JP2001236741A - Disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To divide a series of recording data, to record them into plural data areas and to reproduce a series of recorded data from these data areas. SOLUTION: This disk is provided with the data area A21 where a series of a recording data unit is divided to be recordable dispersedly and a read-in area A22 recording control information consisting of track number information for corresponding to the recording data unit, address information for showing the recording positions of the divided and dispersedly recorded recording data unit and link information from one recording data of the divided and dispersedly recorded recording data unit to another recording data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk for dividing a series of recording data and recording the divided data in a plurality of data areas.

[0002]

2. Description of the Related Art An optical disk can have a recording capacity about two to three digits larger than a magnetic disk, and can be accessed at a higher speed than a tape-shaped recording medium. In addition, since it has an advantage that data can be recorded / reproduced in a non-contact manner with respect to a medium and durability is excellent, it has been widely used in recent years. As this optical disk, a so-called CD (compact disk) is most widely known.

In the above-mentioned CD, a 24-bit synchronization signal provided as EFM (Eight to Fourteen Modulation) data obtained by converting a signal of 8 bits per symbol into data of 14 bits (1 channel bit), 14 bits (1 symbol) Subcode and 14 × 32 bits (32
A data format in which 588 bits consisting of data and parity of performance information of each symbol and 3 margin bits provided between each symbol are defined as one frame and a 98-bit frame as a subcode block is standardized. I have. Then, the absolute address of the one subcode block is given by the Q channel subcode signal of the subcode, and data processing is performed on data such as performance information in units of the one subcode block. The CD is provided with a lead-in area on the inner side of a data area in which performance information and the like are recorded. In this lead-in area, time code indicating the start position of the song in order as Table of Contents (TOC) data indicating the recording position of the data area,
The first and last song numbers of the disc, the last song number, and the time code indicating the end position of the last song are sub-coded and recorded as the Q channel sub-code signal. I have.

[0004] In the CD-I (CD-interactive) format, each level as shown in Table 1 below is defined as a mode for recording / reproducing a bit-compressed digital audio signal.

[0005]

[Table 1]

In Table 1, for example, when a disk recorded in the level B mode is reproduced, a signal obtained by bit-compressing a digital signal of a standard CD-DA format by about four times is reproduced. Therefore, for example, when all of the recorded data is stereo audio compressed data, the reproduction can be performed for about four times as long (or for four channels), and even for an optical disk having a diameter of about 8 cm or less, about 70 minutes can be obtained. Recording and reproduction become possible.

[0007] By the way, using a portable optical disk,
In particular, in the case where a headphone stereo device having a so-called pocket size or a recording and / or reproducing device similar thereto is to be provided, for example, the above-mentioned existing CDs having a disk diameter of 12 cm and 8 cm ( Although a so-called CD single is standardized in the format, a disk with a diameter of 12 cm is used because the external dimensions of the recording / reproducing apparatus are too large and the portability is poor. It is possible. However, when a portable or pocket-sized recording and / or reproducing apparatus is to be constructed using an optical disk having a small diameter of about 8 cm or less, the following problem arises.

First, the sampling frequency is 44.1 kHz.
Stereo digital PC quantized by 16 bits in z
In a standard CD format (CD-DA format) in which an optical disk on which an M audio signal is recorded is supplied from a manufacturer side and only reproduction is performed on the user side, the reproduction time (recording time) of a disk having a diameter of 8 cm is recorded. ) Is as short as about 20 to 22 minutes at the maximum, which means that a single symphony of classical music cannot be recorded. Reproduction time is up to 7 which is about the same as the current 12cm CD.
A little over 4 minutes is desired. In the CD-DA format, recording cannot be performed on the user side. Furthermore, the non-contact optical pickup device is vulnerable to mechanical vibrations and the like, and is likely to cause a track shift or a focus shift due to the vibrations or the like. Some strong countermeasures are needed to reduce the negative impact on the environment.

Next, the standard CD format (C
D-DA format)
In the D-MO format (format using a recordable magneto-optical disc), the recording / reproducing time of a disc having a diameter of 8 cm is the same as that of the CD-DA format.
It takes about 0 to 22 minutes, and has the disadvantage of being short. In addition, a track shift or a focus shift of the optical pickup device due to mechanical vibration or the like is likely to occur.
Measures are needed to prevent adverse effects on the reproduction operation.

