JP4385710B2 - Audio signal processing apparatus and audio signal processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which speaking-speed conversion is performed double when speaking-speed conversion processing is performed even on a transmission side depending upon a broadcast program in addition to a speaking-speed converting function on a reception side. <P>SOLUTION: A transmission device 1 packetizes and multiplexes a voice signal and also multiplexes and transmits speaking-speed conversion completion information indicating whether speaking-speed conversion of each voice signal is already performed on the transmission side or at a sound source before it as information attached to the voice signal. A voice signal processing apparatus 10A detects the speaking-speed conversion completion information in a received multiplexed signal by a speaking-speed conversion information detection part 13. A speaking-speed conversion processing part 14 decides whether speaking-speed conversion of a selected voice signal of a selected program after decoding which is outputted from a voice signal decoder 12 is already performed before the transmission, and turns off speaking-speed conversion processing operation when the speaking-speed conversion is already performed before the transmission to prevent speaking-speed conversion from being performed on both the transmission side and reception side in duplication, and performs speaking-speed conversion processing when the speaking-speed conversion is not performed before the transmission. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to an audio signal processing apparatus and an audio signal processing method, and more particularly to an audio signal processing apparatus and an audio signal processing method having a so-called speech speed conversion function that makes it easier for elderly people to hear audio.

  In general, it has been found that in elderly people, it is more difficult to listen to the content from fast-speaking voice than when young. For this reason, instead of finding a part where the utterance is interrupted from the input audio signal and reducing the time of this period, the voice during the utterance period is stretched on the time axis without changing the pitch, and the overall utterance is slow. An audio signal processing device and an audio signal processing method having a so-called speech speed conversion function for converting to an audio signal have been conventionally known (see, for example, Patent Document 1).

  In the audio signal processing device described in Patent Document 1, speech speed control information for controlling the speech speed is previously inserted in transmission data, recording media, etc., and a playback device or recording media for receiving and reproducing the transmission data is used. In the playback device, the speech speed is controlled based on the speech speed control information. A radio equipped with a speech speed conversion function has also been developed (see, for example, Non-Patent Document 1).

JP-A-8-146985 Imai, Tsuzuki, Hasuda, Takeishi: "Development of radio with listening assistance function", IEICE, IEICE Technical Report TL2003-7, June 2003

  By the way, this kind of speech speed conversion technology has been studied energetically by broadcasters. In the future, audio signals for television broadcasting and radio signals for which speech speed conversion processing has been performed on the transmission side will be transmitted. However, it is conceivable to facilitate the viewing of elderly people. For this reason, in addition to the speech speed conversion function on the receiving side, if the transmission speed conversion processing is also performed on the transmission side for some programs in broadcasting, etc., it may happen that the speech speed conversion is doubled. become.

  In that case, the speech signal that has already undergone the speech speed conversion is further subjected to the speech speed conversion, resulting in a sound that is slower than necessary, which is rather difficult to hear. In this regard, with conventional receivers, the user only has to manually turn off the speech speed conversion function. A point is considered. In addition, it is difficult for an elderly person to switch this in actual use.

  The present invention has been made in view of the above points, and automatically uses the information associated with the broadcast audio signal to automatically convert the speech speed conversion between the transmitting side and the receiving side. An object of the present invention is to provide an audio signal processing apparatus and an audio signal processing method that can be prevented.

  Another object of the present invention is to provide an audio signal processing apparatus and an audio signal processing method that can eliminate the need for switching operation of whether or not speech speed conversion is performed according to a program to be received.

