JP4719111B2 - Audio reproduction device, video / audio reproduction device, and sound field mode switching method thereof - Google Patents

Description

  The present invention relates to an audio playback device, a video / audio playback device, and a sound field mode switching method thereof, and in particular, an audio playback device that realizes switching of a sound field mode without a sense of incongruity when switching the sound field mode, and video / audio playback. The present invention relates to a device and a sound field mode switching method.

A television receiver that receives digital broadcasting receives a television program and genre information and channel information added thereto. The television receiver can perform control such as switching to the sound field mode suitable for the program content based on the additional information. For example, according to Japanese Patent Laying-Open No. 2005-84459 (Patent Document 1), when it is detected that an audio attribute has been changed from an input audio signal, the rear fill is switched on / off, or the audio format of the original content is changed. A technology for switching on / off of Prologic (registered trademark) or the like in accordance with the above is described.
JP-A-2005-84459

  The prior art described in the above-mentioned Patent Document 1 is changed by detecting a change in audio attribute and switching the output of the audio amplifier by muting the output of the audio amplifier for a certain period or providing a silent reproduction period. The operating condition of the audio amplifier is changed so as to correspond to the later audio attribute. Therefore, when switching the output of the audio amplifier, there is a problem that the reproduced sound is interrupted or becomes discontinuous, and the switching cannot be performed smoothly, and the user feels uncomfortable.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a sound reproduction apparatus capable of smoothly switching the output state of an audio amplifier without causing the reproduction sound to be interrupted or discontinuous when the output of the audio amplifier is switched. Another object of the present invention is to provide a video / audio reproduction device and a method for switching the sound field mode.

The audio output device of the present invention can output audio in a plurality of sound field modes, and outputs an audio signal output from the prologic 2 processing block or a virtual surround processing block in which virtual surround processing is performed after the prologic 2 processing. When outputting to the output channel as a left channel audio signal, a center channel audio signal, or a right channel audio signal, one of the audio signals output from the prologic 2 processing block or the virtual surround processing block Is selected by a selector and output to the same gain adjusting unit to adjust the gain, in a sound field mode in which the prologic 2 processing block is used and the virtual surround processing Sound between sound field modes where blocks are used When switching modes, another sound field mode in which the gain of the gain adjusting unit is 0 is passed between the sound field mode before switching and the sound field mode after switching, and the sound field mode before switching is changed to the other sound field mode. Up to the sound field mode, the value of the gain adjustment unit in the sound field mode before switching is interpolated as an initial value, and the gain 0 of the gain adjustment unit in the other sound field mode is interpolated as a final value, and the other sound field mode Until the sound field mode after switching is interpolated with the gain 0 of the gain adjusting unit in the other sound field mode as an initial value and the value of the gain adjusting unit in the sound field mode after the switching as a final value. Each gain to be set in the gain adjustment unit in the period is set in the gain adjustment unit, and when the gain of the gain adjustment unit reaches 0, the audio input to the gain adjustment unit No. The output of the virtual surround processing block from an output of the Pro Logic 2 processing block, or with a sound field change processing means for switching by the selector to the output of the Pro Logic 2 processing block from an output of the virtual surround processing block It is characterized by that .
Also, the audio output device of the present invention, the input side of the gain adjustment unit, and a signal delay circuit for adjusting the timing deviation due to the time delay of the virtual surround processing blocks or / and the Pro Logic 2 processing block It is characterized by that.
The video / audio output apparatus of the present invention includes any one of the above-described audio output apparatuses.
Also, the sound field mode switching method of the present invention can output sound in a plurality of sound field modes, and is output from the prologic 2 processing block or the virtual surround processing block in which virtual surround processing is performed after the prologic 2 processing. When the audio signal is output to the output channel as the audio signal of the left channel, the audio signal of the center channel, or the audio signal of the right channel, any one output from the prologic 2 processing block or the virtual surround processing block In the sound field mode switching method of the sound output device configured to select one of the sound signals by the selector and output the same to the same gain adjusting unit to adjust the gain , the prologic 2 processing block uses Sound field mode and virtual surround processing Switching between the sound field mode between a lock is used, the allowed gain adjustment value of the gain adjustment unit is via the other sound field mode is 0, when passing through the other sound field mode, before switching of the sound The gain set in the gain adjustment unit in the field mode is set as an initial value, the gain 0 set in the gain adjustment unit in the other sound field mode passing through is set as an intermediate value, and the gain in the sound field mode after switching is set The gain set in the adjustment unit is the final value, and each gain to be set in the gain adjustment unit in the transition period is obtained by interpolating from the initial value and the intermediate value from the initial value to the intermediate value, from the intermediate value to the final value is set to the gain adjustment unit determined by interpolation from the final value and the intermediate value, gain set to the gain adjusting unit reaches the intermediate value 0 through On the other hand, an audio signal input to the gain adjusting unit is output from the output of the prologic 2 processing block to the output of the virtual surround processing block by the selector or from the output of the virtual surround processing block to the output of the prologic 2 processing block. It is characterized by switching to output .
Also, the sound field mode switching method of the present invention is characterized in that so as to adjust the virtual surround processing blocks or / and timing shift due to the time lag of the Pro Logic 2 processing block.

  According to the present invention, when the sound field mode is switched, the reproduced sound is not interrupted or discontinuous, and the output state of the audio amplifier can be switched smoothly.

  Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

  1 to 3 show a television receiver (video / audio reproduction device, reception means) 1, an audio device (audio reproduction device, audio reproduction means) 2, a recorder (program recording / reproduction device, video / audio reproduction device, reception). Means) 3 to 5 are connected by HDMI cables 6 to 9 having HDMI (High Definition Multimedia Interface) terminals 10 to 17 and an optical cable 18 to transmit / receive AV signals and program information signals. 1 to 3 show the first to third embodiments.

  FIG. 1 shows a first embodiment in which a television receiver 1 and an audio device 2 are connected by an HDMI cable 6 and an optical cable 18. FIG. 2 shows a television receiver 1 and two recorders 3 and 4 connected to an HDMI cable 7 and FIG. 3 shows a television receiver 1 and an audio device 2 connected by an HDMI cable 6 and an optical cable 18, and the audio device 2 and a recorder 5 are connected by an HDMI cable 9. This is the third embodiment. The television receiver 1 is a video / audio reproduction device or reception means, which can directly receive and reproduce a broadcast program, and also receives an AV signal (audio / visual) input from an external device via the HDMI cables 6 to 9. The program can be reproduced based on the signal (including video signal and audio signal). The audio device 2 is an audio reproduction device and audio reproduction means, and can reproduce audio based on audio signals input via the HDMI cables 6 to 9 and the optical cable 18. The recorders 3 to 5 are program recording / playback apparatuses, video / audio playback apparatuses, or receiving means, which can directly receive, record and play back AV signals of broadcast programs, and play back the reproduced AV signals with the HDMI cable 6. To 9 can be output to the outside. Although not shown, the recorders 3 to 5 can record and reproduce AV signals inputted from the outside.

  The HDMI terminals 10 to 17 are developed by arranging display connection technology DVI (Digital Visual Interface) terminals for AV (audio / visual) related devices, and are connected terminals based on interface standards for next-generation televisions. It is. The HDMI terminal can send video signals, audio signals, and control signals together with a single cable, and the control signals can be transmitted in both directions, allowing simple connection between devices and one remote control. With this, a plurality of AV devices (audio / visual devices) can be controlled.

  FIG. 4 shows a detailed connection relation of the HDMI cables 6 to 9 in FIGS.

  In FIG. 4, reference numeral 21 denotes an HDMI source which is a sending side of video data and audio data, and 22 denotes an HDMI sink which is a receiving side of video data and audio data. For example, in FIG. 2, the recorder 3 and the recorder 4 correspond to the HDMI source 21, and the television receiver 1 corresponds to the HDMI sink 22. The HDMI source 21 includes an HDMI transmitter 23, and the HDMI sink 22 includes an HDMI receiver 24. Reference numeral 25 denotes an HDMI cable having HDMI terminals 26 and 27 at both ends.

  The video signal, audio signal, and control status signal input to the HDMI transmitter 23 are serially transmitted to the HDMI sink 22 through the TMDS channel 28 (TMDS channels 0 to 2 and TMDS clock channel). The HDMI sink 22 reproduces the video signal, the audio signal, and the control state signal transmitted through the TMDS channel 28 based on the clock signal transmitted through the TMDS clock channel. Note that the audio signal and the control state signal are transmitted using the blanking period of the video signal.

  The HDMI cable 25 is also provided with a CEC (Consumer Electronics Control) line 29 and a DDC (Display Data Channel) line 30. The CEC line 29 and the DDC line 30 are bidirectional lines, and control signals are exchanged between devices through these signal lines.

  For example, as will be described later, in order to switch the sound field mode of the television receiver 1 and the audio device 2, between the television receiver 1, the audio device 2, and the recorders 3 to 5, program genre information and the number of channels (related to content) Control signals corresponding to the additional information) are exchanged through the CEC line 29. In addition, for example, the television receiver 1 and the recorders 3 to 5 can change the video display specifications, audio output specifications, and the like of externally connected devices directly or indirectly from the EDID (Extended Display Identification) -ROM 31 to the DDC line 30. The video signal and audio signal conforming to the specifications of the connected device are transmitted.

