JP2010123225A - Record reproducing apparatus and record reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce a musical piece recorded in a recording medium by ripping while reducing an unnatural silent part between tracks. <P>SOLUTION: A recorder includes: a continuity determination information acquiring section for acquiring continuity determination information on the basis of at least one of silent parts at the beginning and end of audio data; an encoder adding an encoding delay sample and a padding sample when audio data is encoded; and an additional data output section outputting information about the number of samples of the encoded delay samples and the number of samples of the padding samples together with the continuity determination information. A reproducer includes: an additional data analyzer analyzing an output from the additional data output section; a decoder decoding an encoded stream under control on a decoding process on the basis of the continuity determination information; and a data output section eliminating the encoded delay sample and the padding sample from an output from the decoder on the basis of the result of the additional data analyzer and acquiring output audio data. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a recording / reproducing apparatus and a recording / reproducing method for recording music by compression encoding and decoding and reproducing the recorded data.

  Conventionally, ripping is widely used in which AV (audio / video) data recorded on a recording medium such as a CD (compact disc) is taken into a computer and converted into a file. The range of use of AV data can be expanded by ripping. For example, when AV data is encoded by ripping and recorded on a hard disk or the like, a player that is small in size and excellent in portability and can be played back for a long time can be configured. Devices and software programs having a ripping recording function are also commercialized.

  By the way, in a CD or the like, AV data is often recorded on a different track for each music piece. A playback device such as a CD can also play back each track, and can also play back different tracks continuously. Usually, a silence part is provided at the beginning and end of each music piece, and even when different tracks are continuously reproduced, it is possible to recognize the break of the music piece by the silent part between the music pieces.

  On the other hand, in a live recording CD, a so-called MixCD, etc., the music recorded on each track may not include a silent part at the beginning and end. Therefore, when a plurality of tracks of these CDs are continuously reproduced, the recorded music and the like are seamlessly reproduced.

  By the way, in the encoding process accompanying ripping, previous information in time is used in order to improve encoding efficiency. In ripping, a compressed file is generated for each track, and for the beginning of the track, dummy data (hereinafter referred to as a delay sample) is added as temporally previous information and encoded.

  Similarly, when the ripped compressed data is reproduced, decoding processing is performed using the previous information in time. Accordingly, also in this case, the decoding process is performed with the delay sample added at the beginning of the track.

  Also, the audio data is processed in units of frames having a predetermined bit length, and in the encoding process accompanying ripping, bits less than the frame are added as padding samples at the end of the file.

  In this way, when playing ripped compressed data, in addition to the silence part added to the music, there is a silence part due to the delay samples and padding samples added along with the encoding and decoding processes. End up. In addition, the length of the silent portion added by the encoding and decoding processing varies depending on the device in which the ripping recording function is implemented. For this reason, even if the music does not originally have a silent part and is reproduced seamlessly, a silent part is generated at the break of the track.

  Therefore, in Patent Document 1, the ripped compressed data is decoded, the decoded audio data is temporarily stored in a memory, the silence is removed, and output, thereby seamlessly playing the music recorded on a plurality of tracks. An apparatus that performs accurate reproduction (gapless reproduction) is disclosed.

However, with the device of Patent Document 1, the silent portion is removed even for the music that originally has the silent portion, and when a plurality of tracks are continuously played back, the interval between the songs becomes strangely short or sounds like noise. There was a problem that a sense of incongruity occurred in the sense of hearing.
JP 2008-20863 A

  An object of the present invention is to provide a recording / reproducing apparatus and a recording / reproducing method capable of performing reproduction without a sense of incongruity by controlling reproduction according to the presence of a silent portion in audio data.

