JP2010061774A - Reproduction device, reproduction control method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an HDMI (High-Definition Multimedia Interface) signal capable of outputting in high sound quality. <P>SOLUTION: In a reproduction device 1 having an HDMI terminal 17, a controller 22 detects whether connection form of the HDMI terminal has a connection form targeted only for hearing sounds. When it is detected that the connection form of the HDMI terminal is the connection form targeted only for hearing sounds, an OSD (On Screen Display) processing part 15 or an HDMI I/F16 alters a video signal included in an HDMI signal or a control signal based on the video signal and altered video signal or the altered control signal based on the video signal is outputted together with an audio signal as the HDMI signal from the HDMI terminal 17. This invention can be applied to e.g. a reproduction device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a playback device, a playback control method, and a program, and more particularly, to a playback device, a playback control method, and a program that can provide an HDMI signal that can be output with high sound quality.

  HDMI (High-Definition Multimedia Interface) is an interface standard designed mainly for digital video and audio input / output for home appliances and AV equipment. According to HDMI-compliant signals (HDMI signals), It is possible to transmit and receive a video signal, an audio signal, and a control signal (control information) via a cable (see, for example, Patent Document 1).

  As a form adopting HDMI, there is a form in which a recording / reproducing apparatus for recording or reproducing AV data on a recording medium such as an optical disk or a hard disk and a display apparatus such as a television receiver are connected by an HDMI cable.

  In addition, in recent years, home theater systems that include an AV amplifier and multi-channel speakers such as 5.1 channel in addition to recording / playback devices and display devices are becoming widespread. In addition to the case, a viewing mode in which only sound (music) is listened to is also assumed.

JP 2008-158595 A

  By the way, HDMI is a mechanism for transmitting an audio signal through a gap for transmitting a video signal. The audio signal is a video signal clock (Video Pixel Clock), more specifically, a TMDS generated from a clock of a video signal. It is transmitted using a clock. Since the audio master clock is generated from the TMDS clock on the receiving side (receiver), the sound quality reproduced on the receiving side is easily affected by the accuracy of the clock of the video signal, for example, the jitter of the TMDS clock. .

  In recent years, in the transmission of video signals in HDMI, the image frame size, the frame rate, and the bit width have been increased to increase the image quality and the screen size, and the frequency of the TMDS clock has been increased. When the TMDS clock becomes high frequency, TMDS clock jitter tends to occur. When jitter occurs in the TMDS clock, jitter also occurs in the audio master clock generated from the TMDS clock, so that the reproduced sound quality is likely to deteriorate.

  As described above, the sound quality of the audio signal supplied as the HDMI signal may be affected by the video signal and deteriorated.

  The present invention has been made in view of such circumstances, and is intended to provide an HDMI signal that can be output with high sound quality.

  A playback device according to one aspect of the present invention is a playback means for reading a video signal and an audio signal recorded on a predetermined recording medium, an HDMI terminal for outputting a signal corresponding to the video signal and the audio signal by an HDMI signal, Detection means for detecting whether the connection form of the device connected via the HDMI terminal is a form only for listening to sound, and a form for the connection form only for listening to sound And a signal control means for changing the video signal or a control signal based on the video signal when the signal is detected, and the output terminal receives the control signal based on the changed video signal or the video signal. The HDMI signal is output together with the audio signal.

  A playback control method according to one aspect of the present invention is a playback device including an HDMI terminal that reads a video signal and an audio signal recorded on a predetermined recording medium and outputs a signal corresponding to the video signal and the audio signal as an HDMI signal. However, it is detected whether the connection form of the device connected via the HDMI terminal is a form only for listening to sound, and the connection form is for a purpose only for listening to sound. If detected, the video signal or the control signal based on the video signal is changed, and the changed video signal or the control signal based on the video signal is output by the HDMI signal together with the audio signal. .