  FIG. 5 is a schematic control block diagram showing the third embodiment of FIG.

  In FIG. 5, reference numerals 41 to 43 denote host CPUs. Reference numeral 44 is a monitor microcomputer, and 45 and 46 are front microcomputers. Reference numerals 47 to 49 denote interface circuits. Reference numerals 50 and 51 denote HDMI receiving LSIs. Reference numerals 52 and 53 denote HDMI transmission LSIs. The interfaces 47, 48 and 49 are connected by a CEC line. The HDMI receiving LSI is an LSI that is an HDMI receiver 24, and the HDMI transmitting LSIs 52 and 53 are LSIs that are an HDMI transmitter 23.

  The HDMI transmission LSI 53 is connected to the HDMI transmission LSI 53 as a transmission destination. The HDMI transmission LSI 52 is connected to the HDMI transmission LSI 52 as a transmission destination. The HDMI transmission LSI 53 is connected to the HDMI reception LSI 51 so that the HDMI reception LSI 51 can receive the data received from the HDMI transmission LSI 52.

  The host CPUs 41 to 43 can communicate with each other via the monitor microcomputer 44, the front microcomputers 45 and 46, the interface circuits 47 to 49, and the CEC line. The host CPUs 41 to 43 can control the HDMI transmission LSIs 52 and 53 to transmit a video signal, an audio signal, and a control status signal via the TMDS channel. Further, the HDMI receiving LSIs 50 and 51 can be controlled to receive a video signal, an audio signal, and a control status signal via the TMDS channel.

  Since the HDMI cable 6 can transmit only one direction of the video signal, the audio signal, and the control state signal, when the TV receiver 1 reproduces the audio of the program received from the broadcasting station through the speaker of the audio device 2, An optical cable 18 for sending audio data from the television receiver 1 to the audio device 2 is provided. Reference numerals 54 and 55 denote optical cable interfaces.

  For example, when the television receiver 1 receives the video signal and audio signal of the recorder 5 and displays and outputs the video according to a command from a remote controller (not shown) operated by the user, the host of the television receiver 1 The CPU 41 sends a control signal so as to transmit a video signal and an audio signal to the host CPU 43 of the recorder 5.

  This control signal is transmitted to the host CPU 43 via the monitor microcomputer 44, the interface circuit 47, the CEC line, the interface circuit 49, and the front microcomputer 46. Receiving the control signal from the host CPU 41, the host CPU 43 controls the HDMI transmission LSI 52 to transmit the video signal and the audio signal to the television receiver 1. The video signal and audio signal transmitted from the HDMI transmission LSI 52 are temporarily received by the HDMI reception LSI 51 of the audio device 2. At this time, the host CPU 42 determines that the received signal is not directed to itself, and transmits the video signal and the audio signal from the HDMI transmission LSI 53 to the television receiver 1 again. The video signal and the audio signal transmitted from the HDMI transmission LSI 53 are received by the HDMI reception LSI 50 of the television receiver 1 and when the host CPU 41 determines that the signal is transmitted to itself, the received data is captured.

  In this way, the television receiver 1 can perform video display and audio output based on the video signal and audio signal from the recorder 5. Also, the program genre information and the number of channels (additional information related to the content) reproduced by the recorder 5 are transferred from the host CPU 43 of the recorder 5 to the host CPU 41 of the television receiver 1, the front microcomputer 46, the interface circuit 49, the CEC line, and the interface circuit 47. And transmitted via the monitor microcomputer 44. The television receiver 1 controls the speaker output mode to a configuration suitable for the program according to the program genre information and the number of channels (additional information regarding the content). As another means, the program genre information reproduced from the recorder 5 and the number of channels (additional information regarding the content) itself are not sent, but the speaker output mode becomes suitable for the program based on this information. "Control information based on program information" (control information based on program information here is information for selecting a sound field mode suitable for the program from a plurality of sound field modes. ("VS mode" etc.) or a code corresponding to program information can be used).

  As another example, for example, in accordance with a command from a remote controller (not shown) operated by a user, video is displayed on the television receiver 1 based on the video signal of the recorder 5, and audio is based on the audio signal of the recorder 5. When audio is output from the device 2, the host CPU 41 sends a control signal to the host CPU 43 of the recorder 5 so that the video signal is transmitted to the television receiver 1 and the audio signal is transmitted to the audio device 2.

  This control signal is transmitted to the host CPU 43 via the monitor microcomputer 44, the interface circuit 47, the CEC line, the interface circuit 49, and the front microcomputer 46. The host CPU 43 that has received the control signal from the host CPU 41 controls the HDMI transmission LSI 52 to transmit a video signal to the television receiver 1 and transmit an audio signal to the audio device 2. The video signal and audio signal transmitted from the HDMI transmission LSI 52 are temporarily received by the HDMI reception LSI 51 of the audio device 2. At this time, the host CPU 42 determines that the received video signal is not intended for itself, and transmits the video signal from the HDMI transmission LSI 53 to the HDMI reception LSI 50 of the television receiver 1 again. The video signal transmitted from the HDMI transmission LSI 53 is received by the HDMI reception LSI 50 of the television receiver 1. At this time, the host CPU 41 determines that the video signal has been transmitted to the host CPU 41 and captures the received data.

  In this way, the television receiver 1 displays the video on its own video table.

  On the other hand, the host CPU 42 determines that the audio signal is directed to itself, and therefore captures it as self-directed speech data. The audio device 2 outputs sound from its own speaker based on the captured speech data. Also, the program genre information and the number of channels (additional information related to the content) reproduced by the recorder 5 are transferred from the host CPU 43 of the recorder 5 to the host CPU 42 of the audio device 2 to the front microcomputer 46, the interface circuit 49, the CEC line, the interface circuit 48, It transmits via the front microcomputer 45. The audio device 2 controls the speaker output mode to a configuration suitable for the program according to the program genre information and the number of channels (additional information regarding the content). As another means, the program genre information reproduced from the recorder 5 and the number of channels (additional information regarding the content) itself are not sent, but a program in which the speaker output mode is suitable for the program based on this information. Control information based on the information may be sent.

  Thus, based on the video signal and audio signal of the recorder 5, video can be displayed by the television receiver 1 and audio can be output by the audio device 2. Further, the host CPU 43 converts the program genre information and the number of channels (additional information related to the content) via the CEC line of the HDMI cable 9 or the program information such that the speaker output mode is suitable for the program based on this information. Send control information based. Receiving these pieces of information, the audio device 2 controls the speaker output mode to a configuration suitable for the program.

  As still another example, for example, in response to a command from a remote controller (not shown) operated by a user, the television receiver 1 receives a broadcast program from a broadcast station and receives video. Is displayed on the television receiver 1 and audio is output from the audio device 2, video is displayed on the display unit of the television receiver 1 by normal processing of the television receiver 1, and audio is provided in the television receiver. The output from the speaker is stopped, and the audio data is sent to the audio device 2 through the optical cable 18 instead.

  Further, the host CPU 41 sends the program genre information and the number of channels (additional information regarding the contents) from the host CPU 41 of the television receiver 1 to the host CPU 42 of the audio device 2, the monitor microcomputer 44, the interface circuit 47, the CEC line, the interface circuit 48, the front It transmits via the microcomputer 45. The audio device 2 controls the speaker output mode to a configuration suitable for the program according to the program genre information and the number of channels (additional information regarding the content). As another means, the television receiver 1 does not send the program genre information or the number of channels (additional information regarding the content) itself, but program information that makes the speaker output mode suitable for the program based on this information. Control information based on the may be sent.

  Thereby, the video of the broadcast program received by the television receiver 1 can be displayed on the display of the television receiver 1, and the sound can be output from the speaker of the audio device 2 in the sound field mode corresponding to the content of the broadcast program. become.

  As described above, the television receiver 1, the audio device 2, and the recorder 5 interconnected by the HDMI cable and the optical cable can realize various reproduction modes by sending operation signals to the television receiver 1 with a remote controller. In addition to the above playback mode examples, various playback modes are possible. In this case, an optical cable is additionally provided at a location where audio data needs to be transmitted and received bidirectionally in order to realize the various playback modes. .

  FIG. 6 is a diagram showing in more detail the control configuration of the television receiver 1, the audio equipment 2, and the recorder 5 in the third embodiment shown in FIG.

  Referring to FIG. 6, the television receiver 1 according to the present embodiment includes an antenna 104, a tuner 105, a multiplexing / restoring unit 106, a video decoding unit 107, an audio decoding unit 120, and a content information decoding unit 111. , Display unit 109, audio control unit 121, system controller 115, left and right front speakers 129 and 130, center speaker 131, subwoofer 132, remote control light receiving unit 116, remote control 117, and amplifiers 125 to 128. A volume 124, a memory 118, an operation unit 119, selectors 108 and 112, an HDMI receiving LSI 110, a digital audio interface modulation unit 113, a light emitting element 114, a bidirectional interface circuit 133, and an EDID-ROM 134. It has.

  The tuner 105 selects a channel having a desired frequency from the broadcast signal received by the antenna 104, and performs demodulation processing. Note that broadcast signals received by the antenna 104 are terrestrial digital broadcast, BS digital broadcast, 110-degree CS digital broadcast, and the like, and signals demodulated by the tuner 105 are content video and audio signals and additional information related to the content. The information is output to the multiplexing restoration unit 106 as a multiplexed signal that is time-division combined. The content is not limited to a program supplied by a broadcast signal from a broadcasting station, but includes a program obtained via a network such as the Internet. In this case, the content video signal, audio signal, and A multiplexed signal obtained by time-division-combining additional information related to the content is output to the multiplexing restoration unit 106.

