JP2005085337A - Device and method for compressed data reproduction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressed data reproduction device which quickly performs reproduction from a position where the reproduction is stopped when the reproduction is started again after the reproduction is stopped. <P>SOLUTION: The device is provided with a reproduction part 3 which decompresses compressed data for reproducing a file, a positional information detection part 4 for detecting positional information showing a data position where the reproducing operation of the reproduction part 3 is stopped in the case of stopping the reproducing operation of the reproduction part 3, a positional information recording part 5 for holding the positional information detected by the detection part 4, and a disk analysis part 2 for performing disk analysis. In a state where the recording part 5 does not hold the positional information, the reproduction part 3 starts reproducing operation after the analysis part 2 performs disk analysis. In a state where the recording part 5 holds the positional information, the reproduction part 2 starts the reproducing operation from the data position shown by the positional information, and the analysis part 2 performs disk analysis within a period in which the reproducing operation of the reproduction part 3 is performed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressed data reproducing apparatus and a compressed data reproducing method, and more particularly to a compressed data reproducing apparatus and a compressed data reproducing method for reproducing compressed data recorded on an optical disc such as a CD (Compact Disc).

  There are CD-ROM, CD-R, CD-RW, Video-CD, and the like as optical disks for recording compressed data such as sound. Although these have the feature that the recorded information can be randomly accessed, unlike the tape recording medium, the position information at the time of the reproduction stop is lost when the reproduction is stopped.

  For this reason, some compressed data reproducing apparatuses that reproduce compressed data recorded on a CD or the like include a resume function for resuming reproduction from a position where reproduction was previously stopped (see, for example, Patent Document 1). ).

  The operation procedure of the conventional compressed data reproducing apparatus will be described with reference to FIGS. 8 and 9 are flowcharts showing the operation procedure of the conventional compressed data reproducing apparatus. FIG. 8 shows an operation procedure when playback is stopped (at the time of transition to the standby state), and FIG. 9 shows a case where playback is resumed after playback is stopped by the operation procedure shown in FIG. 8 (at the time of resume operation). The operation procedure is shown.

  First, the operation procedure when the conventional compressed data reproducing apparatus shifts to the standby state will be described with reference to FIG.

  First, a CD is loaded on the disk table (S101). Next, the CD analysis of the CD is performed (S102). Disk analysis data is obtained by this disk analysis. The compressed data forms a directory / file structure and is recorded on the CD. The disk analysis data is directory information or file information of this directory / file structure.

  Next, the MSF value corresponding to the head address is calculated from the head address of the file to be reproduced (S103). Then, reproduction of a file is started using this MSF value (S104). Here, the MSF value is position information indicating a position where data is recorded on the signal recording surface of the CD. This MSF value has a unit of time of “minute, second, frame”.

  Next, it is determined whether or not to shift to the standby state (S105). If it is determined not to shift to the standby state, the process returns to step S104 to continue the reproduction. On the other hand, if it is determined to shift to the standby state, the address of the data being reproduced at the time of determination is detected and the address is held (S106). Here, the address is position information indicating a data position in the directory / file structure. After this address is detected, standby processing for shifting to the standby state is performed, and CD reproduction is stopped (S107).

  Next, the operation procedure during the resume operation of the conventional compressed data reproducing apparatus will be described with reference to FIG.

First, CD disc analysis is performed (S201). Next, referring to the obtained disk analysis data, an MSF value corresponding to the address held in step S106 is calculated (S202). Then, the reproduction of the CD is resumed from the data position corresponding to the MSF value (S203).

  Next, it is determined whether or not to end the reproduction (S204). If it is determined not to end the reproduction, the process returns to step S203 to continue the reproduction. On the other hand, if it is determined that the reproduction is to be terminated, a reproduction termination process is performed (S205).

The conventional compressed data reproducing apparatus described above realizes the resume function by holding the address of the data reproduced at the time of transition to the standby state.
JP 2002-245709 A (2nd page, FIG. 3)

  However, in the conventional compressed data reproducing apparatus, an address is used for position information indicating the data position of data reproduced at the time of transition to the standby state. The address does not directly indicate the position where the data is recorded on the signal recording surface of the CD. Therefore, when resuming playback from the data that was previously played back using the address, it is necessary to perform disk analysis prior to playback and calculate the MSF value corresponding to the address from the obtained disk analysis data. .

  For this reason, the conventional compressed data reproducing apparatus has a problem that it takes time until the reproduction is started after an instruction to perform the resume operation is issued for the time required for the disk analysis.