  A program according to one aspect of the present invention is a connection form of an apparatus connected to a computer via an HDMI terminal that controls reading of a video signal and an audio signal recorded on a predetermined recording medium and outputs an HDMI signal. Are detected only for listening to sound, and when the connection form is detected for listening only to the sound, the video signal or the video signal is detected. The control signal based on the change is changed, and the video signal after the change or the control signal based on the video signal is output together with the audio signal by the HDMI signal.

  In one aspect of the present invention, when it is detected that the connection form of a device connected via an HDMI terminal that outputs an HDMI signal is a form only for listening to sound, a video signal or video The control signal based on the signal is changed, and the video signal after the change or the control signal based on the video signal is output by the HDMI signal together with the audio signal.

  According to one aspect of the present invention, an HDMI signal that can be output with high sound quality can be provided.

  FIG. 1 shows a configuration example of an embodiment of a playback apparatus to which the present invention is applied.

  1 includes a drive 11, a buffer 12, a demultiplexer 13, an AV decoder 14, an OSD (On Screen Display) processing unit 15, an HDMI I / F 16, an HDMI terminal 17, an operation input unit 21, and a controller 22. It is configured.

  The drive 11 reads AV stream data that is mounted on the medium 11a or is recorded in the medium 11a, and supplies the read AV stream data to the buffer 12. The medium 11a is, for example, a CD-ROM (Compact Disc-Read Only Memory), a music CD, a DVD (Digital Versatile Disc), a Blu-ray Disc (registered trademark), a hard disk (Hard Disk), or the like.

  The buffer 12 temporarily buffers the AV stream data supplied from the drive 11 and then supplies the AV stream data to the demultiplexer 13.

  The demultiplexer 13 separates the AV stream data supplied from the drive 11 via the buffer 12 into a video stream and an audio stream. The demultiplexer 13 supplies the separated video stream and audio stream to the AV decoder 14.

  The AV decoder 14 decodes the video stream by a predetermined method (for example, MPEG2 (Moving Picture Experts Group 2) method), and supplies the resulting video signal to the OSD processing unit 15. Also, the AV decoder 14 decodes the audio stream by a predetermined method (for example, MPEG2 method), and supplies an audio signal obtained as a result to the HDMI I / F 16.

  The OSD processing unit 15 generates a video signal of a video in which predetermined characters and images are superimposed on the video corresponding to the video signal supplied from the AV decoder 14 and supplies the video signal to the HDMI I / F 16. The OSD processing unit 15 outputs the video signal supplied from the AV decoder 14 as it is (through output), or outputs the video signal of the video (screen) generated by itself instead of the video signal from the AV decoder 14. It is also possible to do. For example, the OSD processing unit 15 can generate and output a video signal of a video or audio setting screen in accordance with an instruction from the controller 22.

  The HDMI I / F 16 converts the audio signal supplied from the AV decoder 14 and the video signal supplied from the OSD processing unit 15 into an HDMI-compliant signal (hereinafter, HDMI signal) and outputs the signal via the HDMI terminal 17. To do. The HDMI I / F 16 is an EDID (Extended Display Identification Data) or CEC (Consumer) acquired from a receiving device (hereinafter referred to as a receiving device) connected via the HDMI terminal 17 and an HDMI cable (not shown). Electronics Control) information (hereinafter collectively referred to as control information) is supplied to the controller 22.

  The operation input unit 21 includes, for example, an input device such as a button, a key, a touch panel, a jog dial, and a mouse, and a receiving unit that receives a signal such as an infrared ray transmitted from a remote commander (not shown). Obtained and supplied to the controller 22.

  The controller 22 controls each unit so as to perform an operation according to a user operation by executing a control program stored in advance. For example, the controller 22 instructs the drive 11 to read AV stream data recorded on the medium 11a, or instructs the OSD processing unit 15 to generate a video signal of a predetermined setting screen.

