JP2007208709A - Sound reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound reproducing apparatus capable of easily reproducing proper sounds, based on the digital sound data of multichannel. <P>SOLUTION: The sound reproducer 1 downmixes digital sound data Din of multichannel, which are inputted into stereo sound signal So or surround sound signal St by using a 2-channel decoder 12, which are inputted in a surround decoder 13. When the surround decoder 13 converts it into sound signal for stereo sound reproduction or that for surround sound reproduction, setting of downmix of the 2-channel decoder 12 is switched, according to conversion at the surround decoder 13, or presence/absence of surround setting of the surround decoder 13 is switched, according to conversion at the 2-channel decoder 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an audio reproducing apparatus that performs audio reproduction from a plurality of speakers.

  Conventionally, multi-channel digital audio data read from a storage medium such as a DVD (Digital Versatile Disk) is decoded, and the digital audio data is downmixed to two channels according to an output terminal or the like. There is an audio reproduction device that performs surround reproduction or normal stereo reproduction from a plurality of speakers in accordance with presence / absence of surround setting based on channel audio signals.

  Multi-channel digital audio data read from a DVD includes the listener's front, right front, left front, surround signal, and the listener's front, right front, left front, right rear, left rear, bass output The 5.1 channel signal including the audio signal. In addition, the downmixed two-channel audio signal is listened to by the Lo (Left Only) and Ro (Right Only) audio signals for stereo reproduction by the left and right speakers and the matrix encoding process. Lt (Left Total, which is a sound signal that has a front, right front, left front, surround signal, and can reproduce a realistic sound field from a plurality of speakers arranged in front, right left front, right left rear, etc. ) And Rt (Right Total).

Japanese Patent Application Laid-Open No. 2004-228561 describes a technique for performing control so that surround processing is performed based on table data set in advance or table data set by a user in a multichannel audio apparatus.
JP 2004-274374 A

  However, in the above-described conventional audio reproduction device, in order to perform more preferable audio reproduction, a user inputs an audio signal that is downmixed and output according to the validity / invalidity of the surround decoder to Lo / Ro or Lt / Rt in advance. It was necessary to set and was inconvenient.

  An object of the present invention has been made in view of the above-described problems of the prior art, and is to provide an audio reproducing apparatus that easily performs good audio reproduction based on multi-channel digital audio data.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an audio reproducing apparatus for reproducing audio from a plurality of speakers, wherein digital audio data in which multi-channel audio data is compressed is decoded, Two-channel output means for outputting a sound signal for sound reproduction or a sound signal for surround sound reproduction in two channels from the multi-channel sound data, and the plurality of speakers based on the sound signals output in the two channels Conversion means for converting the sound output signal for performing sound reproduction from or into the sound output signal for performing surround sound reproduction from the plurality of speakers, and the control means for controlling the two-channel output means and the conversion means. And the control means includes a sound for reproducing sound from the plurality of speakers in the conversion means. Output of an audio signal for audio reproduction or an audio signal for surround audio reproduction in the two-channel output means according to conversion to an output signal or conversion to an audio output signal for performing surround audio reproduction from the plurality of speakers It is characterized by switching.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control unit converts the second unit into the audio output signal for audio reproduction from the plurality of speakers in the conversion unit. The output in the channel output means is switched to an audio signal for audio reproduction.

  According to a third aspect of the present invention, in the first aspect of the present invention, the control means converts the sound from the plurality of speakers into an audio output signal for performing surround sound reproduction. The output from the two-channel output means is switched to a sound signal for surround sound reproduction.

  According to a fourth aspect of the present invention, in an audio reproducing apparatus for reproducing audio from a plurality of speakers, digital audio data in which input multi-channel audio data is compressed is decoded and audio is generated from the multi-channel audio data. Two-channel output means for outputting a sound signal for reproduction or a sound signal for surround sound reproduction in two channels, and sound for performing sound reproduction from the plurality of speakers based on the sound signal output in the two channels A conversion means for converting an output signal or an audio output signal for performing surround sound reproduction from the plurality of speakers; and a control means for controlling the two-channel output means and the conversion means. Output of audio signal for audio reproduction or audio signal for surround sound reproduction in 2-channel output means According to the above, the conversion means switches the conversion to an audio output signal for audio reproduction from the plurality of speakers or the conversion to an audio output signal for surround sound reproduction from the plurality of speakers. To do.

