  When the audio signal from the DVD player 10 is configured to pass through the AV amplifier 30 and is output from the speaker 28 of the TV 10 as described above, the AV amplifier 30 generates a time difference between the video signal and the audio signal. Therefore, as in the case of the first embodiment, the DVD player 10 may adjust and output the output timing of the video signal and the audio signal according to the audio adjustment amount from the TV 20.

  However, when the audio signal from the DVD player 10 is output from the speaker 36 of the AV amplifier 30, the audio signal in the AV amplifier 30 is delayed due to the internal audio processing. Therefore, even if the DVD player 10 adjusts and outputs the output timing of the video signal and the audio signal according to the audio adjustment amount from the TV 20 as described above, the video from the TV 20 is caused by the audio delay in the AV amplifier 30. The output timing of the signal and the output timing of the audio signal from the AV amplifier 30 are shifted.

  Therefore, when audio is output from the speaker 36 of the AV amplifier 30, the TV 20 transmits a CEC message notifying the audio adjustment amount to the AV amplifier 30. Since the TV 20 can recognize whether the output destination of the audio signal is the TV 20 or the AV amplifier 30, if the TV 20 recognizes that the output destination of the audio signal is the AV amplifier 30, the TV 20 receives the CEC. On the other hand, when the output destination of the audio signal is recognized as the TV 20, the CEC message is transmitted to the TV 20.

  In FIG. 3, when a video mode is selected by a user operation, the TV 20 acquires an audio adjustment amount corresponding to the video mode from the memory 29. Then, the TV 20 controls the CEC I / F 23 and transmits this audio adjustment amount to the AV amplifier 30 by a CEC message.

  The AV amplifier 30 receives and analyzes the CEC message from the TV 20 via the CEC I / F 31 and acquires the audio adjustment amount of the video mode. The AV amplifier 30 subtracts the audio delay amount of the audio signal with respect to the video signal by the audio processing of the AV amplifier 30 from the audio adjustment amount acquired from the TV 20, and notifies the DVD player 10 of the audio adjustment amount after the subtraction. Note that the audio delay amount of the AV amplifier 30 is held in advance in a memory (not shown) of the AV amplifier 30 as a fixed value.

  The DVD player 10 receives and analyzes the CEC message from the AV amplifier 30 via the CEC I / F 15, and acquires the audio adjustment amount after subtraction of the video mode. Then, the buffer control unit 16 controls the video buffer 13 and the audio buffer 14 based on the audio adjustment amount after the subtraction, thereby adjusting the output timing of the video signal and the audio signal, so that the video signal and the audio signal are adjusted. The signals are separately output from the HDMI transmitter 17.

  In this embodiment, for example, when the video mode selected by the user is the movie mode, if the audio adjustment amount on the TV 20 is 33 ms and the audio delay amount on the AV amplifier 30 is 5 ms, the DVD player 10 Is notified of an audio adjustment amount of 28 (33-5) ms. In response to the audio adjustment amount, the DVD player 10 outputs the audio signal with a delay of 28 ms with respect to the video signal.

  Even if the TV 20 takes 33 ms to process the video signal for improving the image quality, the DVD player 10 outputs the audio signal with a delay of 28 ms with respect to the video signal, and the AV amplifier 30 outputs the audio signal to the video signal. By delaying the signal by 5 ms, the AV amplifier 30 outputs the audio signal from the speaker 36 with a delay of the same time (33 ms) as the video processing in the TV 20, so that the video signal from the TV 20 and the AV amplifier 30 are output. The output timings of the audio signals from are matched.

  On the other hand, when the video mode selected by the user is the game mode, the audio adjustment amount at the TV 20 is 0 ms and the audio delay amount at the AV amplifier 30 is 5 ms in order to omit video processing on the video signal. The DVD player 10 is notified of the audio adjustment amount of −5 (0-5) ms. In this case, in order to match the output timing from the AV amplifier 30, it is necessary to output the audio signal 5 ms earlier than the video signal. In response to the audio adjustment amount, the DVD player 10 outputs the audio signal to the video signal by -5 ms, that is, the audio signal is output 5 ms earlier than the video signal (or the video signal is output 5 ms later than the audio signal). To do.