  Further, the controller 22 recognizes the configuration of the device connected via the HDMI terminal 17 (hereinafter referred to as HDMI connection form) based on the control information supplied from the HDMI I / F 16. Then, the controller 22 sets the HDMI output mode of the playback device 1 to either the normal mode or the high sound quality output mode according to the HDMI connection mode. The normal mode is a mode in which a video signal and an audio signal are output based on a high-quality video signal that is read from the medium 11a. In the high-quality output mode, the audio signal included in the HDMI signal has priority over the video signal. This is the mode to output.

  2 to 4 show examples of the HDMI connection form recognized by the controller 22.

  FIG. 2 shows a first HDMI connection mode, in which the playback device 1 and a television receiver (TV) 31 are connected. In this case, the television receiver 31 outputs video and sound (sound) based on the HDMI signal supplied from the playback device 1.

  FIG. 3 shows a second HDMI connection form, in which an AV amplifier (AMP) 32 is connected between the playback apparatus 1 and the television receiver 31 shown in FIG. In this case, the television receiver 31 outputs (displays) video based on the HDMI signal supplied from the playback device 1, and the AV amplifier 32 outputs sound based on the HDMI signal.

  FIG. 4 shows a third HDMI connection mode, in which only the AV amplifier 32 is connected to the playback device 1 via the HDMI terminal 17. In this case, the AV amplifier 32 outputs only sound based on the HDMI signal. In the third HDMI connection mode, there may be a case where the user is watching only the sound output from the AV amplifier 32, and the AV amplifier is combined with video displayed on another display device by component output or composite output. In some cases, the user may be watching the sound output from 32.

  Based on the control information supplied from the HDMI I / F 16, the controller 22 of the playback device 1 has an HDMI connection mode that is one of the first to third HDMI connection modes described with reference to FIGS. 2 to 4. It detects that it is the 3rd HDMI connection form shown in FIG. 4, ie, the form only for listening to a sound.

  Specifically, the controller 22 detects that the HDMI connection form is a form intended only for listening to sound as follows.

  First, the controller 22 checks the number of devices connected via the HDMI terminal 17 using DEVICE_COUNT and DEPTH, which are HDMI HDCP (High-bandwidth Digital Content Protection) functions. Is detected as 1.

  In the HDMI connection form of FIG. 3, DEVICE_COUNT and DEPTH are both 2, and the number of devices is 2. On the other hand, in the connection modes of FIGS. 2 and 4, both DEVICE_COUNT and DEPTH are 1, and the number of devices is 1. Accordingly, the HDMI connection form in FIG. 3 can be excluded as not being a form intended only for listening to sound. However, the HDMI connection form in FIG. 2 and the HDMI connection form in FIG. 4 cannot be distinguished.

  Therefore, the controller 22 performs processing using one of 1) EDID audio information, 2) EDID product information, and 3) CEC information, so that the HDMI connection form is the HDMI connection form shown in FIG. In other words, it is detected whether the receiving-side device connected via the HDMI terminal 17 is only the AV amplifier 32.

1) Detection using EDID audio information (corresponding audio codec / number of channels information) The audio codec supported by the television receiver 31 is mostly only 2-channel linear PCM. There are rare television receivers 31 that support AC3 (Audio Code number 3) and AAC (Advanced Audio Coding), but even if they can be supported, they are compatible with the AV amplifier 32. There are few types of audio codecs and few channels. For example, the types of audio codecs supported by the AV amplifier 32 include Dolby Digital, Dolby Digital Plus, Dolby TrueHD, DTS, and DTS-HD.

  Therefore, the controller 22 determines whether the receiving device connected via the HDMI terminal 17 is an AV amplifier based on the type or number of channels of the audio codec supported by the receiving device supplied as EDID audio information. It can be detected that only 32. For example, if the receiving side apparatus supports a predetermined type of audio codec that the television receiver 31 does not support, and the number of channels is equal to or more than a predetermined number, the receiving side apparatus is only the AV amplifier 32. To detect.