  The recording / reproducing apparatus according to one aspect of the present invention includes a continuity determination information acquisition unit that obtains continuity determination information by at least one silent portion at the beginning and end of audio data in the recording unit, and encoding at the beginning of the audio data A coding unit that encodes the audio data by adding a delay sample and adds a padding sample at the end to obtain an encoded stream, and the number of samples of the encoded delay sample added when the audio data is encoded And an additional data output unit that outputs the information on the number of padding samples and the information on the number of padding samples together with the continuity determination information. In the reproduction unit, based on the output of the additional data output unit, the continuity determination information Analyzing information on the number of samples of the encoded delay samples and information on the number of samples of the padding samples Based on the analysis result of the additional data analysis unit, the decoding unit that controls the decoding process based on the continuity determination information, decodes the encoded stream, and outputs reproduced audio data, and the additional data analysis unit And a data output unit that obtains output audio data by removing the encoded delay samples and the padding samples from the reproduced audio data.

  Further, in the recording / reproducing method of one aspect of the present invention, during recording, the continuity determination information acquisition unit obtains continuity determination information by at least one silent part at the beginning and end of the audio data, and the decoding unit The audio data is encoded by adding an encoding delay sample to the beginning of the audio data, and an encoded stream is obtained by adding a padding sample to the end, and the additional data output unit adds it when encoding the audio data. The information of the number of samples of the encoded delay sample and the information of the number of samples of the padding sample are output together with the continuity determination information, and during reproduction, the additional data analysis unit is based on the output of the additional data output unit, Analyzes the continuity determination information, the information on the number of samples of the encoded delay samples, and the information on the number of samples of the padding samples The decoding unit controls the decoding process based on the continuity determination information, decodes the encoded stream and outputs reproduced audio data, and the data output unit outputs the analysis result of the additional data analysis unit. Based on this, the encoded delay samples and the padding samples are removed from the reproduced audio data to obtain output audio data.

  ADVANTAGE OF THE INVENTION According to this invention, it has the effect that reproduction | regeneration without a sense of incongruity can be performed by controlling reproduction | regeneration according to the presence of a silence part in audio | voice data.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 relate to a first embodiment of the present invention. FIG. 1 is a block diagram showing a recording unit of the recording / reproducing apparatus, and FIG. 2 is a block diagram showing a reproducing unit of the recording / reproducing apparatus. In this embodiment, audio data such as music recorded on a recording medium such as a CD is ripped and a file obtained by ripping is reproduced.

  In FIG. 1, uncompressed audio data is recorded for each track on a recording medium 11 such as a CD. The data acquisition unit 12 reads out the uncompressed audio data stored in the recording medium 11 for each track and outputs it to the encoding unit 13. The encoding unit 13 encodes the input uncompressed audio data of each track. For example, the encoding unit 13 encodes the input uncompressed audio data in the MP3 format or the like. The encoding unit 13 outputs the encoded stream to the data output unit 17.

  FIG. 3 is an explanatory diagram for explaining operations of the encoding unit 13 and a decoding unit 23 described later. 3A shows the uncompressed audio data input to the encoding unit 13, FIG. 3B shows the data during the encoding process of the encoding unit 13, and FIG. 3C shows the decoding unit 23. Output (reproduced audio data).

  FIG. 3A shows uncompressed audio data for one track. The uncompressed audio data shown in FIG. 3A is provided with a silent portion at the beginning and end. When encoding in the MP3 format, the encoding unit 13 performs encoding while using previous information in terms of time. The encoding unit 13 performs encoding by adding silent data (encoded delay sample (shaded portion)) as temporally previous information for the head portion of the track where encoding is started. Note that the number of encoding delay samples can be set as appropriate.

  Further, in a general compression encoding method, processing is performed in a predetermined data unit (frame). For example, in the MP3 format, the number of 1152 samples is set as one frame, and processing is performed in units of this frame. However, the number of samples of encoded data generated based on the audio data of music recorded on a CD or the like is not an integral multiple of the frame. Therefore, the encoding unit 13 adds padding samples (shaded portions) of silence data to the end of the encoded stream so that the number of samples of the encoded stream is an integral multiple of the frame.

  In the present embodiment, the encoding unit 13 outputs information on the number of encoded delay samples added at the time of encoding each track to the delay sample number adding unit 14. Also, the encoding unit 13 outputs information on the number of padding samples added when encoding each track to the padding sample number adding unit 15.