  In the AV amplifier 30, the audio signal from the DVD player 10 is input 5 ms earlier than the video signal, and the audio signal is delayed by 5 ms from the video signal in the audio processing unit 34, so that the time difference between the video signal and the audio signal is increased. Offset. As a result, since the AV amplifier 30 outputs the audio signal from the speaker 36 without delay with respect to the video signal, the output timing of the video signal from the TV 20 and the audio signal from the AV amplifier 30 coincides.

  FIG. 4 is a diagram for explaining an example of an audio delay adjustment process when the video mode is changed in the AV system shown in FIG. First, when the TV 20 detects that the video mode has been changed by the user's operation of the remote controller R (S11), the TV 20 notifies the AV amplifier 30 of the audio adjustment amount corresponding to the video mode by a CEC message (S12). The AV amplifier 30 analyzes the CEC message received from the TV 20 and acquires an audio adjustment amount corresponding to the video mode. Then, the AV amplifier 30 subtracts the audio delay amount at the AV amplifier 30 from the audio adjustment amount notified from the TV 20 (S13), and notifies the DVD player 10 of the audio adjustment amount after the subtraction with a CEC message (S14). . The DVD player 10 adjusts the output timing of the video signal and the audio signal based on the audio adjustment amount from the AV amplifier 30, and outputs the video signal and the audio signal separately from the HDMI transmitter 17 (S15).

In the above embodiment, since the time difference between video and audio is adjusted using the buffer function of the DVD player 10, the audio buffer 35 of the AV amplifier 30 may be unnecessary.
Also, the AV amplifier 30 notifies the DVD player 10 of the audio adjustment amount in the TV 20 and the audio delay amount in the AV amplifier 30 by a CEC message, and the DVD player 10 determines the audio delay amount in the AV amplifier 30 in the TV 20. You may subtract from the amount of sound adjustment in.

  Further, the present invention can be similarly applied even when a plurality of AV amplifiers are connected between the TV 20 and the DVD player 10. In this case, the audio adjustment amount of the TV 20 is notified by the CEC message to the AV amplifier that outputs audio among the plurality of AV amplifiers.

(Third embodiment)
As a modification of the above-described second embodiment, the time difference between video and audio may be adjusted using a buffer function on the AV amplifier side. This will be described below.

  In FIG. 3 described above, when a video mode is selected by a user operation, the TV 20 acquires an audio adjustment amount corresponding to the video mode from the memory 29. Then, the TV 20 controls the CEC I / F 23 and transmits this audio adjustment amount to the AV amplifier 30 by a CEC message.

  The AV amplifier 30 receives and analyzes the CEC message from the TV 20 via the CEC I / F 31 and acquires the audio adjustment amount of the video mode. The AV amplifier 30 subtracts the audio delay amount of the audio signal with respect to the video signal by the audio processing of the AV amplifier 30 from the audio adjustment amount acquired from the TV 20. The buffer control unit 32 controls the audio buffer 35 based on the audio adjustment amount after subtraction and the audio delay amount of the AV amplifier 30, so that the AV signal matches the output timing of the video signal on the TV 20. The output timing of the audio signal from the amplifier 30 is adjusted, and the audio is output from the speaker 36.

  In the present embodiment, the video and audio signals transmitted from the DVD player 10 are simultaneously input to the AV amplifier 30. For example, when the video mode selected by the user is the movie mode, the audio adjustment amount at the TV 20 is 33 ms, and if the audio delay amount at the AV amplifier 30 is 5 ms, the AV amplifier 30 performs the audio adjustment after subtraction. The amount is calculated as 28 (33-5) ms, and the audio signal is buffered in the audio buffer 35 for this time.

  In the TV 20, even if 33 ms is required for the video processing for improving the image quality of the video signal, the audio signal is delayed by 5 ms with respect to the video signal by the audio processing unit 34 of the AV amplifier 30, and further, Since the audio signal is output from the buffer 35 with a delay of 28 ms with respect to the video signal, the AV amplifier 30 outputs the audio signal from the speaker 36 with a delay of the same time (33 ms) as the video processing in the TV 20 as a result. Therefore, the output timing of the video signal from the TV 20 and the audio signal from the AV amplifier 30 coincide.