  The present invention has been made based on the above background, and provides a compressed data reproducing apparatus and a compressed data reproducing method for quickly reproducing from a position where reproduction is stopped when reproduction is stopped and then reproduction is resumed. The purpose is to do.

  To achieve the above object, a compressed data reproducing apparatus according to the present invention generates compressed data from an input RF signal, reproduces the compressed data and reproduces a file, and the reproducing means reproduces the file. When stopping the operation, the position information detecting means for detecting the position information indicating the data position where the reproduction operation is stopped, the position information recording means for holding the position information detected by the position information detecting means, and disc analysis In a first state in which the position information recording means does not hold the position information, the reproducing means starts a reproducing operation after the disk analyzing means performs the disk analysis. In the second state where the position information recording means holds the position information, the reproduction means reproduces the file from the data position indicated by the position information. In the second state, after the reproduction means starts the file reproduction operation from the data position indicated by the position information, the reproduction operation of the file for which the reproduction operation has been started is The disc analyzing means performs disc analysis within a period until the end of the disc.

The compressed data reproducing apparatus according to the present invention generates compressed data from an input RF signal, decompresses the compressed data, and reproduces a plurality of files in a predetermined order, and the reproducing means When the reproduction operation is stopped, first position information detection means for detecting first position information indicating the data position at which the reproduction operation is stopped; and when the reproduction means stops the reproduction operation, the reproduction operation is Second position information detecting means for detecting second position information indicating the first data position of each of N files (N is a natural number) reproduced in the predetermined order next to the file to be stopped; The position information recording device comprises: position information recording means for holding the first and second position information detected by the first and second position information detection means; and disk analysis means for performing disk analysis. In the first state where the stage does not hold the first and second position information, the reproducing means starts the reproducing operation after the disk analyzing means performs the disk analysis, and the position information recording means In the second state in which the first position information and the second position information are held, the reproduction means starts the file reproduction operation from the data position indicated by the first position information, and this reproduction operation is started. After the file playback operation is finished, the playback means plays back the N files to be played back in the predetermined order after the file for which the playback operation has started, in the predetermined order, and the second In this state, after the reproduction means starts the file reproduction operation from the data position indicated by the first position information, the predetermined order is next to the file for which the reproduction operation is started. The reproducing operation of said N files Oite reproduced within a period of up to the playback unit is completed, the disk analysis means is characterized by performing disk analysis.

  Furthermore, the compressed data reproduction method according to the present invention includes a reproduction step for starting a file reproduction operation from the data position indicated by the position information, and the reproduction operation after starting the file reproduction operation from the data position in the reproduction step. And a disc analysis step for performing disc analysis within a period until the operation of starting the file for which the operation has been started is completed.

  Furthermore, in the compressed data reproduction method according to the present invention, the file reproduction operation is started from the data position indicated by the position information, and the reproduction operation is started after the file reproduction operation is started. A reproduction step of performing reproduction of N (N is a natural number) files reproduced in a predetermined order next to the file in the predetermined order, and a file reproduction operation from the data position indicated by the position information in the reproduction step A disk analysis step for performing disk analysis within a period from the start of playback to the end of the playback operation of the N files that are played back in the predetermined order after the file for which the playback operation has started; It is characterized by comprising.

  ADVANTAGE OF THE INVENTION According to this invention, when reproduction | regeneration is stopped and reproduction | regeneration is restarted after that, the compressed data reproduction | regeneration apparatus and compression data reproduction | regeneration method which reproduce rapidly from the position where reproduction | regeneration was stopped can be provided.

(First embodiment)
Hereinafter, a first embodiment of a compressed data reproducing apparatus and a compressed data reproducing method according to the present invention will be described with reference to FIGS.

  First, an outline of the configuration of the compressed data reproducing apparatus according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating a configuration of a compressed data reproducing apparatus according to the present embodiment.

  The reading unit 1 reads information recorded on an optical disc such as a CD as an RF signal. This RF signal is output to the disk analysis unit 2 and the reproduction unit 3.

  The disk analysis unit 2 performs disk analysis using the input RF signal. Then, disk analysis data is obtained by this disk analysis. The disk analysis data is directory information or file information of the file system recorded on the optical disk, and specifically, the number of bytes or address for each file.

The reproducing unit 3 generates compressed data from the input RF signal, and decompresses the compressed data to reproduce a file. The playback operation of the playback unit 3 is performed using disk analysis data obtained by disk analysis of the disk analysis unit 2 during normal playback processing.

  When the reproduction operation of the reproduction unit 3 is stopped (at the time of transition to the standby state), the position information detection unit 4 detects position information indicating a data position where the reproduction operation of the reproduction unit 3 is stopped. The position information recording unit 5 holds the position information detected by the position information detection unit 4.