2) Detection using EDID product information (“Vendor / Product ID”, “Monitor Descriptor Currently Mandatory (Monitor Name)” information)
The EDID includes “Vendor / Product ID”, “Monitor Descriptor Currently Mandatory (Monitor Name)”, and the like as product information that is information about itself (receiving device). Therefore, the controller 22 stores in advance the product information of the receiving side device that is expected to be connected as a database, and detects what matches the acquired product information, thereby being connected via the HDMI terminal 17. It can be detected that the receiving apparatus is only the AV amplifier 32.

3) Detection using CEC information The controller 22 directly detects by CEC that the receiving-side device connected via the HDMI terminal 17 is only the AV amplifier 32. In this case, it is not necessary to use the above-mentioned DEVICE_COUNT and DEPTH.

  As described above, the controller 22 detects based on the EDID information or the CEC information that the HDMI connection form is a form intended only for listening to sound. And the controller 22 sets the HDMI output mode of the reproducing | regenerating apparatus 1 to a high sound quality output mode, when detecting that the HDMI connection form is a form only for listening to a sound.

  As described above, the high sound quality output mode is a mode for preferentially outputting an audio signal. In the high sound quality output mode, the controller 22 executes at least one of the following first to fourth signal controls. .

  The first signal control will be described with reference to FIG.

  In the normal mode, as shown in FIG. 5A, the video signal and the audio signal obtained by decoding the AV stream data read from the medium 11a are output as HDMI signals as they are, but in the high sound quality output mode, the controller 22 The OSD processing unit 15 controls the video signal obtained by decoding the AV stream data, for example, data fluctuation such as a black screen (a full screen is black) shown in FIG. 5B. Change to a video signal with no video. The OSD processing unit 15 generates not a video signal from the AV decoder 14 but a video signal of a video having no data fluctuation, and supplies the video signal to the HDMI I / F 16. TMDS clock jitter may occur due to switching noise of the video signal, etc. High-frequency signals that can easily become noise sources by changing to a video signal with no data fluctuation, such as a black-screen video signal. And the stability of the power supply line is improved. Thereby, the quality of the sound output in a receiving side apparatus improves.

  The second signal control will be described with reference to FIG.

  In recent years, video quality has been improved, and a video signal obtained by decoding AV stream data read from the medium 11a is often a high-resolution video signal. Since the TMDS clock (signal) is generated from a video pixel clock (hereinafter referred to as a video clock signal), the video clock signal has a higher frequency when the resolution of the video becomes high. When the video clock signal has a high frequency, the TMDS clock frequency also increases. For example, the frequency of a TMDS clock generated from a video signal with a resolution of 480p (p represents progressive) is 27 MHz, and the frequency of a TMDS clock generated from a resolution of 720p and 1080i (i represents interlace) is 74.18 MHz. The frequency of the TMDS clock generated from the video signal with a resolution of 1080p is 148.36 MHz. Further, when the Deep Color (color depth) is 36 bits, it is 1.5 times the normal value. For example, the frequency of the TMDS clock generated from the video signal with the Deep Color 36 bits and the resolution 1080p is 222.54 MHz (= 148.36 × 1.5 MHz).

  On the other hand, for audio signal transmission, the frequency of the TMDS clock determined by the video resolution is often higher than necessary. Therefore, the controller 22 controls the OSD processing unit 15 to adjust the resolution of the original video so that the TMDS clock frequency is equal to or higher than the minimum TMDS clock frequency necessary for audio signal transmission. Change it. The OSD processing unit 15 generates a video signal with reduced resolution from the video signal supplied from the AV decoder 14 and supplies it to the HDMI I / F 16.

  FIG. 6A shows an audio signal and a video signal in the normal mode. On the other hand, FIG. 6B shows that the video image frame is made smaller than the normal mode video signal so that the frequency of the TMDS clock is close to the frequency of the TMDS clock necessary for audio signal transmission. In this example, a video signal with a reduced resolution is supplied to the HDMI I / F 16. As a result, the frequency of the TMDS clock output from the HDMI I / F 16 shown in FIG. 6B is lower than that shown in FIG. 6A.

