JP2009260441A - Content receiver and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the tone quality of voice data to be reproduced, when a tone quality preference mode is selected, even if image data is contained in content data transmitted from a DVD player. <P>SOLUTION: If a tone quality preference mode is set, an AV amplifier 20 distinguishes a format of voice data, and reads a minimum pixel clock frequency, which can transmit HDMI (High Definition Multimedia Interface) data corresponding to the distinguished format, from a pixel clock table then, makes a content transmitter transmit content data in resolution corresponding to the read pixel clock frequency. When the HDMI data is transmitted, the tone quality of voice data decreases as the pixel clock frequency of image data increases. Thereby, deterioration in the tone quality of the voice data can be suppressed by setting the pixel clock frequency at a minimum value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a content receiving apparatus that receives content data transmitted from a content transmitting apparatus.

HDMI (High Definition
A system in which a DVD player, an AV amplifier, and a display device compliant with the (Multimedia Interface) standard are connected via an HDMI cable is used. The DVD player reproduces video data and audio data from the DVD disc, and supplies the reproduced video data and audio data to the AV amplifier. The AV amplifier performs audio processing on the received audio data and outputs it to the speaker, and also outputs the video data to the display device. The display device displays the received video data.

  The AV amplifier is provided with a plurality of sound modes (for example, called a listening mode, a movie mode, a game mode, a music mode, etc.), and one sound mode can be selected by a user operation. The AV amplifier performs audio processing (delay processing, volume adjustment processing, equalizer processing, etc.) preset for the selected audio mode on the audio data.

  As one of the listening modes, a sound quality priority mode (also referred to as a pure audio mode) is provided. The sound quality priority mode is selected by a user operation when content that does not include video data such as a CD is played on a DVD player, for example, and the power supply voltage supplied to the video processing unit is turned off to operate the video processing unit. In this mode, the sound quality of the audio data is further improved by stopping the operation.

  Here, the audio data included in the HDMI data is included in the blanking period of the video data, and only the audio data cannot be transmitted / received as the HDMI data. That is, when content such as a CD or SACD that does not include video data is played back by the DVD player, the HDMI data includes a menu screen (or no signal) as video data. Therefore, even if the video processing unit is turned off in the sound quality priority mode, there is a problem that the sound quality of the audio data is deteriorated (for example, the S / N ratio is deteriorated) due to the influence of the video data included in the HDMI data.

JP-A-2005-57714

  An object of the present invention is to provide a content receiver capable of improving the sound quality of reproduced audio data even when video data is included in the content data transmitted from the DVD player when the sound quality priority mode is selected. It is.

  A content receiving apparatus according to a preferred embodiment of the present invention is connectable to a content transmitting apparatus that transmits content data including video data and audio data, and includes a receiving unit that receives the content data, and a plurality of sound quality priority modes. Voice mode setting means for setting one voice mode in response to a user operation from the voice modes, and voice processing corresponding to the voice mode set by the voice mode setting means for voice data included in the content data. Audio processing means to be executed, and transmission control means for causing the content transmission device to transmit the content data at the lowest pixel clock frequency at which the content data can be transmitted when the sound quality priority mode is set by the audio mode setting means With.

  When the sound quality priority mode is set, the transmission control unit causes the content transmission apparatus to transmit the content data at the lowest pixel clock frequency at which the content data can be transmitted. When transmitting content data including video data and audio data, the sound quality of the audio data is degraded as the pixel clock frequency of the video data is increased. Therefore, deterioration of sound quality of audio data can be suppressed by setting the pixel clock frequency to the minimum value.

  Preferably, when a sound quality priority mode is set by the audio mode setting unit, the transmission control unit transmits the content to the content transmission device at a resolution corresponding to the lowest pixel clock frequency at which the content data can be transmitted. Send data.

  In this case, the pixel clock frequency can be lowered by causing the transmission control means to lower the resolution of the video data included in the content data.

  Preferably, a storage unit in which a pixel clock frequency capable of transmitting the content data is registered in advance in association with each format of the audio data included in the content data, and the content data received by the receiving unit includes Format discriminating means for discriminating the format of audio data, and the transmission control means reads out the lowest pixel clock frequency from among the pixel clock frequencies corresponding to the format discriminated by the format discriminating means from the storage unit. The content transmission device is caused to transmit the content data at a resolution corresponding to the lowest pixel clock frequency.

  In this case, even if the pixel clock capable of transmitting content data differs depending on the audio data format, the minimum pixel clock frequency and resolution that can be transmitted are appropriately selected for each format of the content data to be transmitted, and the content transmitting apparatus Data can be transmitted.

  Preferably, the apparatus further comprises setting means for setting whether or not automatic resolution setting is permitted in association with device information of the content transmission apparatus according to a user operation, and when the automatic resolution setting is permitted, A transmission control unit causes the content transmission apparatus to transmit the content data at a resolution corresponding to the lowest pixel clock frequency at which the content data can be transmitted.

  In this case, when the sound quality priority mode is set, the resolution of the content data can be automatically changed only when the user desires.

