JP2008251097A - Music data processor, control program, and computer readable recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a music data processor capable of eliminating the discontinuity of compressed music data duringits its reproduction even when there is no silence time among music intervals and a plurality music data including the interval are compressed among the intervals of all music data recorded in a storage medium. <P>SOLUTION: A control unit 1 reads the Q sub-code information from a CD 10 including a plurality of music data and Q sub-codes. A control unit 4 detects a plurality of music data having no non-sound time between pieces of music from all the music data contained in the CD 10 based on the read sub-codes, and converts the Q sub-codes so as to set the plurality of detected music data to be single music data. The control unit 4 and an encoder 2 extract the plurality of detected music data based on the converted Q sub-codes, and compress the plurality of music data by a predetermined compression form. A reproduction part 7 reproduces the compressed music data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a song data processing apparatus, a control program, and a computer-readable recording medium that compress and save song data included in a storage medium such as a CD (Compact Disc).

  Conventionally, music data stored on a CD (Compact Disc) is compressed according to a format such as MP3 (MPEG Audio Layer 3) or WMA (Windows (registered trademark) Media Audio), and the compressed data is stored in a storage medium. Techniques for preservation are known.

  In these compression formats, generally one piece of music data is stored in one file. This is because the file can be searched by the user by dividing the file for each song, and the user-desired song can be selected and reproduced.

  By the way, some CDs have no silent part between some or all of the songs. A CD that records live audio or a medley-type song (for example, a song in the genre of Eurobeat or dance music).

  Even when song data recorded on such a CD is compressed and stored in a storage medium, one song data is saved in one file in order to enable a user to search for a file. For this reason, a silent portion (gap) is generated in the music that is originally reproduced continuously.

  In order to solve this problem, even if the music data of a live CD that does not have silence between songs is saved in a compressed file format, it is possible to play the specified song without interruption of music between songs. Such a recording / reproducing apparatus is known (see, for example, Patent Document 1).

  In this recording / playback apparatus, all the song data of the live CD is stored in a single compressed file, thereby eliminating the need to perform a file search for song data during playback and preventing sound interruptions between songs. .

Further, in order to save all the music data of the live version CD in one compressed file by the recording / reproducing apparatus, it is necessary for the user to select a predetermined mode and input an instruction to shift to the motor.
Japanese Patent Laid-Open No. 2004-93729

  However, the recording / reproducing apparatus of Patent Document 1 cannot cope with a CD in which silent time does not exist between some of the recorded music data. That is, in the recording / reproducing apparatus of the above-mentioned Patent Document 1, in reproducing a plurality of music data including a part of the music, a silent portion (gap) is not generated, and a plurality of music data including the other music is not recorded. During reproduction, it is not possible to cause a silent portion (gap) to occur.

  The present invention has been made in view of the above problems, and its purpose is that there is no silent time between some songs among all the song data recorded on the storage medium and A music data processing apparatus, a control program, and a computer-readable recording medium capable of eliminating sound interruption during reproduction of compressed music data even when a plurality of music data including a part of music are compressed It is to provide.

  In order to achieve the above object, the music data processing device according to claim 1 is based on reading means for reading the code information from a storage medium including a plurality of music data and code information, and the read code information. Detection means for detecting a plurality of song data in which no silence is present between songs among all song data included in the storage medium, and the detected plurality of song data become a single song data Conversion means for converting the code information, a compression means for extracting the plurality of detected song data from the storage medium based on the converted code information, and compressing the data in a predetermined compression format; And reproduction means for reproducing the music data compressed by the compression means.

  The music data processing apparatus according to claim 2 is a music data processing apparatus according to claim 1, further comprising storage means for storing the music data compressed by the compression means, wherein the reading means is the storage medium. When inserted, the code information is read from the storage medium, the compression means compresses all music data included in the storage medium in a predetermined compression format based on the converted code information, The storage means stores the compressed music data.

  The music data processing device according to claim 3 is the music data processing device according to claim 1 or 2, wherein the music data compressed by the compression means is a position at which performance of the detected music data is started. It is characterized by having information.

  The music data processing apparatus according to claim 4 is the music data processing apparatus according to claim 1 or 2, wherein the code information includes a track number and index information regarding all music data included in the storage medium. , N (n is a natural number) and when there is no silent time between the song data of the n + 1th song data and the song data of the (n + 1) th song data, the conversion means converts the track number and index information of the (n + 1) th song into the index information of the nth song. The music data after being compressed by the compression means has the track number and index information of the nth music and the converted index information.

