JP2005190571A - Reproduction processing method for mp3 system audio data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproduction processing method for MP3 system audio data which can output this audio data as quickly as possible when judged as audio data for the MP3 even if ID3 tag information is long in reading a data area from its starting position without fail. <P>SOLUTION: When the audio data is read by initiating reproduction operation from the starting position for the data area in a muting state and the audio data is read, the audio data read is judged on whether or not it is compression-coded by the MP3 system. Only when its judgement result is the MP3, an address A<SB>2</SB>for the audio data transferring to an MP3 decoder or an address A<SB>1</SB>for the audio data requesting next read is captured at the time of its judgement. A reproduction mechanism 3 is reversed to positions B<SB>2</SB>, B<SB>1</SB>which are retreated toward an opposite direction from the direction for the reproduction for designated sectors from its captured addresses A<SB>2</SB>and A<SB>1</SB>, and the reproduction operation is resumed after releasing the muting state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reproduction processing method for reading a recording medium recorded in a data format arranged in the order of ID3 tag information and audio data compressed and encoded by the MP3 method from the head of the data area from the head of the data area. .

  In recent years, as digital data such as music has become widely available, an audio compression technique represented by the MP3 (MPEG Audio Layer-3) system has attracted attention as a data format for storing music as digital data. Has been. This MP3 system is one of the compression encoding systems for music data standardized by the MPEG (Motion Picture Experts Group), which is a global standard for image information compression. When this MP3 system is used, the capacity is restored. Although it can be compressed to about one tenth of the capacity of the CD player, it has a characteristic that a good sound quality equivalent to that of a music CD can be obtained when played back by a music playback device such as an MP3 DVD player.

  The MP3 audio data can be obtained, for example, by using a personal computer or the like to encode music data recorded on a music CD based on predetermined conversion software. It can also be obtained when the user downloads from a predetermined music distribution site. The user creates a recording medium such as an original audio CD or CD-ROM by writing the MP3 music data obtained as described above onto a recording medium such as a CD-R. Can do.

  However, the MP3 system is a format for compressing music data, and is not designed to hold character information such as a song name or artist name of the music data. Therefore, in order to store such character information together with music data in a recording medium, a data format for recording attached character information such as song name, artist name and album name in the data area provided at the top of the MP3 file Has been proposed. The attached character information recorded in this data format is called ID3 tag information.

  The ID3 tag information is character information added mainly for the purpose of confirming the contents using a personal computer or the like, and is not required for reproduction when music data is reproduced by a music reproduction device such as an MP3 DVD player. It is a thing. However, in the music reproducing apparatus that reproduces the recording medium of the data format in which the ID3 tag information is recorded at the head of the data area, the reproduction of the ID3 tag information is not necessary as described above, but the head of the data area is not reproduced. Since the mechanism automatically reads from the ID3 tag information, a wasteful waiting time is generated until the reading of the ID3 tag information is completed.

On the other hand, conventionally, whether or not to read ID3 tag information added to music data compressed and encoded by the MP3 method is arbitrarily designated, and when it is designated that reading is not required, reproduction of music data is started immediately. An audio playback apparatus has been proposed (see, for example, Patent Document 1). Conventionally, an in-vehicle playback device has also been proposed in which it is determined whether or not the type information is MP3 format music data and a desired music data can be played back by an easy operation (for example, a patent). Reference 2).
JP 2002-245720 A JP 2001-266470 A

  In a conventional music reproducing apparatus that reproduces a recording medium having a data format in which ID3 tag information is recorded at the head of the data area, the muting state is set so that no audio signal is output, and the ID3 tag information at the head of the data area is used. When the reproduction operation is started and the music data is read out, it is determined whether or not the music data is compression-encoded music data by the MP3 system. After returning to, the muting state is canceled and the mechanism starts reading from the ID3 tag information again.