  Preferably, the transmission control unit causes the content transmission device to transmit the content data at a resolution corresponding to the lowest pixel clock frequency at which the content data can be transmitted. When it is determined that the resolution has been changed, the setting unit notifies the user whether to automatically disallow resolution automatic setting or whether to disallow automatic resolution setting.

  If the content transmission device does not appropriately support such a resolution changing function, there is a problem in that the format of the audio data changes if the transmission control means causes the content reproduction device to transmit the content at the lowest pixel clock frequency. Arise. Therefore, by setting the automatic resolution setting to not permitted in such a case, it is possible to prevent the audio format of the audio data from changing even if the sound quality priority mode is set in the future.

  Preferably, the content transmission device can switch between content data including video data of only upper m bits and content data including video data of upper m bits and lower n bits, When the sound quality priority mode is set by the audio mode setting unit, the transmission control unit causes the content transmission apparatus to transmit content data including video data of only upper m bits.

  By not including the lower n bits of video data in the content data, the pixel clock frequency of the video data can be lowered.

  Preferably, when the content transmission device and the content reception device are compliant with the HDMI standard or the DVI standard, and the sound quality priority mode is set by the audio mode setting unit, the transmission control unit includes the content transmission device. To decrease the TMDS clock frequency.

  By reducing the TMDS clock frequency of the content data, the pixel clock frequency of the video data can be lowered.

  A content receiving apparatus according to another preferred embodiment of the present invention is connectable to a content transmitting apparatus that transmits content data including video data and audio data, and includes a receiving means for receiving the content data and a sound quality priority mode. Audio mode setting means for setting one audio mode from a plurality of audio modes according to user operations, and audio corresponding to the audio mode set by the audio mode setting means for the audio data included in the content data When the sound quality priority mode is set by the sound processing means for executing the processing, the setting value storage unit that stores the setting value related to the pixel clock frequency acquired by the content transmitting device, and the sound mode setting means. The lowest pixel clock frequency at which the content data can be transmitted The setting value associated with and a registration means for registering the setting value storage unit.

  When the sound quality priority mode is set, deterioration of sound quality of audio data can be suppressed by setting the pixel clock frequency to the lowest value.

  Hereinafter, a DVD player (content reproduction device), an AV amplifier (audio processing device), and a display device according to preferred embodiments of the present invention will be specifically described with reference to the drawings. The present invention is not limited to these embodiments. It is not limited.

  FIG. 1 is a schematic block diagram showing the configurations of the DVD player 10 and the AV amplifier 20, and FIG. 2 is a schematic block diagram showing the configurations of the AV amplifier 20 (same as FIG. 1) and the display device 30, respectively. The DVD player 10, the AV amplifier 20, and the display device 30 conform to the HDMI (or DVI, the same applies hereinafter) standard, and are connected to each other via an HDMI cable. In this example, content data is a general term for video data (including the meaning of image data, the same applies hereinafter) and audio data.

[Configuration of DVD Player 10]
The DVD player 10 includes a reproduction unit 11, a resolution conversion unit 12, an HDMI transmission unit 13, a system control unit 14, an operation display unit 15, a memory 16, and a connector unit 17.

  The playback unit 11 reads out video data recorded on a DVD disc, SACD disc, CD disc or the like (hereinafter simply referred to as a disc) from the disc, decodes it, and supplies it to the resolution conversion unit 12. Also, the playback unit 11 reads out audio data recorded on the disc from the disc, decodes it, and supplies it to the HDMI transmission unit 13. The reproduction unit 11 includes an optical pickup, a servo circuit, an MPEG decoder, an audio decoder, etc. (not shown).

  The resolution conversion unit 12 determines the resolution of the video data supplied from the reproduction unit 11. Further, the resolution conversion unit 12 converts the determined resolution of the video data into a resolution set by a user operation by a command from the system control unit 14. The video data whose resolution has been converted by the resolution conversion unit 12 is supplied to the HDMI transmission unit 13. Note that the pixel clock frequency of the video data is changed by changing the resolution, and in general, the pixel clock frequency becomes lower when the resolution is lower.

  The HDMI transmission unit 13 converts the video data supplied from the resolution conversion unit 12 and the audio data supplied from the reproduction unit 11 to HDMI standard data (hereinafter simply referred to as HDMI data) by a command from the system control unit 14. Convert to The HDMI transmission unit 13 transmits the converted HDMI data to the AV amplifier 20 via the connector unit 17.

  The HDMI transmission unit 13 determines TMDS lines for transmitting and receiving HDMI data (normally, there are a plurality of lines, but only one line is shown in FIGS. 1 and 2 for simplicity), and whether or not there is a connection. Is connected to the HDMI receiving unit 21 of the AV receiver 20 through the hot plug line.

  The system control unit 14 controls the reproduction unit 11, the resolution conversion unit 12, the HDMI transmission unit 13, the operation display unit 15, the memory 16, and the like, and is, for example, a microcomputer or a CPU. The system control unit 14 executes various processes based on an operation input from the operation display unit 15 or a control signal and data from each unit.