  On the other hand, when the video mode selected by the user is the game mode, the audio adjustment amount at the TV 20 is 0 ms and the audio delay amount at the AV amplifier 30 is 5 ms in order to omit video processing on the video signal. The AV amplifier 30 calculates the audio adjustment amount after subtraction as -5 (0-5) ms. In this case, in order to match the output timing from the AV amplifier 30, it is necessary to delay the video signal with respect to the audio signal. Therefore, the video signal is buffered in a video buffer (not shown) for this time.

  In the AV amplifier 30, the audio signal is output 5 ms behind the video signal by the audio processing unit 34, and further the video signal is output 5 ms delayed by a video buffer (not shown), thereby canceling the time difference between the video signal and the audio signal. Is done. As a result, since the AV amplifier 30 outputs the audio signal from the speaker 36 without delay with respect to the video signal on the TV 20, the output timing of the video signal from the TV 20 and the audio signal from the AV amplifier 30 coincides. .

  FIG. 5 is a diagram for explaining another example of the audio delay adjustment processing when the video mode is changed in the AV system shown in FIG. First, when the TV 20 detects that the video mode has been changed by the operation of the user's remote controller R (S21), the TV 20 notifies the AV amplifier 30 of the audio adjustment amount corresponding to the video mode by a CEC message (S22). The AV amplifier 30 analyzes the CEC message received from the TV 20 and acquires an audio adjustment amount corresponding to the video mode. Then, the AV amplifier 30 subtracts the audio delay amount in the AV amplifier 30 from the audio adjustment amount notified from the TV 20 (S23), and based on the audio adjustment amount after subtraction and the audio delay amount of the AV amplifier 30, The output timing of the video signal and the audio signal is adjusted, the video signal is output from the HDMI transmitter 37 to the TV 20, and the audio signal is output as audio from the speaker 36 (S25).

As described above, according to the present invention, in an AV system in which an external device and a display device are HDMI-connected, the time difference between video and audio can be adjusted for each video mode such as standard / movie / game on the external device side. The video and audio timing can be made the same in any video mode of the display device.
In addition, since the video and audio timing is adjusted on the external device side such as a playback device or a repeater device, it is not necessary to provide a buffer or the like for adjusting the timing on the display device side.

It is a block diagram which shows the example of a principal part structure of the AV system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating an example of the audio | voice delay adjustment process at the time of changing video mode in the AV system shown in FIG. It is a block diagram which shows the principal part structural example of the AV system which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating an example of the audio | voice delay adjustment process at the time of changing video mode in the AV system shown in FIG. It is a figure for demonstrating the other example of the audio | voice delay adjustment process at the time of changing video mode in the AV system shown in FIG. It is a figure for demonstrating EDID for performing the lip-sync function prescribed | regulated by HDMI specification version 1.3a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... External device (DVD player) 11, 25 ... Video processing part, 12, 26, 34 ... Audio processing part, 13 ... Video buffer, 14, 35 ... Audio buffer, 15, 23, 31 ... CEC I / F, 16, 32 ... Buffer control unit, 17, 37 ... HDMI transmitter, 18 ... DVD, 20 ... Display device (TV), 21 ... Remote control light receiving unit, 22 ... Video mode control unit, 24, 33 ... HDMI receiver, 27 ... Display unit, 28, 36 ... Speaker, 30 ... Repeater device (AV amplifier).

Claims (8)