By the way, in the CD-I format, since the disk is driven to rotate at the same linear velocity as the standard CD-DA format, continuous audio compression data is stored in one unit per n units of recording unit on the disk. It will be played back at the unit rate. This unit is called a block or a sector. One block (sector) is 98 frames and has a cycle of 1/75 second. n is a numerical value corresponding to the reproduction time or the bit compression ratio of the data. For example, in the level B stereo mode, n = 4. Therefore, in the level B stereo mode, one sector per four sectors, such as SDDDDSDDD (where S is an audio sector and D is another data sector), in sector units. Is recorded as an audio sector on the disk. However, at the time of actual recording, the above data string
Since predetermined encoding processing (error correction encoding processing and interleaving processing) similar to that for normal CD format audio data is performed, the data of the audio sector S and the data of the data sector D are recorded in the recording sectors on the disk. Are distributed and arranged.
Here, for example, video data or computer data is used as the other data sector D. When a bit compressed audio signal is also used as the data sector D, audio sectors S1 to S4 for four channels are used. S4 is a data string [S1,
S2, S3, S4, S1, S2, S3, S4...] Are encoded and recorded on the disc.

When recording and reproducing a continuous audio signal, the four-channel audio signals are used by connecting them from the first channel to the fourth channel. At this time, after the data of the first channel corresponding to the audio sector S1 is reproduced from the innermost circumference of the disk to the outermost circumference, the process returns to the innermost circumference of the disk again, and the data of the second channel corresponding to the audio sector S2 is transferred. The data is reproduced to the outermost circumference, then the third channel data corresponding to the next audio sector S3 from the innermost circumference of the disk is again reproduced to the outermost circumference, and finally the remaining audio sectors S4 from the innermost circumference of the disk are again reproduced. By reproducing the data of the fourth channel up to the outermost circumference, the reproduction is performed for a continuous quadruple time.

However, in the case of continuous reproduction as described above, a long-distance track jump operation for returning from the outermost circumference to the innermost circumference is required several times, and this track jump operation cannot be performed instantaneously. There is a big problem that the reproduced data is lost and the reproduced sound is interrupted. When recording a continuous audio signal, for example, due to the interleave processing at the time of recording, for example, the sector S
2 alone cannot be recorded, and the interleaving including the data of the adjacent sectors S1 and S3 or the surrounding sectors is necessary, and the signal of the already recorded sector is rewritten. Is required. Therefore, it is very difficult to record such continuous compressed audio data.

[0013]

The conventional CD
In the -MO format, as in the above-described standard CD-DA format, it is defined that a start address and an end address are recorded as TOC information. Conventionally, in the CD-MO system, since the memory control is not premised, the information is lost when accessing the discontinuous area. Was limited. As described above, in the conventional CD-MO format, a series of recording data cannot be divided and recorded in a plurality of areas. For example, when a certain track recorded once is erased and then recorded again, When performing the editing operation, there is a problem that recording can be performed only in one continuous empty area. For example, as shown in FIG. 13, assuming a magneto-optical disk having a recording area secured for 60 minutes of the recording time, the first performance information in the data area D ₁ of the 0 to 15 minutes is recorded , in the data area D ₃ up to 30 to 45 minutes and the second performance information is recorded, in the data area D ₄ up to 60 minutes minutes data area D ₂ and 45 to 15 minutes to 30 minutes have been recorded data If no, the lead-in area, as shown in FIG. 14, as information indicating that it is recorded in the data area D ₁ of the 15 minutes minutes the first performance information is 0, the first performance information , Recording start information "0" and recording start position information "00:00:00", track number information "1" indicating first performance information, and recording end information "0". as well as Recording start position information "15 minutes 04 seconds 00 frames" is recorded, also, as the information indicating that the second performance information is recorded in the data area D ₃ up to 30 to 45 minutes, the second performance Track number information "2" indicating recording information, recording start information "0" and recording start position information "30:00:06 frame", track number information "2" indicating first performance information, and recording end information "0". "And recording start position information" 45: 00.00 frame ". And
If the record new third performance data to the magneto-optical disk is vacant data areas D ₂ and the data area D ₄
Can not be recorded over, it can not be recorded only in the range of the recording capacity of the data area D ₂ or the data area D _4.