  The control program according to claim 5 is included in the storage medium based on the read-out means for reading out the code information from a storage medium including a plurality of song data and code information, and the read-out code information. Detection means for detecting a plurality of song data in which there is no silence between songs from all song data, and converting the code information so that the detected plurality of song data becomes a single song data Converting means for extracting the plurality of detected music piece data from the storage medium based on the converted code information, compressing the data in a predetermined compression format, and music data compressed by the compressing means It is characterized by functioning as a reproducing means for reproducing.

  The computer-readable recording medium according to claim 6, wherein the computer reads the code information from a storage medium including a plurality of song data and code information, and stores the code based on the read code information. Detection means for detecting a plurality of song data in which there is no silence between songs among all the song data included in the medium, so that the plurality of detected song data become a single song data Conversion means for converting code information, based on the converted code information, the plurality of detected song data are extracted from the storage medium and compressed in a predetermined compression format, and compressed by the compression means A program for functioning as a reproducing means for reproducing the music data is recorded.

  According to the first, fifth and sixth aspects of the present invention, not only when there is no silent time between songs of all song data recorded on the storage medium and a plurality of song data including all songs are compressed. Even when compressing a plurality of pieces of music data including a part of the music between the musics of all the music data recorded in the storage medium, there is no silent time between the musics. The chord information is converted and the plurality of song data is compressed so that a plurality of song data in which no silence time exists in advance becomes a single song data. Cuts can be eliminated.

  According to the invention of claim 2, when the storage medium is inserted, all music data included in the storage medium can be automatically compressed and stored in a predetermined compression format.

  According to the invention of claim 3, based on the performance start position information, the performance start position of any one of the plurality of music data before compression is searched, or the music data is obtained from the searched performance start position. Can be played.

  According to the invention of claim 4, based on the track number and index information of the n-th song, the performance start position of the n-th song data before compression is searched from the compressed song data, or the searched performance start The song data can be reproduced from the position. Furthermore, based on the converted index information, the performance start position of the music data of the (n + 1) th music before compression can be searched from the compressed music data, or the music data can be reproduced from the searched performance start position. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a music piece data processing apparatus according to an embodiment of the present invention.

  The song data processing apparatus 100 according to the present embodiment is configured with, for example, an audio apparatus, a car audio apparatus, or a car navigation apparatus. The music data processing apparatus 100 includes a reading unit 1 (reading unit), an encoder 2 (compression unit), a storage unit 3 (storage unit), a control unit 4 (detection unit, conversion unit, compression unit), an operation unit 5, and a reproduction unit. 6 (reproducing means) are connected to each other via a bus 9. The playback unit 6 includes a decoder 7 and is connected to a speaker 8.

  The reading unit 1 includes a CD drive, and reads at least one piece of music data and Q subcode (code information) included in a CD (Compact Disc) 10. The encoder 2 compresses the music data read by the reading unit 1 into a predetermined compression format (for example, MP3 (MPEG Audio Layer 3) or WMA (Windows (registered trademark) Media Audio)). The storage unit 3 includes a hard disk drive (HDD), an SD (Secure Digital) memory card, a USB memory, or the like, and stores a predetermined program and compressed music data. The control unit 4 includes, for example, a CPU, a RAM, a ROM, and the like, and controls the entire apparatus.

  The operation unit 5 includes an operation panel (not shown), operation buttons, and the like, and inputs instructions from the user. The playback unit 6 plays back the music data selected via the operation unit 5. The decoder 7 decodes the compressed music data and executes reproduction. The speaker 8 outputs the music data reproduced by the decoder 7.

  FIG. 2 is a diagram showing an example of the performance start time (absolute time) from the beginning of the disk and the performance time (relative time) of each track when there is a silent time between all songs (between tracks). As shown in FIG. 2, by comparing the performance start time and the performance time of each track, it can be seen that there is a time (silence time) other than the performance time between the songs.

  FIG. 3 is a diagram showing an example of the performance start time and the performance time of each track when there is a medley in a part of CD music data. Medley is a series of songs, but the tracks are separated.

  FIG. 4 is a diagram showing an example of the performance start time and performance time when all of the music data of the CD is composed of a series of music.