  Also, the encoding unit 13 extracts the first N samples and the last N samples of the input uncompressed audio data for one track and supplies them to the continuity determination information adding unit 16. The continuity determination information adding unit 16 determines whether or not the input track head and / or end PCM sample is a silent portion. The continuity determination information adding unit 16 generates and outputs continuity determination information based on whether the sample at the beginning and / or end of the track is a silent part. For example, the continuity determination information adding unit 16 outputs continuity determination information indicating discontinuity when the N samples at the end of the track are silent portions, and is continuous when the N samples at the end of the track are not silent portions. The continuity determination information indicating is output. For example, a 1-bit flag can be used as the continuity determination information.

  The data output unit 17 adds the output of the delay sample number adding unit 14, the padding sample number adding unit 15 and the continuity determination information adding unit 16 to the encoded stream from the encoding unit 13 for the audio data for one track as additional data. Append and output as one file. Each file output from the data output unit 17 is recorded in, for example, a hard disk or memory (not shown) or transmitted via a transmission path (not shown).

  FIG. 4 is an explanatory diagram showing additional data added to the encoded stream. As shown in FIG. 4, the data output unit 17 arranges information on continuity determination information, the number of encoded delay samples, and the number of padding samples at the head of an encoded stream such as an MP3 stream, and outputs the information in units of files. . The example in FIG. 4 shows an example in which additional data is added in a unique format. However, for example, additional data can be added to the encoded stream using a general format such as an ID3 tag. is there. Further, the additional data may be transmitted separately as a separate file from the encoded stream file.

  In the reproduction unit, as shown in FIG. 2, an encoded stream including additional data is captured by the data acquisition unit 21. The encoded stream including the additional data from the data output unit 17 of FIG. 1 is recorded in units of files corresponding to the tracks of the recording medium 11, for example, on a hard disk or the like. The encoded stream including the additional data is read out and output to the additional information analyzing unit 22 and the decoding unit 23.

  The additional information analysis unit 22 extracts and analyzes additional data from the input stream. That is, the additional information analysis unit 22 acquires information on continuity determination information, the number of encoding delay samples, and the number of padding samples for the input encoded stream for each file, and sends the information to the decoding unit 23 and the data output unit 24. Output.

  The decoding unit 23 decodes the input encoded stream, and acquires uncompressed reproduced audio data obtained by restoring the audio data before encoding. The decoding unit 23 performs decoding while using previous information in time. For the head portion of the file to start decoding, the decoding unit 23 performs decoding by adding silence data (decoding delay sample (shaded portion)) as temporally previous information. Note that the number of decoding delay samples can be set as appropriate.

  In this way, the decoded data from the decoding unit 23 is added with the decoding delay sample at the head, as shown in FIG. That is, one track of uncompressed audio data shown in FIG. 3 (a) is preceded by a decoding delay sample and an encoding delay sample by an encoding process by the encoding unit 13 and a decoding process by the decoding unit 23, Padding samples are added to the end and output from the decoding unit 23.

  The example of FIG. 3 is an example including a silent part. On the other hand, a plurality of files obtained by ripping music or the like that does not include a silent part may be continuously reproduced. In this case, continuity determination information indicating continuity is input to the decoding unit 23. Then, when decoding the second and subsequent files, the decoding unit 23 performs decoding using the sample at the end of the immediately preceding file. That is, in this case, the decoding unit 23 does not add a decoding delay sample to the head of the file.

  On the other hand, when a plurality of files obtained by ripping music or the like including a silent part are continuously reproduced, continuity determination information indicating discontinuity is input to the decoding unit 23. In this case, when decoding each file, the decoding unit 23 first resets the decoding process, and adds the decoding delay sample to the head of the file and performs the decoding process as described above. The decoding unit 23 outputs uncompressed reproduced audio data obtained by decoding to the data output unit 24. The decoding unit 23 also outputs information on the number of decoded delay samples to the data output unit 24.