The present invention has been made in view of such circumstances, and a series of recording data is divided and recorded in a plurality of data areas, and the series of recording data is reproduced from these data areas. Is provided.

[0015]

According to the present invention, there is provided a disk in which a continuous recording data unit is divided into discretely recordable data areas, track number information corresponding to the recording data units, and the divided recording data units. Information that indicates a recording position of a recording data unit that is discretely recorded in the recording data unit and information that is combined from one recording data of the recording data unit that is divided and discretely recorded to another recording data. And a management area in which information is recorded.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block circuit diagram showing a schematic configuration of an optical disk recording / reproducing apparatus for recording / reproducing a disk according to the present invention.

The optical disk recording / reproducing apparatus shown in FIG. 1 includes a magneto-optical disk having a recording / reproducing area in which data can be recorded / reproduced, a reproduction-only optical disk having a recording data reproducing-only area, and a data recording / reproducing apparatus. A magneto-optical disk having a recordable / reproducible area and a read-only area for recording data is used as a recording medium, and these disks are driven to rotate by a spindle motor 1. Here, the magneto-optical disc 2 is rotated by the spindle motor 1 and a recording and reproduction area A ₂₀ provided for example on the outside of the read-only area A ₁₀ Toko playback only area A _10, as shown in FIG. 2 It has become.

A read-only area A of the magneto-optical disk 2
Reference numeral ₁₀ denotes a data area A ₁₁ in which data such as performance information is recorded, and a lead-in area A provided on the inner peripheral side thereof.
₁₂ are provided. The read-only area A _10, "1" digital data is recorded as the presence or absence of pits corresponding to "0".

[0020] the lead-in area _{A 12} is inventory indicating the recording position or recording contents of the data area _{A 11} (TOC: T
The record start address information and the record end address information are sequentially recorded for all performance information as data.

The recording / reproducing area A of the optical disc 1
_Reference numeral ₂₀ denotes a data area A ₂₁ in which data such as performance information is recorded, and a lead-in area A provided on the inner peripheral side thereof.
₂₂ . The recording and reproduction area A ₂₀ is a magneto-optical recording medium area. The lead-in area A ₂₂ includes track number information indicating a series of recording data recorded in each data area as TOC data indicating the recording position and recording content of the recording data recorded in the data area A _21. And address information indicating the position of each data area and connection address information indicating the connection destination from one data area to another data area.

In this embodiment, as shown in the data table of FIG. 3, the TOC data includes the lead-in area A as main data following 16-byte header data.
₂₂ . In the data table of FIG. 3, the vertical address "0-3" in 4-byte units is the header data, the 12 bytes of the vertical address "0-2" are the synchronization signal, and the vertical address "3" is the fourth byte. One byte and the second byte are assigned to the cluster address.
The fourth byte of the vertical address “11” is assigned to a pointer P-FAT indicating a free area in the data table.

The area of the vertical address "12 to 16" forms a track number table, and the first byte of the vertical address "12" is a pointer P- pointer of the start address of the area where the recording data can be recorded. The second byte of the vertical address “12” to the fourth byte of the vertical address “75” are allocated to the pointer P-TNOn of the start address of the track number n. The value of the pointer P-TNOn indicates the offset position that gives the start address of the track number TNO-n given by start address = 76 × 4 + (P-TNOn) × 8.

Then, the vertical address "76-85"
Forms an address table of the data area, and is assigned to the start address and end address of the data area specified by the pointers P-FRA and P-TNOn. The first to third bytes of the even address after the vertical address “76” are allocated to the start address of the data area, and the vertical address “76” is allocated.
The first to third bytes of the subsequent odd addresses are assigned to the end address of the data area. Further, the fourth byte of the even-numbered address after the vertical address "76" is allocated to various track mode information such as a copyright protection mode and a rewrite inhibition mode. The fourth byte of the odd address after the vertical address "76" is assigned to the pointer Link-P indicating the connection destination from one data area to another data area.

Here, for example, as shown in FIG.

