JPH06342579A - Recording medium and information processing device - Google Patents

Abstract

PURPOSE:To simply and real timewise reproduce data from a discoid recording medium without needing a large buffer capacity. CONSTITUTION:A segment allocation table including discriminating information showing whether each file is temporally continuous or not is recorded on a magneto-optical disk to be recorded and reproduced by a magneto-optical recording and reproducing device 8. Read and write in a main memory 4 are so controlled by an MPU 2 that when it is found from the discriminating information of the table that a file to be reproduced from the magneto-optical disk in the magneto-optical recording and reproducing device 8 is the temporally continuous file, write of data to be contained in the file to be reproduced can be performed in one part of the main memory 4, and at the same time, read of data to be contained in the file to be reproduced can be performed in the other part of the main memory 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records a file relating to audio data or moving image data to be processed in real time and a file relating to still image data, character data or program data which does not need to be processed in real time. The present invention relates to a recorded medium and an information processing apparatus that executes different processing modes according to the file attributes of this recording medium.

As is well known, a CD-ROM (Compa
ct Disc Read Only Memory)
Is a music CD (Compact Disc Digi
tal Audio: hereinafter abbreviated as CD-DA).

First, the physical format will be briefly described. The physical format means a format in which at least data can be physically read out when a CD-ROM disc is mounted in a CD-ROM drive.

One disc can contain up to 99 music tracks or data tracks.
For information on this track, see TOC (Table O
the beginning of the disc, called fContents),
That is, it is recorded on the innermost portion of the disc. The portion in which this TOC is recorded is the lead-in track (Lea
din Track). On the other hand, the last track, that is, the part where the last song ends in the CD-DA is called a lead-out track.

In CD-DA, 16 bits, 44.1k
Since a stereo audio signal is digitized and recorded at a sampling rate of Hz, 2 channels (stereo) x 2 bytes (16 bits) x 44,10 per second.
This means that data of 0 = 176,400 bytes is recorded. In a CD-ROM, a sector obtained by dividing one second into 75 equal parts is treated as the minimum unit, so one sector is 2,352 bytes.

As shown in FIG. 9, a CD-ROM MOD
In the case of E-1, SYNC data (12 bytes) and header (4 bytes) for synchronization and ECC (Error Collecti) for error correction are included in one sector.
on Coding: 276 bytes) and EDC (E
(Error Detect Coding: 4 bytes) and the like, the remaining 2048 bytes are recorded as user data.

For data such as voice and image data that does not require strict error correction due to data interpolation processing, the ECC and EDC are omitted, and 2,336 bytes excluding the SYNC and header are user data. Is recorded in one sector. This is a CD-ROM MOD
Called E-2.

As a higher standard of CD-ROM, CD-I
(Compact Disc Interact
e) and CD-ROM / XA (CD-ROM eXte
Neded Architecture) is defined. In these CD-I and CD-ROM / XA, C
The D-ROM MODE-2 is redefined and FORM-1 and FORM-2 are added as shown in FIG.
In the CD-I, the operating environment of the CD player, that is, the environment for operating the application in the CD player, is used as a CPU or an operating system (OS).
m) etc. are specified. The CD-ROM / XA is a standardized version of the physical format of CD-I or a format of audio data, which has been deleted by removing the provisions relating to the operating environment.

The above-mentioned CD-I and CD-RO
In the M / XA, when audio data to be played back in real time (real time) and data that does not need to be played back in other real time are recorded together, as shown in FIG. Are interleaved and recorded. That is, the audio (sound) data A is interleaved with the still image data V and other data D such as text data in sector units so that neither underflow nor overflow occurs during the reproduction process. The data is intermittently recorded on the disc in the state of being interleaved in sector units.

As described above, since the data to be reproduced in real time and the data not to be reproduced in real time are alternately recorded in each sector, the attribute of data is recorded in each sector. It is necessary to record the identification information shown.

Therefore, as shown in FIG. 9, a CD-ROM
In FORM-1 and FORM-2 of MODE-2, a submode (8 bits) area is defined in the subheader (8 bytes) of each sector, and 1 bit in this submode is used as a Real-Time Flag. , And the Real-Time Flag is “0”.
Depending on whether it is "1" or not, whether or not the data is data to be reproduced in real time is determined for each sector, and the processing mode is switched.