  The data output unit 24 removes a part of the reproduced audio data from the decoding unit 23 based on the analysis result of the additional information analysis unit 22 and outputs it as output audio data. That is, when continuity is indicated by the continuity determination information, the data output unit 24 outputs from the decoding unit 23 based on the information on the number of encoding delay samples, the number of decoding delay samples, and the number of padding samples. Among them, the decoding delay sample, the encoding delay sample, and the padding sample are removed and output as output audio data. Further, when the discontinuity is indicated by the continuity determination information, the data output unit 24 encodes out of the outputs from the decoding unit 23 based on the information on the number of encoding delay samples and the number of padding samples. Delay samples and padding samples are removed and output as output audio data.

  Next, the operation of the embodiment configured as described above will be described with reference to FIGS.

  First, the operation during recording (ripping) will be described. FIG. 5 is a flowchart showing the operation during recording. The data acquisition unit 12 reads, for example, uncompressed audio data of a song recorded on a recording medium 11 such as a CD for each track, and outputs it to the encoding unit 13. The encoding unit 13 encodes uncompressed audio data for one track. In this case, the encoding unit 13 acquires, for example, n samples at the end of the track in step S1 of FIG. The encoding unit 13 performs encoding by adding an encoding delay sample to the head of the track (steps S2 and S3).

  In the next step S4, the continuity determination information adding unit 16 determines whether all n samples at the end of the track are silent portions. If the continuity determination information adding unit 16 is not a silent part, the continuity determination information adding unit 16 determines that the continuity determination information adding unit 16 is part of a piece of music or the like continuously recorded on a plurality of tracks in step S5. Is output. If the continuity determination information adding unit 16 is a silent portion, it is determined in step S6 that the continuity determination information adding unit 16 is a piece of music or the like recorded alone on an individual track, and continuity determination information indicating discontinuity is obtained. Is output. The encoding unit 13 adds padding samples to the end of the encoded stream to make the stream length an integral multiple of the frame size (step S7).

  The delay sample number adding unit 14, the padding sample number adding unit 15, and the continuity determination information adding unit 16 output the encoded delay sample number information, the padding sample number information, and the continuity determination information to the data output unit 17, respectively. . The data output unit 17 adds information on the number of encoded delay samples, information on the number of padding samples, and continuity determination information to the encoded stream as additional data and outputs the additional data. That is, the data output unit 17 adds additional data to the encoded stream based on one track of the recording medium 11 and outputs it as one file. The stream file including the additional data from the data output unit 17 is recorded on a recording medium such as a hard disk (not shown).

  Next, the operation during reproduction will be described. FIG. 6 is a flowchart showing the operation during reproduction. 7 and 8 are explanatory diagrams showing changes in data added during ripping and reproduction. FIG. 7 shows an example including a silent part, and FIG. 8 shows an example not including a silent part. FIG. 7 and FIG. 8 show different types of silence, coding delay sample, padding sample, and decoding delay sample depending on the type of hatching.

  The data acquisition unit 21 reads the encoded stream including the additional data in units of files from the recording medium in which the encoded stream including the additional data from the data output unit 17 of the recording unit is recorded in units of files. The additional data read by the data acquisition unit 21 is given to the additional information analysis unit 22 and analyzed (step S11). The additional information analysis unit 22 analyzes the continuity determination information, the information on the number of encoded delay samples, and the information on the number of padding samples in the additional data, and provides the analysis result to the decoding unit 23 and the data output unit 24. The decoding unit 23 determines whether or not the analysis result of the continuity determination information indicates continuity (step S12), and when it is discontinuous, initializes the decoding process (step S13).

  FIG. 7 corresponds to this case. FIG. 7A shows a state in which music m−1, m, m + 1 is recorded on the recording medium 11. Each piece of music m-1, m, m + 1 is recorded on the m-1th track, mth track, and m + 1th track of the recording medium 11, respectively. Each piece of music m-1, m, m + 1 is an independent piece of music unrelated to other pieces of music, and includes a silent part (shaded part) at the beginning and end.