  The multiplexing / restoring unit 106 separates a video signal, an audio signal, and additional information of a program to be viewed based on the multiplexed signal input from the tuner 105 (or a network or a recording medium playback device). The separated video signal is output to the video decoding unit 107, the separated audio signal is output to the audio decoding unit 120, and the separated additional information is output to the content information decoding unit 111. The additional information is information such as a genre code multiplexed in the input signal and EPG (Electronic Programming Guide), and the genre of content (“movie”, “drama”, “music”, “documentary”, “ News "etc.).

  The video decoding unit 107 decodes the video signal input from the multiplexing / restoration unit 106, and the decoded video signal is output to the display unit 109 via the selector 108 and displayed. As the display unit 109, display means such as a liquid crystal display, a plasma display, or a CRT is used.

  The audio decoding unit 120 decodes the audio signal input from the multiplexing / restoration unit 106 via the selector 112, and the decoded audio signal is processed by the audio control unit 121 and then amplified via the volume 124. Amplified at 125 to 128 and output from the left and right front speakers 129 and 130, the center speaker 131, and the subwoofer 132.

  The content information decoding unit 111 decodes the additional information input from the multiplexing restoration unit 106, extracts a genre from the decoded additional information, and outputs the extracted genre to the system controller 115 as content information. . When a plurality of genres are set for the same content, that is, when the same content includes a plurality of genres as additional information, the extracted plurality of genres are output to the system controller 115.

  The audio control unit 121 is a sound quality adjusting unit that processes the audio signal decoded by the audio decoding unit 120, and includes a channel number conversion processing unit 191, a sound field change processing unit 192, an enhancement processing unit 193, and an equalizer. And a processing unit 194.

  The channel number conversion processing unit 191 has a function of converting the number of input channels of the audio signal decoded by the audio decoding unit 120. As the channel number conversion processing, for example, a 5.1ch audio signal is converted to 3.1ch or 1ch, 2ch audio signal to 1ch, 3.1ch audio signal to 1ch, downmix processing, 5.1ch audio signal to 3.1ch or 2ch, virtual surround processing, 2ch audio signal The matrix decoding process for converting the sound signal to 3.1ch or 5.1ch is performed, and the stereo conversion process for converting the audio signal of 1ch to 2ch is performed.

  The sound field change processing unit 192 has a function to change the sound field, that is, the listening environment, for example, a virtual surround process that feels as if there is a sound source behind, even though there is no speaker behind, A speaker position changing process for moving the virtual speaker position to the outside of the speaker is performed.

  The processing by the channel number conversion processing unit 191 and the sound field change processing unit 192 is a process for realizing each sound field mode such as virtual surround or prologic 2 (registered commercial law). The “VS mode” and the sound field mode realized by the prologic 2 are referred to as “PL2 mode”.

  The enhancement processing unit 193 has a function of enhancing the audio output from the center speaker 131 more than the audio output from other speakers. For example, the enhancement processing unit 193 amplifies only the audio signal output from the center speaker 131, the center A balance adjustment process for amplifying the audio signal output from the speaker 131 and reducing the audio signal output from another speaker is performed. The sound field mode in which the sound output from the center speaker 131 is emphasized more than the sound output from other speakers is referred to as a “voice enhancement mode”.

  The equalizer processing unit 194 has a function of controlling the sound quality by increasing / decreasing the gain for each frequency band, performing directivity correction processing for correcting the frequency characteristics depending on the directivity of the front speakers 129 and 130, and amplifying the bass. Perform bass enhancement processing.

  The volume 124 controls the sound pressure (volume) of each speaker according to instructions from the system controller 115.

  The remote control light receiving unit 116 receives an operation signal (infrared rays) from the remote control 117, converts the received operation signal into an electrical signal, and outputs the electrical signal to the system controller 115.

  The memory 118 stores the content information extracted by the content information decoding unit 111 and also stores a sound field mode table in which sound field modes are defined according to the content genre and the number of channels (described later). (See FIG. 9).

  The HDMI receiving LSI 110 separates and reproduces the video signal and the video signal from the signal received via the HDMI cable 6, outputs the video signal to the selector 108, and outputs the audio signal to the selector 112.

  The selector 108 selects either the video signal from the video decoding unit 107 or the video signal from the HDMI receiving LSI 110 according to an instruction from the system controller 115 and outputs the selected video signal to the display unit 109. The selector 112 selects either an audio signal from the multiplexing / restoration unit 106 or an audio signal from the HDMI receiving LSI 110 according to an instruction from the system controller 115, and sends the audio signal to the audio decoding unit 120 and the digital audio interface modulation unit 113. Output.

  The digital audio interface modulation unit 113 modulates the audio data input from the selector 112 into an optical cable transmission signal and outputs the optical cable transmission signal to the light emitting element 114. The light emitting element 114 emits light according to a signal from the digital audio interface modulation unit 113, and this light is transmitted toward the audio device 2 through the optical cable 18.

  A bidirectional interface circuit 133 is provided between the system controller 115 and the CEC line of the HDMI cable 6 to constitute a bidirectional buffer circuit for signals to be transmitted and received.

  The video display specifications and audio output specifications of the television receiver 1 are stored in the EDID-ROM 134, and these video display specifications or audio outputs are output to the audio device 2 and the recorder 5 via the DDC lines of the HDMI cables 6 and 9. Communicate specification information. Although not shown, since the HDMI terminal has a hot plug detection terminal, when the HDMI terminal is connected, the video display specification or audio output specification information is stored in the audio device using the hot plug detection function. 2 or the recorder 5.

  The audio device 2 according to the present embodiment includes a system controller 156, a selector 142, an audio demodulator 143, an audio controller 144, a volume 147, amplifiers 148 to 151, and left and right front speakers 152 and 153. A center speaker 154, a subwoofer 155, an HDMI receiving LSI 150, an HDMI transmitting LSI 160, a light receiving element 140, a digital audio interface demodulator 141, a bidirectional interface circuit 157, and an EDID-ROM 158. Yes.

  When an audio signal from the light emitting element 114 is input to the light receiving element 140 of the audio device 2 via the optical cable 18, the light receiving element 140 converts the optical signal into an electric signal and outputs it to the digital audio interface demodulation unit 141. The digital audio interface demodulator 141 demodulates the signal modulated for optical transmission, and the demodulated signal is input to the audio demodulator 143 via the selector 142 and demodulated as an audio signal. The demodulated audio signal is input to the audio control unit 144.

  The audio signal input to the audio control unit 144 is processed by the audio control unit 144 and then amplified by the amplifiers 148 to 151 via the volume 147, and the left and right front speakers 152 and 153, the center speaker 154, and the subwoofer 155. Audio output. The volume 147 controls the sound pressure of each speaker according to an instruction from the system controller 156.

  The audio control unit 144 is a sound quality adjusting unit that processes the audio signal demodulated by the audio demodulation unit 143, and includes a channel number conversion processing unit 181, a sound field change processing unit 182, an enhancement processing unit 183, and an equalizer process. Part 184.

  The channel number conversion processing unit 181 has a function of converting the number of channels of the audio signal demodulated by the audio demodulation unit 143. As the channel number conversion process, for example, a 5.1ch audio signal is converted to 3.1ch or 1ch. 2ch audio signal to 1ch, 3.1ch audio signal to 1ch downmix processing, 5.1ch audio signal to 3.1ch or 2ch virtual surround processing, 2ch audio signal to 3ch A matrix decoding process for converting to .1ch or 5.1ch, and a stereo conversion process for converting a 1ch audio signal to 2ch.

  The sound field change processing unit 182 has a function to change the sound field, that is, the listening environment, for example, a virtual surround process that feels as if there is a sound source behind, even though there is no speaker behind, A speaker position changing process for moving the virtual speaker position to the outside of the speaker is performed.

  The processing by the channel number conversion processing unit 181 and the sound field change processing unit 182 is performed in each sound field mode such as “VS mode” and “PL2 mode” in the same manner as the channel number conversion processing unit 191 and sound field change processing unit 192 described above. It is a process for realizing.

  The process by the enhancement processing unit 183 is a process for realizing the “voice enhancement mode” in the same manner as the enhancement processing unit 193.

  Similar to the equalizer processing unit 194, the equalizer processing unit 184 has a function of controlling the sound quality by increasing / decreasing the gain for each frequency band, and correcting the frequency characteristics due to the directivity of the front speakers 152, 153. In addition to processing, bass enhancement processing for amplifying bass is performed.

  A bidirectional interface circuit 157 is provided between the system controller 156 and the CEC line of the HDMI cables 6 and 9 to constitute a bidirectional buffer circuit for signals to be transmitted and received.

  The EDID-ROM 158 stores the audio output specification of the audio device 2 and transmits the audio output specification information to the television receiver 1 and the recorder 5 via the DDC lines of the HDMI cables 6 and 9. Although not shown, since the HDMI terminal has a hot plug detection terminal, when the HDMI terminal is connected, the video display specification and audio output specification information are received on the TV using the hot plug detection function. Is transmitted to the machine 1 or the recorder 5.