[0012]

As described above, the C specified by the conventional CD-I and CD-ROM / XA is used.
FORM-1 and FOR of D-ROM MODE-2
In M-2, Real-Time F indicating whether or not the data should be reproduced in real time for each sector.
Since the lag (identification information) has to be recorded, management is complicated. Furthermore, at the time of reproduction, it is determined whether or not the data should be reproduced in real time in each sector, and the processing mode is determined. You have to switch
There was a problem that processing became complicated.

In addition, in the conventional CD-ROM file system, when audio and images are reproduced in real time,
Since all the necessary file data is stored in the main memory before the data is reproduced, there is a problem that the capacity of the main memory is limited and the data cannot be reproduced for a long time.

An object of the present invention is to provide a recording medium in which data to be processed in real time and data which does not need to be processed in real time are mixed and recorded, in which the attribute management of data is simplified. The present invention further provides an information processing device capable of simplifying attribute determination processing of data read from the recording medium and reproducing data by real-time processing with a minimum storage capacity. To do.

[0015]

The recording medium of the present invention has a pre-allocated specific area (for example,
In the UTOC shown in FIG. 5, a file management table for managing files recorded in the data area (for example,
(Segment allocation table 800 shown in FIG. 5)
The file management table is provided with identification information for distinguishing between files to be processed continuously in time or files to be processed discontinuously in time (for example, in FIG. It is characterized in that an item for recording Real-Time) is provided.

Further, the information processing apparatus of the present invention records identification information for distinguishing between files to be processed continuously in time or files to be processed discontinuously in time. Of the recorded medium (for example, the magneto-optical disk 804 shown in FIG. 2), a reproducing means for reading the data recorded on the recording medium (for example, the magneto-optical recording / reproducing apparatus 8 shown in FIG. 1), and a recording medium. Buffer means having a storage capacity corresponding to a plurality of data storage units (for example,
Based on the main memory 4) shown in FIG. 1 and the identification information read from the recording medium by the reproducing means, when it is determined that the file read from the recording medium is a file to be processed continuously in time, Writing to the buffer means is performed so that data included in the file to be reproduced is written in a part of the buffer means while reading data included in the file to be reproduced in another part of the buffer means is performed. And control means for controlling the read operation and continuously outputting the data contained in the file to be reproduced to the outside (for example, M shown in FIG. 1).
And PU2).

[0017]

In the recording medium of the present invention, a file management table for managing files recorded in the data area is provided in a pre-allocated specific area in the recordable area, and the file management table is provided with a temporal In order to distinguish between files that should be processed continuously or files that should be processed discontinuously in time, there was an item to record identification information, so it was recorded in units of this file. The attribute of the data of the entire file can be determined simply by reading the identification information.

In the information processing apparatus of the present invention,
When it is determined that the file read from the recording medium is a file to be processed continuously in time based on the identification information read from the recording medium by the reproducing unit,
Writing to the buffer means is performed so that data included in the file to be reproduced is written in a part of the buffer means while reading data included in the file to be reproduced in another part of the buffer means is performed. Also, the read operation is controlled, and the data contained in the file to be reproduced is continuously output to the outside.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the information processing apparatus of the present invention. MPU (Micro Processing)
Unit) 2 is an RO that stores a system program.
Including M, performs data processing and input / output control. The main memory 4 is a semiconductor memory that stores programs and data transferred by the MPU 2. DMAC (Di
rect Memory Access Contro
The ller) 6 directly controls the data transfer between the input / output device and the main memory 4 without going through the MPU 2.

The magneto-optical recording / reproducing device 8 records the data supplied via the bus 100 and the interface 10 on the magneto-optical disk in the recording mode, and reproduces the data from the magneto-optical disk in the reproducing mode. 10 and the bus 100.

The audio interface 12 is A /
Including a D converter and a D / A converter, digitizes the input analog audio data and supplies it to the audio encoder / decoder 14, and converts the digital audio data input from the audio encoder / decoder 14 into an analog signal Output to the outside.