On the other hand, in the former audio reproduction apparatus, the ID3 tag information is designated to read or not to read the ID tag information for the recording medium of the data format added to the data area at the end of the MP3 file. When reproducing a recording medium having a data format in which the tag information is recorded at the head of the data area, it is impossible to solve the problem that a wasteful waiting time until the reading of the ID3 tag information is finished. Therefore, in particular, when the size data of the ID3 tag information is long, the waiting time until the music data is output after the user designates the reproduction becomes long. Is intended to be able to reproduce desired music data from a recording medium in which music data is hierarchized in units of folders with an easy operation. Even if the ID3 tag information recorded at the beginning of the song is long, it cannot be used for the purpose of shortening the waiting time until the music data is output in the music player that always plays from the beginning of the data area. .

  The present invention has been made in view of the above-described conventional problems, and in a music playback apparatus that always reads from the head of the data area, even if the ID3 tag information is long, it is determined that the data is MP3 audio data. It is an object of the present invention to provide an MP3 audio data reproduction processing method that can output the audio data as quickly as possible.

  In order to achieve the above object, an MP3 audio data reproduction processing method according to the first aspect of the present invention provides a recording medium having a data format recorded in the order of ID3 tag information and audio data from the beginning of a data area. When playback processing is started from the beginning of the data area, when the playback operation is started to read from the beginning of the data area in the muting state and the voice data is read, the read voice data is compressed and encoded by the MP3 method. Only when the determination result is the MP3 system, the address of the audio data transferred to the MP3 decoder at the time of the determination is acquired, and the playback direction and the playback direction are determined from the acquired address. Returns the playback mechanism to a position that has been retracted by a predetermined sector in the reverse direction, cancels the muting state, and then starts the playback operation. It is characterized in that opening.

  According to a second aspect of the present invention, there is provided an MP3 audio data reproduction processing method in which the reproduction mechanism is returned to a position retracted by 40 to 50 sectors in the direction opposite to the reproduction direction from the address obtained in the first aspect. .

  According to a third aspect of the present invention, there is provided an MP3 audio data reproduction processing method for reproducing a recording medium having a data format recorded in the order of ID3 tag information and audio data from the beginning of the data area from the beginning of the data area. At the time, when the audio data is read by starting the reproduction operation to read from the head of the data area in the muting state, it is determined whether or not the read audio data is compressed and encoded by the MP3 system. However, only when the determination result is the MP3 system, the address of the audio data requested to be read next is acquired at the time of the determination, and only a predetermined sector in the direction opposite to the reproduction direction is acquired from the acquired address. The reproduction mechanism is returned to the retracted position and the reproduction operation is resumed after the muting state is released.

  According to a fourth aspect of the present invention, there is provided a reproduction processing method for MP3 audio data, wherein the reproduction mechanism is returned to a position retracted by 130 sectors in the direction opposite to the reproduction direction from the address obtained in the third aspect of the invention.

  According to a fifth aspect of the present invention, there is provided an MP3 audio data reproduction processing method for reproducing a recording medium having a data format recorded in the order of ID3 tag information and audio data from the beginning of the data area from the beginning of the data area. In the muting state, the reproduction operation is started from the beginning of the data area, the size data of the ID3 tag information recorded at the beginning of the ID3 tag information is obtained, and the reproduction direction is performed for the size data of bytes. The address of the position advanced to the side is calculated, the playback mechanism is advanced so as to jump to the calculated address, the playback operation is resumed, and when the audio data is read out by the playback operation, the audio data is MP3 format Whether or not it is compression-encoded by the The back of the playback mechanism to address, is characterized by resuming the reproduction operation after releasing the muting state.