  According to a fifth aspect of the present invention, in an audio reproduction apparatus that reproduces audio from a plurality of speakers, digital audio data in which input multichannel audio data is compressed is decoded, and audio is generated from the multichannel audio data. Two-channel output means for outputting a sound signal for reproduction or a sound signal for surround sound reproduction in two channels, and sound for performing sound reproduction from the plurality of speakers based on the sound signal output in the two channels Conversion means for converting an output signal or an audio output signal for performing surround sound reproduction from the plurality of speakers; and determination means for determining a conversion state in the conversion means; and the two-channel output means includes the determination Depending on the determination result in the means, the audio signal for audio reproduction or the audio signal for surround audio reproduction Characterized in that for switching the output of.

  The invention according to claim 6 is the invention according to claim 5, wherein the two-channel output means converts the determination result in the determination means into an audio output signal for audio reproduction from the plurality of speakers. In some cases, the output from the two-channel output means is switched to an audio signal for audio reproduction.

  According to the present invention, good sound reproduction based on multi-channel digital sound data can be easily performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. The embodiments of the present invention show the most preferable modes of the invention, and the uses and terms of the invention are not limited thereto.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram schematically showing a functional configuration of an audio reproduction device 1 according to the first embodiment of the present invention. FIG. 2A is a flowchart showing an operation of the audio reproduction device 1. FIG. 2B is a diagram illustrating a display screen G1 displayed on the display unit 143 when surround is set, and FIG. 3A is an operation of the audio reproduction device 1 according to the first embodiment. FIG. 3B is a diagram illustrating a display screen G2 displayed on the display unit 143 when setting the downmix.

  As shown in FIG. 1, the audio reproducing apparatus 1 outputs a multi-channel digital audio data Din output from the DVD reproducing apparatus 11 as a 2-channel stereo audio signal So or a surround audio signal St. The surround decoder 13 for outputting the audio output signals S1 to S4 for reproducing the sound by the speakers SP1 to SP4 based on the stereo audio signal So or the surround audio signal St, and the two-channel decoder 12 and the surround decoder 13 are controlled. It is the structure provided with the control apparatus 14 to perform.

  The DVD playback device 11 has an optical pickup and the like, reads digital audio data recorded on an audio track of a storage medium such as a DVD-R, DVD-R / W, DVD + R / W, DVD-RAM, etc. Output as data Din. The digital audio data Din is multichannel digital audio data such as a 5.1 channel audio signal compressed in a predetermined format such as DOLBY (registered trademark) or dts (registered trademark). In the following description, for the sake of convenience, it is assumed that the channel of the digital audio data output as the digital audio data Din relates to the audio signals of the listener's right front, left front, front, and rear (surround).

  Note that the DVD playback device 11 reads out an audio file obtained by compressing and encoding multi-channel audio data in a predetermined format (for example, MP3 format, WMA format, AAC format, or ATRAC3 format) from the storage medium, and outputs the digital audio data. It may be configured to output as Din. The storage medium may be a CD-DA type compact disc (so-called music CD) or a CD-ROM type compact disc (so-called data CD), and is not particularly limited.

  The two-channel decoder 12 is a DSP (Digital Signal Processor) for data conversion, and includes a decoding unit 121, a downmix unit 122, and an I / F unit 123. The decoding unit 121 is a PCM (Pulse Code Modulations) audio signal or the like obtained by decoding (expanding) the digital audio data Din output from the DVD playback device 11, and includes the right front digital audio signal D1 and the left front audio signal D1. Digital audio data Dout including the digital audio signal D 2, the front digital audio signal D 2, and the rear (surround) digital audio signal D 4 is generated and output to the downmix unit 122.

  Based on the input digital audio data Dout, the downmix unit 122 performs 2-channel stereo audio signal So (Lo: Left) for audio reproduction (stereo audio reproduction) with a left and right speaker for the listener. (Only / Ro: Right Only) or 2-channel surround sound signal St (Lt: Left Total / Rt: Right Total) mixed so as to be decoded into the components of the digital audio signals D1 to D4 described above by a known matrix encoding process or the like Is output to the surround decoder 13 in accordance with an input instruction. The stereo sound signal So may be the same sound reproduction (monaural sound reproduction) in the left-right direction in addition to the stereo sound reproduction, and is not particularly limited.