Audio encoder / decoder 14
Compresses the digital audio data supplied from the audion interface 10. As a compression technique, here, ATRAC (Adaptive TR) is used.
Transform Acoustic Coding) is used. The compressed data is transferred to the main memory 4 via the bus 100 under the control of the DMAC 6. On the contrary, the compressed audio data stored in the main memory 4 is transferred from the main memory 4 to the audio encoder / decoder 14 via the bus 100 under the control of the DMAC 6 and is expanded in the audio encoder / decoder 14. It is output to the outside via 12.

The image interface 16 includes an A / D converter and a D / A converter, converts analog image data such as a television signal or an image pickup signal output from a camera into digital image data and outputs the digital image data to the image display controller 18. To do. Also, image interface 1
Reference numeral 6 denotes an LCD which converts digital image data input from the image display controller 18 into analog image data.
(Liquid crystal display device) Supply to the controller 22. LCD
The controller 22 controls the LCD 24 to display the image represented by the input image data on the LCD 24.

The image display controller 18 displays the digital image data input via the image interface 16 on the LCD 24 via the image data interface 16 and the LCD controller 22 and supplies it to the image encoder / decoder 20. Also,
The image display controller 18 converts the digital image data input from the image encoder / decoder 20 into the image data interface 16 and the LCD controller 2.
2 is displayed on the LCD 24.

The image encoder / decoder 20 compresses the digital image data input from the image display controller 18. The compressed image data is transferred to the main memory 4 via the bus 100 under the control of the DMAC 6. On the contrary, the compressed image data stored in the main memory 4 is transferred to the image encoder / decoder 20 under the control of the DMAC 6, expanded therein, and supplied to the image display controller 18.

When the user operates the key 26,
Data or a command corresponding to the operation is transmitted via the bus 100 to the MPU 2 under the control of the operation panel controller 28.
Transferred to.

FIG. 2 is a diagram showing the configuration of a magneto-optical recording / reproducing apparatus 8 applied to the information processing apparatus shown in FIG. The magneto-optical recording / reproducing apparatus 8 is originally designed based on the Mini Disc (trademark) system developed for the purpose of portable, stationary, or vehicle-mounted personal audio equipment. This mini disc system uses a small and thin recording medium called a mini disc.

The mini disk is either a read-only optical disk having a diameter of 64 mm, a rewritable MO (magneto-optical) disk, or a hybrid disk (also called a partial ROM disk) provided with a rewritable area and a read-only area mixedly. The cartridge (W × L × H = 72 mm
(× 68 mm × 5 mm). Then, data is read from the mini-disc in which the read-only optical disc is housed, according to the same principle as that of a CD (Compact Disc).

On the other hand, data is recorded on the mini disk containing the MO disk or the hybrid disk by the magnetic field modulation direct overwrite method. The magnetic field modulation direct overwrite method is to irradiate a rotating disk with high-power laser light from below to raise the magneto-optical film of the portion to be recorded to the Curie temperature at which the coercive force of the magnetic material disappears, This is a method in which data is written in a portion from above the disk with a magnetic head.

In such a mini disk system, in the course of development as a personal audio device, each circuit element is integrated and each mechanical component is optimized, and the overall size and weight of the device is reduced. At the same time, low power consumption enables battery operation. Furthermore, in addition to the features that it has almost the same storage capacity (140 Mbytes) as the existing 3.5-inch MO disc, and the recording medium can be exchanged, due to the effect of mass production, the recording medium is better than other MO discs. The manufacturing cost of the drive device main body is also suppressed, as well as the manufacturing cost of the drive device itself. In addition, the reliability has been sufficiently proved from the actual usage record as a personal audio device.

The magneto-optical recording / reproducing apparatus 8 is shown in FIG.
More specifically, with reference to FIG. 5, a magneto-optical disk 804 that is rotationally driven by a spindle motor 802 is irradiated with a laser beam from an optical pickup 806 to generate a modulation magnetic field according to recording data in the magnetic head 80.
By applying the voltage by means of No. 8, data recording (so-called magnetic field modulation overwrite recording) is performed along the recording track of the magneto-optical disk 804, and the recording track of the magneto-optical disk 804 is traced by the laser beam by the optical pickup 806. , Magneto-optically reproduces data.

The optical pickup 806 is composed of, for example, a laser light source such as a laser diode, optical components such as a collimator lens, an objective lens, a polarization beam splitter, a cylindrical lens, and a photodetector divided into a predetermined arrangement. Magnetic disk 804
It is positioned by a feed motor 810 at a position facing the magnetic head 808 with the pinch in between.