  The HDMI reception LSI 159 separates and reproduces the video signal and the video signal from the recorder 5 received via the HDMI cable, outputs the video signal to the HDMI transmission LSI 160, and outputs the audio signal to the HDMI transmission LSI 160 and the selector 142. To do.

  The HDMI transmission LSI 160 outputs the video signal and audio signal input from the HDMI reception LSI 159 to the HDMI reception LSI 110 of the television receiver 1 via the TMDS channel 167 of the HDMI cable 6. The signal output from the HDMI transmission LSI 160 to the HDMI reception LSI 110 is transmitted as a signal based on the HDMI standard (video, audio, clock signal called TMDS link) as shown in FIG.

  The selector 142 selects either an audio signal from the digital audio interface demodulator 141 or an audio signal from the HDMI receiving LSI 159 according to an instruction from the system controller 156 and outputs the selected audio signal to the audio composite unit 143.

  In addition, the recorder 5 of the present embodiment includes a system controller 172 and an HDMI transmission LSI 171. The HDMI transmission LSI 171 transmits the video data stored in the storage means inside the recorder 5 and the video signal and audio data from the HDMI transmission LSI 171 to the HDMI reception LSI 159 of the audio device 2 in accordance with an instruction from the system controller 172. In addition, the system controller 172 uses a hot plug detection function (not shown) to store video display specifications, audio output specifications stored in the EDID-ROM of the television receiver 1, or EDID-ROM of the audio device 2. The voice output specification data can be read through the DDC line 166. Further, the system controller 172 can exchange control signals with the system controllers 115 and 156 of the television receiver 1 or the audio equipment 2 through the CEC line 165. Although not shown, in the recorder, a bidirectional buffer is connected to the CEC line, and an EDID-ROM is connected to the DDC line in the same configuration as the bidirectional interface circuit 133 and the EDID-ROM 134 of the television receiver 1.

  Next, in response to a command from the remote controller 117 operated by the user, the television receiver 1 receives a broadcast program from a broadcasting station, displays an image on the display unit 109 of the television receiver 1, and the speaker 152 of the audio device 2. The flow of the video signal, audio signal, and control signal when audio is output from 155 will be described with reference to FIG. FIG. 7 is the same as the configuration diagram shown in FIG.

  As for the audio output specification of the audio device 2, when the television receiver 1 is connected to the audio device 2 via the HDMI cable 6, the audio output specification data of the EDID-ROM 158 is read by the system controller 115 and stored in the memory 118 in advance. It is remembered.

  First, it is assumed that the television receiver 1 is ready to receive a broadcast program from the antenna 104.

  When the user operates the remote controller, the television receiver 1 receives the broadcast program from the broadcast station, displays the video on the display unit 109 of the television receiver 1, and outputs the sound from the speakers 152 to 155 of the audio device 2. When instructed to switch, the system controller 115 that has received an instruction from the remote controller 117 switches the selector 108 so as to select the signal of the video decoding unit 107. Further, the selector 112 is switched so as to select the signal from the multiplexing restoration unit 106. Further, the gain of the volume 124 is set to 0 so that the audio output is not output from the speakers 129 to 132. At this time, the audio control unit 121 may stop operating.

  In addition, the system controller 115 instructs the system controller 156 to output sound from the speakers 152 to 155 of the audio device 2 through the CEC line. Upon receiving this command, the system controller 156 switches the selector 142 to select the signal of the digital audio interface demodulator 141, and changes the genre and the number of input channels of the broadcast program sent from the system controller 115 through the CEC line 169. Accordingly, the processing configuration of the audio control unit 144 is switched so that the optimum sound field mode is obtained.

  Therefore, the video signal decoded by the video decoding unit 107 is selected by the selector 108 and sent to the display unit 109, whereby the display unit 109 displays the video of the broadcast program. This video signal is indicated by a signal flow indicated by a solid line (A) in FIG.

  In addition, the genre extracted by the content information decoding unit 111 is output to the system controller 115. The content information decoding unit 111 decodes the additional information input from the multiplexing / restoration unit 106, extracts a genre from the decoded additional information, and outputs the genre to the system controller 115. The audio signal from the multiplexing restoration unit 106 is selected by the selector 112 and output to the audio decoding unit 120 and the digital audio interface modulation unit 113.

  Then, the number of input channels of the audio signal is decoded by the audio decoding unit 120. The system controller 115 reads the genre of the broadcast program from the content information decoding unit 111 and reads the number of channels from the audio decoding unit 120. The system controller 115 sends a signal corresponding to the genre of the read broadcast program and the number of input channels to the system controller 156 of the audio device 2. This command is indicated by a signal flow indicated by a one-dot chain line (b) in FIG.

  The system controller 156 that has received a signal corresponding to the broadcast program genre and the number of input channels allows the audio control unit 144 to perform an audio field mode that is optimal for the broadcast program genre and the number of input channels. The number of output channels and the sound field mode of the device 2 are changed.

  Since the audio signal output from the selector 112 is also output to the digital audio interface modulation unit 113, the audio signal is output from the digital audio interface modulation unit 113, the light emitting element 114, the optical cable 18, the light receiving element 140, and the digital audio interface demodulation. Is transmitted to the unit 141. The selector 142 selects the signal from the digital audio interface demodulator 141 and sends it to the audio demodulator 143. Since the audio control unit 144 has already been switched to a processing configuration that realizes a sound field mode that is optimal for the genre of broadcast program and the number of input channels, the speakers 152-2 are based on the audio signal processed by the audio control unit 144. 155. This audio signal is indicated by a signal flow indicated by a dotted line (c) in FIG.

  The sound output from the speakers 152 to 155 realizes an optimum sound field mode corresponding to the genre of the broadcast program and the number of input channels.

  Next, in accordance with a command from the remote controller 117 operated by the user, video is displayed on the television receiver 1 based on the video signal of the recorded program of the recorder 5, and on the audio device 2 based on the audio signal of the recorded program of the recorder 5. The flow of a video signal, an audio signal, and a control signal when outputting audio will be described with reference to FIG. FIG. 8 is the same as the configuration diagram shown in FIG.

  As for the audio output specification of the audio device 2, when the recorder 5 is connected to the audio device 2 via the HDMI cable 9, the audio output specification data of the EDID-ROM 158 is read by the system controller 172 and stored in the system controller 172 in advance. Stored in the means.

  First, it is assumed that the recorder 5 is recording a broadcast program. At this time, the genre information of the broadcast program is also recorded as the recording information.

  When the user operates the remote controller to instruct the system controller 115 to display video on the television receiver 1 based on the video signal of the recorder 5 and to switch to audio output on the audio device 2 based on the audio signal of the recorder 5. Upon receiving the command from the remote controller 117, the system controller 115 switches the selector 108 so as to select the video signal of the HDMI receiving LSI 110. Further, the gain of the volume 124 is set to 0 so that the audio output is not output from the speakers 129 to 132.

  At this time, the broadcast receiver (the tuner 105, the multiplexing / restoration unit 106, the video decoding unit 107, the content information decoding unit 111) and the audio processing unit (the audio decoding unit 120, the audio control unit 121) of the television receiver 1 are used. The digital audio interface modulation unit 113 and the light emitting element 114) are preferably stopped operating.

  Further, the system controller 115 instructs the system controller 156 to reproduce the audio signal from the recorder 5 through the speakers 152 to 155 of the audio device 2 through the CEC line 169 of the HDMI cable 6. Receiving this command, the system controller 156 switches the selector 142 so as to select the audio signal of the HDMI receiving LSI 159. In addition, the processing configuration of the audio control unit 144 is switched so as to be in the optimum sound field mode according to the genre of the broadcast program transmitted from the recorder 5 through the CEC line 165 of the HDMI cable 9 and the number of input channels.

  Therefore, the video signal transmitted via the HDMI transmission LSI 171 of the recorder 5, the HDMI reception LSI 159 of the audio device 2, the HDMI transmission LSI 160, and the HDMI reception LSI 110 of the television receiver 1 is selected by the selector 108 and displayed. 109, whereby the display unit 109 displays the video of the broadcast program. The flow of this video signal is indicated by a solid line (d) in FIG.

  Further, the information on the genre and the number of channels extracted by the system controller 172 is output to the system controller 156 of the audio device 2. The flow of this control signal is indicated by a dashed line (e) in FIG. The system controller 156 that has received a signal corresponding to the genre of the broadcast program and the number of input channels performs processing for changing the number of output channels and the sound field mode of the audio device 2, so that the optimum sound for the genre of the recorded program and the number of input channels is obtained. The processing configuration is switched to realize the field mode.

  The audio signal input to the selector 142 via the HDMI transmission LSI 171 of the recorder 5 and the HDMI reception LSI 159 of the audio device 2 is selected by the selector 142 and sent to the audio demodulation unit 143. Since the audio control unit 144 has already been switched to a processing configuration that realizes a sound field mode that is optimal for the genre of broadcast program and the number of input channels, the speakers 152-2 are based on the audio signal processed by the audio control unit 144. 155. The flow of this audio signal is indicated by a dotted line (f) in FIG. The sound output from the speakers 152 to 155 realizes an optimum sound field mode corresponding to the genre of the recorded program and the number of input channels.