  The I / F unit 123 relays the notification of the state of the 2-channel decoder 12 and the notification of the setting instruction to the 2-channel decoder 12 with the control device 14 connected via a communication cable (not shown). Specifically, the I / F unit 123 receives an instruction from the control device 14 to the downmix unit 122 and outputs the instruction to the downmix unit 122.

  In the 2-channel decoder 12, the digital audio data Din is input from the DVD playback device 11, the digital audio data Dout decoded by the decoding unit 121 is input to the downmix unit 122, and an instruction input from the control device 14 is received. The downmix unit 122 outputs the stereo sound signal So or the surround sound signal St downmixed accordingly.

  The surround decoder 13 is an IC or an amplifier circuit that functions as a surround decoder, and includes a conversion unit 131 and an I / F unit 132. The converter 131 receives the stereo sound signal So or the surround sound signal St output from the two-channel decoder 12, converts the sound according to the presence / absence of the surround setting, and then converts the amplified sound output signals S1 to S4 to the speakers SP1 to SP1. Output to SP4. In the conversion unit 131, the conversion when the surround setting is valid is performed by performing decoding processing corresponding to the above-described matrix encoding processing or the like on a signal input in two channels and converting the signal into audio output signals S1 to S4. Yes, the conversion when the surround setting is invalid is to simply output a signal input in two channels to the audio output signals S1 to S4 corresponding to the channel.

  The I / F unit 132 relays the notification of the status of the surround decoder 13 and the notification of the setting instruction to the surround decoder 13 with the control device 14 connected via a communication cable (not shown). Specifically, the I / F unit 132 receives an instruction or the like from the control device 14 to the conversion unit 131 and outputs the instruction to the conversion unit 131, the surround setting instruction to the conversion unit 131, and the setting state of the conversion unit 131. Make notifications.

  In the surround decoder 13, the stereo audio signal So or the surround audio signal St is input from the 2-channel decoder 12 to the converter 131, and the audio output signal S 1 converted according to the presence or absence of the surround setting input from the control device 14. To S4 are output from the conversion unit 131 to the speakers SP1 to SP4. The speakers SP1 to SP4 perform sound reproduction based on the sound output signals S1 to S4. For this reason, in the surround decoder 13, when the surround setting is valid and the input signal is the surround sound signal St, the sound output signals S1 to S4 corresponding to the digital sound signals D1 to D4 are the speakers SP1. By outputting to ~ SP4, faithful sound field reproduction (surround reproduction) can be performed. Further, when the surround setting is invalid and the input signal is the stereo sound signal So, faithful stereo reproduction can be performed without performing extra conversion processing.

  The control device 14 includes a control unit 141, an operation unit 142, a display unit 143, a storage unit 144, and an I / F unit 145.

  The control unit 141 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like (not shown). The CPU stores a predetermined area of the RAM in the ROM or the storage unit 144 in advance as a work area. Various stored control programs are executed to control each unit in the control device 14. The control unit 141 controls the 2-channel decoder 12 and the surround decoder 13 by transmitting and receiving signals to and from the 2-channel decoder 12 or the surround decoder 13 via the I / F unit 145. Although not particularly shown, the I / F unit 145 and the DVD playback device 11 are electrically connected, and the control unit 141 performs playback control (playback, pause, stop, etc. of a predetermined track) in the DVD playback device 11. It may be a configuration.

  The operation unit 142 includes adjustment knobs such as various input keys and a volume controller, and outputs operation signals corresponding to operations of these input keys and adjustment knobs to the control unit 141.

  The display unit 143 includes an LCD (Liquid Crystal Display) panel, an FPD (Flat Panel Display) using an organic EL (Electro Luminescence) element, an LED (Light Emitting Diode), and the like. , Information on the operation status such as track number and volume, and various setting statuses of the 2-channel decoder 12 and the surround decoder 13 are displayed. The display unit 143 may be configured to form a touch panel integrally with the operation unit 142.

  The storage unit 144 is a nonvolatile memory in which data can be electrically rewritten, and stores various setting information, a control program executed by the control unit 141, and the like. The various setting information stored in the storage unit 144 includes, for example, a setting as to whether the output from the two-channel decoder 12 is performed using the stereo sound signal So or the surround sound signal St, and whether or not the surround decoder 13 performs surround reproduction. Settings, audio volume values, etc.