  When the frequency of the TMDS clock is lowered, the noise source during transmission and the distortion of data during transmission can be suppressed, so that the accuracy of the TMDS clock is improved. If the accuracy of the TMDS clock is improved, the accuracy of the audio master clock generated from the TMDS clock is also improved in the receiving device, so that the quality of the sound output in the receiving device is improved.

  Here, the minimum TMDS clock frequency required for audio signal transmission will be described.

  In the HDMI signal, as shown in FIG. 7, an audio signal and control information are transmitted in a blank period between a video (video signal) and a video (video signal). Therefore, it is necessary to secure at least the blank period to transmit all the audio signals, and it has a blank period corresponding to the time required to transmit all the audio signals. The frequency of the TMDS clock generated from the video signal is the minimum TMDS clock frequency necessary for transmitting the audio signal.

  For example, in order to transmit a linear PCM (Pulse Code Modulation) audio signal having a sampling frequency of 48 kHz and 8 channels, it is sufficient that the frequency of the TMDS clock is 27 MHz. Therefore, the controller 22 sends the signal to the OSD processing unit 15. The video signal having a predetermined resolution supplied from the AV decoder 14 is changed to a video signal having a resolution of 480p.

  In addition, for example, in order to transmit a linear PCM with a sampling frequency of 192 kHz and the number of channels of 8 or an audio signal of HBR (High Bit Rate), it is sufficient that the frequency of the TMDS clock is 74.18 MHz. The OSD processor 15 changes the video signal having a predetermined resolution supplied from the AV decoder 14 to a video signal having a resolution of 720p.

  Next, the third signal control will be described.

As described above, the TMDS clock is supplied to the receiving-side apparatus. In addition, N and CTS (Cycle Time Stamp) values necessary for generating the audio master clock are also supplied by the HDMI signal. The receiving side apparatus generates an audio master clock satisfying a relationship of audio master clock = f _{TMDS clock} × N / CTS by using a supplied TMDS clock, N and CTS by a PLL (Phase Locked Loop) circuit. Then, the generated audio master clock divided by 1/128 becomes the sampling frequency f _s (ie, audio master clock = 128 × f _s ).

The N and CTS (Cycle Time Stamp) values required to generate this audio master clock are determined to be within a predetermined range in HDMI. It is free to set. In the normal mode, the frequency of the TMDS clock is determined by the video signal. However, in the high sound quality output mode, there is no need to display an image using the HDMI signal, so the controller 22 uses the relational expression of the audio master clock described above. , The product of the TMDS clock frequency and the value of N (f _{TMDS clock} × N) divided by the CTS value is zero, that is, the product of the TMDS clock frequency and the value of N (f _TMDS The frequency of the TMDS clock and the value of N are set in the HDMI I / F 16 in such a combination that the _clock × N) is exactly divisible by the value of CTS. HDMI I / F16 is the value of the TMDS clock frequency and N the remainder is zero when the product of the values of frequency and N the TMDS clock (f _{TMDS clock} × N) divided by the value of the CTS, the TMDS clock Change the frequency and N values. As a result, the accuracy of the TMDS clock generated by the reception-side apparatus is improved, so that the quality of sound output from the reception-side apparatus is improved.

  Next, the fourth signal control will be described with reference to FIG.

  The reproduction apparatus 1 is designed and manufactured by hardware so as to correspond to video signals of images with various assumed resolutions. Therefore, the frequency of the video clock signal that can be supported by the playback apparatus 1 is wide, for example, 27 MHz to 148 MHz. However, in hardware design, an optimal waveform (clean rectangular wave) is designed at a specific frequency (hereinafter referred to as the target frequency), and then a clock signal that does not interfere with use at other frequencies is generated. Design (adjustment) is made. As a result, for example, as shown in FIG. 8, a video clock signal having an optimal waveform like the waveform 41B is generated at the target frequency, but at a frequency lower than the target frequency, the waveform becomes distorted like the waveform 41A. At a frequency higher than the target frequency, ringing may occur as in the waveform 41C.