[000] recorded in the data area _{D 1} of the from _H cluster to [1C4] _H cluster, [1C4]
Data area _{D 2} from _H cluster to [384] _H cluster has a free space, also recorded in the data area _{D 3} of the second performance information from the [384] _H cluster to [546] _H cluster , [546] _H cluster to [708] _H cluster data area D ₄
There Assuming that a free space in the lead-in area A ₂₂ is, TOC information shown in TOC data table of FIG. 5 is recorded. That is, in the TOC data table, since the vertical address “84” and subsequent areas are vacant areas, the vertical address “8” is used as the fourth byte of P-FAT data of the vertical address “11”.
[04] _H indicating "4" is recorded. Also, the pointer P-FRA of the first byte of the vertical address “12”
As the data, the vertical address “76” is indicated [0
0] _H is recorded. Also, the vertical address “12”
[01] _H indicating the vertical address "78" is recorded as the second byte pointer P-TNO1 data. [03] _H indicating the vertical address "82" is recorded as the third byte pointer P-TNO2 data of the vertical address "12".

Then, the pointer P-FRA data of the first byte of the vertical address "12"

[00] start address information of the data area D ₂ as the first to third bytes of the specified longitudinal address "76" by the _H (i.e. [01C4] _H cluster,

[00] _H sector) is recorded. Also, the next vertical address “77”
The first to the end of the data area _{D 2} address information as the third byte (i.e. [0383] _H cluster,
[1F] _H sector) is recorded. Further, the pointer Link- of the fourth byte of the vertical address “77” is set.
[02] _H indicating the vertical address "80" is recorded as P data. The pointer Link-P
The data area D as the first to third bytes of the vertical address “80” specified by the data [02] _H
4 starting address information (ie, [0546] _H cluster,

[00] _H sector) is recorded. Further, the end address information of the data area D ₄ as the first to third bytes of the next vertical address "81" (ie [0
708] _H cluster, [1F] _H sector) are recorded. Furthermore, as a pointer Link-P data of the fourth byte of the vertical direction address "77" indicates that there is no free area following the data area D ₄

[00] _H is recorded.

The second address of the vertical address "12"
As the first to third bytes of the specified longitudinal address "78" by the byte pointer P-TNO1 data [01] _H, the first performance information recorded start address information of the data area D ₁ (i.e.

[0000] _H
cluster,

[00]_H Sector) is recorded. Also,
The first to third bytes of the next vertical address “79”
And the data area D ₁ End address information (Sunawa
Chi [01C4]_H Cluster, [1F]_H Sector)
Is recorded. Further, the fourth address of the vertical address “79”
This data is used as byte pointer Link-P data.
Area D₁ Indicates that there is no data area following [0
0]_H Is recorded.

The third address of the vertical address "12"
As the first to third bytes of the specified longitudinal address "82" by the byte pointer P-TNO2 data [03] _H, the start address information of the second data area D ₃ where the performance information is recorded (i.e. [0384] _H
cluster,

[00]_H Sector) is recorded. Also,
The first to third bytes of the next vertical address "83"
And the data area D ₃ End address information (Sunawa
Chi [0545]_H Cluster, [1F]_H Sector)
Is recorded. Further, the fourth address of the vertical address "83"
This data is used as byte pointer Link-P data.
Area D₃ Indicates that there is no data area following [0
0]_H Is recorded.

[0029] Thus, recording and reproduction area A ₂₀ of the optical disc 1 in this embodiment includes a data area A ₂₁ in which data such as performance information is recorded, a lead-in area A ₂₂ provided on the inner peripheral side has bets, as TOC data indicating the recording position or recording contents of data recorded in the data area a _21, the track number information indicating a sequence of recording data recorded in each data area, the data and address information indicating the position of the region, the binding address information indicating the merged from 1 data area to another data area is recorded in the lead-in area a _22, a plurality of dividing the series of recording data It can be recorded in the data area.

[0030] For example, as shown in FIG. 6, the third playing information can be recorded over to the data area D ₂ and the data area D _4. In this case, when the recording of the course of the [546] the third performance data at _H cluster of the data area D ₄ is completed, it is rewritten TOC data table as shown in FIG.