  Next, the processing configuration of the audio control units 121 and 144 for realizing the optimum sound field mode according to the genre and the number of input channels, and the processing change will be described.

  FIG. 9 is a sound field mode table for determining the sound field mode according to the number of input channels and the genre.

  As shown in FIG. 9, when the number of input channels is 5.1ch and the genre is movie, sports, animation / special effects, the sound field mode is "VS mode", the number of input channels is 5.1ch, the genre is music, theater / Pure playback mode for performances, dramas, and variety; "voice enhancement mode" for 5.1ch input channels, news / reports, information / wide show, documentary / cultural, hobby / education, welfare When the number of input channels is 2ch and the genre is a movie, the sound field mode is “PL2 → VS mode” (→ indicates that VS processing is performed after PL2 processing), the number of input channels is 2ch, and the genre is For drama, variety, sports, animation / special effects, the sound field mode becomes “PL2 mode”. When the number of channels is 2ch, the genre is music, and the theater / performances, the sound field mode is "pure playback" or "OFF mode", the input channel number is 2ch, the genre is news / report, information / wide show, documentary / education The sound field mode is “voice enhancement mode” for hobbies / education and welfare, the number of input channels is 1ch, the genre is music, and the theater / performance is the sound field mode “pure playback mode”, and the number of input channels is 1ch. When the genre is movie, drama, variety, sports, animation / special effects, news / report, information / wide show, documentary / cultural, hobby / education, welfare, the sound field mode is “voice enhancement mode”. The sound field mode table shown in FIG. 9 is an example, and other correspondence relationships may be used. It is possible to assign a genre to a portion where the genre is blank in the 5.1ch, 1ch OFF mode.

  In the present embodiment, this sound field mode table is stored in the memory 118, and the genre and the number of input channels are extracted from the content information of the program to be reproduced, and the extracted genre is referred to by referring to this sound field mode table. The processing configuration of the audio control unit 121 or 144 is switched so that a sound field mode corresponding to the number of input channels is realized.

  10 and 11 conceptually show the processing of the audio control unit 121 or 144 for realizing each sound field mode of FIG. 9 as a block, and input channel signals (LS, L, R, C, RS). An audio signal conversion process from the input unit to the output channel signal (L, R, C, LFE) output unit is shown. 10 is a conceptual diagram of processing when 5.1ch is input, and FIG. 11 is a conceptual diagram of processing when 2ch or 1ch is input. The audio control unit 121 (or 144) shown in FIG. 10 and FIG. 11 has an internal configuration that is controlled in accordance with the number of input channels, and is the same in hardware.

  10 and 11, LS is an audio signal of the left surround channel, L is an audio signal of the left channel, C is an audio signal of the center channel, R is an audio signal of the right channel, RS is an audio signal of the right surround channel, and LFE. Is an audio signal of a sound effect of low sound (20 Hz to 120 Hz). In the following description, symbols LS, L, R, C, and RS are commonly used for input and output of each processing block, but each audio signal input to each processing block is used as an LS input signal, an L input signal, and an R input. Signals, C input signals, and RS input signals are described, and audio signals output from the respective processing blocks are described as LS output signals, L output signals, R output signals, C output signals, and RS output signals. In addition, the left speaker to which the L output signal of the audio control unit 121 (or 144) is input as the speaker for audio output, the right speaker to which the R output signal of the audio control unit 121 (or 144) is input, and the audio control unit 121 ( Alternatively, a subwoofer for low sound to which three channels of the center speaker to which the C output signal of 144) is input and an LFE output signal of the audio control unit 121 (or 144) is additionally input is assumed.

  In FIG. 10, reference numeral 201 denotes a virtual surround processing block (hereinafter referred to as a VS processing block). Reference numeral 203 denotes a processing block for synthesizing a low-pitched audio signal (hereinafter referred to as a BASS processing block). Reference numerals 208 and 209 denote signal delay circuits (delays). L, R that have passed through the VS processing block 201 with respect to the timing at which the LS, L, R, C, and RS signals reach the input unit of the signal delay circuit 208 directly Since the timing at which the C signals reach the input section of the signal delay circuit 209 is shifted in time, this is a signal delay circuit that adjusts and outputs these signal timings to match. Reference numeral 206 denotes a processing block (hereinafter referred to as a mixer processing block) that mixes audio signals with a predetermined gain.

  The Mixer processing block 206 includes gain adjustment units L1 to L8, C1 to C8, and R1 to R8 that adjust the magnitude of the signal, an adder 212 that calculates the sum of the signals output from the gain adjustment units L1 to L8, and gain adjustment. An adder 213 that calculates the sum of the signals output from the units C1 to C8 and an adder 214 that calculates the sum of the signals output from the gain adjustment units R1 to R8 are provided.

  The BASS processing block 203 includes an adder 215 that calculates the sum of output signals from the adders 212, 213, and 214.

  FIG. 11 shows processing at the time of 2ch input and 1ch input. When the 2ch is input, the L signal and the R signal are input, and when the 1ch is input, the C signal (indicated by a dotted line) is input.

  In FIG. 11, 207 is a prologic 2 processing block (hereinafter referred to as a PL2 processing block), and 202 is a VS processing block. Reference numeral 205 denotes a selector that selects and passes either the L, C, R output signal of the PL2 processing block 207 or the L, C, R output signal of the VS processing block 202. That is, in the “PL2 mode”, the selector 205 passes the audio signal from the PL2 processing block 207 and blocks the audio signal from the VS processing block 202. In the “PL2 → VS mode”, the selector 205 passes the audio signal from the VS processing block 202 and blocks the audio signal from the PL2 processing block 207. In the “PL2 → VS mode”, the LS, L, C, R, and RS output signals of Prologic 2 are generated in the PL2 processing block 207, and the virtual surround L, C, and R output signals are generated in the VS processing block 202. The audio control unit 121 (or 144) is configured so as to be generated.

  Reference numerals 210 and 211 denote signal delay circuits (delays), and the L, R, and C signals that have passed through the PL2 processing block 207 and the selector 205 with respect to the timing at which each signal reaches the input unit of the signal delay circuit 210 directly. , R, and C signals, or the L, R, and C signals that have passed through the PL2 processing block 207, the VS processing block 202, and the selector 205 reach the input unit of the signal delay circuit 211 in time. Therefore, the signal delay circuit adjusts and outputs these signal timings so as to match. In addition, the same reference numerals as those in FIG. 10 denote the same components.

  The VS processing block 201, the VS processing block 202, and the PL2 processing 207 block are not shown for internal processing. For example, since the virtual surround processing of the VS processing blocks 201 and 202 performs crosstalk cancellation processing, the input signals LS, L, R, C, and RS are processed in a complicated combination, but these are not expressed. The VS processing blocks 201 and 202 are processing blocks for realizing a virtual surround sound field mode, and various conventionally proposed methods (for example, JP-A-8-146974, JP-A-9-46800, and JP-A-Hei. 10-66198 publication etc.) can be applied. The PL2 processing block 207 is a processing block for realizing a sound field mode of Dolby Surround Pro Logic 2 (registered trademark). Since the processing contents of these VS processing block and PL2 processing block are known techniques, detailed description thereof will be omitted.

  FIGS. 12, 13, and 14 show the gains of the gain adjusters L1 to L8, C1 to C8, and R1 to R8 of the mixer processing block 206 in each sound field mode realized by the number of input channels.

  FIG. 12 shows the gains of the gain adjusting units L1 to L8, C1 to C8, and R1 to R8 in the VS mode, the pure playback mode / voice enhancement mode, and the OFF mode when 5.1ch is input.

  In the 5.1ch input VS mode, the gain of the gain adjustment unit of the mixer processing block 206 is L6 = 1, C7 = 1, R8 = 1, and the others are all zero. At this time, since the gains of the gain adjustment units L1 to L5, C1 to C5, and R1 to R5 are all 0, the signal from the signal delay circuit 208 does not pass through the mixer processing block 206.

  Further, since the gain of the gain adjustment unit of the mixer processing block 206 is L6 = 1, C6 = 0, and R6 = 0 with respect to the L output signal output from the signal delay circuit 209, the L output of the VS processing block 201 is obtained. The signal passes through the gain adjustment unit L6 (gain 1) of the mixer processing block 206 and the adder 212, and becomes the L output signal of the audio control unit 121 (or 144).

  Further, since the gain of the gain adjustment unit of the mixer processing block 206 is L7 = 0, C7 = 1, and R7 = 0 with respect to the C output signal output from the signal delay circuit 209, the C output of the VS processing block 201 The signal passes through the gain adjustment unit C7 (gain 1) of the mixer processing block 206 and the adder 213, and becomes the C output signal of the audio control unit 121 (or 144).

  Further, since the gain of the gain adjustment unit of the mixer processing block 206 is L8 = 0, C8 = 0, and R8 = 1 with respect to the R output signal output from the signal delay circuit 209, the R output of the VS processing block 201 The signal passes through the gain adjustment unit R8 (gain 1) of the mixer processing block 206 and the adder 214, and becomes the R output signal of the audio control unit 121 (or 144).

  As described above, by adjusting the configuration of the audio control unit 121 (or 144), the LS, L, R, C, and RS audio signals input to the audio control unit 121 (or 144) are processed by VS processing. The virtual surround processing is performed by the block 201 and is output from the audio control unit 121 (or 144) as 3.1ch virtual surround L, R, C, and LFE audio signals.