  When the reproduction operation of the reproduction unit 3 is started, a different operation is performed depending on whether or not the position information recording unit 5 holds the position information. When the reproducing unit 3 starts the reproducing operation in a state where the position information recording unit 5 does not hold the position information, the reproducing unit 3 starts the reproducing operation after the disk analyzing unit 2 performs the disk analysis. On the other hand, when the reproducing unit 3 starts the reproducing operation while the position information recording unit 5 holds the position information (during the resume operation), the reading unit starts from the data position indicated by the position information held in the position information recording unit 5. Reference numeral 1 reads information recorded on the optical disc, and the reproducing unit 3 starts a file reproducing operation from the data position indicated by the position information. In addition, the disk analysis unit within a period from when the playback unit 3 starts the file playback operation from the data position indicated by the position information to when the playback unit 3 ends the playback operation of the file for which the playback operation has started. 2 performs disk analysis.

  Next, a specific configuration example of the compressed data reproducing apparatus according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating the configuration of the compressed data reproducing apparatus according to the present embodiment. In the following description, performance file data of a plurality of songs is taken as an example of compressed data. Further, as an example of data compression standard, MP3 (MPEG1 / 2 Audio Layer 3), which is one of audio data compression standards, will be described as an example. Further, the MSF value will be described as an example of position information.

  In CD6, performance file data of a plurality of songs is compressed and recorded in accordance with the MP3 data compression standard.

  The CD servo 7 controls the spindle motor 8, the slide motor 9, and the optical pickup 10 so as to perform predetermined operations. The spindle motor 8 rotates the CD 6. The slide motor 9 moves the optical pickup 10 in the radial direction of the CD 6 so that the optical pickup 10 can follow the reading of the CD 6. The optical pickup 10 collects and irradiates laser light on the signal recording surface of the CD 6, receives the reflected light, and outputs an RF signal to the head amplifier 11.

  The head amplifier 11 amplifies the RF signal detected by the optical pickup 10 and outputs it to the CD servo 7. The RF signal input to the CD servo 7 is converted into MP3 data which is compressed data by being converted into a digital signal by the CD servo 7 and demodulated by EFM (Eight to Fourteen Modulation). This MP3 data is output to the RAM 12.

  The RAM 12 is a memory mounted together with the DSP 13 in one semiconductor integrated circuit. During reproduction, the DSP 13 reads the MP3 data held in the RAM 12 and decompresses the read MP3 data to generate digital audio data. The generated digital audio data is output to the DAC 14 (digital / analog converter) via the RAM 12.

  The DAC 14 receives digital audio data from the DSP 13 and D / A converts the digital audio data into an analog audio signal. The analog audio signal is amplified by the amplifier 15 and supplied to the speaker 16, whereby the performance file data recorded on the CD 6 is reproduced.

  The MCU 17 controls the CD servo 7, RAM 12, and DSP 13. Further, a RAM 18 is connected to the MCU 17 so that the MCU 17 can perform read / write processing on the RAM 18. The RAM 18 is a nonvolatile memory and can store written data even when the power is turned off. Examples of the RAM 18 include a flash memory, an MRAM (Magnetic Random Access Memory), a ferroelectric memory, and a phase change memory.

  Next, the operation procedure of the compressed data reproducing apparatus according to the present embodiment shown in FIG. 2 will be described with reference to FIGS. 3 and 4 are flowcharts showing the operation procedure of the compressed data reproducing apparatus according to this embodiment. FIG. 3 shows an operation procedure when playback is stopped (at the time of transition to the standby state), and FIG. 4 shows a case where playback is resumed after playback is stopped by the operation procedure shown in FIG. 3 (at the time of resume operation). The operation procedure is shown.

  First, the operation procedure when the compressed data reproducing apparatus according to the present embodiment shifts to the standby state will be described with reference to FIG.

  First, the CD 6 is loaded on the disk table driven by the spindle motor 8 (S11).

  Next, the disk analysis of CD6 is performed as follows (S12). First, the optical pickup 10 is moved to the lead-in area located at the innermost periphery of the signal recording surface of the CD 6, and TOC (Table Of Contents) data recorded in the lead-in area is read. The TOC data indicates the head address of each track by an MSF (Min Sec Frame) value, and the MSF value is position information indicating the position where data is recorded on the signal recording surface of the CD6. This MSF value has a unit of time of “minute, second, frame”. Next, data is read by moving the optical pickup 10 to the volume descriptor and path table recorded subsequently to the outer peripheral side of the lead-in area. The read data is input to the DSP 13 via the CD servo 7, and the DSP 13 analyzes the data. By this data analysis, disk analysis data is obtained. This disk analysis data is held in the RAM 12.