That is, as a pointer of address information indicating the position of the data area where the third performance information is recorded, a pointer PT indicating the vertical address "80" is used.
NO3 data [02] _H is the vertical address "1"
2 "in the fourth byte. Also, by the third performance information is recorded across the data region D ₂ and the data area D _4, free space capable of recording the record data, from [5DD] _H cluster to [708] _H cluster since the data area _{D 5,} the pointer P-FRA data of the first byte of the longitudinal address "12"

[00]_H Vertical address "76" specified by
Of the data area D as the first to third bytes of ₅ Opening of
Start address information (that is, [05DD]_H cluster,

[00] _H sector) is recorded. Further, the end address information of the data area D ₅ as the first through third bytes of the next vertical address "77" (i.e. [070
8] _H cluster, [1F] _H sector) are recorded.
Further, the data area D _{5 is} used as the pointer Link-P data of the fourth byte of the vertical address “77”.
Indicates that there is no free space following

[00] _H is recorded.

Then, the first to third addresses of the vertical address "80" designated by the fourth byte pointer P-TNO3 data [02] _H of the vertical address "12".
Start address information of the data area _{D 2} as a byte (i.e. [01C4 _H cluster,

[00] _H sector) is recorded. Also, the next vertical address “81”
The first to the end of the data area _{D 2} address information as the third byte (i.e. [0383] _H cluster,
[1F] _H sector) is recorded. Further, a pointer Link- of the fourth byte of the vertical address “81” is set.
[04] _H indicating the vertical address "84" is recorded as P data. The pointer Link-P
Data [04] The data area D as the first to third bytes of the vertical address “84” specified by _H
4 starting address information (ie, [0546] _H cluster,

[00] _H sector) is recorded. Further, the end address information of the data area D ₄ as the first to third bytes of the next vertical address "85" (ie [0
5DC] _H cluster, [1F] _H sector) are recorded. Furthermore, as a pointer Link-P data of the fourth byte of the vertical direction address "85" indicates that there is no subsequent data area in the data area D ₄

[00] _H is recorded.

The optical disk recording / reproducing apparatus of this embodiment applies a modulation magnetic field corresponding to recording data to the magneto-optical disk 1 rotated by the spindle motor 1 while, for example, irradiating the optical head 3 with laser light. Data is applied along the recording track of the recording / reproducing area A ₂₀ of the magneto-optical disk 2 (so-called magnetic field modulation recording) by being applied by the magnetic head 4. Data is reproduced optically by tracing the recording tracks of the recording area ₁₀ and the recording / reproducing area A _{20 with} the laser light by the optical head 3.

The optical head 3 includes a laser light source 31 such as a laser diode, a collimator lens 32, a beam splitter 33, and an objective lens 3, as shown in FIG.
4. Optical components such as the polarization beam splitter 35, the first and second photodetectors 36 and 37 for detecting the light separated by the polarization beam splitter 35, and the addition and synthesis of the respective detection outputs from the photodetectors 36 and 37. It comprises a single signal combiner 38 and a first signal combiner 39 for subtracting and combining respective detection outputs. The first signal combiner 39 is provided at a position facing the magnetic head 4 with the magneto-optical disk 1 interposed therebetween. When recording data in the recording / reproducing area A ₂₀ of the magneto-optical disk 2, the optical head 3 drives the magnetic head 4 by a recording-system head driving circuit 16, which will be described later, and generates a modulated magnetic field corresponding to the recording data. The data is recorded by thermomagnetic recording by irradiating the target track of the magneto-optical disk 2 to which is applied. The optical head 3 detects a focus error by, for example, a so-called astigmatism method by detecting reflected light of a laser beam applied to a target track, and detects a tracking error by, for example, a so-called push-pull method. Further, the optical head 3, when reproducing data from the read-only area A ₁₀ of the magneto-optical disc 2, it is possible to obtain a reproduced signal by detecting the light amount change of reflection light from the target track of the laser beam Then, a reproduction signal obtained by adding and synthesizing the respective detection outputs from the photodetectors 36 and 37 by the first signal synthesizer 38 is output via a changeover switch 40. Also, when reproducing data from the recording and reproducing area A ₂₀ of the magneto-optical disc 2, to obtain a reproduced signal by detecting the difference in polarization angle of the reflected light from the target track of the laser beam (Kerr rotation angle) The switch 40 outputs a reproduced signal obtained by subtracting and synthesizing each detection output from the photodetectors 36 and 37 by the second signal synthesizer 39. Here, the changeover switch 40 is controlled by a system controller 7, which will be described later, according to each operation mode.