  The system control unit 14 is connected to the system control unit 23 of the AV amplifier 20 via the CEC line, and transmits / receives commands and / or data to / from the system control unit 23. Further, the system control unit 14 is connected to the PROM 25 of the AV amplifier 20 via the DDC line, acquires the EDID stored in the PROM 25, and reads resolution information and the like from the EDID.

  The system control unit 14 causes the operation display unit 15 to display a setup menu for performing various initial settings. The setup menu includes a resolution setting screen for setting the resolution of video data to be output by a user operation. When the resolution is set (setting the resolution means storing the resolution in the memory), the system control unit 14 converts the video data to the set resolution with respect to the resolution conversion unit 12. Instruct.

  The memory 16 stores in advance the types of resolution that the DVD player 10 can output to the AV amplifier 20. The system control unit 14 reads out the resolution type stored in the PROM 25 of the AV amplifier 20 via the DDC line and collates it with the resolution type stored in the memory 16 in advance. The system control unit 14 displays on the resolution selection screen a resolution type that matches the resolution type included in the EDID read from the PROM 25 of the AV amplifier 20 from among the resolution types stored in the memory 16 in advance. To do.

  When the EDID stored in the PROM 25 is changed because the audio mode is set to the sound quality priority mode in the AV amplifier 20, the system control unit 14 reads the resolution included in the EDID, and the resolution conversion unit 12 is instructed to convert the video data to the read resolution. At this time, the system control unit 14 temporarily stores in the memory 16 the resolution selected from the resolution setting screen by the user operation.

  When the EDID stored in the PROM 25 is changed because the audio mode is changed from the sound quality priority mode to another mode in the AV amplifier 20, the system control unit 14 stores the user operation stored in the memory 16. The resolution selected by the above is read out, and the resolution conversion unit 12 is instructed to convert the video data to the read resolution.

[Configuration of AV Amplifier 20]
The AV amplifier 20 includes an HDMI receiving unit 21, an HDMI transmitting unit 22, a system control unit 23, an operation display unit 24, a memory (EDID PROM, hereinafter referred to as PROM) 25, an audio processing unit 26, and a connector unit 27A. 27B, a video input terminal 27C, a video processing unit 28, and a power supply circuit 29.

  The HDMI receiving unit 21 receives the HDMI data transmitted from the DVD player 10, generates original video data (video data before HDMI conversion) from the received HDMI data, and supplies it to the HDMI transmitting unit 22. Further, the HDMI receiving unit 21 generates original audio data from the received HDMI data and supplies the generated audio data to the audio processing unit 26.

  The video processing unit 28 performs predetermined processing (for example, analog-digital conversion processing, resolution conversion processing, etc.) on the analog video signal input from the video input terminal 27 </ b> C and supplies it to the HDMI transmission unit 22. The video processing unit 28 operates when a power supply voltage is supplied from the power supply circuit 29. When a sound quality priority mode to be described later is selected, the supply of the power supply voltage is turned off by the system control unit 23, and the operation is stopped. To do.

  The HDMI transmitting unit 22 converts the video data supplied from the HDMI receiving unit 21, the audio data supplied from the audio processing unit 26 as necessary, and the video data supplied from the video processing unit 28 into HDMI data. And it transmits to the display apparatus 30 via the connector part 27B. The HDMI transmission unit 22 is connected to the HDMI reception unit 31 of the display device 30 via a TMDS line and a hot plug.

  The audio processing unit 26 performs audio processing such as signal processing, delay processing, equalizer processing, volume adjustment processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 21, An audio signal is supplied to the speaker 60 connected to the outside. Further, the audio processing unit 26 supplies audio data to the HDMI transmission unit 22 as necessary.

  The AV amplifier 20 is provided with a plurality of audio modes (listening modes), and one audio mode can be selected by a user operation. The voice processing unit 26 performs voice processing that is set in advance for the selected voice mode on the voice data.

  As one of the sound modes, a sound quality priority mode (also referred to as a pure audio mode) is provided. In the sound quality priority mode, the processing of the video processing unit 28 is stopped by turning off the power supply voltage supplied to the video processing unit 28. As a result, it is possible to prevent deterioration in sound quality of audio data (for example, deterioration in S / N ratio) due to the processing of the video processing unit 28.

  The system control unit 23 controls the HDMI reception unit 21, the HDMI transmission unit 22, the operation display unit 24, the PROM 25, the audio processing unit 26, the video processing unit 28, the power supply circuit 29, and the like. Etc. The system control unit 23 executes various processes based on an operation input from the operation display unit 24 or a control signal and data from each unit.

  When the voice mode is selected by a user operation, the system control unit 23 sets the selected voice mode (setting the voice mode means storing the voice mode in the memory 23a), and the set voice. The voice processing unit 26 is instructed to perform voice processing on the voice data based on the mode. Further, the system control unit 23 stops the supply of the power supply voltage to the video processing unit 28 and stops the operation of the video processing unit 28 when the audio mode / sound quality priority mode is set. The processing unit 28 is controlled.