  The CD 10 has a data structure as shown in FIG. The Q subcode is information corresponding to the table of contents of the CD 10, and has the configuration shown in FIG. As shown in FIG. 5 (B), the Q subcode includes information about the track number, index, start time (absolute time) of the track from the beginning of the disk, zero, and track performance time (relative time) for each track. Have. The index indicates position information that can be cued in the track. The index can have a value from 00 to 99, but the index 00 is a pause interval. One track is a section from index 01 to index 00 of the next song. A frame indicates a time in units of 1/75 second, and zero indicates a counter that labels successive frames.

  6 to 8 are diagrams showing examples of Q subcodes indicating the relationship between the performance start time (absolute time) and the performance time (relative time) of each track shown in FIGS.

  As shown in FIG. 6, there is a difference in performance time of 2 seconds between index 00 and index 01. This is generally called song space.

  As shown in FIG. 7, the index 00 of track 3, track 8, and track 9 is 0 seconds, and the absolute time corresponding to the index 00 is the same as the performance start time (absolute time) of the next song. From this, it can be seen that there is no interval between songs (ie, there is no silent time). Similarly, as shown in FIG. 8, since index 00 from track 2 to track 10 is 0 seconds and the absolute time is the same as the performance start time (absolute time) of the next song, there is no interval between songs (ie, It can be seen that there is no silent time.

  FIG. 9 is a flowchart showing processing executed by the song data processing apparatus 100.

  First, the control unit 4 performs conversion processing of the Q subcode included in the CD 10 in order to rip (extract) and compress the music data included in the CD 10 (step S1). Details of the Q subcode conversion process will be described later.

  Next, the control unit 4 rips (extracts) music data included in the CD 10 based on the converted Q subcode, and converts the music data ripped by the encoder 2 into a predetermined compression format (for example, Compression is performed using MP3 (MPEG Audio Layer 3) or WMA (Windows (registered trademark) Media Audio) (step S2). Thereafter, the control unit 4 stores the compressed music data in the storage unit 3 (step S3).

  FIG. 10 is a diagram illustrating an example of song data stored in the storage unit 3. Here, as shown in FIG. 3, an example of compressed music data in the case where there is a medley in a part of music data is shown.

  As shown in FIG. 10, for example, when there is no silent time between the second and third songs, the second and third song data are connected and compressed as a single song. The compressed music data is stored as one file together with the attribute data. The attribute data includes track number, index, relative time, and absolute time information. Here, the track number of the song data compressed by connecting the second song and the third song is 2, and the index is “01” corresponding to the second song data and “02” corresponding to the third song data. Including.

  Therefore, even if the music data of the second music and the third music are connected to become a single compressed music data, it is possible to reproduce from the music data of the third music based on the index information. When there is a silent time between songs, the song data before and after the songs are compressed as separate song data.

  Returning to FIG. 9, when the track number or index information is input via the operation unit 5, the control unit 4 sends the compressed music data corresponding to the input track number or index information from the storage unit 3. The search is performed, and the corresponding compressed music data is output to the reproducing unit 6 (step S4). The reproducing unit 6 decodes the compressed music data by the decoder 7 and outputs the decoded music data to the speaker 8 (step S5), and the process is terminated. Thereby, reproduction of the compressed music data desired by the user is executed.

  FIG. 11 is a flowchart showing the conversion process of the Q subcode. This process is automatically started when the CD 10 is inserted into the music data processing apparatus 100.

  First, the reading unit 1 reads the Q subcode recorded on the innermost periphery of the CD 10 (step S11). The control unit 4 develops and analyzes the Q subcode read by the reading unit 1 (step S12). The analysis results are shown in FIGS. 6 to 8 described above, and are stored in the storage unit 3.

  Next, the control unit 4 represents the performance start time (absolute time; time represented by PMIN, PSEC, and PFRAME) of the entire CD 10 (that is, all tracks) and the performance time (relative time; MIN, SEC, and FRAME) of each track. (Step S13) and whether or not the performance time (relative time) of the n (n = 1, 2,...) Music and the performance start time (absolute time) of the (n + 1) th music are the same. It discriminate | determines (step S14).