  According to the first aspect of the present invention, when it is determined that the audio data is of the MP3 system, the data is reproduced at a position backward in the direction opposite to the reproduction direction by a predetermined sector with reference to the address of the audio data transferred to the MP3 decoder. Since the reproduction operation is resumed after returning the mechanism, the position at which the reproduction operation is resumed can be accurately set at the end of the ID3 tag information by the predetermined number of sectors calculated from the acquired address. Compared with the case where the ID3 tag information is read again from the beginning when it is determined that the audio data is compression-encoded by the method, the audio data starts to be output from the time when it is determined that the audio data is the MP3 method. Can be shortened. In particular, in a recording medium on which long ID3 tag information is recorded, the silent state from when the user performs a reproduction instruction operation until sound is output can be significantly shortened. In addition, since the address of the audio data transferred to the MP3 decoder when it is determined to be MP3 format audio data is an address close to the beginning of the audio data in time series, the distance for returning the playback mechanism is shortened. It can be set, and the time until voice data starts to be output can be further shortened.

  In the invention of claim 2, when it is determined that the audio data is of the MP3 system, the audio data address transferred to the MP3 decoder when the audio data is determined as a reference is surely on the near side with respect to the head of the audio data and as much as possible. The number of sectors for returning to the end position of the ID3 tag information close to the ID is experimentally obtained in advance, so that there is no possibility that the audio data is output from the middle by skipping the head portion.

  According to the third aspect of the present invention, when it is determined that the audio data is the MP3 format, the data is reproduced at a position backward from the reproduction direction by a predetermined sector with reference to the address of the audio data requested to be read next. Since the reproduction operation is resumed after returning the mechanism, the position at which the reproduction operation is resumed can be accurately set at the end of the ID3 tag information by the predetermined number of sectors calculated from the acquired address. Compared with the case where the ID3 tag information is read again from the beginning when it is determined that the audio data is compression-encoded by the method, the audio data starts to be output from the time when it is determined that the audio data is the MP3 method. Can be shortened. In particular, in a recording medium on which long ID3 tag information is recorded, the silent state from when the user performs a reproduction instruction operation until sound is output can be significantly shortened.

  According to the fourth aspect of the present invention, when it is determined that the audio data is of the MP3 system, the address of the audio data requested to be read next is used as a reference, and the front side of the audio data is surely on the near side as much as possible. The number of sectors for returning to the end position of the ID3 tag information close to the ID is experimentally obtained in advance, so that there is no possibility that the audio data is output from the middle by skipping the head portion.

  According to the fifth aspect of the present invention, only the first size data is read out from the ID3 tag information. After the reading is completed, the audio data is reproduced by jumping to the first address of the audio data. When it is determined that the audio data is compression-encoded, the audio data reproduction operation is resumed by returning to the first address of the audio data, so that the reading time of the ID3 tag information can be shortened as much as possible, and MP3 Since the distance to return the playback mechanism from the time when it is determined that the audio data is of the format is extremely short, the time from the start of playback to the start of audio data output can be shortened as much as possible. It is possible to eliminate the silent state from when the operation is performed until the sound is output, and the sound data is output from the middle by skipping the head part. There is no possibility that the kind of problems will be caused.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a music reproducing apparatus for embodying a reproduction processing method for MP3 audio data according to the first embodiment of the present invention. In this embodiment, an MP3 DVD player is shown. Is illustrated. This MP3 DVD player has a mechanism for reproducing the recording medium 1 having a data format recorded in the order of ID3 tag information and audio data from the head of the data area from the head of the data area.

  In FIG. 1, recorded data is read by an optical pickup 3 while the recording medium 1 is rotated by a spindle motor 2. The pickup 3 is moved in the radial direction of the recording medium 1 by a tracking motor 4. The tracking motor 3 and the spindle motor 2 are rotationally controlled by a servo control system 7.

  The pickup 3 sends an RF signal, which is recording data read based on the intensity of reflected light from the recording medium 1, to the digital signal processing unit 8. The digital signal processing unit 8 performs signal processing for converting the RF signal into digital data, and outputs the digital data after performing error correction and the like. The digital data output from the digital signal processing unit 8 is sequentially sent to the buffer memory 9 and temporarily stored.