  The system control unit 23 is connected to the system control unit 14 of the DVD player 10 via the CEC line, and transmits and receives commands and data to and from the system control unit 14. The system control unit 23 is connected to the system control unit 33 of the display device 30 via the CEC line, and transmits and receives commands and data to and from the system control unit 33. Further, the system control unit 23 is connected to the PROM 34 of the display device 30 via the DDC line, and reads the EDID including the resolution type that can be displayed on the display device 30 from the PROM 34.

  The system control unit 23 has a built-in (or connected) memory 23a, and the type of resolution output by the AV amplifier 20 is stored in the memory 23a in advance (this type of resolution is not the ROM 23a). Or may be stored in the PROM 25). Normally, the ROM 23a stores a plurality of resolution types corresponding to the HDMI standard.

  The PROM 25 is connected to the system control unit 14 of the DVD player 10 via a DDC line. In the PROM 25, the EDID including the type of resolution is registered by the system control unit 23, and the registered EDID is read by the system control unit 14 of the DVD player 10 via the DDC line.

  When the sound mode other than the sound quality priority mode is set, the system control unit 23 matches the resolution type included in the EDID read from the PROM 34 of the display device 30 among the resolution types stored in advance in the ROM 23a. The type of resolution to be registered is registered in the PROM 25. That is, the type of resolution that the AV amplifier 20 and the display device 30 store in common is registered in the PROM 25. However, the present invention is not limited to this, and the system control unit 23 may register all the resolution types read from the PROM 34 of the display device 30 in the PROM 25 ignoring the resolution types stored in the ROM 23a. That is, regardless of the resolution type stored in the AV amplifier 20, the resolution type stored in the display device 30 may be registered in the PROM 25.

  When the sound quality priority mode is set as the sound mode, the system control unit 23 determines the format of the sound data currently received from the DVD player 10, and sets the lowest pixel clock frequency at which HDMI data can be transmitted in that format. The resolution corresponding to the pixel clock frequency is registered in the PROM 25. That is, the system control unit 23 causes the DVD player 10 to transmit the HDMI data at the lowest pixel clock frequency that can be transmitted in the current audio data format. By minimizing the pixel clock frequency of the HDMI data, the sound quality of the audio data included in the HDMI data can be improved. This is because in HDMI data, the sound quality of audio data can be improved as the pixel clock frequency of video data is smaller.

  Specifically, the pixel clock table shown in FIG. 3 is stored in the memory 23a. The pixel clock table is information indicating whether or not each pixel clock frequency (resolution corresponding to the pixel clock frequency in parentheses) of the video data can be obtained in association with the format of the audio data (and the sampling frequency as necessary). Is registered in advance. “◯” indicates that it can be taken, and “×” indicates that it cannot be taken. The system control unit 23 determines the lowest possible pixel clock frequency and the corresponding resolution by referring to the format and sampling frequency of the audio data included in the currently received HDMI data and the pixel clock table. .

  For example, if the audio data is PCM 8ch (48 kHz), the resolution 640 × 480p (VGA) corresponding to the pixel clock frequency 25.2 MHz is registered in the PROM 25, and the HDMI data including the video data of the resolution is transmitted to the DVD player 10. Let If the PCM is 8ch (88.2 kHz), a resolution of 720 × 480p corresponding to a pixel clock frequency of 27 MHz is registered in the PROM 25, and the DVD player 10 transmits HDMI data including video data of the resolution.

  Further, the system control unit 23 sets whether or not to permit the above automatic setting of the resolution when the sound quality priority mode is set for each connected DVD player 10 based on a user operation. Specifically, the resolution setting table shown in FIG. 4 is stored in the memory 23a. In the resolution setting table, information indicating whether or not automatic resolution setting is permitted is registered in association with device information of the connected DVD player 10 based on a user operation. That is, “◯” indicates that automatic resolution setting is permitted, and “×” indicates that automatic setting is not possible. When the mode is changed to the sound quality priority mode, the system control unit 23 determines whether automatic resolution setting is permitted for the device information of the currently connected DVD player 10 and only when the resolution is permitted. Thus, the resolution corresponding to the lowest pixel clock frequency is registered in the PROM 25.

[Configuration of display device]
The display device 30 includes an HDMI receiving unit 31, a display unit 32, a system control unit 33, a memory (EDID PROM, hereinafter referred to as PROM) 34, an operation unit 35, an audio processing unit 36, a speaker 37, and a connector. Part 38.

  The HDMI receiving unit 31 receives the HDMI data transmitted from the HDMI transmitting unit 22 of the AV amplifier 20, generates original video data from the received HDMI data, and supplies the original video data to the display unit 32. In addition, the HDMI receiving unit 31 generates original audio data from the HDMI data and supplies it to the audio processing unit 36.

  The display unit 32 is supplied with video data from the HDMI receiving unit 31 and displays video based on the video data, and is, for example, an LCD or a PDP.