  Here, an operation performed by the control unit 141 will be described. As shown in FIG. 2A, the control unit 141 acquires an instruction for presence / absence of surround setting from the operation unit 142 (step A11), and determines whether to enable the surround setting based on the acquired instruction. Is determined (step A12).

  As shown in FIG. 2 (b), regarding the instruction of presence / absence of surround setting acquired from the operation unit 142, a setting button G11 for setting the presence / absence on the display screen G1 related to the surround setting displayed on the display unit 143, This is done by displaying G12 and accepting a selection instruction.

  If it is determined in step A12 that the surround setting is valid, the downmix setting in the two-channel decoder 12 is set so as to output the surround sound signal St (Lt / Rt) (step A13). The surround setting in is enabled (step A14), and the process ends.

  Conversely, if it is determined in step A12 that the surround setting is invalidated, the downmix setting in the two-channel decoder 12 is set to output the stereo audio signal So (Lo / Ro) (step A15). The surround setting in the surround decoder 13 is invalidated (step A16), and the process ends.

  As described above, the audio reproduction device 1 surrounds the multi-channel digital audio data Din input from the DVD reproduction device 11 or the like with the 2-channel decoder 12 by down-mixing it into the stereo audio signal So or the surround audio signal St. When the sound is input to the decoder 13 and converted into a sound signal for performing sound reproduction (stereo) or a sound signal for performing surround sound reproduction by the surround decoder 13 and output to the speakers SP1 to SP4 to perform sound reproduction. In this configuration, the downmix setting in the two-channel decoder 12 is switched in accordance with the conversion in the surround decoder 13. For this reason, since the audio reproduction device 1 can perform the downmix setting in accordance with the presence / absence of the surround setting, the audio reproduction can be performed well when performing audio reproduction from a plurality of speakers based on multi-channel digital audio data. In addition, it is possible to save troublesome settings.

  In addition, the audio playback device 1 uses the down-channel in the two-channel decoder 12 when the surround setting is invalidated in the surround decoder 13 based on an instruction input from the operation unit 142, that is, when normal playback (stereo playback) is performed. When the mix is switched to the normal reproduction stereo audio signal So and surround reproduction is set in the surround decoder 13, the downmix in the two-channel decoder 12 is switched to the surround audio signal St for surround audio reproduction. For this reason, the audio reproduction device 1 can perform downmix suitable for surround reproduction or normal reproduction, and can perform better audio reproduction.

[Modification]
Here, a modified example of the operation performed by the control unit 141 according to the first embodiment will be described with reference to FIG. Since the apparatus configuration is the same as described above, the description thereof is omitted, and only the operation performed by the control unit 141 is described.

  As shown in FIG. 3A, the control unit 141 acquires the downmix setting in the 2-channel decoder 12 from the operation unit 142 (step A21), and sets the downmix setting based on the acquired instruction as surround sound. It is determined whether or not to use the output of the signal St (Lt / Rt) (step A22).

  As for the downmix setting instruction acquired from the operation unit 142, as shown in FIG. 3B, the stereo sound signal So or the surround sound signal is displayed on the display screen G2 related to the downmix setting displayed on the display unit 143. This is performed by displaying setting buttons G21 and G22 for selecting which of the signals St to be output and receiving a selection instruction.

  When it is determined in step A22 that the surround sound signal St (Lt / Rt) is to be output, the downmix setting in the 2-channel decoder 12 is set to output the surround sound signal St (step A23). The surround setting in the surround decoder 13 is validated (step A24), and the process ends.

  Conversely, if it is determined in step A22 that the output is not the surround sound signal St (Lt / Rt), that is, if it is determined to be the stereo sound signal So (Lo / Ro), the two-channel decoder 12 The downmix setting is set so as to output the stereo audio signal So (step A25), the surround setting in the surround decoder 13 is invalidated (step A26), and the process is terminated.

  As described above, the audio reproduction device 1 surrounds the multi-channel digital audio data Din input from the DVD reproduction device 11 or the like with the 2-channel decoder 12 by down-mixing it into the stereo audio signal So or the surround audio signal St. When input to the decoder 13 and converted to an audio signal for audio reproduction (stereo reproduction) or an audio signal for surround audio reproduction by the surround decoder 13 and output to the speakers SP1 to SP4 for audio reproduction Further, according to the conversion in the 2-channel decoder 12, the presence / absence of the surround setting in the surround decoder 13 is switched. For this reason, since the audio reproduction device 1 can set the presence / absence of the surround setting in accordance with the downmix setting, the audio reproduction can be performed well when audio is reproduced from a plurality of speakers based on multi-channel digital audio data. As well as troublesome settings.