  At the time of recording, as shown in FIG. 7B, the encoding unit 13 adds a coding delay sample to the beginning of each music m-1, m, m + 1 and adds a padding sample to the end (for example, , MP3 file). These files are input to the decryption unit 23. Since the file shown in FIG. 7B has silent portions at the beginning and end and the continuity determination information indicates discontinuity, the decoding unit 23 shifts the processing to step S13 to perform decoding processing. Is initialized. In step S14, decoding is performed by adding a decoding delay sample. As a result, as shown in FIG. 7C, the output of the decoding unit 23 adds the decoding delay sample and the encoding delay sample to the head of each music piece m-1, m, m + 1 before the silent portion. At the end, a delay sample is added after the silent part.

  The output of the decoding unit 23 is given to the data output unit 24. The data output unit 24 removes and outputs a part of the reproduced audio data from the decoding unit 23 based on the continuity determination information. In this case, since the continuity determination information is discontinuous, the data output unit 24 removes the decoding delay samples in step S15, and further, in steps S17 and S18, based on the analysis result of the additional data, Remove coding delay samples and padding samples. Thus, the data output unit 24 removes the data added during the encoding and decoding processes, and then outputs them (step S19).

  FIG. 7D shows an example in which uncompressed output audio data from the data output unit 24 is continuously output. As shown in FIG. 7 (d), the music m-1, m, m + 1 from the data output unit 24 still has a silent part, and the audio of the music m-1, m, m + 1 from the data output unit 24 remains. Even in the case of continuous output, silence is reproduced for each piece of music, and the user can listen to each piece of music without a sense of incongruity.

  On the other hand, if continuity is indicated by the continuity determination information, the decoding unit 23 performs decoding without initializing the decoding process in step S16.

  FIG. 8 corresponds to this case. FIG. 8A shows a state in which music m-1, m, m + 1 are recorded on the recording medium 11. Each piece of music m-1, m, m + 1 is recorded on the m-1th track, mth track, and m + 1th track of the recording medium 11, respectively. Each piece of music m-1, m, m + 1 is to be reproduced continuously in relation to each other. For example, one piece of music is divided and recorded on the (m-1) th to (m + 1) th tracks. can get. The beginning and end of these music pieces m-1, m, and m + 1 do not include a silent part.

  At the time of recording, as shown in FIG. 8B, the encoding unit 13 adds a coding delay sample to the beginning of each music piece m-1, m, m + 1 and adds a padding sample to the end (for example, , MP3 file). These files are input to the decryption unit 23. The file shown in FIG. 8B has no silence at the beginning and end, and the continuity determination information indicates continuity, so the decoding unit 23 shifts the processing to step S16. That is, in this case, the decoding unit 23 performs decoding using the information of the previous music without resetting the decoding process. For example, when decoding the music m, the decoding of the beginning of the music m is performed using the information at the end of the music m-1. Therefore, in this case, the decoding unit 23 does not add a decoding delay sample.

  Thus, as shown in FIG. 8 (c), the output of the decoding unit 23 is such that the encoded delay sample is added before the silence part at the beginning of each piece of music m-1, m, m + 1, and the silence is added at the end. The delay sample is added after the part.

  The output of the decoding unit 23 is given to the data output unit 24. The data output unit 24 removes a part of the decoding unit 23 based on the continuity determination information and outputs the result. In this case, since the continuity determination information is continuous, the data output unit 24 removes the encoding delay sample and the padding sample in steps S17 and S18 based on the analysis result of the additional data. In this way, the data output unit 24 removes the data added during the encoding process, and then outputs it (step S19).

  FIG. 8D shows an example in which output sound data (output sound) from the data output unit 24 is continuously output. As shown in FIG. 8D, the music m-1, m, m + 1 from the data output unit 24 has no silence, and the audio of the music m-1, m, m + 1 from the data output unit 24 is continuously received. In this case, each piece of music is played continuously without a break, and the user can listen to a series of songs without a sense of incongruity.