  Therefore, the controller 22 controls the OSD processing unit 15 to change the frequency of the video clock signal to the target frequency. The OSD processing unit 15 generates a video clock signal having a target frequency under the control of the controller 22 and supplies it to the HDMI I / F 16. As a result, the accuracy of the TMDS clock generated from the video clock signal in the HDMI I / F 16 is improved, so that the quality of the sound output in the receiving side device is improved.

  Even if each of the first to fourth signal controls described above is performed independently, the quality of the sound output from the receiving-side apparatus can be improved. The sound quality can be further improved than in the case of the case.

  FIG. 9 is a flowchart of the mode automatic switching process of the playback apparatus 1 that determines the HDMI connection form of FIGS. 2 to 3 and switches between the normal mode and the high sound quality output mode. This process is started, for example, when it is detected that an HDMI cable is connected to the HDMI terminal 17 and the playback device 1 is connected to another device (receiving device) via the HDMI terminal 17.

  First, in step S1, the controller 22 determines whether the number of connected devices is one. That is, the controller 22 checks the number of devices connected via the HDMI terminal 17 using the HDCP DEVICE_COUNT and DEPTH, and determines whether the number of devices is one.

  If it is determined in step S <b> 1 that the number of connected devices is 1, the process proceeds to step S <b> 2, and the controller 22 determines whether the connected device is the AV amplifier 32. As described above, the controller 22 can determine whether the connected device is the AV amplifier 32 based on the audio information or product information of the EDID. Note that as a process in which steps S1 and S2 are combined, the controller 22 may detect that the AV amplifier 32 is the only device connected via the HDMI terminal 17 based on the CEC information.

  If it is determined in step S2 that the connected device is the AV amplifier 32, the process proceeds to step S3, and the controller 22 sets the HDMI output mode of the playback device 1 to the high sound quality output mode. That is, the controller 22 controls the OSD processing unit 15 and the HDMI I / F 16 to execute at least one of the first to fourth signal controls described above. By executing at least one of the first to fourth signal controls, the video signal or the control signal based on the video signal is changed, and the changed video signal or the control signal based on the video signal is transmitted along with the audio signal to the HDMI. The signal is output from the HDMI terminal 17 as a signal.

  On the other hand, if it is determined in step S1 that the number of connected devices is not 1, and if it is determined in step S2 that the connected device is not the AV amplifier 32, the process proceeds to step S4. Proceeding, the controller 22 sets the HDMI output mode of the playback device 1 to the normal mode. That is, the controller 22 controls the OSD processing unit 15 and the HDMI I / F 16, and outputs a video signal and an audio signal as an HDMI signal based on a high-quality video signal based on the AV stream data read from the medium 11a. Let

  In step S5, the controller 22 determines whether there is a change in the HDMI connection, and repeats the process until it is determined that there is a change. If it is determined in step S5 that there is a change in the HDMI connection, it is determined in step S6 whether there is a device connected via the HDMI terminal 17.

  If it is determined in step S6 that there is a device connected via the HDMI terminal 17, the process returns to step S1, and the processes in steps S1 to S6 described above are repeated. On the other hand, if it is determined that there is no device connected via the HDMI terminal 17, the process ends.

  As described above, when the receiving side device is connected via the HDMI terminal 17, the mode automatic switching process of FIG. 9 is executed, and when the connected receiving side device is only the AV amplifier 32, the HDMI output is performed. The mode is set to the high sound quality output mode. As a result, high-quality sound can be output from the receiving-side device connected via the HDMI terminal 17. In other words, the AV amplifier 32 as a receiving side apparatus generates sound based on an audio signal transmitted in an environment that is less affected by TMDS clock jitter and power line noise generated by a high-quality video signal. Can be output.