When recording data on the magneto-optical disk 804, the optical pickup 806 drives the magnetic head 808 by the magnetic head drive circuit 809 and applies a modulation magnetic field according to the recording data to the target track of the magneto-optical disk 804. Then, data recording is performed by thermomagnetic recording by irradiating with laser light.

Further, the optical pickup 806 detects the focus error by, for example, the astigmatism method by detecting the laser light applied to the target track, and also detects the tracking error by, for example, the push-pull method, and at the same time, detects the magneto-optical property. When reproducing data from the disk 804, a difference in polarization angle (Kerr rotation angle) of the reflected light from the target track is detected to generate a reproduction signal.

The output of the optical pickup 806 is supplied to the RF circuit 812. The RF circuit 812 extracts the focus error signal and the tracking error signal from the output of the optical pickup 806, and the servo control circuit 814.
And the reproduced signal is binarized and supplied to the address decoder 816. Address decoder 816
Decodes the address from the supplied binarized reproduction signal and outputs it to the EFM / CIRC encoder / decoder 818, and also outputs the binarized reproduction data other than the binarized reproduction data related to the address to the EFM / CIRC. It is supplied to the encoder / decoder 818.

The servo control circuit 814 is composed of, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit and a sled servo control circuit.

The focus servo control circuit controls the optical pickup 806 so that the focus error signal becomes zero.
The focus control of the optical system is performed. The tracking servo control circuit controls the feed motor 810 of the optical pickup 806 so that the tracking error signal becomes zero.

Further, the spindle motor servo control circuit controls the spindle motor 802 so as to rotate the magneto-optical disk at a predetermined rotation speed (for example, a constant linear speed). Further, the sled servo control circuit is a magneto-optical disk 80 designated by the system controller 820.
The magnetic head 808 and the optical pickup 806 are moved to the target track position No. 4 by the feed motor 810.

EFM / CIRC encoder / decoder 8
Reference numeral 18 denotes an encoding process for error correction, that is, a CIRC (Cross Interleave) for data supplied via the bus 100 and the interface 10.
e Reed-Solomon Code) encoding processing and modulation processing suitable for recording, that is, EF
M (Eight to Fourteen Module)
ation) performs encoding processing.

EFM / CIRC encoder / decoder 8
The encoded data output from 18 is supplied to the magnetic head drive circuit 809 as recording data. The magnetic head drive circuit 809 drives the magnetic head 808 so as to apply a modulation magnetic field according to the recording data to the magneto-optical disk 804.

The system controller 820 uses the bus 10
0 and the write command is received via the interface 10, the recorded data is the magneto-optical disk 80.
Disc 804 so that it is recorded on four recording tracks.
Controls the upper recording position. This recording position control is performed by E
The recording position of the encoded data output from the FM / CIRC encoder / decoder 818 on the magneto-optical disk 804 is managed by the system controller 820, and the recording position of the recording track of the magneto-optical disk 804 is designated from the system controller 820. This is performed by supplying a control signal to the servo control circuit 814.

At the time of reproduction, the EFM / CIRC encoder / decoder 818 performs EFM demodulation processing on the inputted binarized reproduction data and CIRC decoding processing for error correction, and the interface 10 To the bus 100 via.

Further, when the system controller 820 receives a read command via the bus 100 and the interface 10, it controls the reproduction position with respect to the recording track of the magneto-optical disk 804 so that the reproduction data can be continuously obtained. . This control of the reproduction position is performed by changing the position of the reproduction data on the disc to the system controller 8
It is performed by supplying a control signal for controlling the reproducing position on the recording track of the magneto-optical disk 804 to the servo control circuit 814 under the control of 20.

Although various data such as image data and audio data are recorded on the magneto-optical disk 804, the recording track of the disk 804 has a minimum address called a sector as shown in FIG. It is divided into unit blocks. A sector number is assigned as address information to each sector. The sector size is set to 2352 bytes, for example.