  As described above, in the present embodiment, the added information on the number of encoded delay samples, information on the number of padding samples, and continuity determination information are added to the encoded stream in the recording unit. On the other hand, the playback unit switches the decoding process based on the continuity determination information, and at the time of encoding and decoding based on the information on the number of encoding delay samples, the information on the number of padding samples, and the information on the number of decoding delay samples. The data added at times is removed and output. In other words, the inter-song (silent part) intentionally added to the original music is left as it is after recording and reproduction, and the extra silence that is not added to the original music is added in principle at the time of encoding / decoding. By removing only the portion, it is possible to play sequentially without disturbing the audibility of the original music. Therefore, even when music recorded continuously on a plurality of tracks is ripped and reproduced, gapless reproduction that is smooth to the sense of hearing can be performed without inserting useless silence between the songs.

  Further, in the present embodiment, when the continuity determination information indicates that it is continuous, reset at the start of the decoding process is not performed. As a result, when a file based on a series of continuous music pieces or the like is decrypted, it is possible to perform decryption processing using information having a temporally previous relationship, and improve the accuracy of decryption. Is possible.

  FIG. 9 is a flowchart showing the second embodiment of the present invention. This embodiment can be realized by a hardware configuration similar to that of the first embodiment. In FIG. 9, the same steps as those in FIG.

  In general, a playback apparatus plays back multiple songs in an arbitrary order, such as random playback or playlist playback, in addition to a sequential playback mode in which multiple songs are played sequentially (hereinafter referred to as sequential playback). It has a playback mode.

  This embodiment corresponds to the arbitrary playback mode. This embodiment is different from the operation flow of FIG. 6 in that step S21 is employed instead of step S12 and step S22 is added.

  In step S21, it is determined whether the continuity determination information is continuous and the playback mode is not the arbitrary playback mode. If the continuity determination information is continuous and not in the arbitrary playback mode, that is, in the sequential playback mode, the process proceeds to step S16. That is, when the playback mode is the sequential playback mode, the same processing as in FIG. 6 is performed.

  If the continuity determination information is not continuous and / or the playback mode is an arbitrary playback mode, the decoding process is initialized in step S13. That is, in this case, since it is not necessary to use the previous information in time for decoding, the decoding process is reset. Next, the decoding unit 23 performs decoding by adding a decoding delay sample (step S14).

  In the next step S22, it is determined whether or not the continuity determination information is continuous. If not continuous, the decoding delay sample, the encoding delay sample, and the padding sample are removed by the same processing as in FIG. 6 even in the arbitrary playback mode (steps S15 to S18).

  When continuity is indicated by the continuity determination information, the data output unit 24 removes the encoding delay sample and the padding sample while leaving the decoding delay sample. (Steps S17 and S18).

  That is, in the present embodiment, when the continuity determination information is continuous in the arbitrary playback mode, the decoding delay sample is left in the output audio data. 6 is performed.

  In an arbitrary playback mode such as random playback, there is no relation between two pieces of music that are continuously played back. However, there is no silence in the music whose continuity is indicated by the continuity determination information. Therefore, in this embodiment, when it is determined in step S22 that the data is continuous, output audio data in which the decoded delay samples are left is output. Thereby, even when a piece of music whose continuity determination information is continuous is played back at random, a silent part is played back between the pieces of music, and it can be heard with less sense of incongruity.

  As described above, in the present embodiment, the same effect as that of the first embodiment can be obtained, and even in the case of the music that is made continuous by the continuity determination information, there is no sound between the music in the arbitrary playback mode. Part can be added and reproduced, and reproduction with little uncomfortable feeling is possible.

  In each of the above-described embodiments, the MP3 encoding method has been described as an example of the encoding method. However, the encoding format can be set as appropriate, for example, encoding / decoding using the AAC (MPEG2 / MPEG4 AAC) method or the like. The same applies to the case of decoding.

  In each of the above embodiments, the example in which the additional data is added to the encoded stream and output has been described. However, the additional data is stored in the memory of the recording / playback apparatus as a separate file, and the additional data is stored from the memory during playback. It is clear that the same operational effects as those of the above embodiments can be obtained by reading.

  In each of the above-described embodiments, the example in which the continuity determination information is determined based only on whether there is a silent part at the end of the music has been described. However, the determination is based on whether there is a silent part at the beginning of the music. Alternatively, the determination may be made based on whether there is a silent part at both the beginning and the end of the music.