  In addition, the audio reproduction device 1 switches the surround setting in the surround decoder 13 to invalid when the down-mixing in the 2-channel decoder 12 is performed with the stereo audio signal So based on the instruction input from the operation unit 142. When downmixing in the decoder 12 is performed with the surround sound signal St, the surround setting in the surround decoder 13 is effectively switched. For this reason, the audio reproduction device 1 can set the presence / absence of surround reproduction so as to be suitably reproduced according to the downmix, and can perform better audio reproduction.

[Second Embodiment]
Next, as a second embodiment, an embodiment in which the surround decoder 13 of the audio playback device 1 includes a surround determination unit 133 will be described with reference to FIGS. 4 and 5. FIG. 4 is a block diagram schematically showing a functional configuration of the audio reproduction device 1a according to the second embodiment of the present invention. FIG. 5 shows a downmix unit based on the determination of the surround determination unit 133. 12 is a flowchart showing the operation of the audio reproduction device 1a for setting 122. For simplification, the same components as those of the audio reproducing device 1 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, the audio playback device 1 a determines the presence / absence of surround setting in the conversion unit 131 and outputs the result to the I / F unit 132 in the surround decoder 13 of the audio playback device 1 described above. It is the structure which has the part 133. FIG. The result output by the surround determination unit 133 specifies the downmix to the stereo audio signal So or the surround audio signal St in the downmix unit 122 according to the presence / absence of the surround setting of the conversion unit 131.

  As illustrated in FIG. 5, the surround determination unit 133 acquires the state of the conversion unit 131 (step B11), and determines that the surround setting of the conversion unit 131 is valid (step B12: Y), the downmix unit When the output at 122 is set to be the surround sound signal St and it is determined that the surround setting of the conversion unit 131 is invalid (step B12: N), the output at the downmix unit 122 is converted to the stereo sound signal So. Set to The output of the surround determination unit 133 is transmitted to the downmix unit 122 via the I / F unit 132, the I / F unit 145, and the I / F unit 123. The downmix unit 122 sets the downmix to the stereo sound signal So or the surround sound signal St according to the output of the surround determination unit 133.

  As described above, the audio reproducing device 1a surrounds the multi-channel digital audio data Din input from the DVD reproducing device 11 or the like by down-mixing the stereo audio signal So or the surround audio signal St with the 2-channel decoder 12. When input to the decoder 13 and converted to an audio signal for audio reproduction (stereo reproduction) or an audio signal for surround audio reproduction by the surround decoder 13 and output to the speakers SP1 to SP4 for audio reproduction Furthermore, the configuration is such that the downmix setting in the two-channel decoder 12 is switched according to the presence or absence of the surround setting determined by the surround determination unit 133. For this reason, since the audio reproduction device 1 can perform the downmix setting in accordance with the setting state of the surround decoder 13, it is preferable when performing audio reproduction from a plurality of speakers based on multichannel digital audio data. The voice can be reproduced and the troublesome setting can be saved.

  Also, the audio playback device 1a performs the downmix in the 2-channel decoder 12 on the stereo audio signal when the surround setting is invalid in the surround decoder 13, based on the determination of the surround determination unit 133, that is, when normal playback is performed. When the surround playback is valid in the surround decoder 13, the downmix in the 2-channel decoder 12 is switched to the surround audio signal St. For this reason, the audio reproduction device 1a can perform downmix suitable for surround reproduction or normal reproduction, and can perform better audio reproduction.

  Note that the description in the present embodiment shows an example of the present invention, and the present invention is not limited to this. The configuration and operation of the audio reproduction device 1 in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

  For example, the multi-channel digital audio data input to the 2-channel decoder 12 is exemplified as the configuration of the digital audio data Din output from the DVD playback device 11. For example, the multi-channel digital audio data is output from a tuner capable of receiving terrestrial digital broadcasting. However, the source is not limited to the DVD playback device 11 that reads and outputs the multi-channel digital audio data stored in a storage medium such as a DVD.