  The system controller 10 controls the entire apparatus based on various command signals input from the operation unit 11 by user key operations. That is, the CPU 12 of the system controller 10 receives various command signals from the operation unit 11 via the back-end processing unit 13 and reads various control programs and application programs of MP3 audio data stored in the ROM 14. In addition, various processes are executed by temporarily storing them in the program storage area in the RAM 17, and various data generated during this process are temporarily stored in the RAM 17.

  For example, when the CPU 12 receives a reproduction command signal from the back-end processing unit 13, the CPU 12 sequentially designates a required address to the front-end processing unit 18 and makes a read request for the recording medium 1. The front-end processing unit 18 controls the servo control system 7 based on the address requested to be read, and sequentially reads out the digital data temporarily recorded in the buffer memory 9 by designating the address. The digital data read from the buffer memory 9 is sent to the MP3 decoder 19, where the MP3 decoder of the input digital data is decompressed and encoded into the original signal. To do. The decoded digital data is converted to analog data by the D / A converter 20 and is output as a reproduced audio signal from the audio output terminal 21 to a speaker, earphone or headphone (not shown).

  The music reproducing device has a mechanism for reading from the beginning of the data area of the recording medium 1 as described above, and the reading operation is started by setting the muting unit 19a in the MP3 decoder 19 to the on state. The The muting state is set in this way because the music reproducing apparatus also targets the recording medium 1 on which data in a file format other than the MP3 format is recorded, so that the MP3 follows the ID3 tag information. This is to prevent abnormal noise from being output when data in a file format other than the system is reproduced.

  The MP3 decoder 19 is readable when the audio data read out and inputted from the buffer memory 9 is digital data that can be decoded, that is, digital data compressed and encoded by the MP3 method. Set a flag to indicate. When the CPU 12 determines that the flag is set via the back-end processing unit 13, the CPU 12 determines that the audio data is compression-encoded by the MP3 method, and sets the MP3 decoder 19 for the back-end processing unit 13. The muting unit 19a is instructed to cancel the off state, that is, the muting state.

  Next, the control processing of the CPU 12 in the MP3 audio data reproduction processing method of the first embodiment will be described with reference to the flowchart of FIG. 2 and the operation explanatory diagram of FIG. In FIG. 2, the CPU 12 waits for the reproduction command signal from the operation unit 11 to be input via the back end processing unit 13 (step S1). When the reproduction command signal is input, the CPU 12 A command is issued to start reading of the recording medium 1 (step S2). Receiving this read command, the front end processing unit 18 controls the rotation of the spindle motor 2 and the tracking servo motor 4 via the servo control system 7. As a result, the pickup 3 reads the recording data from the head of the data area of the recording medium 1 while being moved radially outward from the innermost circumference of the recording medium 1, and performs digital signal processing on the read RF signal. Send to part 8. The digital signal processing unit 8 converts the RF signal into digital data and outputs it, and the digital data is sequentially sent to the buffer memory 9 and temporarily stored.

  As described above, when the reproduction operation of the recording medium 1 is started and digital data is temporarily stored in the buffer memory 9, the front end processing unit 13 sequentially designates the digital data from the buffer memory 9 by designating from the head address. Read and input to the MP3 decoder 19. In this reproduction operation, as shown in FIG. 3, reading is started from the head of the ID3 tag information recorded in the innermost circumference of the data area of the recording medium 1, and reading of the audio data is started after the reading of the ID3 tag information is completed. It is done in the procedure to.

  When the reproduction operation is started, the CPU 12 monitors whether the audio data is read from the buffer memory 9 through the front-end processing unit 18 (step S3), and determines that the audio data has been read. Based on the determination as to whether or not the flag is set in the MP3 decoder 19 through the processing unit 13, it is determined whether or not the reproduced audio data is compression-coded by the MP3 method (step S4). That is, the CPU 12 determines whether or not the reproduced audio data has been compressed and encoded by the MP3 method depending on whether or not the MP3 decoder 19 can decode the audio data. However, MP3 data decoded by the MP3 decoder 19 at this time is prevented from being output when the muting unit 19a of the MP3 decoder 19 is set to ON.