Further, on the magneto-optical disk 804, data is recorded / reproduced in a cluster unit composed of 36 sectors. Therefore, all the data are accumulated in the main memory 4, collected in cluster size blocks, and transferred to the magneto-optical recording / reproducing device 8. Therefore, M
The PU 2 is a magneto-optical disk 80 of the magneto-optical recording / reproducing apparatus 8.
When managing No. 4, recording / playback is managed in cluster units for any data. For example, even 1-byte data is recorded and reproduced in the size of 1 cluster on the disk 804.

For example, as shown in FIG. 4, all the components shown in FIG. 1 are housed in one case 1000 to form a portable information processing device. The magneto-optical disk 804 is housed in the cartridge 804C and loaded in the recording / reproducing apparatus slot 1001 of the information processing apparatus.

As described above, since the input / output of the magneto-optical disk 804 is processed in cluster units, the segment allocation table for storing the usage status of the cluster group of the data area on the disk 804 is stored in the disk in this embodiment. It records in 804 and manages a file.

Segment allocation table 800
Is a magneto-optical disk 804, as shown in FIG.
UTOC following the lead-in area located on the innermost circumference
It is recorded in the (User Table Of Contents) area. The segment allocation table 800 is provided with an entry for each file, and each entry has a “file name” indicating the name of the file, an “attribute” indicating the attribute of the file, and a file “Date (Date)” indicating the recording date and time, and “Start cluster (Start C) indicating the beginning cluster in which the file is recorded”
“Lister)”, “cluster length (Length)” indicating the data size of the file, and “link pointer (Linkpointer)” indicating the entry of the next cluster when the file is not recorded in consecutive clusters.
Each is recorded.

In the segment allocation table 800, there are temporally continuous files, that is, files that require real-time processing, and temporally discontinuous files, that is, files that do not require real-time processing. The distinguishing Real Time Flag is recorded. That is, the segment allocation table 80
Specific 1 bit (2 in attribute information of 1 byte in 0
⁷ bits) is allocated as a Real Time Flag indicating whether or not it is a Real Time File. This Real Time Flag is "1"
Indicates that the corresponding file is a temporally continuous file, and that Real Time Flag is “0” indicates that the corresponding file is a temporally continuous file. .

When the file is temporally continuous, the data is continuously managed by a method such as interrupt processing so as not to be interrupted, and when the file is temporally discontinuous,
The access to the magneto-optical disk 804 is completed by reading and writing once. The MPU 2 discriminates continuous and large-sized data such as voice, and writes identification information indicating a temporally continuous file in the segment allocation table 800 to manage the data.
As will be described later, a temporally continuous file can be easily reproduced with a small buffer capacity, that is, even if the main memory 4 has a small capacity.

Access to the magneto-optical recording / reproducing apparatus 8 or the magneto-optical disk 804 in the embodiment shown in FIGS. 1 and 2 will be described below. First, the processing of image data will be described with reference to FIG. For example, the analog image signal output from the camera is converted into a digital image signal by the image interface 16 and supplied to the image display controller 18. The image display controller 18 returns the input digital image signal to the image interface 16 and converts the digital image signal into an analog image signal.
The image is displayed on 24.

When recording a still image on the magneto-optical recording / reproducing apparatus 8, the MPU 2 sends a control signal to the image display controller 18, and the image display controller 18 responds to this by inputting the input image signal to the image encoder / image encoder. After compression via the decoder 20, one still image is written in the main memory 4. Then, the image display controller 18 displays the image represented by the image signal written in the main memory 4 on the image encoder / decoder 20 and the image interface 16
And, it is displayed on the LCD 24 via the LCD controller 22.

Next, the MPU 2 sends a control signal to the magneto-optical recording / reproducing apparatus 8 via the bus 100 and the interface 10, and manages the write position on the magneto-optical disk 804 via the system controller 820 while controlling the main memory. The image data for one still image stored in No. 4 is written in the magneto-optical disk 804. And MPU2
Writes identification information indicating a temporally discontinuous file in the attribute area of the corresponding entry of the segment allocation table 800 of the magneto-optical disk 804. Data transfer from the main memory 4 to the magneto-optical recording / reproducing device 8 is performed by the DMAC 6. In addition, MPU
The control signal output from the image display controller 18 and the magneto-optical recording / reproducing apparatus 8 from the control unit 2 is a signal managed by the system program stored in the ROM in the MPU 2.