  In order to achieve the above object, the speech signal processing apparatus of the first invention is subjected to speech speed conversion processing for changing the time axis without changing the speech pitch on the transmission side for the speech signal and the speech signal. Receiving means for receiving a multiplexed signal in which accompanying information related to speech speed conversion indicating whether or not there is multiplexed, and detecting the accompanying information related to speech speed conversion from the multiplexed signal received by the receiving means, and determining the contents The content of the accompanying information related to speech speed conversion detected by the detection means has already been subjected to speech speed conversion on the transmission side. If it is determined that the voice signal reproduced by the reproduction means is not subjected to the speech speed conversion process, it is determined that the content of the accompanying information regarding the speech speed conversion is not subjected to the speech speed conversion on the transmission side. In case It is obtained by a structure having a speech speed conversion processing means for performing speech speed conversion processing of the audio signal reproduced by the reproducing means.

  In the present invention, an audio signal transmitted from the transmission side and accompanying information related to speech speed conversion are received, and whether or not speech speed conversion processing of the reproduced audio signal is performed based on the accompanying information related to speech speed conversion is automatically performed. Can be determined automatically.

In order to achieve the above object, an audio signal processing device according to a second aspect of the present invention provides an audio signal and a speech speed that are not subjected to speech speed conversion processing for changing the time axis without changing the audio pitch on the transmission side. A plurality of audio signals including the audio signal subjected to the conversion processing, speech speed converted information indicating whether each of the plurality of audio signals is an audio signal subjected to the speech speed conversion processing, and the speech speed Receiving means for receiving a multiplexed signal in which corresponding speech speed speech information indicating whether or not there is a speech signal that has been subjected to speech speed conversion processing corresponding to a speech signal that has not been subjected to conversion processing ; Detection means for detecting speech speed converted information and corresponding speech speed converted voice information from the multiplexed signal received by the receiving means, and determining the contents thereof, and a plurality of voice signals from the multiplexed signal received by the receiving means to select and play one of the Raw unit, a speech speed conversion processing means for performing speech speed conversion process on the audio signal, characterized by a control unit. Here, when the reproducing unit selects and reproduces one of the plurality of audio signals by the reproducing unit, the selected audio signal is an audio signal that has been subjected to speech speed conversion processing by the detecting unit. If it is determined that there is, the speech speed conversion processing means is turned off and the speech speed conversion process is not performed on the selected audio signal, and one of the plurality of audio signals is selected and reproduced by the reproduction means. When it is determined that the selected speech signal is a speech signal that has not been subjected to speech speed conversion processing by the detecting means, and a speech signal that has been subjected to the corresponding speech speed conversion processing exists. Instead of the selected voice signal, the voice signal is switched to the corresponding voice speed conversion process, the voice speed conversion processing means is turned off and the voice speed conversion process is not performed on the switched voice signal. Multiple audio signals When any one of them is played back, the selected audio signal is an audio signal that has not been subjected to speech speed conversion processing by the detecting means, and an audio signal that has been subjected to the corresponding speech speed conversion processing. When it is determined that there is no voice rate, the speech speed conversion processing means is turned on and control is performed to perform the speech speed conversion process on the selected speech signal .

In order to achieve the above object, the speech signal processing method of the third invention performs speech speed conversion processing for changing the time axis without changing the speech pitch on the transmission side with respect to the speech signal. A first step of receiving a multiplexed signal multiplexed with accompanying information related to speech rate conversion indicating whether or not the speech rate conversion is performed, and detecting the accompanying information related to speech rate conversion from the received multiplexed signal, The second step of determining, the third step of reproducing the audio signal from the received multiplexed signal, and the content of the accompanying information related to the speech speed conversion detected by the second step are the speech speed conversion on the transmission side. If it is determined that the speech rate has not been applied, the transmitting side transmits the fourth step for performing the speech speed conversion processing of the reproduced audio signal and the content of the accompanying information regarding the speech speed conversion detected in the second step. Already speaking speed conversion When it is determined to be performed it is characterized in that it comprises a fifth step of outputting without speech rate conversion of the reproduced audio signal.

  In the present invention, an audio signal transmitted from the transmission side and accompanying information related to speech speed conversion are received, and whether or not speech speed conversion processing of the reproduced audio signal is performed based on the accompanying information related to speech speed conversion is automatically performed. Can be determined automatically.