The output of the optical head 3 is supplied to an RF circuit 5 as shown in FIG. The RF circuit 5 extracts a focus error signal and a tracking error signal from the output of the optical head 3 and supplies the extracted signal to the servo control circuit 6 and binarizes the reproduced signal and supplies it to a reproducing system decoder 21 to be described later. .

The servo control circuit 6 comprises, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, a thread servo control circuit and the like. The focus servo control circuit performs focus control of the optical system of the optical head 3 so that the focus error signal becomes zero. Also,
The tracking servo control circuit performs tracking control of the optical system of the optical head 3 so that the tracking error signal becomes zero. Further, the spindle motor servo control circuit controls the spindle motor 1 so as to rotate the magneto-optical disk 2 at a predetermined rotation speed (for example, a constant linear speed). Further, the thread servo control circuit moves the optical head 3 and the magnetic head 4 to a target track position of the magneto-optical disk 2 specified by the system controller 7. The servo control circuit 6 that performs such various control operations supplies information indicating the operation state of each unit controlled by the servo control circuit 6 to the system controller 7.

The system controller 7 is connected to a key input operation unit 8 and a display unit 9. The system controller 7 controls a recording system and a reproduction system in an operation mode specified by operation input information from the key input operation unit 8. Also, this system controller 7
Manages a recording position and a reproduction position on the recording track traced by the optical head 3 and the magnetic head 4 based on address information in sector units reproduced from the recording track of the magneto-optical disk 2. The system controller 7 reads the TO read from the lead-in area A ₁₂ of the read-only area A ₁₀ of the magneto-optical disk 2.
C data is stored in the TOC memory 20 and the TO
Data area A of read-only area A ₁₀ based on C data
₁₁ playback positions are managed. Further, the system controller 7 controls the recording / reproducing area A of the magneto-optical disk 2.
_The TOC data read from the ₂₀ lead-in area A ₂₂ is stored in the TOC memory 20 and the data area A ₂₁ of the recording / reproducing area A ₂₀ is stored based on the TOC data.
Manages the recording and playback positions for In the recording mode, the data area A of the recording / reproducing area A ₂₀ is used.
_The TOC data table indicating the recording position and the like of the TOC ₂₁ as described above is automatically generated in the TOC memory 20.
The OC data at the end of the recording mode performs control to record to the lead-in area A _22.

The recording system of this optical disk recording / reproducing apparatus is an A / D system in which an analog audio signal _AIN is supplied from an input terminal 10 via a low-pass filter 11.
A converter 12 is provided.

[0039] The A / D converter 12 quantizes the audio signal _{A IN,} 2ch × 16bit × _44.1kH
Digital audio data having a data rate of z の 1.4 Mbit / s is formed. The digital audio data obtained from the A / D converter 12 is ATRAC (Ad
aptive Transform Acoustic Coding) is supplied to the encoder 13.

[0040] The ATRAC encoder 13, the digital audio data of the data rate of 1.4M bit / s for the audio signal _{A IN} quantized by the A / D converter 12, 1 data for up to about 20ms
As a block, the waveform on the time axis is analyzed into about 1,000 components on the frequency axis by so-called orthogonal transformation, and the frequency components that are important for hearing are extracted in order to generate digital audio data having a data rate of 300 kbit / s. .
That is, the digital audio data having the data rate of 1.4 Mbit / s is compressed to 1/5 the digital audio data having the data rate of 300 kbit / s. This allows the data transfer speed to be reduced to a standard CD
-Convert from 75 sectors / sec in DA format to 15 sectors / sec.