  In the mode automatic switching process of FIG. 9, a change in connection is monitored (the process of step S5). Therefore, even when the HDMI connection between the AV amplifier 32 and the television receiver 31 is disconnected in the HDMI connection form of FIG. 3, it can be detected as the HDMI connection form of FIG. 4, and the HDMI output mode is set to the normal mode. Therefore, the AV amplifier 32 can output high quality sound.

  Further, for example, in the HDMI connection form of FIG. 3, even when the user turns off the television receiver 31 after instructing the playback of the playback device 1 on the GUI screen displayed on the television receiver 31, Similar to the disconnection of the HDMI connection between the AV amplifier 32 and the television receiver 31, a change in the HDMI connection is detected, and the HDMI output mode is changed from the normal mode to the high sound quality output mode. Sound can be output.

  Since the HDMI EDID and CEC information is used to determine the connected receiving side device, high-quality sound can be output from the AV amplifier 32 regardless of the device manufacturer or model.

  Up to this point, an example in which the playback device 1 automatically detects the HDMI connection and changes the HDMI output mode without requiring any user operation has been described. However, in the playback device 1, the user can select the normal mode from the setting screen. It is also possible to change the HDMI output mode by selecting either the high sound quality output mode.

  FIG. 10 is a flowchart of the mode manual switching process executed when the user sets (changes) the HDMI output mode on the setting screen.

  First, in step S11, the controller 22 determines whether the high sound quality output mode is selected by the user.

  If it is determined in step S11 that the high sound quality output mode has been selected, the process proceeds to step S12, and the controller 22 sets the HDMI output mode of the playback device 1 to the high sound quality output mode. The process of step S12 is the same as the process of step S3 described above.

  On the other hand, if it is determined in step S11 that the high sound quality output mode is not selected, that is, if the normal mode is selected by the user, the process proceeds to step S13, and the controller 22 outputs the HDMI output of the playback device 1 Set the mode to normal mode. The process in step S13 is the same as the process in step S4 described above.

  When the HDMI output mode is changed to either the high sound quality output mode or the normal mode in step S11 or S12, the process ends.

  High-quality sound can be output from the receiving-side device connected via the HDMI terminal 17 also by the mode manual switching process described above.

  As described above, according to the playback device 1, the receiving device connected by the HDMI terminal 17 is automatically determined or the connected receiving device is connected to the AV amplifier 32 according to a user instruction. Therefore, it is possible to output a high-quality sound from the AV amplifier 32. That is, it is possible to provide an HDMI signal that can be output with high sound quality.

  In order to execute the processing for outputting the high-quality sound, it is not necessary to add any hardware to the playback apparatus 1, and therefore it can be easily realized.

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a program recording medium in a general-purpose personal computer or the like.

  FIG. 11 is a block diagram illustrating a hardware configuration example of a computer that executes the above-described series of processing by a program.

  In a computer, a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, and a RAM (Random Access Memory) 103 are connected to each other via a bus 104.

  An input / output interface 105 is further connected to the bus 104. The input / output interface 105 includes an input unit 106 including a keyboard, a mouse, and a microphone, an output unit 107 including a display and a speaker, a storage unit 108 including a hard disk and nonvolatile memory, and a communication unit 109 including a network interface. A drive 110 for driving a removable medium 111 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is connected.

  In the computer configured as described above, the CPU 101 loads, for example, the program stored in the storage unit 108 to the RAM 103 via the input / output interface 105 and the bus 104 and executes the program. Is performed.

  The program executed by the computer (CPU 101) is, for example, a magnetic disk (including a flexible disk), an optical disk (CD-ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc), etc.), a magneto-optical disk, or a semiconductor. The program is recorded on a removable medium 111 that is a package medium including a memory or the like, or is provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  The program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.