When recording a still image on the magneto-optical disk 804, since the data size (size) is known in advance, the number of clusters indicated by the integer part of [data size / cluster size + 1] is recorded. To MPU
2 performs control, and the control is completed by one processing.

When reproducing a still picture from the magneto-optical recording / reproducing apparatus 8, the MPU 2 selects from the attribute information of the entry corresponding to the still picture that needs to be reproduced in the segment allocation table 800 recorded on the magneto-optical disk 804. Information indicating that the file is temporally discontinuous is read, and accordingly, temporally discontinuous processing is performed.

That is, the MPU 2 is the magneto-optical disk 8
Segment allocation table 8 recorded in 04
00, the head cluster of the still image that needs to be reproduced is read, and the magneto-optical recording / reproducing apparatus 8 is instructed to read the image data of this head cluster, and the DMAC 6 is instructed to transfer the image data of this head cluster. To do. As a result, the DMAC 6 transfers the image data recorded in this head cluster to the main memory 4. Then, in response to the control signal from the MPU 2, the image display controller 18 expands the image data stored in the main memory 4 via the image encoder / decoder 20, and LC
It is displayed on the LCD 24 via the D controller 22.

Next, the MPU 2 refers to the length section of the segment allocation table 800, and when it judges that the length of the image data is more than one cluster, it reads out the image data of the next cluster by the magneto-optical method. The recording / reproducing apparatus 8 is instructed and the DMAC 6 is instructed to transfer the image data of the next cluster. This allows DMA
C6 transfers the image data recorded in the next cluster to the main memory 4. Then, in response to the control signal from the MPU 2, the image display controller 18 expands the image data stored in the main memory 4 via the image encoder / decoder 20, and displays it on the LCD 24 via the LCD controller 22.

Disk 80 of such still image data
The transfer from 4 to the main memory 4 and the display on the LCD 24 are performed by the number of clusters of the still image.

Recording and reproduction of character data and program data are performed in the same manner as still image data.

Next, processing of audio data, which is an example of a temporally continuous file, will be described. First, the case of recording audio data on the magneto-optical recording / reproducing apparatus 8, that is, the magneto-optical disk 804 will be described with reference to FIG. The input audio data is converted into a digital signal by the audio interface 12,
It is compressed by the audio encoder / decoder 14 and temporarily stored in the main memory 4.

Data amount of one cluster size (about 64 KB
yte) is stored in the main memory 4, the MPU2
Sends a control signal to the magneto-optical recording / reproducing apparatus 8 via the bus 100 and the interface 10 and manages the write position to the magneto-optical disk 804 via the system controller 820, while storing 1 in the main memory 4.
Audio data for clusters is recorded on the magneto-optical disk 804.
Write in. Then, the MPU 2 uses the magneto-optical disk 80.
The identification information indicating that the files are temporally continuous is written in the attribute area of the corresponding entry of the segment allocation table 800 of No. 4. Data transfer from the main memory 4 to the magneto-optical recording / reproducing device 8 is performed by the DMAC 6.

Since the audio data cannot grasp the data size in advance and is continuous data in time,
That is, the MPU 2, that is, the system program prepares a buffer memory area of two or more clusters in the main memory 4, and records on the magneto-optical disk 804 while switching one cluster at a time. That is, when the MPU 2 is writing to the buffer memory for one cluster in the main memory 4, another MPU 1 in the main memory 4 is written.
The audio data is written to the magneto-optical disk 804 so that the audio data is not interrupted by reading from the buffer memory for the cluster.

When reproducing audio data from the magneto-optical recording / reproducing apparatus 8, the MPU 2 gives priority to management of recording data position information, DMAC control, and buffer memory control over other jobs so that sound is not interrupted. Need to be done. In order to realize this, every time the DMAC 6 completes the transfer of one cluster of audio data from the magneto-optical recording / reproducing device 8 to the main memory 4, the MPU 2
Interrupt.

The reproduction of the audio data will be described in more detail. When reproducing the audio data from the magneto-optical recording / reproducing device 8, the MPU 2 needs to reproduce the segment allocation table 800 recorded in the magneto-optical disk 804. The information indicating that the file is temporally continuous is read from the attribute information of the entry corresponding to the audio data to be reproduced, and the temporally continuous processing is performed according to the information.