  When the CPU 12 determines that the reproduced audio data is compressed and encoded by the MP3 method, the CPU 12 acquires the address that the front-end processing unit 18 requests to read from the servo control system 7 at the time of the determination. (Step S5) Immediately thereafter, the front end processing unit 18 is instructed to stop the reproduction operation (Step S6). Subsequently, the CPU 12 causes the pickup 3 to be accessed at a position retracted by 130 sectors in the direction opposite to the reproduction direction from the acquired address in the recording medium 1, and then resumes the reproduction operation from the accessed position. The front end processing unit 18 is instructed (step S7).

To describe a series of control processing described above with reference to FIG. 3, to start the reading operation from the head of the data area, after stopping the reading operation when it obtains the address A ₁ described above, from the address A ₁ A position B ₁ that is 130 sectors backward in the direction opposite to the reproduction direction is accessed, and the read operation is resumed from the accessed position B ₁ . In the above access, since a unique address is usually assigned to each sector, the address of the position B ₁ that is backward by 130 sectors from the acquired address A _{1 in the} direction opposite to the reproduction direction is obtained by calculation. The procedure is performed in which the pickup 3 is moved to the determined address.

By the way, the above-mentioned 130 sectors were obtained experimentally, and from the address A ₁ acquired as described above, it is surely on the side opposite to the reproduction direction from the start address of the audio data, and the audio as much as possible. This is the number of sectors until the position B ₁ close to the head address of the data. Thus, when resuming the reproduction operation from the position B ₁ represents can be reliably read out the audio data recorded from the beginning of this.

The CPU 12 gives a command for restarting the reading operation after accessing the position B ₁ to the front end processing unit 18 and at the same time commands the muting unit 19 a of the MP3 decoder 19 to be turned off via the back end processing unit 13. (Step S8). Therefore, as shown in FIG. 3, when the first audio data is read out by restarting the reproduction operation from the position B ₁ , the audio data is decoded by the MP3 decoder 19 at t ₁ . It is converted into an analog signal by the D / A converter 20 and output from the audio output terminal 21 (step S9).

  Note that when the CPU 12 determines that the read audio data is not compressed and encoded by the MP3 system (step S4), the CPU 12 notifies the user that the audio data is not MP3 system audio data (step S10).

In the above playback processing method, playback is started from the end position of the ID3 tag information that is returned in the direction opposite to the playback direction by a predetermined sector from the next read-requested address when it is determined as MP3 format audio data. Since the operation is resumed, when it is determined that the audio data is compression-encoded by the MP3 method as in the prior art, the playback operation is resumed by returning to the head position of the data area and the ID3 tag information is read from the beginning. In comparison, the time from when it is determined that the audio data is MP3 format until the audio data starts to be output is considerably shortened. In particular, when reproducing the recording medium 1 on which long ID3 tag information is recorded, the silence state from when the user operates the reproduction instruction with the operation unit 11 until the sound is output is remarkably shortened. Can do. Moreover, in the above reproduction processing method, the number of sectors for returning to the position B ₁ that is surely opposite to the reproduction direction from the start address of the audio data and is as close as possible to the start address of the audio data is experimentally determined in advance. Therefore, there is no possibility that the audio data skips the head portion and is output from the middle.

  FIG. 4 is a flowchart showing the control processing of the CPU 12 in the second embodiment of the present invention, and the reproduction processing method of this embodiment is also embodied by being applied to the music reproducing device of FIG. The description of FIG. 4 will be made using the reference numerals of the constituent elements 1. In steps S11 to S14 in FIG. 4, the same processing as in steps S1 to S4 in FIG. 2 is performed, and therefore, a duplicate description is omitted and the processing from step S15 will be described.