  According to the present invention, whether the speech signal transmitted from the transmission side and the accompanying information related to speech speed conversion are received, and the speech speed conversion processing of the reproduced speech signal is performed based on the accompanying information related to speech speed conversion. Therefore, even if the user of the audio signal processing device on the receiving side does not switch each time, the speech speed conversion of the received audio signal can always be heard with the optimum setting.

  In addition, according to the present invention, since the speech speed conversion process is not performed on the received speech signal that has been subjected to the speech speed conversion, it is not necessary to switch the speech speed every time the user selects and receives a channel. It is possible to automatically prevent speech speed conversion from being performed twice on the transmission side and the reception side.

  Further, according to the present invention, since the speech signal that has been subjected to speech speed conversion transmitted from the transmission device is used as much as possible, when speech speed conversion is performed by the speech signal processing device on the receiving side, It is possible to avoid as much as possible the phenomenon that the speech speed conversion itself does not work because there is no break, and the power consumption of the audio signal processing device can be reduced.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. The audio signal processing apparatus and audio signal processing method according to the present invention controls on / off of the speech speed conversion function using information accompanying the audio signal on the broadcast side. It is. Several possible embodiments are described below.

  FIG. 1 shows a block diagram of a first embodiment of an audio signal processing apparatus according to the present invention. In FIG. 1, an audio signal processing device 10A according to the first embodiment is connected to a transmission device 1 via a transmission path 3, and a large number of audio signals transmitted from the transmission device 1 are packet-multiplexed. The received signal is received via the transmission line 3, and a desired voice signal is selectively received from the received signal and decoded to obtain a voice output, and has a speech speed conversion function for the voice output.

  Here, the transmitting apparatus 1 packetizes each voice signal (the first to fifth voice signals are shown in FIG. 1) into voice packets in the packetizing unit 2, and then sends each voice packet. In addition to the packet ID (PID) for identifying the included packet, the packet is transmitted in addition to the audio packet, and the packet of control information / program information is transmitted. As a kind of the control information / program information, for example, a program association table (PAT: Program Association Table) defined in MPEG (Moving Picture Experts Group) can be used so that a desired audio signal can be selected on the receiving side. ) And a program map table (PMT: Program Map Table).

  In a PAT having a specific PID, information on the PMT of a PMT that transmits information on video and audio packets constituting the program is sent, and the PID of the video and audio packets constituting the program for each program is sent to the PMT. Therefore, a specific one of the video and audio signals of a desired program can be extracted by tracing these.

  Furthermore, in the present embodiment, as information accompanying the audio signal, information indicating whether or not each audio signal is a signal that has already been subjected to speech speed conversion at the transmission side or at a previous sound source (shown in FIG. 2). (Speech speed converted information) is transmitted. This speech speed converted information may be specially always transmitted with a predetermined PID, or the information on the PID may be recorded on the PMT or the like so that the information can be retrieved on the receiving side. . In FIG. 2, for the PID of each voice packet, information that is “1” when the voice packet has been subjected to speech speed conversion and “0” when the voice speed conversion has not been performed is sent as a table. ing.

  The audio signal processing apparatus 10A receives a multiplexed signal of control information / program information including speech speed converted information and an audio packet by the receiving unit 11 via the transmission path 3, and the audio packet in the received signal is an audio signal decoder. 12, and the speech speed converted information packet in the received signal is extracted from the PID by the speech speed conversion information detecting unit 13 to detect the speech speed converted information.