That is, the MPU 2 is the magneto-optical disk 8
Segment allocation table 8 recorded in 04
00, the head cluster of the audio data that needs to be reproduced is read, the magneto-optical recording / reproducing apparatus 8 is instructed to read the audio data of this head cluster, and the DMAC 6 is instructed to transfer the audio data of this head cluster. To do. This allows the DMAC6
Transfers the audio data recorded in the first cluster to the main memory 4.

When the DMAC 6 completes the data transfer for one cluster from the magneto-optical recording / reproducing device 8 to the main memory 4, it outputs an interrupt signal to the MPU 2. In response to this, the MPU 2 sends the segment allocation table 8
00, when the audio data spans two or more clusters, the magneto-optical recording / reproducing apparatus 8 is instructed to read the audio data recorded in the next cluster of the magneto-optical disk 804, and A DMAC control signal for transferring audio data
Output to 6. In response to this, the DMAC 6 transfers the audio data recorded in the next cluster of the magneto-optical disk 804 to the main memory 4.

A disc 8 of such audio data
Transfer from 04 to the main memory 4 is performed for the number of clusters of audio data.

As described above, at the time of recording / reproducing audio data, while writing to the buffer memory for one cluster in the main memory 4, the buffer memory for another cluster in the main memory 4 is written. Since the buffer capacity required for reading and writing is 2 clusters, the buffer capacity required for recording and reproducing can be reduced.

Further, as described above, during recording and reproduction of audio data, the MPU 2 maintains the real-time property of the sound by interruption, so that the MPU 2 intermittently accesses the audio file on the magneto-optical disk 804. Therefore, the MPU 2 can perform other processing during the time other than the time of accessing the audio file, and thus the MPU 2 can be used efficiently.

As described above, the magneto-optical disk 80
The audio data recorded in 4 is compressed,
The data is temporarily stored in the main memory 4 in a compressed state and expanded by the audio encoder / decoder 14. When such expansion is performed, the MPU 2
However, if the still image data recorded on the magneto-optical disk 804 is stored in an area different from the area where the compressed audio data of the main memory 4 is recorded, both the still image and the sound are reproduced. be able to.

In the above embodiment, all the constituent elements shown in FIG. 1 are contained in one case. For example, as shown in FIG. 8, the LCD among the constituent elements shown in FIG. The components excluding the controller 22 and the LCD 24 are housed in a case 1000S, for example, a single CR
It may be connected to T24C.

As an example of the temporally continuous file, in addition to the above-mentioned audio data file, a moving image data file can be cited.

[0073]

According to the recording medium of the present invention, a file management table for managing files recorded in the data area is provided in a pre-allocated specific area in the recordable area, and this file management table is used. , There is an item to record identification information to distinguish between files that should be processed continuously in time or files that should be processed discontinuously in time. Identification information indicating whether or not the data is to be processed can be managed in file units, and the conventional CD-I and CD-
The attribute management of data can be simplified as compared with the case where the management is performed in sector units like ROM / XA. Further, by simply reading the identification information recorded in file units from the recording medium, the attributes of the data of the entire file can be collectively determined, and the subsequent processing mode can also be determined. Attribute determination processing and subsequent processing can be simplified.

Further, according to the information processing apparatus of the present invention,
When it is determined that the file read from the recording medium is a file to be processed continuously in time based on the identification information read from the recording medium by the reproducing unit,
Writing to the buffer means is performed so that data included in the file to be reproduced is written in a part of the buffer means while reading data included in the file to be reproduced in another part of the buffer means is performed. And the read operation is controlled, and the data contained in the file to be reproduced is continuously output to the outside.
Just by providing the buffer means with the minimum required storage capacity,
Data can be reproduced by real-time processing.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an information processing apparatus of the present invention.

FIG. 2 is a block diagram showing a configuration example of the magneto-optical recording / reproducing apparatus of FIG.

FIG. 3 is a format diagram showing a cluster structure which is a recording unit of the magneto-optical recording / reproducing apparatus of FIG.

FIG. 4 is a perspective view showing an example of an external configuration of the embodiment of FIG.

5 is a diagram showing an example of a segment allocation table 800 used in the embodiment of FIG.