  The audio processing unit 36 performs processing such as signal processing, amplification processing, and D / A conversion on the audio data supplied from the HDMI receiving unit 31 and supplies the processed audio data to the speaker 37.

  The system control unit 33 controls the HDMI receiving unit 31, the display unit 32, the PROM 34, the audio processing unit 36, and the like, and is, for example, a microcomputer or a CPU. The system control unit 33 executes various processes based on an operation input from the operation unit 35 or a control signal and data from each unit.

  In the PROM 34, an EDID including a resolution type that can be displayed on the display unit 32 is stored in advance. The EDID is read by the system control unit 23 of the AV amplifier 23 via the DDC line.

[Operation]
FIG. 5 is a flowchart showing processing of the system control unit 23 when a voice mode setting instruction is input by a user operation. When the voice mode setting instruction is input by the user operation, the system control unit 23 determines whether the instruction is a setting instruction for the sound quality priority mode (S1). If the instruction is to set the sound quality priority mode (YES in S1), the system control unit 23 determines whether automatic resolution setting is permitted based on the device information of the currently connected DVD player 10. 4 is determined with reference to the resolution setting table 4 (S2). The system control unit 23 obtains device information from the DVD player 10 when connected to the DVD player 10 and stores the device information in the memory.

  If automatic resolution setting is not permitted (NO in S2), the process proceeds to S9. On the other hand, when the automatic resolution setting is permitted (YES in S2), the system control unit 23 determines the format and sampling frequency of the audio data included in the HDMI data currently received from the DVD player 10 ( S3). That is, the audio processing unit 26 decodes the audio data received from the HDMI receiving unit 21, thereby reading out the format information and sampling frequency information included in the header of the audio data and supplying the same to the system control unit 23. The system control unit 23 determines the format and sampling frequency of the audio data based on the supplied format information and sampling frequency information.

  Subsequently, the system control unit 23 reads the lowest pixel clock frequency from the pixel clock table of FIG. 3 among the pixel clock frequencies that can transmit HDMI data for the determined format and sampling frequency (S4). For example, in the case of PCM8ch (48 kHz), 25.2 MHz is read as the pixel clock frequency, and in the case of PCM8ch (88.2 kHz), 27 MHz is read as the pixel clock frequency.

  Subsequently, the system control unit 23 inverts the hot plug signal output to the DVD player 10 from the high level to the low level (S5). This causes the DVD player 10 to recognize that the AV amplifier 20 is not connected to the DVD player 10 or that the AV amplifier 20 is not active.

  Subsequently, the system control unit 23 extracts the resolution corresponding to the extracted pixel clock frequency, and registers the EDID including the extracted resolution information in the PROM 25 (S6). For example, the system control unit 23 registers the resolution 640 × 480p in the PROM 25 when the pixel clock frequency is 25.2 MHz, and registers the resolution 720 × 480p in the PROM 25 when the pixel clock frequency is 27 MHz. To do.

  Subsequently, the system control unit 23 inverts the hot plug signal output to the DVD player 10 from the low level to the high level (S7). Thereby, the DVD player 10 is made to recognize that the AV amplifier 20 is connected to the DVD player 10, and the DVD player 10 is made to acquire the EDID.

  As shown in FIG. 6, when the hot plug signal from the AV amplifier 20 is inverted from the low level to the high level (YES in S21), the system control unit 14 of the DVD player 10 acquires the EDID from the PROM 25 of the AV amplifier 20. Then, the resolution information included in the EDID is read (S22). Here, the system control unit 14 determines whether only one resolution information is included in the EDID (S23). As described above, when the sound mode is changed to the sound quality priority mode, when the resolution information is registered in the PROM 25, one resolution information corresponding to the lowest pixel clock frequency is registered.

  Here, since the EDID includes only one resolution corresponding to the lowest pixel clock frequency (YES in S23), the system control unit 14 sets the resolution read from the EDID, and sets the video data to the set resolution. The resolution conversion unit 12 is instructed to convert (S24). For example, if the read resolution is 640 × 480p, the system control unit 23 instructs the resolution conversion unit 12 to convert the video data to 640 × 480p.

  As a result, the DVD player 10 allows the video data to have a resolution corresponding to the lowest pixel clock frequency among the pixel clock frequencies at which HDMI data can be transmitted with respect to the format (and sampling frequency) of the audio data currently being reproduced. And the HDMI data including the video data and the audio data is transmitted to the AV amplifier 20. Therefore, since the pixel clock frequency of the HDMI data can be minimized, it is possible to minimize deterioration in sound quality due to the influence of the pixel clock of the audio data included in the HDMI data.

  Finally, the system control unit 14 stores the resolution information selected and set by the user operation in the memory (S25).

  Returning to FIG. 5, the system control unit 23 of the AV amplifier 20 determines whether the format (and / or sampling frequency) of the audio data included in the HDMI data received from the DVD player 10 has changed as a result of changing the resolution. Is determined (S8). If the format (and / or sampling frequency) of the audio data has not been changed (NO in S8), the process proceeds to S9, and the system control unit 23 turns off the power supply voltage supplied to the video processing unit 28. The operation of the video processing unit 28 is stopped (S9).