  Next, the MSF value corresponding to the head address is calculated from the head address of the performance file to be reproduced (S13). Then, the optical pickup 10 is moved to a position corresponding to the MSF value, and reproduction is started from the beginning of the performance file to be reproduced (S14). At the time of reproduction, MP3 data is input from the CD servo 7 to the DSP 13 via the RAM 12, and the DSP 13 expands the MP3 data to generate digital audio data. The digital audio data is converted into an analog audio signal by the DAC 14.

  Next, it is determined whether or not to shift to a standby state (S15). If it is determined not to shift to the standby state, the process returns to step S14 to continue the reproduction. On the other hand, when it is determined to shift to the standby state, the CD servo 7 detects the MSF value of the data read from the CD 6 at the time of the determination. This MSF value is held in the RAM 18 via the MCU 17 (S16). That is, if it is determined to shift to the standby state, the MSF value of the data being reproduced at the time of the determination is held in the RAM 18.

  Next, standby processing for shifting to the standby state is started (S17). In step S17, the power sources of the CD servo 7, RAMs 12, 18, DSP 13, MCU 17, etc. are turned off. By this standby processing, the reproduction of the performance file is interrupted at the data position indicated by the MSF value held in the RAM 18.

  Subsequently, an operation procedure during the resume operation of the compressed data reproducing apparatus according to the present embodiment will be described with reference to FIG.

  When resumption of reproduction is instructed, the MSF value held in the RAM 18 in step S16 is read from the RAM 18 (S21). Then, the optical pickup 10 is moved to a position corresponding to the read MSF value, and the performance file whose reproduction is interrupted at the transition to the standby state is reproduced from the data position indicated by the MSF value (S22).

  Further, the disk analysis of CD6 is performed within the execution period of the reproduction processing operation in step S22 (S23). As a method for processing the reproduction process (S22) and the disk analysis process (S23) in parallel, the following methods are conceivable. First, data is read from the data position indicated by the MSF value held in the RAM 18, and the read MP3 data is expanded by the DSP 13, thereby storing a certain amount of digital audio data in the RAM 12. Then, while the digital audio data held in the RAM 12 is output to the DAC 14 in the order of the data stream, the volume descriptor and the path table are read, and the read data is analyzed by the DSP 13 to perform disk analysis. Do. Thus, the disk analysis process (S23) can be performed in parallel with the reproduction process (S22) without interrupting the sound output from the speaker 16.

  Next, normal reproduction processing is performed using the disk analysis data obtained in step S23 (S24). In step S24, the MSF value corresponding to the start address of the performance file to be reproduced next is calculated using the disc analysis data. Then, the optical pickup 10 is moved to a position corresponding to the calculated MSF value, and reproduction of the next performance file is started.

  Next, it is determined whether or not to end the reproduction (S25). If it is determined not to end the reproduction, the process returns to step S24 to continue the reproduction. On the other hand, if it is determined that the reproduction is to be terminated, a reproduction termination process is performed (S26).

  The compressed data reproducing apparatus according to the present embodiment described above holds the MSF value of the data reproduced at the time of the reproduction stop in the RAM 18 at the time of transition to the standby state, performs the CD6 disk analysis at the time of the resume operation, and the RAM 18 The data is reproduced from the data position indicated by the MSF value held in FIG. For this reason, the compressed data reproducing apparatus according to the present embodiment can reproduce quickly without waiting for the end of the disk analysis during the resume operation.

  Also, the compressed data reproducing apparatus according to the present embodiment uses the MSF value for the data position information. Since the amount of information of the MSF value is only 3 bytes, the burden on the RAM 18 for holding the position information can be reduced by using the MSF value for the position information.

  Furthermore, the compressed data reproducing apparatus according to the present embodiment uses the RAM 18 as a nonvolatile memory. For this reason, the standby power consumed by the RAM 18 can be deleted without losing the information on the MSF value held in the RAM 18 by turning off the power supply of the RAM 18 during standby. Further, the compressed data reproducing apparatus according to the present embodiment holds the MSF value in the RAM 18 instead of the RAM 12 and turns off the DSP 13 during standby. For this reason, standby power consumed by the DSP 13 can be reduced.

  In this embodiment, MP3 is described as an example of the data compression standard of the compressed data recorded on the CD 6, but the present invention is not limited to this.