  The speech speed conversion processing unit 14 follows the flowchart of FIG. 3 for the decoded speech signal output from the speech signal decoder 12 based on the speech speed converted information detected by the speech speed conversion information detection unit 13. Performs speech speed conversion processing. That is, the speech speed conversion processing unit 14 has already performed speech speed conversion of the selected speech signal after decoding output from the speech signal decoder 12 based on the detected speech speed converted information before transmission. (Step S101 in FIG. 3), if speech speed conversion is performed before transmission, the speech speed conversion processing operation is turned off and the received voice signal is output without performing the speech speed conversion processing. (Step S102 in FIG. 3), when speech speed conversion is not performed before transmission, the speech speed conversion processing operation is turned on and the time axis of the signal in the speech section is compressed / expanded for the received speech signal. Further, after performing a known speech speed conversion process for deleting a silent section of a predetermined length or longer, it is output to the output terminal 15 (step S103 in FIG. 3).

  As described above, in the present embodiment, the speech signal processing apparatus transmits the speech speed converted information indicating whether the speech signal is a signal that has already been subjected to speech speed conversion on the transmission side or a previous sound source. 10A automatically determines whether or not the received speech signal has been speech speed converted based on the speech speed converted information, and does not perform speech speed conversion processing on the received speech signal that has been speech speed converted. Therefore, even if the user does not switch the speech speed conversion every time the channel selection is received, it is possible to automatically prevent the speech speed conversion from being performed twice on the transmission side and the reception side.

  Next, a second embodiment of the present invention will be described. FIG. 4 shows a block diagram of a second embodiment of an audio signal processing apparatus according to the present invention. In the figure, the same components as those in FIG. In FIG. 4, an audio signal processing device 10B according to the second embodiment of the present invention is connected to a transmission device 4 via a transmission line 3, and a video and a plurality of audios in particular form a set from the transmission device 4. A plurality of programs configured as described above are transmitted and received.

  As shown in FIG. 4, the transmission device 4 transmits a plurality of programs including one video signal and a plurality of audio signals, such as program # 01 and program # 02. Here, the video signal and the audio signal of each program are distinguished by PID and packetized and multiplexed by the packetizing unit 5, but the PMT information of each program is sent by PAT, Since the correspondence table of PIDs of video and audio signals included therein is sent as PMT, the audio signal processing device 10B can trace these and specify packets containing video signals and audio signals of a desired program. Video and audio can be obtained by decoding the information in the.

  Here, the audio signal processing apparatus 10 </ b> B receives the transmission signal that has been packet-multiplexed by the receiving unit 11, but supplies control signals such as PAT and PMT to the microprocessor 17 among the signals in the received packet. Based on this information and information input by the user through human interface means 16 (buttons, keyboard, display and cursor keys may be used as appropriate) 16, video and audio signals of a program desired by the user are extracted and received. The audio signal is supplied to the audio signal decoder 12 through error correction in the unit 11, and the video signal is supplied to the video signal decoder 18. Here, although there are a plurality of audio signals in each program, it is assumed that the user can select which of them is decoded and output.

  The video signal selected in this way is decoded by a video signal decoder 18 by a method such as MPEG2, and is output to the video output terminal 19 as a video signal. On the other hand, the selected audio signal is decoded by the audio signal decoder 12 and is input to the speech speed conversion processing unit 14. In this case, the speech speed conversion process is turned off or the speech speed conversion processing unit 14 is bypassed, so that the speech signal is substantially not subjected to the speech speed conversion here. The audio signal output from the speech speed conversion processing unit 14 is output to the audio output terminal 15 as an analog audio signal via a DA conversion unit (not shown).

  FIG. 5A shows an example of a set of audio signals in a program. In this example, there are three basic audio signals: Japanese main voice, Japanese sub voice, and English. Among them, Japanese main voice and English are already subjected to speech speed conversion on the transmitting side. The audio signal is sent separately from these audio signals. There are also 7 types of BGM (Background Music) audio signals for music only suitable for playback along with video of this program, and "News from the station" audio signals such as new program information and program time changes. The audio signal is sent.