  When the CPU 12 determines that the reproduced audio data is compression-encoded by the MP3 method (step S14), the CPU 12 reads the audio data read from the buffer memory 9 and transferred to the MP3 decoder 19 at the determination time. The address is acquired via the front end processing unit 18 (step S15), and immediately thereafter, the front end processing unit 18 is instructed to stop the reproduction operation (step S16). Subsequently, the CPU 12 causes the pickup 3 to access a position that is back by 40 sectors in the direction opposite to the reproduction direction from the acquired address in the recording medium 1, and then resumes the reproduction operation from the accessed position. The front end processing unit 18 is instructed (step S7).

The above-described series of processing will be described with reference to FIG. 5. After starting the read operation from the beginning of the data area and stopping the read operation when the above address A ₂ is acquired, the playback direction is reversed from the address A _2. The position B ₂ that has been moved backward by 40 sectors in the direction is accessed, and the read operation is resumed from the accessed position B ₂ . The access is performed in accordance with a procedure in which the address of the position B ₂ that has been moved backward by 40 sectors with respect to the acquired address A ₂ is obtained by calculation, and the pickup 3 is moved to the obtained address.

By the way, the above-mentioned 130 sectors were obtained experimentally, and the address A ₂ obtained as described above is surely on the side opposite to the playback direction from the start address of the audio data, and as much as possible. This is the number of sectors until the position B ₂ close to the head address of the data. Thus, when resuming the reproduction operation from the position B ₂ can be reliably read out the audio data recorded from the beginning of this.

The CPU 12 gives a command to resume the reading operation after accessing the position B ₂ to the front end processing unit 18 and at the same time commands the muting unit 19a of the MP3 decoder 19 to be turned off via the back end processing unit 13 ( Step S18). Therefore, as shown in FIG. 5, at the time t ₂ when the reproduction operation is resumed from the position B ₂ and the first audio data is reproduced, the audio data read out and decoded by the MP3 decoder 19 is obtained. Is output from the MP3 decoder 19 and converted into an analog signal by the D / A converter 20, and then output from the audio output terminal 21 (step S19).

  Note that when the CPU 12 determines that the read audio data is not compression-coded by the MP3 method (step S14), the CPU 12 notifies the user that the audio data is not MP3 audio data (step S20).

  In this reproduction processing method, at the time when it is determined that the data is MP3 audio data, the end of the ID3 tag information returned from the address of the audio data being transferred to the MP3 decoder 19 by a predetermined sector in the direction opposite to the reproduction direction. Since the reproduction operation is resumed from the position, when it is determined that the audio data is compression-encoded by the MP3 method as in the prior art, the reproduction operation is resumed by returning to the start position of the data area and the ID3 tag information is changed from the beginning. Compared with the case of reading, the time from when it is determined that the audio data is MP3 format to when the audio data starts to be output is considerably shortened. In particular, when reproducing the recording medium 1 on which long ID3 tag information is recorded, the silence state from when the user operates the reproduction instruction with the operation unit 11 until the sound is output is remarkably shortened. Can do.

Further, in the above reproduction processing method, the number of sectors for returning to the position B ₂ that is surely opposite to the reproduction direction from the start address of the audio data and is as close as possible to the start address of the audio data is experimentally determined in advance. Therefore, there is no possibility that the audio data skips the head portion and is output from the middle.

Moreover, as is apparent from the comparison between FIG. 5 and FIG. 3, in the first embodiment, when it is determined that the audio data is compression-coded by the MP3 method, the front-end processing unit 7 next reads the read request. The playback operation is started from the position B ₁ which is returned by a predetermined number of sectors with the address A _{1 being used} as a reference, but in this embodiment, it is determined that the audio data is compressed and encoded by the MP3 method. Thus, the reproduction operation is started from the position B ₁ which is returned by a predetermined number of sectors with the address A ₂ of the audio data being transferred to the MP3 decoder 19 as a reference.