  Here, in the DVD player 10, when it is detected that the hot plug signal is at a high level, the EDID is acquired and the resolution setting is changed, the format (and sampling frequency) of the audio data transmitted to the AV amplifier 20 is changed. There are models that change (initialize). For such a DVD player 10, it is not preferable to reacquire the EDID and automatically change the resolution setting in response to the audio mode change of the AV amplifier 20.

  Therefore, when the system control unit 23 determines that the format (and / or sampling frequency) of the audio data has been changed (YES in S8), the DVD player 10 is appropriately adapted to the automatic resolution setting that responds to the change of the audio mode. A notification to the effect that it does not correspond is displayed on the operation display unit 24 (S10), and then the process proceeds to S9.

  For example, as shown in FIG. 7A, a notice that the automatic resolution setting in response to the audio mode change is not appropriately handled is displayed, and the automatic resolution setting of the DVD player in the resolution setting table is not permitted. Whether or not to change to is selected by a user operation. When “YES” is selected by the user operation, the system control unit 23 changes the automatic resolution setting of the DVD player in the resolution setting table to “NO”. As a result, when the audio mode of the AV amplifier 20 is changed to the sound quality priority mode, it is determined NO in S2 of FIG. 5, so that the resolution is not automatically changed. 7A may be displayed, and the system control unit 23 may automatically change the automatic resolution setting of the DVD player in the resolution setting table to “No”.

  Further, as shown in FIG. 7B, since the audio format is changed along with the resolution change, the user may be notified that the audio mode is restored.

  Next, as shown in FIG. 5, when the sound mode is changed from the sound quality priority mode to another sound mode (NO in S <b> 1, YES in S <b> 11), the system control unit 23 causes the DVD player 10 to The hot plug signal to be output is inverted from the high level to the low level (S12). Then, the system control unit 23 extracts a plurality of resolutions common to the resolution that can be processed by the display device and the resolution that can be processed by the AV amplifier, and registers the EDID including the plurality of resolutions in the PROM 25 (S13). . Alternatively, EDID including all resolutions that can be processed by the display device is registered in the PROM 25.

  Subsequently, the system control unit 23 inverts the hot plug signal output to the DVD player 10 from the low level to the high level (S14). Thereafter, the system control unit 23 controls the power supply voltage supplied to the video processing unit 28 to be in an on state, and sets the video processing unit 28 in an operating state (S15).

  As shown in FIG. 6, when the system control unit 14 of the DVD player 10 detects that the hot plug signal is inverted from the low level to the high level (YES in S21), the system control unit 14 acquires the EDID from the PROM 25 of the AV amplifier 20. The resolution information is read (S22). Since the EDID includes a plurality of pieces of resolution information (NO in S23), the system control unit 23 determines whether or not the resolution selected by the user operation by the process of S25 is stored in the memory ( S26).

  When the resolution selected by the user operation is stored in the memory (YES in S26), the system control unit 23 sets the resolution selected by the user operation again and converts the video data to the resolution. The resolution setting unit 12 is instructed to do so (S27). Therefore, even when the resolution is automatically changed by the DVD player 10 by setting the video mode to the sound quality priority mode, the video mode is changed again from the sound quality priority mode to another audio mode. , It can automatically return to the originally set resolution.

  On the other hand, when the resolution selected by the user operation is not stored in the memory (NO in S26), since the recommended resolution is included in the EDID, the system control unit 14 sets the recommended resolution. Then, the resolution setting unit 12 is instructed to convert the video data to the resolution (S28).

  Next, as shown in FIG. 5, when the voice mode is changed from a voice mode other than the sound quality priority mode to a voice mode other than the sound quality priority mode (NO in S1, NO in S11), system control The unit 23 changes the voice mode (S16) and ends the process.

  As described above, according to this embodiment, when the audio mode is changed to the sound quality priority mode, the resolution set in the DVD player 10 corresponds to the lowest possible pixel clock frequency for the audio data format. Therefore, it is possible to suppress deterioration in sound quality caused by the pixel clock.

[Second Embodiment]
In the HDMI standard 1.3, in addition to the conventional m bits (upper m bits) of RGB colors, n bits (lower n bits) of Deep Color are added, so that each RGB color has a maximum m + n bits, that is, the total of 3 colors is 3 ×. Video data can be transmitted and received with (m + n) bits. In the HDMI standard 1.3, typically, m = 8 and n is 2, 4, or 8. The EDID registered in the PROM 25 includes a Deep Color flag.
When the Color flag is on, the DVD player 10 is deep.
When the Deep Color flag is off, the DVD player 10 outputs m bits of HDMI data of each color not including n bits of Deep Color, when m + n bits of HDMI data including n bits of Color are output.