  With respect to these voice signals, when there is voice information whose voice speed has been converted with respect to the original voice signal as the corresponding voice speed converted voice information, the correspondence relationship is sent in a table. An example is shown in FIG. Here, in FIG. 5B, the number on the right side corresponds to the audio signal number in this program attached to the left side of each audio signal in FIG. The original voice and the corresponding speech speed converted voice are arranged in order, and after describing all the voice signals having such a correspondence relationship, there is END information, indicating that this information is the end.

  The corresponding speech speed converted voice information can be sent separately from other information by having a unique PID in this transmission described in the PMT. In addition to this, assuming that the speech speed converted information shown in FIG. 2 has been sent, the audio signal processing device 10B also supplies the information to the microprocessor 17 for processing.

  FIG. 6 shows an example of the operation performed by the microprocessor 17 in the audio signal processing apparatus 10B with respect to the audio signal. For each step, the same step as in FIG. 3 is represented by the same symbol. First, based on the detected speech speed converted information, the microprocessor 17 has already performed speech speed conversion of the selected audio signal of the selected program output from the audio signal decoder 12 before transmission. It is determined whether or not it has been performed (step S201 in FIG. 6).

  If it is determined that speech speed conversion has been performed before transmission, the speech speed conversion processing operation is turned off and the received voice signal is output to the output terminal 15 without performing the speech speed conversion processing (step S102 in FIG. 6). . On the other hand, if it is determined in step S201 that the speech speed has not been converted from the speech speed converted information, the microprocessor 17 transmits the speech speed converted speech corresponding to the selected speech signal. It is determined whether or not (step S202 in FIG. 6). This determination may be made with reference to “corresponding speech speed converted voice information” shown in FIG.

  If it is found in step S202 that the corresponding speech rate converted voice signal is transmitted, the voice signal extracted by the receiving unit 11 is switched to the voice signal (step S203 in FIG. 6). In this case, since the audio signal decoded and reproduced by the audio signal decoder 12 has already been subjected to the speech speed conversion, the process proceeds to step S102 and the speech speed conversion processing of the speech speed conversion processing unit 14 is turned off. Is done. On the other hand, if it is determined in step S202 that the corresponding speech speed converted speech signal is not transmitted, the microprocessor 17 proceeds to step S103 and is output from the speech signal decoder 12 by the speech speed conversion processing unit 14. Performs speech speed conversion processing of the audio signal.

  As described above, in the present embodiment, when the voice subjected to the speech speed conversion is transmitted from the transmission device 4, the reason for using it as much as possible is as follows. If the transmission device 4 performs speech speed conversion, the speech speed conversion is performed on the voice collected from the announcer or performer, and background music or the like is added later to the speech speed-converted voice. Is also possible. On the other hand, when the speech speed conversion is performed on the sound including the background music or the like in the audio signal processing apparatus 10B on the receiving side, the background music is disturbed or there is no portion where the sound is interrupted depending on the level of the background music. This is because the speech speed conversion itself may not work, so it is desirable to perform the speech speed conversion on the transmission side if possible. In addition, the reception-side audio signal processing device 10B also reduces power consumption by not operating the speech speed conversion function.

  Next, a third embodiment of the present invention will be described. In this embodiment, instead of the “speech speed converted information” transmitted in the first embodiment, “corresponding speech speed converted speech information” shown in FIG. 5B and FIG. ), The speech signal processing device on the receiving side does not perform the speech speed conversion on the transmitting side, and only the sound suitable for the speech speed conversion is transmitted. It is designed so that speech speed conversion can be applied.

  FIG. 5C shows an example of speech speed conversion conforming information expressed as “1” when the speech of the program shown in FIG. Show. Here, the Japanese main speech (speech 1), the Japanese subspeech (speech 2), and the English speech (speech 3) are adapted to speech speed conversion. In addition, since the fourth and fifth voices are the voices resulting from the speech speed conversion for the Japanese main voice and English, respectively, it is better not to perform the speech speed conversion on the receiving side. It is said that. Further, the content of the sixth “BGM” (speech 6) is music, not a human voice, so it is not suitable for speech speed conversion. The seventh “notification from the station” (speech 7) is guidance by the announcer's voice, so the speech speed conversion is appropriate.