  In the present embodiment, the RAM 18 is a non-volatile memory, but the RAM 18 may be a volatile memory. However, in this case, in order to hold the MSF value during standby, it is necessary to turn on the RAM 18 during standby.

  Furthermore, in this embodiment, the disk analysis is performed by the DSP 13, but the present invention is not limited to this. For example, disk analysis may be performed by the MCU 17.

  Furthermore, in this embodiment, the MSF value indicating the data position at which reproduction is resumed at the time of resume is used as the MSF value of the data read from the CD 6 at the transition to the standby state, but this MSF value is not limited to this. For example, the MSF value of the data decompressed by the DSP 13 at the time of transition to the standby state is detected, and this MSF value is held in the RAM 18. As a result, the MSF value indicating the data position at which reproduction is resumed at the time of resume can be used as the MSF value of the data decompressed by the DSP 13 at the transition to the standby state.

  Furthermore, in this embodiment, the MSF value of data read from the CD 6 at the time of transition to the standby state is held in the RAM 18, but the memory that holds this MSF value is not limited to the RAM 18. For example, the MSF value can be held by the RAM 12.

  Furthermore, in this embodiment, the position information is an MSF value, but the position information is not limited to the MSF value. Even when the position information is other than the MSF value, if the position where the data is recorded on the signal recording surface of the CD 6 can be directly derived from only the position information, the same effect as when the position information is the MSF value is obtained. Can be obtained.

Further, in this embodiment, the disk analysis is completed within a period from the start of the file reproduction operation from the data position indicated by the position information to the end of the file reproduction operation for which the reproduction operation is started. Although the case is shown, the disk analysis does not have to be completed within the period until the reproduction operation of the file for which the reproduction operation is started is completed. Even when the disk analysis is not completed within the period until the reproduction operation of the file for which the reproduction operation has been started, the time required for the disk analysis can be shortened and the reproduction can be promptly performed at the time of resume.
(Second embodiment)
The second embodiment of the compressed data reproducing apparatus and compressed data reproducing method according to the present invention will be described below with reference to FIGS.

  First, an outline of the configuration of the compressed data reproducing apparatus according to the present embodiment will be described with reference to FIG. FIG. 5 is a schematic diagram showing the configuration of the compressed data reproducing apparatus according to the present embodiment. In the first embodiment, the same parts as those described with reference to FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and the description thereof is omitted.

  The reproduction unit 3 generates compressed data from the input RF signal, expands the compressed data, and reproduces a plurality of files in a predetermined order.

  When the reproduction operation of the reproduction unit 3 is stopped (at the time of transition to the standby state), the first position information detection unit 19 obtains the first position information indicating the data position where the reproduction operation of the reproduction unit 3 is stopped. To detect. In addition, the second position information detection unit 20 indicates a second data position indicating the leading data position of each of N (N is a natural number) files that are reproduced in a predetermined order after the file whose reproduction operation is stopped. Detect location information. The detection of the second position information by the second position information detection unit 20 is performed using the disk analysis data. The position information recording unit 5 holds the first and second position information detected by the first and second position information detection units 19 and 20.

  When the reproduction operation of the reproduction unit 3 is started, a different operation is performed depending on whether or not the position information recording unit 5 holds the first and second position information. When the reproducing unit 3 starts the reproducing operation in a state where the position information recording unit 5 does not hold the first and second position information, the reproducing unit 3 performs the reproducing operation after the disk analyzing unit 2 performs the disk analysis. To start. On the other hand, when the reproducing unit 3 starts the reproducing operation with the position information recording unit 5 holding the first and second position information (at the time of the resume operation), first, the first information held in the position information recording unit 5 is used. The reading unit 1 reads information recorded on the optical disk from the data position indicated by the position information 1, and the reproducing unit 3 starts the file reproduction operation from the data position indicated by the first position information. Then, after the reproduction operation of the file for which the reproduction operation has started is completed, the reproduction unit 3 selects N files (N is a natural number) reproduced in a predetermined order next to the file for which the reproduction operation has been started. Play in a predetermined order. Also, after the playback unit 3 starts the file playback operation from the data position indicated by the first position information held in the position information recording unit 5, the playback is performed in a predetermined order next to the file for which the playback operation has started. The disc analysis unit 2 performs disc analysis within a period until the reproduction unit 3 finishes the reproduction operation of N files (N is a natural number).