  If the performance time of the nth song is not the same as the performance start time of the (n + 1) th song at step S14, the control unit 4 determines that there is a silent time between songs, and proceeds to step S18. On the other hand, if the performance time of the nth song is the same as the performance start time of the (n + 1) th song, the control unit 4 determines that there is no silent time between songs, and proceeds to step S15. Steps S15 to S17 show specific processing for converting the Q subcode.

  In step S15, the control unit 4 acquires the performance time (relative time) of the (n + 1) th song. Next, the control unit 4 adds the performance time acquired in step S15 to the performance time (relative time) of the nth song (step S16).

  Thereafter, the control unit 4 converts the track number (TNO) of the (n + 1) th song and the index (INDEX) in the track as the index of the nth song in order to leave the position information of the (n + 1) th song (that is, information on the performance start position) (step S17). Specifically, the Q subcode of the analysis result shown in FIG. 7 is converted or rewritten as shown in FIG. 12, and the Q subcode of the analysis result shown in FIG. 8 is converted or rewritten as shown in FIG. It is done. In addition, the thick frame in FIG. 12, 13 shows the location changed from FIG.

  For example, comparing tracks 2 and 3 in FIG. 7 and FIG. 12, the index 00 of track 3 (that is, information relating to the pause of the song data) in which there is no silence between songs is deleted, and the performance time of track 2 ( Relative time) is rewritten, and index 01 of track 3 is rewritten to index 02 of track 2.

  Next, the control unit 4 determines whether or not there is a next track in the CD 10 (step S18). If YES in step S18, analysis of all tracks in the CD 10 has been completed, so this process ends. On the other hand, if NO in step S18, the process returns to step S13, and the processes in steps S13 to S18 are repeated until the analysis of all the tracks in the CD 10 is completed.

  When returning from step S18 to step S13, in step S14, n is increased by 1, and a time obtained by adding the performance time (relative time) of the nth song to the performance start time (absolute time) of the nth song, It is determined whether or not the performance start time (absolute time) of the (n + 1) th song is the same.

  As described in detail above, according to the present embodiment, the reading unit 1 reads the Q subcode information from the CD 10 including a plurality of song data and Q subcode, and the control unit 4 reads the read Q Based on the subcode, a plurality of pieces of music data in which there is no silence time is detected from all pieces of music data included in the CD 10 so that the detected pieces of music data become a single piece of music data. Then, the Q subcode is converted. Based on the converted Q subcode, the control unit 4 and the encoder 2 extract a plurality of detected song data from the CD 10, compress them in a predetermined compression format, and the playback unit 7 plays back the compressed song data To do.

  Therefore, there is no silent time between songs of all song data recorded on a CD, and not only when compressing a plurality of song data including all songs but also of all song data recorded on a CD. Among songs, when there is no silence time between some songs and a plurality of song data including some songs is compressed, a plurality of song data without silence time between songs in advance Since the Q sub-code is converted and a plurality of pieces of music data are compressed so that the music data becomes a single piece of music data, it is possible to eliminate sound interruption during reproduction of the compressed music data.

  The reading unit 1 reads the Q subcode from the CD 10 when the CD 10 is inserted, and the control unit 4 and the encoder 2 read all music data included in the CD 10 based on the converted Q subcode. The storage unit 3 stores the compressed music data in a predetermined compression format. When the CD 10 is inserted, all the music data included in the CD is automatically compressed and stored in the predetermined compression format. can do.

  Furthermore, since the music data after compression has position information (index) of performance start of a plurality of music data in which no silence time exists between the music, any one of the music data before compression is selected based on the index. One performance start position can be searched, and music data can be reproduced from the searched performance start position.

  Furthermore, the Q subcode includes a track number and an index related to all music data included in the CD 10, and there is no silent time between the music data of the nth (n is a natural number) music data and the music data of the (n + 1) th music. In this case, the control unit 4 converts the track number and index of the (n + 1) th song as an index of the nth song, and the compressed song data has the track number and index of the nth song and the converted index.

  Therefore, based on the track number and index of the n-th song, the performance start position of the n-th song data before compression is searched from the compressed song data, or the song data is reproduced from the searched performance start position. be able to. Furthermore, based on the converted index, the performance start position of the music data of the n + 1th music before compression can be searched from the music data after compression, and the music data can be reproduced from the searched performance start position. .