  1. An AV system comprising an external device that outputs video and audio signals, and a display device connected to the external device via HDMI,
    The display device stores video mode setting means for setting any one of a plurality of video modes, and an audio adjustment amount for adjusting a time difference between the video signal and the audio signal in the display device for each video mode. Audio adjustment amount storage means, audio adjustment amount acquisition means for acquiring the audio adjustment amount according to the video mode set by the video mode setting means from the audio adjustment amount storage means, and the acquired audio adjustment amount for the external device A voice adjustment amount notification means for notifying
    The AV system, wherein the external device adjusts and outputs the output timing of the video signal and the audio signal based on the audio adjustment amount notified by the audio adjustment amount notification means.
  2.   2. The AV system according to claim 1, wherein the external device is a playback device that plays back and outputs video and audio signals.
  3. An AV system in which a display device and a playback device are HDMI-connected via a repeater device, and an audio signal from the playback device is output from the repeater device,
    The display device stores video mode setting means for setting any one of a plurality of video modes, and an audio adjustment amount for adjusting a time difference between the video signal and the audio signal in the display device for each video mode. Audio adjustment amount storage means, audio adjustment amount acquisition means for acquiring the audio adjustment amount according to the video mode set by the video mode setting means from the audio adjustment amount storage means, and the acquired audio adjustment amount for the repeater device A voice adjustment amount notification means for notifying
    The repeater device subtracts the audio delay amount of the audio signal with respect to the video signal resulting from the audio processing of the repeater device from the audio adjustment amount notified by the audio adjustment amount notification unit, and reproduces the audio adjustment amount after the subtraction Notify the device,
    The AV system, wherein the playback device adjusts and outputs an output timing of a video signal and an audio signal based on the audio adjustment amount after subtraction notified from the repeater device.
  4. An AV system in which a display device and a playback device are HDMI-connected via a repeater device, and an audio signal from the playback device is output from the repeater device,
    The display device stores video mode setting means for setting any one of a plurality of video modes, and an audio adjustment amount for adjusting a time difference between the video signal and the audio signal in the display device for each video mode. Audio adjustment amount storage means, audio adjustment amount acquisition means for acquiring the audio adjustment amount according to the video mode set by the video mode setting means from the audio adjustment amount storage means, and the acquired audio adjustment amount for the repeater device A voice adjustment amount notification means for notifying
    The repeater device subtracts the audio delay amount of the audio signal with respect to the video signal by the audio processing of the repeater device from the audio adjustment amount notified by the audio adjustment amount notification means, and the audio adjustment amount after the subtraction and the audio An AV system characterized by adjusting an output timing of a video signal and an audio signal on the basis of a delay amount.
  5.   5. The AV system according to claim 4, wherein the repeater device inputs video and audio signals transmitted from the playback device simultaneously.
  6.   6. The AV system according to claim 3, wherein the repeater device is an AV amplifier that transfers a video signal from the playback device to the display device and outputs an audio signal from a speaker. AV system characterized by
  7.   7. The AV system according to claim 1, wherein the audio adjustment amount notification means is a CEC interface that transmits a CEC message for notifying an audio adjustment amount of the display device. AV system.
  8.   8. The AV system according to claim 1, wherein the video mode setting means includes a first mode in which the audio adjustment amount is maximized as a video mode, and a second mode in which the audio adjustment amount is minimized. An AV system characterized in that a mode and an average of these modes can be set.
JP2007293013A 2007-11-12 2007-11-12 Av system Pending JP2009124223A (en)

Priority Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010146734A1 (en) * 2009-06-16 2010-12-23 パナソニック株式会社 Sound/image reproducing system, hearing aid, and sound/image processing device
JP2014207642A (en) * 2013-04-16 2014-10-30 日本放送協会 Lip-sync signal transmission device, synchronization shift amount estimation device, and synchronization shift amount estimation method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006053847A1 (en) * 2004-11-16 2006-05-26 Thomson Licensing Device and method for synchronizing different parts of a digital service
JP2007274409A (en) * 2006-03-31 2007-10-18 Sony Corp Video sound processing system, video processing device, voice processing device, output device of video sound, and synchronous processing method for video and sound

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006053847A1 (en) * 2004-11-16 2006-05-26 Thomson Licensing Device and method for synchronizing different parts of a digital service
JP2007274409A (en) * 2006-03-31 2007-10-18 Sony Corp Video sound processing system, video processing device, voice processing device, output device of video sound, and synchronous processing method for video and sound

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010146734A1 (en) * 2009-06-16 2010-12-23 パナソニック株式会社 Sound/image reproducing system, hearing aid, and sound/image processing device
JP2014207642A (en) * 2013-04-16 2014-10-30 日本放送協会 Lip-sync signal transmission device, synchronization shift amount estimation device, and synchronization shift amount estimation method

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