  The system control unit 23 of the AV amplifier 20 changes the EDID so as to turn off the Deep Color flag when the sound mode is set to the sound quality priority mode. As a result, the DVD player 10 outputs m-bit HDMI data of each color not including n bits of Deep Color. By not including n bits of Deep Color in the HDMI data, the pixel clock frequency of the HDMI data can be lowered, so that deterioration in sound quality caused by the high pixel clock frequency can be suppressed.

  The operation of this example will be described with reference to the flowcharts of FIGS. As shown in FIG. 8, when the audio mode is changed to the sound quality priority mode (YES in S31), the system control unit 23 of the AV amplifier 20 changes the hot plug signal output to the DVD player 10 from a high level to a low level. Invert (S32). The system control unit 23 changes the EDID so as to turn off the Deep Color flag (S33), and inverts the hot plug signal output to the DVD player 10 from the low level to the high level (S34). Then, the system control unit 23 controls the power supply voltage supplied to the video processing unit 28 to be turned off, and stops the operation of the video processing unit 28 (S35).

  As shown in FIG. 9, when the system control unit 14 of the DVD player 10 detects that the hot plug signal is inverted from the low level to the high level (YES in S51), the system control unit 14 obtains the EDID from the PROM 25 and obtains the Deep Color flag. Is read (S52). Then, the system control unit 14 determines whether or not the Deep Color flag is on (S53). Here, since the Deep Color flag is off (NO in S53), the system control unit 23 disables Deep Color and the DVD player 10 outputs HDMI data of m bits for each color not including n bits of Deep Color. To do. As a result, although the video data of the HDMI data cannot be made high quality, the sound quality deterioration of the audio data can be suppressed.

  As shown in FIG. 8, when the sound mode is changed from the sound quality priority mode to another sound mode (NO in S31, YES in S36), the system control unit 23 outputs hot data to the DVD player 10. The plug signal is inverted from the high level to the low level (S37). The system control unit 23 changes the EDID so as to turn on the Deep Color flag (S38), and inverts the hot plug signal output to the DVD player 10 from the high level to the low level (S39). Then, the system control unit 23 controls the power supply voltage supplied to the video processing unit 28 to be turned on, and operates the video processing unit 28 (S40).

  As shown in FIG. 9, when the system control unit 23 of the DVD player 10 detects that the hot plug signal is inverted from the low level to the high level (YES in S51), it acquires the EDID from the PROM 25 and obtains the Deep Color flag. Is read (S52). Then, the system control unit 14 determines whether or not the Deep Color flag is on (S53). Here, since the Deep Color flag is on (YES in S53), the system control unit 23 sets the Deep Color to be valid, and the DVD player 10 outputs m + n bits of HDMI data of each color including n bits of Deep Color. .

[Third Embodiment]
The system control unit 23 of the AV amplifier 20 changes the EDID so that the TMDS clock frequency is minimized when the sound mode is set to the sound quality priority mode. As a result, the DVD player 10 sets the TMDS clock frequency to the minimum and outputs HDMI data. As a result, by lowering the TMDS clock frequency, the pixel clock frequency of the HDMI data can be lowered, so that deterioration in sound quality of audio data due to the high pixel clock frequency can be suppressed.

  The operation of this example will be described with reference to the flowcharts of FIGS. As shown in FIG. 10, when the audio mode is changed to the sound quality priority mode (YES in S61), the system control unit 23 of the AV amplifier 20 changes the hot plug signal output to the DVD player 10 from the high level to the low level. Invert (S62). The system control unit 23 changes the EDID so as to set the maximum TMDS clock frequency to the minimum value (S63), and inverts the hot plug signal output to the DVD player 10 from the low level to the high level (S64). Then, the system control unit 23 controls the power supply voltage supplied to the video processing unit 28 to be turned off, and stops the operation of the video processing unit 28 (S65).

  As shown in FIG. 11, when the system control unit 23 of the DVD player 10 detects that the hot plug signal is inverted from the low level to the high level (YES in S81), it acquires the EDID from the PROM 25 and obtains the maximum TMDS clock. The frequency is read (S82). Then, the system control unit 14 sets the read maximum TMDS clock frequency, and the DVD player 10 outputs HDMI data having the read maximum TMDS clock frequency. As a result, although the video data of the HDMI data cannot be made high quality, the sound quality deterioration of the audio data can be suppressed.

  As shown in FIG. 10, when the sound mode is changed from the sound quality priority mode to another sound mode (NO in S61, YES in S66), the system control unit 23 outputs hot data to the DVD player 10. The plug signal is inverted from the high level to the low level (S67). The system control unit 23 changes the maximum TMDS clock frequency to the original value (S68), and inverts the hot plug signal output to the DVD player 10 from the high level to the low level (S69). Then, the system control unit 23 controls the power supply voltage supplied to the video processing unit 28 to be turned on, and causes the video processing unit 28 to operate (S70).