  A specific configuration example of the compressed data reproducing apparatus according to the present embodiment is obtained by changing the operation of the compressed data reproducing apparatus described with reference to FIG. 2 in the first embodiment. The operation procedure of the compressed data reproducing apparatus according to this embodiment will be described with reference to FIGS. 2, 6 and 7. FIG. 6 and 7 are flowcharts showing the operation procedure of the compressed data reproducing apparatus according to this embodiment. 6 shows an operation procedure when playback is stopped (at the time of transition to the standby state), and FIG. 7 shows a case where playback is resumed after the playback is stopped by the operation procedure shown in FIG. 6 (at the time of resume operation). The operation procedure is shown. In FIGS. 6 and 7, a case where the number N of files for detecting the second position information (N is a natural number) is one will be described as an example.

  First, the operation procedure when the compressed data reproducing apparatus according to the present embodiment shifts to the standby state is described with reference to FIG. Note that the operation of the compressed data reproducing apparatus according to the present embodiment at the time of transition to the standby state is obtained by replacing step S16 in FIG. 3 with step S36, and other steps are the same as in FIG. Therefore, the description of the steps common to the operation procedure when the compressed data reproducing apparatus according to the first embodiment is shifted to the standby state is omitted here.

  In step S35, if it is determined to shift to the standby state, the CD servo 7 detects the MSF value (first MSF value) of the data read from the CD 6 at the time of the determination. Further, the MCU 17 detects the MSF value (second MSF value) of the data located at the head of the next performance file after the performance file to be stopped using the disk analysis data obtained in step S32. The first and second MSF values are held in the RAM 18 via the MCU 17 (S36). Then, standby processing is performed after step S36 is completed (S37). By this standby processing, the reproduction of the performance file is interrupted at the data position indicated by the first MSF value held in the RAM 18.

  Next, the operation during the resume operation of the compressed data reproducing apparatus according to the present embodiment will be described with reference to FIG.

  In step S36, the first MSF value held in the RAM 18 is read from the RAM 18 (S41). Then, the optical pickup is moved to a position corresponding to the read first MSF value, and the performance file whose reproduction is interrupted at the transition to the standby state is reproduced from the data position indicated by the first MSF value (S42). . The disk analysis process (S43) is performed simultaneously with the start of the reproduction process in step S42 or after the start of the reproduction process in step S42.

  Next, the second MSF value is read from the RAM 18. Then, the optical pickup is moved to a position corresponding to the read second MSF value, and the reproduction of the next performance file is resumed (S44). If the disk analysis process (S43) does not end before the reproduction process in step S42 ends, the disk analysis process (S43) is performed within the execution period of the reproduction process in step S44.

  Next, normal reproduction processing is performed using the disk analysis data obtained in step S43 (S45). Specifically, using the disk analysis data, an MSF value corresponding to the start address of the performance file to be reproduced next is calculated, the optical pickup is moved to a position corresponding to the calculated MSF value, and the next performance is reproduced. Start playing the file.

  Next, it is determined whether or not to end the reproduction (S46). If it is determined not to end the reproduction, the process returns to step S45 to continue the reproduction. On the other hand, if it is determined that the reproduction is to be terminated, a reproduction termination process is performed (S47).

  If the playback position at the transition to the standby state is close to the end of the performance file, playback of the file that was interrupted at the transition to the standby state will end before the disc analysis ends, and the next analysis will continue until the disc analysis ends. The file may not be played back. However, the compressed data reproducing apparatus according to the present embodiment described above is not limited to not only the MSF value of the data currently being reproduced, but also the N files (N is a natural number) to be reproduced next when the standby state shifts. The MSF value corresponding to each head address is also held. For this reason, the compressed data reproducing apparatus according to the present embodiment waits for the end of the disk analysis even when the reproduction of the file whose reproduction has been interrupted at the transition to the standby state ends before the disk analysis ends. The next file can be reproduced without any problem.

  Also, the compressed data reproducing apparatus according to the present embodiment can obtain the same effects as those of the first embodiment in other effects.

  In the description of this embodiment with reference to FIGS. 6 and 7, the case where the number N of files for detecting the second position information (N is a natural number) is one is described as an example. However, it is not limited to this.

  In the present embodiment, MP3 is described as an example of the data compression standard. However, as in the first embodiment, the present invention is not limited to this.

  In the present embodiment, the RAM 18 is a non-volatile memory, but the RAM 18 may be a volatile memory as in the first embodiment.

  Furthermore, in this embodiment, the disk analysis is performed using the DSP 13, but the present invention is not limited to this as in the first embodiment.

  Further, in this embodiment, the MSF value indicating the data position at which reproduction is resumed at the time of resume is used as the MSF value of the data read from the CD 6 at the time of transition to the standby state. As in the first embodiment, this MSF value is Not limited to this.

  Furthermore, in this embodiment, the MSF value of the data read from the CD 6 at the time of transition to the standby state is held in the RAM 18. However, as in the first embodiment, the memory holding this MSF value is not limited to the RAM 18. .