That is, since the address A ₂ acquired in this embodiment is the time point earlier in time series than the address A ₁ acquired in the _first embodiment, in this embodiment, the beginning of the audio data The number of sectors (40 sectors in the embodiment) for returning to the position B ₂ which is surely opposite to the reproduction direction from the address and is as close to the start address of the audio data as possible is the same as in the first embodiment. Since the number is smaller than the number of sectors (130 sectors in the embodiment), the distance to return the pickup 3 is shorter than in the first embodiment, and the time from the start of reproduction until the start of output of audio data is further increased. There is an advantage that it can be shortened.

  FIG. 6 is a flowchart showing the control processing of the CPU 12 in the third embodiment of the present invention, and the reproduction processing method of this embodiment is also embodied by being applied to the music reproducing device of FIG. The description of FIG. 6 will be made using the reference numerals of the constituent elements 1. In FIG. 6, the CPU 12 waits for the reproduction command signal from the operation unit 11 to be input via the back end processing unit 13 (step S <b> 21), and when the reproduction command signal is input to the front end processing unit 18. A command to start reading the recording data of the recording medium 1 is issued (step S22).

  The CPU 12 obtains size data indicating the length of the ID3 tag information recorded in the head of the ID3 tag information to the front end processing unit 18 immediately after instructing the start of the reproduction operation of the recording medium 1 described above. To do. Receiving this command, the front-end processing unit 18 extracts the size data from the reproduction data sent from the pickup 3 to the buffer memory 9 via the digital signal processing unit 8 and outputs it to the CPU 12. Thereby, CPU12 acquires the size data of ID3 tag information (step S23).

  Subsequently, the CPU 12 performs an operation for obtaining the address of the position advanced in the reproduction direction by the byte of the acquired size data, that is, the first address of the audio data, and resumes the reproduction operation from the position jumped to the calculated address. The front end processing unit 18 is instructed to do so. Thereby, the front end processing unit 18 controls the servo control system 7 to interrupt the reproduction operation of the ID3 tag information and restart the reproduction operation from the address received from the CPU 12. As a result, the pickup 3 interrupts the reading operation when only the top size data of the ID3 tag information is read, and restarts the reproducing operation of skipping the data area of the ID3 tag information and reading the audio data from the top (step). S24).

  Next, the CPU 12 determines whether or not the reproduced audio data is compression-coded by the MP3 method based on whether or not the flag is set in the MP3 decoder 19 through the back-end processing unit 13 (step S25). . When the CPU 12 determines that the reproduced audio data is compressed and encoded by the MP3 method, the CPU 12 instructs the front end processing unit 18 to stop the reproduction operation (step S26), and then The address acquired by the calculation is accessed, and the reproduction operation is instructed to resume from the accessed position (step S27). At this time, the MP3 format data decoded by the MP3 decoder 19 is prevented from being output by the muting unit 19a of the MP3 decoder 19.

  The CPU 12 commands the muting unit 19a of the MP3 decoder 19 to be turned off via the back-end processing unit 13 after commanding the resumption of the reproducing operation (step S28). Thus, when the reproduction operation is resumed and the first audio data is read out, the audio data that has been read out and decoded by the MP3 decoder 19 is output from the MP3 decoder 19 to be output from the D / A converter. After being converted into an analog signal at 20, it is output from the audio output terminal 21 (step S 29).

  Note that when the CPU 12 determines that the read audio data is not compression-encoded in the MP3 format (step S25), the CPU 12 notifies the user that the audio data is not MP3 format audio (step S30).