It is the block diagram which showed typically the functional structure of the audio | voice reproduction apparatus 1 which is the 1st Embodiment of this invention. . (A) is a flowchart which shows operation | movement of the audio | voice reproduction apparatus 1, (b) is a figure which illustrates the display screen G1 displayed on the display part 143 at the time of surround setting. (A) is a flowchart which shows the modification of the operation | movement of the audio | voice reproduction apparatus 1 in 1st Embodiment, (b) is a figure which illustrates the display screen G2 displayed on the display part 143 at the time of downmix setting. It is. It is the block diagram which showed typically the functional structure of the audio | voice reproduction apparatus 1a which is the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the audio | voice reproduction apparatus 1a which sets the downmix part 122 based on the determination of the surround determination part 133. FIG.

Explanation of symbols

1, 1a Audio playback device 11 DVD playback device 12 2-channel decoder (2-channel output means)
13 Surround decoder (conversion means)
14 Control device (control means)
121 Decoding unit 122 Downmix unit 123 I / F unit 131 Conversion unit 132 I / F unit 133 Surround determination unit (determination means)
141 Control Unit 142 Operation Unit (Instruction Unit)
143 Display unit 144 Storage unit 145 I / F unit SP1-SP4 Speaker Din Digital audio data Dout Digital audio data D1-D4 Digital audio signal So Audio signal St Surround audio signals S1-S4 Audio output signals G1, G2 Display screen G11 , G12, G21, G22 Setting buttons

Claims (6)

In an audio playback apparatus that performs audio playback from a plurality of speakers,
2-channel output that decodes digital audio data in which input multi-channel audio data is compressed, and outputs an audio signal for audio reproduction or an audio signal for surround audio reproduction in two channels from the multi-channel audio data Means,
Conversion means for converting into audio output signals for performing audio reproduction from the plurality of speakers or audio output signals for performing surround audio reproduction from the plurality of speakers based on the audio signals output in the two channels;
Control means for controlling the two-channel output means and the conversion means,
The control means includes
According to the conversion to the audio output signal for performing audio reproduction from the plurality of speakers or the conversion to the audio output signal for performing surround audio reproduction from the plurality of speakers in the conversion unit, in the two-channel output unit An audio reproduction apparatus that switches an output of an audio signal for audio reproduction or an audio signal for surround sound reproduction.   The control means switches the output from the two-channel output means to an audio signal for audio reproduction when converting the audio from the plurality of speakers into an audio output signal for audio reproduction. The sound reproducing device according to claim 1.   The control means switches the output from the two-channel output means to an audio signal for surround sound reproduction when converting the plurality of speakers into an audio output signal for performing surround sound reproduction in the conversion means. The sound reproducing apparatus according to claim 1, wherein In an audio playback apparatus that performs audio playback from a plurality of speakers,
2-channel output that decodes digital audio data in which input multi-channel audio data is compressed, and outputs an audio signal for audio reproduction or an audio signal for surround audio reproduction in two channels from the multi-channel audio data Means,
Conversion means for converting into audio output signals for performing audio reproduction from the plurality of speakers or audio output signals for performing surround audio reproduction from the plurality of speakers based on the audio signals output in the two channels;
Control means for controlling the two-channel output means and the conversion means,
The control means includes
In accordance with the output of the audio signal for audio reproduction or the audio signal for surround audio reproduction in the two-channel output means, the conversion means converts the audio signals to audio output signals for audio reproduction from the plurality of speakers or the plurality of audio signals. A sound reproducing apparatus that switches the conversion from a speaker to an audio output signal for performing surround sound reproduction. In an audio playback apparatus that performs audio playback from a plurality of speakers,
2-channel output that decodes digital audio data in which input multi-channel audio data is compressed, and outputs an audio signal for audio reproduction or an audio signal for surround audio reproduction in two channels from the multi-channel audio data Means,
Conversion means for converting into audio output signals for performing audio reproduction from the plurality of speakers or audio output signals for performing surround audio reproduction from the plurality of speakers based on the audio signals output in the two channels;
Determination means for determining a conversion state in the conversion means,
The two-channel output means switches an output of an audio signal for audio reproduction or an audio signal for surround sound reproduction in accordance with a determination result in the determination means.   The two-channel output means converts the output from the two-channel output means into an audio signal for audio reproduction when the determination result in the determination means is conversion into an audio output signal for audio reproduction from the plurality of speakers. The sound reproducing device according to claim 5, wherein the sound reproducing device is switched to.

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