  An example of the processing of the microprocessor in the audio signal processing device on the receiving side when such a speech speed conversion conforming signal is transmitted will be described with reference to the flowchart of FIG. In FIG. 7, the same processing steps as those in FIGS. 3 and 6 are denoted by the same reference numerals. First, the microprocessor determines whether or not the selected voice is suitable for speech speed conversion on the receiving side (step S301 in FIG. 7). This is done by extracting and referring to the transmitted speech speed conversion adaptation information.

  If the microprocessor determines that it is not suitable in step S301, it does not perform speech speed conversion (step S102 in FIG. 7). In the example shown in FIG. 5C, when the fourth or fifth voice signal that has already been subjected to speech speed conversion is selected, or the speech speed conversion processing is not performed on the transmission side, This corresponds to the case where the sixth audio signal (BGM) originally selected for music information and not suitable for speech speed conversion is selected.

  On the other hand, if it is determined in step S301 that it is suitable for speech speed conversion, the microprocessor determines whether speech speed converted speech corresponding to the speech is transmitted (step S202 in FIG. 7). For this determination, “corresponding speech speed converted speech information” shown in FIG. 5B in the received signal may be extracted and referred to.

  The processing after step S202 is the same as that of the second embodiment. When the corresponding speech speed converted speech is transmitted, the speech speed conversion processing is not performed on the receiving side by switching to that speech (see FIG. 7 (steps S203 and S102), if not transmitted, speech speed conversion processing on the receiving side is performed (step S103 in FIG. 7).

  Therefore, according to the present embodiment, in the example of FIG. 5 (b), the first Japanese main speech and the corresponding speech rate conversion speech exist for the third English (fourth and fifth for each). Are switched to those). On the other hand, as shown in FIG. 5C, the second Japanese sub-speech and the seventh “notification from the station” are compatible with the speech speed conversion, but the transmission side performs the speech speed conversion. Therefore, speech speed conversion is performed in the audio signal processing device on the receiving side.

  As described above, according to the present embodiment, when speech speed conversion processing on the transmission side is not performed, it is determined whether or not the voice signal is suitable for speech speed conversion, and the speech speed is determined on the reception side. It is possible to perform speech speed conversion by automatically discriminating only voice signals suitable for conversion processing.

  Note that the present invention is not limited to the above embodiment. For example, in FIG. 7, when steps S202 and S203 are deleted and the selected speech is suitable for speech speed conversion, the process proceeds to step S103. The speech speed conversion process may be performed in advance. The present invention also includes a computer program for realizing the audio signal processing apparatuses 10A and 10B by a computer. In this case, the computer program may be taken into the computer from a recording medium or downloaded to the computer via a communication network.

  The audio signal processing method of the present invention can be applied to the response on the receiver side in the case of providing a service for transmitting speech speed converted audio in broadcasting.

1 is a block diagram of a first embodiment of an audio signal processing device of the present invention. FIG. It is a figure which shows an example of the speech speed converted information transmitted / received in embodiment of FIG. It is a flowchart for operation | movement description of the speech speed conversion process part of FIG. It is a block diagram of 2nd Embodiment of the audio | voice signal processing apparatus of this invention. It is a figure which shows each example of the example of an audio | voice group, corresponding speech speed conversion audio | voice information, and speech speed conversion adaptation information. 5 is a flowchart for explaining the operation of the embodiment of FIG. It is a flowchart for operation | movement description of the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 4 Transmission apparatus 2, 5 Packetization part 3 Transmission path 10A, 10B Voice signal processing apparatus 11 Reception part 12 Voice signal decoder 13 Speech speed conversion information detection part 14 Speech speed conversion processing part 15 Voice output terminal 16 Human interface means 17 Microprocessor 18 Video signal decoder 19 Video output terminal