  In this specification, the steps described in the flowcharts include processes that are executed in parallel or individually even if they are not necessarily processed in time series, as well as processes that are executed in time series in the described order. Is also included.

  The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, each configuration of the playback device 1 described above can be realized as a playback block of a recording / playback device having a video and sound playback function and a video recording function.

  In the above-described example, the HDMI connection form detects the connection form of FIG. 4, that is, the form in which only the AV amplifier is connected. The HDMI connection form may be used.

It is a block diagram which shows the structural example of one Embodiment of the reproducing | regenerating apparatus to which this invention is applied. It is a figure which shows the example of a HDMI connection form. It is a figure which shows the example of a HDMI connection form. It is a figure which shows the example of a HDMI connection form. It is a figure explaining the 1st signal control when the high sound quality output mode is set. It is a figure explaining the 2nd signal control when the high sound quality output mode is set. It is a figure explaining the 2nd signal control when the high sound quality output mode is set. It is a figure explaining the 4th signal control when the high-quality sound output mode is set. 3 is a flowchart for explaining mode automatic switching processing by the playback apparatus of FIG. 1. 3 is a flowchart for explaining mode manual switching processing by the playback apparatus of FIG. 1. It is a block diagram which shows the structural example of one Embodiment of the computer to which this invention is applied.

Explanation of symbols

  1 playback device, 15 OSD processing unit, 16 HDMI I / F, 17 HDMI terminal, 21 operation input unit, 22 controller

Claims (8)

Reproducing means for reading out a video signal and an audio signal recorded in a predetermined recording medium;
An HDMI terminal for outputting a signal corresponding to the video signal and the audio signal by an HDMI signal;
Detecting means for detecting whether the connection form of the device connected via the HDMI terminal is a form only for listening to sound;
A signal control means for changing the video signal or a control signal based on the video signal when the connection form is detected to be a form only for listening to sound; and
The output terminal outputs the changed video signal or a control signal based on the video signal together with the audio signal by the HDMI signal. The playback apparatus according to claim 1, wherein the signal control unit changes the video signal of a predetermined video read from the predetermined recording medium into a video signal of a video with no data variation. The signal control means is configured such that the video signal having a predetermined resolution read from the predetermined recording medium has a TMDS clock frequency equal to or higher than a TMDS clock frequency required for transmission of the audio signal, and The playback apparatus according to claim 1, wherein the video signal is changed to a video signal having a resolution lower than the resolution. The signal control means includes a TMDS clock frequency and a N value based on the video signal, a TMDS clock frequency at which a remainder when the product of the TMDS clock frequency and the N value is divided by a CTS value becomes zero. The playback device according to claim 1, wherein the playback device is changed to a value of N. The playback apparatus according to claim 1, wherein the signal control unit changes a TMDS clock generated from the video clock signal by changing a frequency of a video clock signal based on the video signal to a target frequency. The information processing apparatus according to claim 1, wherein the detection unit detects whether the connection form is a form only for listening to sound based on EDID information or CEC information. A playback device including an HDMI terminal that reads a video signal and an audio signal recorded on a predetermined recording medium and outputs a signal corresponding to the video signal and the audio signal by an HDMI signal,
Detecting whether the connection form of the device connected via the HDMI terminal is a form only for listening to sound,
When the connection form is detected to be a form only for listening to sound, the video signal or a control signal based on the video signal is changed,
A playback control method for outputting the changed video signal or a control signal based on the video signal together with the audio signal by the HDMI signal. On the computer,
Control the readout of video and audio signals recorded on a given recording medium,
Detect whether the connection form of the device connected via the HDMI terminal that outputs the HDMI signal is a form only for listening to sound,
When the connection form is detected to be a form only for listening to sound, the video signal or a control signal based on the video signal is changed,
A program for executing a process of outputting the changed video signal or a control signal based on the video signal together with the audio signal by the HDMI signal.

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