FIG. 6 is an explanatory diagram showing an example of a still image recording operation in the embodiment of FIG.

FIG. 7 is an explanatory diagram showing an example of an audio data recording operation in the embodiment of FIG.

FIG. 8 is a perspective view showing an example of the external configuration of another embodiment of the information processing apparatus of the present invention.

FIG. 9 is a diagram for explaining a sector structure of a conventional CD-ROM.

FIG. 10 is a diagram for explaining a state of interleaved recording in sector units in conventional CD-I and CD-ROM / XA.

[Explanation of symbols]

 2 MPU 4 main memory 8 magneto-optical recording / reproducing device 14 audio encoder / decoder 800 segment allocation table 804 magneto-optical disk

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G11B 20/12 9295-5D

Claims (10)

[Claims] 1. A file management table for managing files recorded in a data area is provided in a pre-allocated specific area in the recordable area, and the file management table is processed continuously in time. A recording medium provided with an item in which identification information is recorded for distinguishing between a file to be processed and a file to be processed discontinuously in time. 2. The recording medium according to claim 1, wherein the item of identification information of the file management table has the identification information recorded for each file. 3. The recording medium is a disc, and the specific area is a UTOC area (User Table Of C) adjacent to a lead-in area (Lead In Area) provided in the innermost circumference of the disc.
2. The recording medium according to claim 1, wherein the recording medium is assigned to a specific sector in the contents area. 4. The recording medium is composed of a magneto-optical recording medium, and includes data included in a file to be processed continuously in time and data included in a file to be processed discontinuously in time. The recording medium according to claim 1, wherein the data is recorded in the data area by a magnetic field modulation direct overwrite method. 5. The file to be processed continuously in time is a file relating to audio data or moving image data to be processed in real time, and the file to be processed discontinuously in time is real time processing. The recording medium according to claim 1, wherein the recording medium is a file relating to still image data, character data, or program data that need not be executed. 6. A recording medium having identification information recorded therein for distinguishing between a file to be processed continuously in terms of time and a file to be processed discontinuously in terms of time, said recording medium Playback means for reading the data recorded on the medium, buffer means having a storage capacity corresponding to a plurality of data storage units of the recording medium, and the identification information read from the recording medium by the playback means Based on the above, when it is determined that the file read from the recording medium is a file to be continuously processed in time, data included in the file to be reproduced is written in a part of the buffer means. In parallel, the buffer means is read so as to read the data contained in the file to be reproduced in the other part of the buffer means. An information processing apparatus, comprising: a control unit that controls the writing and reading operations to be performed and continuously outputs the data included in the file to be reproduced to the outside. 7. The recording medium is recorded as compressed data in a state in which data included in a file to be processed continuously in time is compressed and read from the recording medium by the reproducing unit. And further comprising decompression means for decompressing the compressed data written in the buffer means, wherein the control means records the recording data during a processing period in which the decompression means decompresses the compressed data written in the buffer means. 7. The data contained in the file to be processed discontinuously in time recorded on the medium is written in an area different from the area in which the compressed data is written in the buffer means. The information processing device described. 8. The recording medium is provided with a file management table for managing files recorded in a data area in a pre-allocated specific area in the recordable area, and one item of the file management table. In the identification information for distinguishing between a file to be processed continuously in time or a file to be processed discontinuously in time is recorded. It is determined whether the file read from the recording medium is a file to be processed continuously in time based on the identification information read from the file management table of the recording medium by the means. The information processing device according to claim 6 or 7. 9. The recording medium is a disc, and the specific area is a UTOC area (User Table Of C) adjacent to a lead-in area (Lead In Area) provided in the innermost circumference of the disc.
assigned to a specific sector of the recording medium, and the control unit reads from the recording medium based on the identification information read from the file management table of the recording medium at the start of reading by the reproducing unit. The information processing apparatus according to claim 8, wherein it is determined whether or not the read file is a file to be processed continuously in terms of time. 10. The recording medium is composed of a magneto-optical recording medium, and includes data included in a file to be processed continuously in time and data included in a file to be processed discontinuously in time. 9. The information processing apparatus according to claim 8, wherein the data is recorded in the data area by a magnetic field modulation direct overwrite method, and the reproducing unit optically reads data from the magneto-optical recording medium.