  As shown in FIG. 11, when the system control unit 23 of the DVD player 10 detects that the hot plug signal is inverted from the low level to the high level (YES in S81), it acquires the EDID from the PROM 25 and obtains the maximum TMDS clock. The frequency is read (S82). Then, the system control unit 14 sets the read maximum TMDS clock frequency, and the DVD player 10 outputs HDMI data having the read maximum TMDS clock frequency.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. As long as the pixel clock frequency of the HDMI data transmitted by the DVD player is lowered, the AV amplifier may change any setting value other than the above embodiments. Further, an audio mode including a sound quality priority mode is provided in the display device instead of the AV amplifier, and the pixel clock frequency of the HDMI data transmitted by the DVD player when the sound quality priority mode is set may be controlled to the minimum value. . Further, the program may be provided in the form of a program for causing a computer to execute the above operations of the DVD player, AV amplifier, and display device, and a recording medium on which the program is recorded.

  The present invention can be suitably employed in DVD players, AV amplifiers, display devices, and the like.

1 is a block diagram showing a configuration of a DVD player 10 and an AV amplifier 20 according to a preferred embodiment of the present invention. 1 is a block diagram showing a configuration of an AV amplifier 20 and a display device according to a preferred embodiment of the present invention. It is a figure which shows a pixel clock table. It is a figure which shows the resolution setting table. 5 is a flowchart for explaining the operation of the AV amplifier 20. 4 is a flowchart for explaining the operation of the DVD player 10. It is a figure which shows the notification to the effect corresponding to the resolution automatic setting. It is a flowchart explaining operation | movement of AV amplifier 20 of 2nd Embodiment. It is a flowchart explaining operation | movement of the DVD player 10 of 2nd Embodiment. It is a flowchart explaining operation | movement of AV amplifier 20 of 3rd Embodiment. It is a flowchart explaining operation | movement of the DVD player 10 of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 DVD player 20 AV amplifier 21 HDMI receiving part 22 HDMI transmission part 23 System control part 23a ROM
25 PROM
26 Audio processing unit 28 Video processing unit 30 Display device

Claims (9)

It can be connected to a content transmission device that transmits content data including video data and audio data,
Receiving means for receiving the content data;
A voice mode setting means for setting one voice mode in response to a user operation from a plurality of voice modes including a sound quality priority mode;
Sound processing means for executing sound processing corresponding to the sound mode set by the sound mode setting means on the sound data included in the content data;
A content receiving device comprising: a transmission control unit that causes the content transmitting device to transmit the content data at a lowest pixel clock frequency capable of transmitting the content data when a sound quality priority mode is set by the audio mode setting unit. .   When the sound quality priority mode is set by the audio mode setting unit, the transmission control unit transmits the content data to the content transmission device at a resolution corresponding to the lowest pixel clock frequency at which the content data can be transmitted. The content receiving device according to claim 1, wherein: A storage unit in which a pixel clock frequency capable of transmitting the content data is registered in advance in association with each format of audio data included in the content data;
Format discriminating means for discriminating the format of audio data included in the content data received by the receiving means;
The transmission control unit reads the lowest pixel clock frequency among the pixel clock frequencies corresponding to the format determined by the format determination unit from the storage unit, and transmits the content at a resolution corresponding to the lowest pixel clock frequency. The content receiving device according to claim 2, wherein the content data is transmitted by a device. A setting unit configured to set whether or not automatic resolution setting is permitted in association with the device information of the content transmission device according to a user operation;
The transmission control unit causes the content transmission apparatus to transmit the content data at a resolution corresponding to a lowest pixel clock frequency at which the content data can be transmitted when the automatic resolution setting is permitted. 4. The content receiving device according to 3.   As a result of the transmission control unit causing the content transmission device to transmit the content data at a resolution corresponding to the lowest pixel clock frequency capable of transmitting the content data, the format determination unit changes the format of the audio data. 5. The content receiving apparatus according to claim 4, wherein if it is determined, the setting unit notifies the user whether to automatically disallow resolution automatic setting or to disallow automatic resolution setting. 6. . The content transmission device can switch between content data including video data of only upper m bits and content data including video data of upper m bits and lower n bits,
The content reception according to claim 1, wherein when the sound quality priority mode is set by the audio mode setting unit, the transmission control unit causes the content transmission apparatus to transmit content data including video data of only upper m bits. apparatus. The content transmitting device and the content receiving device are compliant with the HDMI standard or the DVI standard,
The content receiving apparatus according to claim 1, wherein when the sound quality priority mode is set by the audio mode setting means, the transmission control means lowers the TMDS clock frequency of the content transmitting apparatus. It can be connected to a content transmission device that transmits content data including video data and audio data,
Receiving means for receiving the content data;
A voice mode setting means for setting one voice mode in response to a user operation from a plurality of voice modes including a sound quality priority mode;
Sound processing means for executing sound processing corresponding to the sound mode set by the sound mode setting means on the sound data included in the content data;
A set value storage unit that stores a set value related to a pixel clock frequency obtained by the content transmission device;
Content reception comprising: registration means for registering a setting value related to the lowest pixel clock frequency capable of transmitting the content data in the setting value storage unit when a sound quality priority mode is set by the audio mode setting means apparatus.   An operation program for a content receiving apparatus that causes a computer to execute each unit of the content receiving apparatus according to claim 1.

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