  Note that a recording medium on which a software program for realizing the functions of the music data processing apparatus 100 is recorded is supplied to the music data processing apparatus 100, and the computer (that is, the control unit 4) of the music data processing apparatus 100 is used. Even when the program stored in the storage medium is read out and executed, the same effect as in the above embodiment can be obtained. Examples of the storage medium for supplying the program include a CD-ROM, a DVD, or an SD card.

  The same effect as that of the above-described embodiment can also be obtained when the computer (that is, the control unit 4) of the music data processing apparatus 100 executes a software program for realizing the functions of the music data processing apparatus 100. .

  The present invention is not limited to the above-described embodiment, and can be implemented with various modifications within a range not departing from the gist thereof.

It is a block diagram which shows the structure of the music data processing apparatus which concerns on embodiment of this invention. It is a figure which shows the example of the performance start time (absolute time) from the head of a disk when there is a silence time between all the music (between tracks), and the performance time (relative time) of each track. It is a figure which shows the example of a performance start time and the performance time of each track | truck when a medley exists in a part of music data of CD. It is a figure which shows the example of the performance start time and performance time when all the music data of CD are comprised with a continuous music. (A) is a figure which shows the data structure in CD, (B) is a figure which shows the structure of Q subcode. FIG. 3 is a diagram illustrating an example of a Q subcode indicating a relationship between a performance start time (absolute time) and a performance time (relative time) of each track illustrated in FIG. 2. It is a figure which shows an example of Q subcode which shows the relationship between the performance start time (absolute time) shown in FIG. 3, and the performance time (relative time) of each track | truck. FIG. 5 is a diagram illustrating an example of a Q subcode indicating a relationship between a performance start time (absolute time) and a performance time (relative time) of each track illustrated in FIG. 4. 4 is a flowchart showing processing executed by the song data processing apparatus 100. It is a figure which shows an example of the music data preserve | saved at the preservation | save part. It is a flowchart which shows the conversion process of Q subcode. It is a figure which shows an example of the Q subcode after conversion corresponding to FIG. It is a figure which shows an example of the Q subcode after conversion corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reading part 2 Encoder 3 Storage part 4 Control part 5 Operation part 6 Playing part 7 Decoder 8 Speaker 9 Bus 100 Music data processing apparatus

Claims (6)

Reading means for reading the code information from a storage medium including a plurality of song data and code information;
Based on the read code information, detection means for detecting a plurality of song data in which no silent time exists between songs, from all the song data included in the storage medium,
Conversion means for converting the code information so that the plurality of detected song data become a single song data;
Based on the converted code information, a plurality of detected music data is extracted from the storage medium and compressed in a predetermined compression format;
A music piece data processing apparatus comprising: reproduction means for reproducing the music piece data compressed by the compression means. The storage unit stores the music data compressed by the compression unit, and the reading unit reads the code information from the storage medium when the storage medium is inserted. 2. The music data included in the storage medium is compressed in a predetermined compression format based on the code information of the recording medium, and the storage unit stores the compressed music data. Song data processing device. The music data processing apparatus according to claim 1 or 2, wherein the music data compressed by the compression means includes position information of performance start of the plurality of detected music data. The code information includes track numbers and index information related to all song data included in the storage medium,
When there is no silent time between the music data of n (n is a natural number) music data and n + 1 music data, the conversion means uses the track number and index information of the n + 1 music as the index information of the n music Converted,
The music data processing apparatus according to claim 1 or 2, wherein the music data compressed by the compression means includes the track number and index information of the nth music and the converted index information. Computer
Reading means for reading out the code information from a storage medium including a plurality of song data and code information,
Detecting means for detecting a plurality of song data in which no silence time exists between songs, from all the song data included in the storage medium, based on the read code information;
Conversion means for converting the code information so that the plurality of detected song data become a single song data;
Based on the converted code information, the plurality of detected music data are extracted from the storage medium and compressed in a predetermined compression format, and the reproduction is performed to reproduce the music data compressed by the compression means. A control program that functions as a means. Computer
Reading means for reading out the code information from a storage medium including a plurality of song data and code information,
Detecting means for detecting a plurality of song data in which no silence time exists between songs, from all the song data included in the storage medium, based on the read code information;
Conversion means for converting the code information so that the plurality of detected song data become a single song data;
Based on the converted code information, the plurality of detected music data are extracted from the storage medium and compressed in a predetermined compression format, and the reproduction is performed to reproduce the music data compressed by the compression means. A computer-readable recording medium in which a program for functioning as a means is recorded.

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