  In the 5.1ch input pure playback mode, the gain of the gain adjustment unit of the mixer processing block 206 is L1 = 1 / √2, L2 = 1, C3 = 1, R4 = 1, R5 = 1 / √2. All others are zero. At this time, since the gains of the gain adjusters L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 209 does not pass through the mixer processing block 206.

  The LS output signal of the signal delay circuit 208 is input to the gain adjustment unit L1 of the mixer processing block 206 and multiplied by 1 / √2. The L output signal of the signal delay circuit 208 is input to the gain adjustment unit L2 of the mixer processing block 206. The signal is input and multiplied by 1, and then the signals of the gain adjusting units L1 and L2 are added by the adder 212 to become the L output signal of the audio control unit 121 (or 144).

  Further, the C output signal of the signal delay circuit 208 is input to the gain adjustment unit C3 of the mixer processing block 206, multiplied by 1, and then passed through the adder 213 to become the C output signal of the audio control unit 121 (or 144).

  In addition, the RS output signal of the signal delay circuit 208 is input to the gain adjustment unit R5 of the mixer processing block 206 and multiplied by 1 / √2, and the R output signal of the signal delay circuit 208 is input to the gain adjustment unit R4 of the mixer processing block 206. The signal is input and multiplied by 1. Thereafter, the signals of the gain adjusting units R5 and R4 are added by the adder 214 to be the R output signal of the audio control unit 121 (or 144).

  In the 5.1ch input voice enhancement mode, the gain of the gain adjustment unit of the mixer processing block 206 is L1 = 1 / √2 * 1 / √2, L2 = 1 * 1 / √2, C3 = 1, R4 = 1 * 1 / √2, R5 = 1 / √2 * 1 / √2, and all others are zero. At this time, since the gains of the gain adjusters L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 209 does not pass through the mixer processing block 206.

The LS output signal of the signal delay circuit 208 is multiplied by 1 / √2 * 1 / √2 by the gain adjustment unit L1 of the mixer processing block 206, and the L output signal of the signal delay circuit 208 is multiplied by the gain adjustment unit of the mixer processing block 206. The signal of gain adjusting units L1 and L2 is added by an adder 212 to obtain an L output signal of the audio control unit 121 (or 144).
Further, the C output signal of the signal delay circuit 208 passes through the gain adjustment unit C3 (gain 1) and the adder 213 of the mixer processing block 206, whereby the C output signal of the audio control unit 121 (or 144) is obtained.

  Further, the RS output signal of the signal delay circuit 208 is multiplied by 1 / √2 * 1 / √2 by the gain adjustment unit R5 of the mixer processing block 206, and the R output signal of the signal delay circuit 208 is multiplied by the gain adjustment unit of the mixer processing block 206. The signal is multiplied by 1 / √2 by R4, and then the signals of the gain adjusting units R5 and R4 are added by the adder 214 to obtain the R output signal of the audio control unit 121 (or 144).

  In the OFF mode at the time of 5.1ch input, the gain of the gain adjustment unit of the mixer processing block 206 is L1 = 1 / √2 * 1 / √2, L2 = 1, L3 = 1 * 1 / √2, R3 = 1 / √2, R4 = 1R, 5 = 1 / √2, and all others are zero. At this time, since the gains of the gain adjusters L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 209 does not pass through the mixer processing block 206.

  Further, the LS output signal of the signal delay circuit 208 is multiplied by 1 / √2 by the gain adjustment unit L1 of the mixer processing block 206, and the L output signal of the signal delay circuit 208 is multiplied by 1 by the gain adjustment unit L2 of the mixer processing block 206. The C output signal of the signal delay circuit 208 is multiplied by 1 / √2 by the gain adjustment unit L3 of the mixer processing block 206, and then the signals of the gain adjustment units L1, L2, and L3 are added by the adder 212 to be the audio control unit 121. (Or 144) L output signals are obtained.

  Further, the RS output signal of the signal delay circuit 208 is multiplied by 1 / √2 by the gain adjustment unit R5 of the mixer processing block 206, and the R output signal of the signal delay circuit 208 is multiplied by 1 by the gain adjustment unit R4 of the mixer processing block 206. The C output signal of the signal delay circuit 208 is multiplied by 1 / √2 by the gain adjustment unit R3 of the mixer processing block 206, and then the signals of the gain adjustment units R5, R4, and R3 are added by the adder 214 to be the audio control unit 121. (Or 144) R output signals are obtained.

FIG. 13 shows the gains of the gain adjusters L1 to L8, C1 to C8, and R1 to R8 in the voice enhancement mode, the PL2 mode, the pure playback mode, and the PL2 → VS mode when 2ch is input.
In the 2ch input voice emphasis mode, the gain of the gain adjustment unit of the mixer processing block 206 is L2 = 0.25, C2 = 0.5, C4 = 0.5, R4 = 0.25, and all others are 0. It is. At this time, since the gains of the gain adjusting units L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 211 does not pass through the mixer processing block 206.

  Further, the L output signal of the signal delay circuit 210 is input to the gain adjustment unit L2 of the mixer processing block 206, multiplied by 0.25, and then passes through the adder 212 to become the L output signal of the audio control unit 121 (or 144).

  The L output signal of the signal delay circuit 210 is input to the gain adjustment unit C2 of the mixer processing block 206 and multiplied by 0.5, and the R output signal of the signal delay circuit 210 is input to the gain adjustment unit C4 of the mixer processing block 206. Then, the signals of the gain adjusting units C2 and C4 are added by the adder 213 to become the C output signal of the audio control unit 121 (or 144).

  The R output signal of the signal delay circuit 210 is input to the gain adjustment unit R4 of the mixer processing block 206, multiplied by 0.25, and then passes through the adder 214 to become the R output signal of the audio control unit 121 (or 144).

  In the 2ch input PL2 mode, the selection circuit 205 selects the L, C, and R output signals of the PL2 processing block 207 and cuts off the L, C, and R output signals of the VS processing block 202. The gain of the gain adjustment unit of the mixer processing block 206 is L6 = 1, C7 = 1, R8 = 1, and the others are all zero. At this time, since the gains of the gain adjusting units L1 to L5, C1 to C5, and R1 to R5 are all 0, the signal from the signal delay circuit 210 does not pass through the mixer processing block 206.

  Further, since the gain of the gain adjustment unit of the mixer processing block 206 is L6 = 1, C6 = 0, and R6 = 0 with respect to the L output signal output from the signal delay circuit 211, the L output of the PL2 processing block 207 is obtained. The signal passes through the gain adjustment unit L6 (gain 1) of the mixer processing block 206 and the adder 212, and becomes the L output signal of the audio control unit 121 (or 144).

  In addition, since the gain of the gain adjustment unit of the mixer processing block 206 is L7 = 0, C7 = 1, and R7 = 0 with respect to the C output signal output from the signal delay circuit 211, the C output of the PL2 processing block 207 The signal passes through the gain adjustment unit C7 (gain 1) of the mixer processing block 206 and the adder 213, and becomes the C output signal of the audio control unit 121 (or 144).

  Further, since the gain of the gain adjustment unit of the mixer processing block 206 is L8 = 0, C8 = 0, and R8 = 1 with respect to the R output signal output from the signal delay circuit 211, the R output of the PL2 processing block 207 The signal passes through the gain adjustment unit R8 (gain 1) of the mixer processing block 206 and the adder 214, and becomes the R output signal of the audio control unit 121 (or 144).

  In the PL2 mode at the time of 2ch input, by adjusting the configuration of the audio control unit 121 (or 144) in this way, the 2ch L and R input signals input to the audio control unit 121 (or 144) are As the 3.1ch L, R, C, and LFE signals for realizing the sound field of Dolby Surround Pro Logic 2 from the audio control unit 121 (or 144) by the surround processing of Pro Logic 2 by the PL2 processing block 207 Is output.

  In the 2ch input pure playback mode, the gain of the gain adjustment unit of the mixer processing block 206 is L2 = 1, R4 = 1, and the others are all zero. At this time, since the gains of the gain adjusting units L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 211 does not pass through the mixer processing block 206.

  Further, the L output signal output from the signal delay circuit 210 passes through the gain adjustment unit L2 (gain 1) and the adder 212, and becomes the L output signal of the audio control unit 121 (or 144).

  Also, the R output signal output from the signal delay circuit 210 passes through the gain adjustment unit R4 (gain 1) and the adder 214, and becomes the R output signal of the audio control unit 121 (or 144).

  At the time of 2ch input, in the PL2 → VS mode, the selection circuit 205 selects the L, C, R output signals of the VS processing block 202 and cuts off the L, C, R output signals of the PL2 processing block 207. Further, L6 = 1, C7 = 1, R8 = 1, and all others are 0. At this time, since the gains of the gain adjusting units L1 to L5, C1 to C5, and R1 to R5 of the mixer processing block 206 are all 0, the signal from the signal delay circuit 210 does not pass through the mixer processing block 206.

  Further, since L6 = 1, C6 = 0, and R6 = 0 with respect to the L output signal output from the signal delay circuit 211, the L output signal of the VS processing block 202 is the gain adjustment unit L6 of the mixer processing block 206. (Gain 1) passes through the adder 212 and becomes the L output signal of the audio control unit 121 (or 144).