  In this reproduction processing method, the first address of the data area of the audio data is calculated based on the size data read from the head of the ID3 tag information, and the reproduction of the audio data is started by skipping to the calculated address. When it is determined that the audio data is compression-encoded by the MP3 method, the playback operation of the audio data is resumed by returning to the calculated address. Therefore, only the top size data of the ID3 tag information is returned. Since the playback operation of the voice data is resumed immediately after returning to the first address of the voice data when it is determined that the voice data is compressed and encoded by the MP3 method, the ID3 tag Since information is hardly read, the time from the start of reproduction until the start of output of audio data is the second embodiment. It is possible to eliminate the silent state from when the user performs a playback instruction using the operation unit until the sound is output, and the audio data is skipped from the beginning and output from the middle. There is no risk of malfunction.

  When audio CDs and CD-ROMs created by users as their original recording media are played back by a music playback device, it is possible to ensure that the audio data is output from the middle by skipping the beginning. While being prevented, the silent state from when the user performs a playback instruction operation until sound is output can be significantly shortened.

It is a block block diagram which shows the music reproduction apparatus which embodies the reproduction | regeneration processing method of the MP3 system audio | voice data based on the 1st Embodiment of this invention. It is a flowchart which shows the control processing of CPU in embodiment same as the above. It is operation | movement explanatory drawing of embodiment same as the above. It is a flowchart which shows the control processing of CPU in the 2nd Embodiment of this invention. It is operation | movement explanatory drawing of embodiment same as the above. It is a flowchart which shows the control processing of CPU in the 3rd Embodiment of this invention.

Explanation of symbols

1 Recording medium 3 Pickup (playback mechanism)
10 System controller 19 MP3 decoder 19a Muting section

Claims (5)

When reproducing a recording medium having a data format recorded in the order of ID3 tag information and audio data from the beginning of the data area from the beginning of the data area,
When the audio data is read by starting the reproduction operation to read from the beginning of the data area in the muting state, it is determined whether or not the read audio data is compression-coded by the MP3 system.
Only when the determination result is the MP3 system, the address of the audio data transferred to the MP3 decoder at the time of the determination is acquired,
MP3 audio data reproduction characterized by returning the reproduction mechanism to a position retracted by a predetermined sector in the direction opposite to the reproduction direction from the acquired address and resuming the reproduction operation after releasing the muting state Processing method.   2. The reproduction processing method of MP3 audio data according to claim 1, wherein the reproduction mechanism is returned to a position retracted in a direction opposite to the reproduction direction by 40 to 50 sectors from the acquired address. When reproducing a recording medium having a data format recorded in the order of ID3 tag information and audio data from the beginning of the data area from the beginning of the data area,
When the audio data is read by starting the reproduction operation to read from the beginning of the data area in the muting state, it is determined whether or not the read audio data is compression-coded by the MP3 system.
Only when the determination result is the MP3 system, the address of the audio data requested to be read next is acquired at the time of the determination,
MP3 audio data reproduction characterized by returning the reproduction mechanism to a position retracted by a predetermined sector in the direction opposite to the reproduction direction from the acquired address and resuming the reproduction operation after releasing the muting state Processing method.   4. The MP3 audio data reproduction processing method according to claim 3, wherein the reproduction mechanism is returned to a position retracted in a direction opposite to the reproduction direction by 130 sectors from the acquired address. When reproducing a recording medium having a data format recorded in the order of ID3 tag information and audio data from the beginning of the data area from the beginning of the data area,
In the muting state, the reproduction operation is started from the head of the data area, and the size data of the ID3 tag information recorded at the head of the ID3 tag information is acquired.
Calculate the address of the position advanced in the playback direction by the size data bytes,
Whether or not the audio data is compressed and encoded by the MP3 method when the reproduction operation is restarted after the reproduction mechanism is advanced to jump to the calculated address and the audio data is read by the reproduction operation. Determine whether
Only when the determination result is the MP3 system, the playback mechanism is returned to the calculated address, and the playback operation is resumed after releasing the muting state. .

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