Furthermore, in the present embodiment, the position information is an MSF value, but the position information is not limited to the MSF value as in the first embodiment.

  Further, in this embodiment, the file reproduction operation is started from the data position indicated by the position information, and then the N files are reproduced in a predetermined order after the file for which the reproduction operation is started. Although the case where the disk analysis ends within the period until the end of the file is shown, the disk analysis does not need to end within the period until the reproduction operation of the N files ends. Even when the disk analysis is not completed within the period until the reproduction operation of N files is completed, the time required for the disk analysis can be shortened, and the reproduction can be promptly performed at the time of resume.

  The present invention can be variously modified without departing from the scope of the invention in the implementation stage.

  As described above in detail, the characteristics of the compressed data reproducing apparatus according to the present invention are summarized as follows.

  The compressed data reproducing apparatus according to the present invention generates compressed data from an input RF signal, reproduces the file by decompressing the compressed data, and when the reproducing means stops the reproducing operation, Position information detecting means for detecting position information indicating a data position at which the operation is stopped, position information recording means for holding position information detected by the position information detecting means, and disk analyzing means for performing disk analysis. In the first state where the position information recording means does not hold the position information, the reproducing means starts a reproducing operation after the disk analyzing means performs the disk analysis, and the position information recording means In the second state in which the position information is held, the reproduction means starts the file reproduction operation from the data position indicated by the position information, and the second state In the period from the start of the file playback operation from the data position indicated by the position information to the end of the playback of the file for which the playback operation has been started, The disc analysis means performs disc analysis.

  The compressed data reproducing apparatus according to the present invention is characterized in that the position information is an MSF value.

Furthermore, the compressed data reproducing apparatus according to the present invention generates compressed data from an input RF signal, decompresses the compressed data, and reproduces a plurality of files in a predetermined order, and the reproducing means includes: When the reproduction operation is stopped, first position information detection means for detecting first position information indicating the data position at which the reproduction operation is stopped; and when the reproduction means stops the reproduction operation, the reproduction operation is Second position information detecting means for detecting second position information indicating the first data position of each of N files (N is a natural number) reproduced in the predetermined order next to the file to be stopped; The position information recording device comprises: position information recording means for holding the first and second position information detected by the first and second position information detection means; and disk analysis means for performing disk analysis. In the first state where the stage does not hold the first and second position information, the reproducing means starts the reproducing operation after the disk analyzing means performs the disk analysis, and the position information recording means In the second state in which the first position information and the second position information are held, the reproduction means starts the file reproduction operation from the data position indicated by the first position information, and this reproduction operation is started. After the file playback operation is finished, the playback means plays back the N files to be played back in the predetermined order after the file for which the playback operation has started, in the predetermined order, and the second In this state, after the reproduction means starts the file reproduction operation from the data position indicated by the first position information, the predetermined order is next to the file for which the reproduction operation is started. The reproducing operation of said N files Oite reproduced within a period of up to the playback unit is completed, the disk analysis means is characterized by performing disk analysis.

  Furthermore, the compressed data reproducing apparatus according to the present invention is characterized in that the first and second position information are MSF values.

  Furthermore, the compressed data reproducing apparatus according to the present invention is characterized in that the position information recording means has a nonvolatile RAM.

  Furthermore, the compressed data reproduction method according to the present invention includes a reproduction step for starting a file reproduction operation from the data position indicated by the position information, and the reproduction operation after starting the file reproduction operation from the data position in the reproduction step. And a disc analysis step for performing disc analysis within a period until the operation of starting the file for which the operation has been started is completed.

  Furthermore, in the compressed data reproduction method according to the present invention, the file reproduction operation is started from the data position indicated by the position information, and the reproduction operation is started after the file reproduction operation is started. A reproduction step of performing reproduction of N (N is a natural number) files reproduced in a predetermined order next to the file in the predetermined order, and a file reproduction operation from the data position indicated by the position information in the reproduction step A disk analysis step for performing disk analysis within a period from the start of playback to the end of the playback operation of the N files that are played back in the predetermined order after the file for which the playback operation has started; It is characterized by comprising.

  Furthermore, the compressed data reproduction method according to the present invention is characterized in that the position information is an MSF value.