Claims (3)

A multiplexed signal in which an audio signal and accompanying information related to speech speed conversion indicating whether or not speech speed conversion processing for changing the time axis is performed on the audio signal without changing the audio pitch on the transmission side are multiplexed. Receiving means for receiving
Detecting means for detecting accompanying information related to the speech speed conversion from the multiplexed signal received by the receiving means, and determining the contents thereof;
Reproducing means for reproducing the audio signal from the multiplexed signal received by the receiving means;
If it is determined that the content of the accompanying information regarding the speech speed conversion detected by the detection means has already been subjected to speech speed conversion on the transmission side, the speech speed of the audio signal reproduced by the reproduction means No conversion processing is performed, and when it is determined that the content of the accompanying information regarding the speech speed conversion is not subjected to the speech speed conversion on the transmission side, the speech speed conversion processing of the audio signal reproduced by the reproduction means An audio signal processing apparatus comprising: speech speed conversion processing means for performing A plurality of audio signals including an audio signal not subjected to speech speed conversion processing for changing a time axis without changing an audio pitch on the transmission side and an audio signal subjected to speech speed conversion processing; and the plurality of audio signals Each of the signals is subjected to speech speed conversion processing corresponding to the speech speed converted information indicating whether or not the speech signal has undergone speech speed conversion processing and the speech signal not subjected to the speech speed conversion processing. Receiving means for receiving a multiplexed signal multiplexed with corresponding speech speed voice information indicating whether or not a voice signal is present ;
Detecting means for detecting the speech speed converted information and the corresponding speech speed converted voice information from the multiplexed signal received by the receiving means, and determining the contents thereof;
Reproducing means for selecting and reproducing one of the plurality of audio signals from the multiplexed signal received by the receiving means;
Speech rate conversion processing means for performing speech rate conversion processing on the audio signal;
When the reproducing unit selects and reproduces one of the plurality of audio signals, it is determined that the selected audio signal is an audio signal that has been subjected to speech speed conversion processing by the detecting unit. In this case, the speech speed conversion process is not performed on the selected voice signal with the speech speed conversion processing means off.
When the reproduction unit selects and reproduces one of the plurality of audio signals, the selected audio signal is an audio signal that has not been subjected to speech speed conversion processing by the detection unit, and is compatible When it is determined that there is an audio signal that has been subjected to speech speed conversion processing, the voice speed conversion processing means is switched to the voice signal that has been subjected to the corresponding speech speed conversion processing instead of the selected speech signal. The speech speed conversion process is not performed on the audio signal switched with
When the reproduction unit selects and reproduces one of the plurality of audio signals, the selected audio signal is an audio signal that has not been subjected to speech speed conversion processing by the detection unit, and is compatible Control means for controlling the speech speed conversion processing to be performed on the selected speech signal by turning on the speech speed conversion processing means when it is determined that there is no speech signal subjected to the speech speed conversion processing. An audio signal processing apparatus comprising: A multiplexed signal in which an audio signal and accompanying information related to speech speed conversion indicating whether or not speech speed conversion processing for changing the time axis is performed on the audio signal without changing the audio pitch on the transmission side are multiplexed. A first step of receiving
A second step of detecting ancillary information related to the speech speed conversion from the received multiplexed signal and determining the content thereof;
A third step of reproducing the audio signal from the received multiplexed signal;
When it is determined that the content of the accompanying information regarding the speech speed conversion detected in the second step is not subjected to speech speed conversion on the transmission side, the speech speed conversion processing of the reproduced audio signal A fourth step of performing
When it is determined that the content of the accompanying information related to the speech speed conversion detected in the second step has already been subjected to the speech speed conversion on the transmission side, the speech speed conversion processing of the reproduced audio signal And a fifth step of outputting without performing the method.

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