  In addition, since L7 = 0, C7 = 1, and R7 = 0 with respect to the C output signal output from the signal delay circuit 211, the C output signal of the VS processing block 202 is the gain adjustment unit C7 of the mixer processing block 206. (Gain 1) passes through the adder 213 and becomes the C output signal of the audio control unit 121 (or 144).

  Further, since L8 = 0, C8 = 0, and R8 = 1 with respect to the R output signal output from the signal delay circuit 211, the R output signal of the VS processing block 201 becomes the gain adjustment unit R8 of the Mixer processing block 206. (Gain 1) passes through the adder 214 and becomes the R output signal of the audio control unit 121 (or 144).

  In the case of PL2 → VS mode at the time of 2ch input, the configuration of the audio control unit 121 (or 144) is adjusted in this way, whereby the 2ch L and R input signals input to the audio control unit 121 (or 144). However, the surround processing of Pro Logic 2 is performed by the PL2 processing block 207 and input to the VS processing block 202, and further the virtual surround processing is performed by the VS processing block 202, and the 3.1ch of the audio control unit 121 (or 144). Output as virtual surround L, R, C, and LFE signals.

FIG. 14 shows the gains of the gain adjustment units L1 to L8, C1 to C8, and R1 to R8 in the voice enhancement mode, the pure playback mode, and the OFF mode when 1ch is input.
In the 1ch input voice enhancement mode, the gain of the gain adjustment unit of the mixer processing block 206 is L3 = 0.25, C3 = 1, R3 = 0.25, and the others are all zero. At this time, since the gains of the gain adjusting units L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 211 does not pass through the mixer processing block 206.

  Further, the C output signal output from the signal delay circuit 210 passes through the gain adjustment unit L3 of the mixer processing block 206 and is multiplied by 0.25 to be obtained as the L output signal of the audio control unit 121 (or 144).

  Further, the C output signal output from the signal delay circuit 210 is obtained as a C output signal of the audio control unit 121 (or 144) through the gain adjustment unit C3 (gain 1).

  The C output signal output from the signal delay circuit 210 passes through the gain adjustment unit R3 and is multiplied by 0.25 to be obtained as the R output signal of the audio control unit 121 (or 144).

  In the 1ch input pure playback mode, the gain of the gain adjusting unit of the mixer processing block 206 is C3 = 1, and all others are zero. At this time, since the gains of the gain adjusting units L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 211 does not pass through the mixer processing block 206.

  In addition, the C output signal output from the signal delay circuit 210 passes through the gain adjustment unit C3 (gain 1) and becomes the C output signal of the audio control unit 121 (or 144).

  In the 1ch input pure playback mode, the configuration of the audio control unit 121 (or 144) is adjusted in this way, so that the 1ch C input signal input to the audio control unit 121 (or 144) becomes an audio signal. This is the C output signal of the control unit 121 (or 144).

  In the 1ch input OFF mode, the gain of the gain adjustment unit of the mixer processing block 206 is L3 = 1 / √2, R3 = 1 / √2, and the others are all zero. At this time, since the gains of the gain adjusting units L6 to L8, C6 to C8, and R6 to R8 are all 0, the signal from the signal delay circuit 211 does not pass through the mixer processing block 206.

  The C output signal output from the signal delay circuit 210 passes through the gain adjustment unit L3 of the mixer processing block 206 and is multiplied by 1 / √2 to be obtained as the L output signal of the audio control unit 121 (or 144).

  Further, the C output signal output from the signal delay circuit 210 passes through the gain adjustment unit R3 and is multiplied by 1 / √2 to be obtained as the C output signal of the audio control unit 121 (or 144).

Next, control when the sound field mode is switched will be described with reference to FIGS.
FIG. 15 shows an example of switching from the VS mode to the pure playback mode at the time of 5.1ch input. The process of changing the gains of the gain adjusting units L1 to L8, C1 to C8, and R1 to R8 of the mixer processing block 206 is shown. Show. The sound field mode switching processing is executed by the audio control unit 121 or 144. In particular, the sound field change processing unit 192 or 182 executes the gain setting of the gain adjustment units L1 to L8, C1 to C8, and R1 to R8 of the mixer 206.

  FIG. 16 shows an example of switching from the PL2 → VS mode to the pure playback mode at the time of 2ch input. Changes in gains of the gain adjusting units L1 to L8, C1 to C8, and R1 to R8 of the mixer processing block 206 are shown. The process is shown.

  FIG. 17 shows an example of switching from the voice enhancement mode to the pure reproduction mode at the time of 1ch input, and the process of changing the gains of the gain adjustment units L1 to L8, C1 to C8, and R1 to R8 of the Mixer processing block 206 Is shown.

  FIGS. 15 to 17 are examples in which the gains of the gain adjusting units L1 to L8, C1 to C8, and R1 to R8 are changed in four stages. The gain can be gradually changed in stages.

  15 to 17, the gains of the gain adjusters L1 to L8, C1 to C8, and R1 to R8 are linearly changed in four stages (the portion before and after the change is divided into four). This is to change the volume smoothly and continuously, and may be changed in a curved line, and is limited to a linear change. Absent. These interpolation processes are executed by the sound field change processing unit 192 or 182.

  Further, in FIGS. 15 to 17, one example is given for the number of input channels of 5.1 ch, 2 ch, and 1 ch, respectively, but what is indicated by a double arrow in FIGS. 12 to 14 is a mixer processing block It is possible to switch to another sound field mode by similarly changing the gains of 206 gain adjusters L1 to L8, C1 to C8, and R1 to R8.

  However, the switching between the PL2 → VS mode and the PL2 mode at the time of 2ch input indicated by a double-headed arrow in FIG. 13 cannot be switched directly between these. This is because the selector 205 is controlled to switch the output of the PL2 processing block 207 and the output of the VS processing block 202. However, switching between the PL2 → VS mode and the PL2 mode can be indirectly switched via another sound field mode. For example, when “PL2 → VS mode” → “pure playback mode” → “PL2 mode” is switched, the gains of the gain adjusting units L6 to L8, C6 to C8, and R6 to R8 are all passed through the “pure playback mode”. Since it is 0, if the selector 205 is switched when the “pure reproduction mode” is entered, no abnormal noise is generated.

  An example of switching between the VS mode and the pure playback mode at the time of 5.1ch input will be described with reference to FIG.

  Assuming that the VS mode is before switching and the pure playback mode is after switching, the gain adjustment units L1 to L8, C1 to C8, and R1 to R8 of the mixer processing block 206 have the gains L6 = 1 and C7 = 1, R8 = 1, others are 0, and the pure playback mode after switching is that the gains of the gain adjusting units L1 to L8, C1 to C8, and R1 to R8 of the mixer processing block 206 are L1 = 1 / √2, L2. = 1, C3 = 1, R4 = 1, R5 = 1 / √2, and the others are 0.

  The gain at each stage in the transition period ((1) to (3) in FIG. 15) is divided into four stages, and the gain at each stage is linearly interpolated from the gain before change and the gain after change. Ask. For example, regarding the gain adjustment unit L1, L1 = 0 before switching ((0) in FIG. 15) and L1 = 1 / √2 after switching ((4) in FIG. 15), so the first stage (FIG. 15). L1 of (1)) is 1 / √2 * 1/4, L1 of the second stage ((2) of FIG. 15) is 1 / √2 * 2/4, and third stage ((3) of FIG. 15). ) Is 1 / √2 * 3/4, and L1 in the fourth stage of the final switching completion ((4) in FIG. 15) is 1 / √2. In this way, other gains can be obtained by interpolating each stage. These interpolation processes are executed by the sound field change processing unit 192 or 182.

  An example of switching between the PL2 → VS mode and the pure playback mode at the time of 2ch input will be described with reference to FIG.

  If the PL2 → VS mode before switching and the pure playback mode after switching, the gains of the gain adjusting units L1 to L8, C1 to C8 and R1 to R8 of the mixer processing block 206 are L6 = in the PL2 → VS mode before switching. 1, C7 = 1, R8 = 1, others are 0, and the pure playback mode after switching is the gain adjustment units L1 to L8, C1 to C8, R1 to R8 of the mixer processing block 206, the gains are L2 = 1, R4 = 1 and others are 0.

  The gain at each stage in the transition period ((1) to (3) in FIG. 16) is divided into four stages, and the gain at each stage is linearly interpolated from the gain before change and the gain after change. Ask. For example, regarding the gain adjustment unit L2, L2 = 0 before switching ((0) in FIG. 16) and L2 = 1 after switching ((4) in FIG. 16), so the first stage ((1 in FIG. 16). )) L2 is 1/4, L2 in the second stage ((2) in FIG. 16) is 2/4, L2 in the third stage ((3) in FIG. 16) is 3/4, and final switching L2 in the fourth stage of completion ((4) in FIG. 16) is 1. In this way, other gains can be obtained by interpolating each stage.

An example of switching between the voice enhancement mode and the pure reproduction mode at the time of 1ch input will be described with reference to FIG.
If the voice enhancement mode before switching and the pure playback mode after switching, the gain enhancement units L1 to L8, C1 to C8, and R1 to R8 of the mixer processing block 206 have gains of L3 = 0. 25, C3 = 1, R3 = 0.25, and others are 0, and the pure playback mode after switching has gains of the gain adjustment units L1 to L8, C1 to C8, and R1 to R8 of the mixer processing block 206 being C3 = 1 and others are 0.