1 is a schematic diagram showing the configuration of a compressed data reproduction apparatus according to a first embodiment of the present invention. 1 is a block diagram showing a configuration of a compressed data reproducing apparatus according to a first embodiment of the present invention. 3 is a flowchart showing an operation procedure when the compressed data reproducing apparatus according to the first embodiment of the present invention shifts to a standby state. 3 is a flowchart showing an operation procedure during a resume operation of the compressed data reproduction apparatus according to the first embodiment of the present invention. Schematic which shows the structure of the compressed data reproduction | regeneration apparatus based on 2nd Example of this invention. The flowchart which shows the operation | movement procedure at the time of the standby state transition of the compressed data reproducing | regenerating apparatus concerning 2nd Example of this invention. The flowchart which shows the operation | movement procedure at the time of the resume operation | movement of the compressed data reproduction apparatus which concerns on 2nd Example of this invention. The flowchart which shows the operation | movement procedure at the time of the standby state transition of the conventional compressed data reproducing | regenerating apparatus. The flowchart which shows the operation | movement procedure at the time of the resume operation | movement of the conventional compressed data reproducing | regenerating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Reading part 2 ... Disc analysis part 3 ... Playing part 4 ... Position information detection part 5 ... Position information recording part 6 ... CD
7 ... CD servo 8 ... spindle motor 9 ... slide motor 10 ... optical pickup 11 ... head amplifiers 12, 18 ... RAM
13 ... DSP
14 ... DAC
15 ... AMP
16 ... Speaker 17 ... MCU
19 ... 1st position information detection part 20 ... 2nd position information detection part

Claims (8)

Reproduction means for generating compressed data from the input RF signal, and decompressing the compressed data to reproduce a file;
Position information detecting means for detecting position information indicating a data position at which the reproducing operation is stopped when the reproducing means stops the reproducing operation;
Position information recording means for holding position information detected by the position information detecting means;
Disk analysis means for performing disk analysis,
In the first state where the position information recording means does not hold the position information, the reproducing means starts a reproducing operation after the disk analyzing means performs the disk analysis,
In the second state where the position information recording means holds the position information, the reproduction means starts a file reproduction operation from the data position indicated by the position information,
In the second state, the playback unit starts the file playback operation from the data position indicated by the position information until the playback unit ends the file playback operation from which the playback operation has started. A compressed data reproducing apparatus, wherein the disk analysis means performs disk analysis within a period. 2. The compressed data reproducing apparatus according to claim 1, wherein the position information is an MSF value. Reproduction means for generating compressed data from the input RF signal, decompressing the compressed data, and reproducing a plurality of files in a predetermined order;
First position information detecting means for detecting first position information indicating a data position at which the reproducing operation is stopped when the reproducing means stops the reproducing operation;
When the reproduction means stops the reproduction operation, a second data position indicating the head data position of each of N files (N is a natural number) reproduced in the predetermined order next to the file for which the reproduction operation is stopped. Second position information detecting means for detecting the position information of
Position information recording means for holding the first and second position information detected by the first and second position information detecting means;
Disk analysis means for performing disk analysis,
In the first state where the position information recording means does not hold the first and second position information, the reproducing means starts a reproducing operation after the disk analyzing means performs the disk analysis,
In the second state in which the position information recording means holds the first and second position information, the reproduction means starts a file reproduction operation from the data position indicated by the first position information, After the reproduction operation of the file for which the reproduction operation is started is completed, the reproduction means reproduces the N files to be reproduced in the predetermined order next to the file for which the reproduction operation is started. Play and
In the second state, after the reproduction means starts the reproduction operation of the file from the data position indicated by the first position information, the reproduction is performed in the predetermined order next to the file where the reproduction operation is started. The compressed data reproducing apparatus, wherein the disk analyzing means performs disk analysis within a period until the reproducing means finishes playing the N files. 4. The compressed data reproducing apparatus according to claim 3, wherein the first and second position information are MSF values. 5. The compressed data reproducing apparatus according to claim 1, wherein the position information recording unit includes a nonvolatile RAM. A playback step for starting a file playback operation from the data position indicated by the position information;
A disk analysis step for performing disk analysis within a period from the start of the file playback operation from the data position in the playback step to the end of the file playback operation for which the playback operation has started. A method for reproducing compressed data. The file reproduction operation is started from the data position indicated by the position information, and after the reproduction operation of the file for which the reproduction operation is started, the reproduction is performed in a predetermined order next to the file for which the reproduction operation is started. A reproduction step of performing reproduction operations of N (N is a natural number) files in the predetermined order;
The playback operation of the N files to be played back in the predetermined order after the file playback operation is started after the file playback operation is started from the data position indicated by the position information in the playback step. A compressed data reproduction method comprising: a disk analysis step for performing disk analysis within a period until the end. 8. The compressed data reproduction method according to claim 6, wherein the position information is an MSF value.

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