1 is a block diagram showing a recording unit of a recording / reproducing apparatus according to a first embodiment of the present invention. 1 is a block diagram showing a reproducing unit of a recording / reproducing apparatus according to a first embodiment of the present invention. Explanatory drawing for demonstrating operation | movement of the encoding part 13 and the decoding part 23. FIG. Explanatory drawing which shows the additional data added to an encoding stream. The flowchart which shows the operation | movement at the time of recording. The flowchart which shows the operation | movement at the time of reproduction | regeneration. Explanatory drawing which shows the change of the data added at the time of ripping and reproduction | regeneration. Explanatory drawing which shows the change of the data added at the time of ripping and reproduction | regeneration. The flowchart which shows the 2nd Embodiment of this invention.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 12 ... Data acquisition part, 13 ... Encoding part, 14 ... Delay sample number addition part, 15 ... Padding sample number addition part, 16 ... Continuity determination information addition part, 17 ... Data output part

Claims (5)

In the recording section,
A continuity determination information acquisition unit for obtaining continuity determination information by at least one silent part at the beginning and end of the audio data;
An encoding unit that adds an encoding delay sample to the beginning of the audio data to encode the audio data, and adds a padding sample to the end to obtain an encoded stream;
An additional data output unit that outputs information on the number of samples of the encoded delay samples and information on the number of samples of the padding samples added together with the continuity determination information added when encoding the audio data;
In the playback section,
Based on the output of the additional data output unit, an additional data analysis unit that analyzes the continuity determination information, the information on the number of samples of the coding delay samples, and the information on the number of samples of the padding samples;
A decoding unit that controls decoding processing based on the continuity determination information, decodes the encoded stream, and outputs reproduced audio data;
A recording / reproducing apparatus comprising: a data output unit that obtains output audio data by removing the encoded delay samples and the padding samples from the reproduced audio data based on an analysis result of the additional data analysis unit . The decoding unit initializes the decoding process based on the continuity determination information and decodes after adding a decoding delay sample to the head of the encoded stream, or initializes the decoding process. Set whether to decode without adding the decoding delay sample without
The data output unit obtains the output audio data by removing the decoding delay sample, the encoding delay sample, and the padding sample from the reproduced audio data based on the continuity determination information, or the encoding 2. The recording / reproducing apparatus according to claim 1, wherein output audio data is obtained by removing delay samples and the padding samples.   The additional data output unit adds the information on the number of samples of the coding delay samples and the information on the number of samples of the padding samples to the coded stream from the coding unit and outputs the added data. Item 3. The recording / reproducing apparatus according to Item 1 or 2. During recording,
The continuity determination information acquisition unit obtains continuity determination information by at least one silent part at the beginning and end of the audio data,
The decoding unit adds an encoding delay sample to the beginning of the audio data to encode the audio data, and adds a padding sample to the end to obtain an encoded stream,
The additional data output unit outputs the information on the number of samples of the encoded delay samples and the information on the number of samples of the padding samples added at the time of encoding the audio data together with the continuity determination information,
During playback,
Based on the output of the additional data output unit, the additional data analysis unit analyzes the continuity determination information, the information on the number of samples of the encoding delay sample and the information on the number of samples of the padding sample,
A decoding unit that controls decoding based on the continuity determination information, decodes the encoded stream, and outputs reproduced audio data;
A recording / reproducing method, wherein the data output unit obtains output audio data by removing the encoded delay sample and the padding sample from the reproduced audio data based on the analysis result of the additional data analyzing unit. The decoding unit initializes the decoding process based on the continuity determination information and decodes after adding a decoding delay sample to the head of the encoded stream, or initializes the decoding process. Set whether to decode without adding the decoding delay sample without
The data output unit obtains the output audio data by removing the decoding delay sample, the encoding delay sample, and the padding sample from the reproduced audio data based on the continuity determination information or the encoding delay 5. The recording / reproducing method according to claim 4, wherein output audio data is obtained by removing the sample and the padding sample.

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