  The gain at each stage in the transition period ((1) to (3) in FIG. 17) is divided into four stages, and the gain at each stage is linearly interpolated from the gain before change and the gain after change. Ask. For example, for the gain adjustment unit L3, L3 = 0.25 before switching ((0) in FIG. 17) and L3 = 0 after switching ((4) in FIG. 17), so the first stage (FIG. 17). L3 in (1)) is 0.25 * 3/4, L3 in the second stage ((2) in FIG. 17) is 0.25 * 2/4, and L3 in the third stage ((3) in FIG. 17). Is 0.25 * 1/4, and L3 in the fourth stage ((4) in FIG. 17) of final completion of switching is 0. In this way, other gains can be obtained by interpolating each stage. These interpolation processes are executed by the sound field change processing unit 192 or 182.

  As is clear from the above description, switching between each sound field mode is divided into a plurality of stages, and the gain at each stage is interpolated from the gain before change and the gain after change (linear interpolation, curve interpolation). Thus, it can be implemented by obtaining and setting. According to the sound field mode switching of the above embodiment, the volume output from each speaker can be changed smoothly and continuously from before switching to after switching.

  In the above description of the embodiment, each sound field mode realized by the control of the audio control units 121 and 144 is shown in FIG. 9, but the present invention is not limited to this. Moreover, although the example which transmits the number of input channels and the information of a genre through a CEC line was demonstrated, it can also transmit using the TMDS channel of an HDMI cable. In this case, the information may be extracted by the voice decoding unit or the voice demodulating unit at the transmission destination.

  Although the present embodiment has been specifically described above, the present invention is not limited to the above-described embodiment, and can be modified and implemented without departing from the scope of the invention.

  The present invention can be widely used in apparatuses that record / reproduce programs with a television receiver, personal computer, recorder, HDD apparatus, or the like.

It is a figure which shows 1st Embodiment which implement | achieves the audio | voice reproduction apparatus of this invention, the video / audio reproduction apparatus, and the switching method of a sound field mode. It is a figure which shows 2nd Embodiment which implement | achieves the audio | voice reproduction apparatus of this invention, the video / audio reproduction apparatus, and the switching method of a sound field mode. It is a figure which shows 3rd Embodiment which implement | achieves the audio | voice reproduction apparatus of this invention, the video / audio reproduction apparatus, and the switching method of sound field mode. It is a figure explaining the connection of the HDMI cable in the 1st-3rd embodiment of this invention. It is the figure which showed the television receiver, audio equipment, and recorder in the 3rd Embodiment of this invention with the schematic control block. It is the figure which showed the television receiver, audio equipment, and recorder in the 3rd Embodiment of this invention with the detailed control block. It is a figure explaining the flow of a signal in the 3rd Embodiment of this invention. It is a figure explaining the flow of other signals in the 3rd embodiment of the present invention. It is the figure which showed an example of the sound field mode table in embodiment of this invention. It is a figure which shows the processing structure of the audio control part at the time of 5.1ch input by this invention. It is a figure which shows the processing structure of the audio control part at the time of 2ch and 1ch input by this invention. It is a figure which shows each gain of the gain adjustment part of a Mixer processing block at the time of 5.1ch input by this invention. It is a figure which shows each gain of the gain adjustment part of a Mixer process block at the time of 2ch input by this invention. It is a figure which shows each gain of the gain adjustment part of a Mixer processing block at the time of 1ch input by this invention. It is a figure which shows an example of the sound field mode switching at the time of 5.1ch input by this invention. It is a figure which shows an example of the sound field mode switching at the time of 2ch input by this invention. It is a figure which shows an example of the sound field mode switching at the time of 1ch input by this invention.

Explanation of symbols

1 ... TV receiver (video / audio reproduction device, receiving means)
2. Audio equipment (sound playback device, sound playback means)
3-5... Recorder (program recording / reproducing apparatus, video / audio reproducing apparatus, receiving means)
6-9, 25 ... HDMI cables 10-17, 26, 27 ... HDMI terminal 18 ... Optical cable 21 ... HDMI source 22 ... HDMI sink 23 ... HDMI transmitter 24 ... HDMI receiver 28 ... TMDS channels 29165, 169 ... CEC lines 30, 166, 170 ... DDC lines 31, 134, 158 ... EDID-ROM
41-43 ... Host CPU
44... Monitor microcomputer 45, 46... Front microcomputer 47 to 49, 54, 55... Interface circuit 50, 51, 110, 159... HDMI receiving LSI
52, 53, 160, 171... HDMI transmission LSI
104 ... Antenna 105 ... Tuner 106 ... Multiplexing restoration unit 107 ... Video decoding unit 108, 112, 142 ... Selector 109 ... Display unit 111 ... Content information decoding unit 113 ..Digital audio interface modulation unit 114... Light emitting element 115, 156, 172... System controller 116... Remote control light receiving unit 117. Audio decoding unit 121, 144 ... audio control unit 124, 147 ... volume 125-128, 148-151 ... amplifier 129, 152 ... left front speaker 130, 153 ... right front speaker 131, 154 ... Center speaker 132, 155 ... Subwoofer 133, 157 ... Direction interface circuit 140... Light receiving element 141... Digital audio interface demodulator 143... Audio demodulator 161 and 167... TMDS channel 181 ... channel number conversion processor 182. Unit 183 ... enhancement processing unit 184 ... equalizer processing unit 191 ... channel number conversion processing unit 192 ... sound field change processing unit 193 ... enhancement processing unit 194 ... equalizer processing units 201 and 202 ... VS processing block 203 ... BASS processing block 205 ... Selector 206 ... Mixer processing block 207 ... PL2 processing blocks 208-211 ... Signal delay circuits 212-215 ... Adder

Claims (5)

The audio signal that can be output in a plurality of sound field modes, and output from the prologic 2 processing block or the virtual surround processing block in which the virtual surround processing is performed after the prologic 2 processing, is the audio signal of the left channel, the center channel When outputting to the output channel as the audio signal of the right channel audio signal or the right channel audio signal, one of the audio signals output from the prologic 2 processing block or the virtual surround processing block is alternatively selected by the selector In the audio output device configured to adjust the gain by outputting to the same gain adjustment unit ,
When switching the sound field mode between the sound field mode in which the prologic 2 processing block is used and the sound field mode in which the virtual surround processing block is used, between the sound field mode before switching and the sound field mode after switching The value of the gain adjusting unit in the sound field mode before switching is passed from the sound field mode before switching to the other sound field mode through the other sound field mode in which the gain of the gain adjusting unit is 0. Is the initial value, and the gain 0 of the gain adjusting unit in the other sound field mode is interpolated as the final value, and the gain in the other sound field mode is changed from the other sound field mode to the sound field mode after switching. The gain adjustment unit in the transition period is interpolated by setting the gain 0 of the adjustment unit as an initial value and the value of the gain adjustment unit in the sound field mode after switching as a final value. Each gain to be set is set in the gain adjustment unit, and when the gain of the gain adjustment unit reaches 0, an audio signal input to the gain adjustment unit is output from the output of the prologic 2 processing block to the virtual surround. An audio output device comprising sound field change processing means for switching by the selector from the output of the processing block or from the output of the virtual surround processing block to the output of the prologic 2 processing block . The input side of the gain adjustment unit, according to claim 1, characterized in that with a signal delay circuit for adjusting the timing deviation due to the time delay of the virtual surround processing blocks or / and the Pro Logic 2 processing block Voice output device. A video / audio reproduction device comprising the audio output device according to claim 1 . The audio signal that can be output in a plurality of sound field modes, and output from the prologic 2 processing block or the virtual surround processing block in which the virtual surround processing is performed after the prologic 2 processing, is the audio signal of the left channel, the center channel When outputting to the output channel as the audio signal of the right channel audio signal or the right channel audio signal, one of the audio signals output from the prologic 2 processing block or the virtual surround processing block is alternatively selected by the selector In the sound field mode switching method of the audio output device configured to output to the same gain adjusting unit and adjust the gain ,
Switching between the sound field mode in which the prologic 2 processing block is used and the sound field mode in which the virtual surround processing block is used is performed in another sound field mode in which the gain adjustment value of the gain adjustment unit is 0. Through
When going through the other sound field modes,
The gain set in the gain adjustment unit in the sound field mode before switching is set as an initial value,
The gain 0 set in the gain adjustment unit in the other sound field mode that passes through is set as an intermediate value,
The gain set in the gain adjustment unit in the sound field mode after switching is the final value,
Each gain to be set in the gain adjustment unit in the transition period is obtained by interpolating from the initial value and the intermediate value from the initial value to the intermediate value, and from the intermediate value to the final value , Obtained by interpolation from the final value, set in the gain adjustment unit ,
The audio signal input to the gain adjustment unit when the gain set in the gain adjustment unit reaches the intermediate value 0 is transmitted from the output of the prologic 2 processing block by the selector to the virtual surround processing block. A sound field mode switching method characterized by switching to output or from the output of the virtual surround processing block to the output of the prologic 2 processing block . 5. The sound field mode switching method according to claim 4 , wherein a timing shift caused by a time delay of the virtual surround processing block or / and the prologic 2 processing block is adjusted.

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