The memory 14 is controlled by the system controller 7 to write and read data. The memory 14 temporarily stores the compressed audio data supplied from the ATRAC encoder 13, and stores the compressed audio data on the disk as necessary. Is used as a buffer memory for recording in That is, the compressed audio data supplied from the ATRAC encoder 13 has a data transfer rate reduced to 1/5 of the standard data transfer rate of 75 sectors / second, that is, 15 sectors / second. Data is continuously written to the memory 14. For this compressed data, it is sufficient to record one sector for every five sectors. However, such recording every five sectors is practically impossible. Therefore, continuous recording of sectors as described later is performed. This recording is performed over a predetermined plurality of sectors (for example, 32 sectors + several sectors) through the idle period.
Are performed in bursts at a data transfer rate of 75 sectors / second using a cluster consisting of That is, in the memory 14, 15
Compressed audio data written continuously at a low transfer rate of (= 75/5) sectors / second is read out as recording data in a burst at the transfer rate of 75 sectors / second. The overall data transfer rate of the read and recorded data, including the recording pause period, is 15
Although the speed is as low as sector / second, the instantaneous data transfer speed within the time of the burst recording operation is 75 sectors / second.

The compressed audio data, ie, the recording data, read out from the memory 14 in a burst at the transfer rate of 75 sectors / second is supplied to an encoder 15. Here, in the data string supplied from the memory 14 to the encoder 15, a unit continuously recorded in one recording is a cluster composed of a plurality of sectors (for example, 32 sectors) and a cluster arranged before and after the cluster. There are several sectors for connection. The cluster connection sector is set to be longer than the interleave length in the encoder 15 so that even if interleaved, data in other clusters is not affected.

That is, the recording data (data read from the memory 14) in this optical disk recording / reproducing apparatus is clustered into a fixed number of sectors (or blocks), and a number of cluster connection clusters are provided between these clusters. Such a sector is arranged. More specifically, as shown in FIG. 9, the cluster C includes 32 sectors (blocks) B0 to B31 and one subcode sector S.
And three connecting (linking) sectors L1 to L3, for a total of 36 sectors.
Is connected to the next cluster via. Here, when one cluster, for example, the k-th cluster C _k is recorded, 32 sectors B0 to B of this cluster C _k are recorded.
31 and not one subcode sector S only, the cluster _{C k-1} side of the two sectors L2, L3 (run - in blocks) and one sector of the cluster _{C k + 1} side L1
(Run-out block), and recording is performed in units of a total of 36 sectors. At this time, the recording data of these 36 sectors is sent from the memory 14 to the encoder 15, and the encoder 15 performs an interleaving process, thereby rearranging the data by a maximum of 108 frames (corresponding to about 1.1 sectors). Although is performed, the data in the cluster C _k are the run - run from the in-block L2, L3 - which falls well within the range up out block L1, other cluster C _k-1 and C _{k + 1} Has no effect on The linking sectors L1 to L3 are provided with dummy data such as 0, for example, so that the interleave processing can avoid adverse effects on the original data.

By performing such recording in cluster units, it is not necessary to consider mutual interference due to interleaving with other clusters, and data processing is greatly simplified. Also, if the recording data cannot be recorded normally at the time of recording due to defocus, tracking deviation, other malfunction, etc., re-recording can be performed in cluster units, and if effective data reading cannot be performed during reproduction, Re-reading can be performed in cluster units.

The encoder 15 performs encoding processing (parity addition and interleaving processing) for error correction, EFM encoding processing, and the like on the recording data supplied in bursts from the memory 14 as described above. The recording data that has been subjected to the encoding processing by the encoder 15 is supplied to the magnetic head drive circuit 16. This magnetic head drive circuit 16
Is connected, and drives the magnetic head 4 so as to apply a modulation magnetic field according to the recording data to the magneto-optical disk 2.

The system controller 7 performs the above-described memory control for the memory 14 and stores the recording data, which is read from the memory 14 in a burst manner by the memory control, on the recording track of the magneto-optical disk 2. The recording position is controlled so as to continuously record. The control of the recording position is performed by the system controller 7 managing the recording position of the recording data read from the memory 14 in a burst manner, and transmitting a control signal designating the recording position on the recording track of the magneto-optical disk 2. This is performed by supplying the servo control circuit 6.

That is, in this optical disk recording / reproducing apparatus, the digital data obtained from the A / D converter 12 has a sampling frequency of 44.1 k as described above.
Hz, quantization bit number 16 bits, data transfer rate 75
This is audio PCM data of sector / second. This is A
The data is sent to the TARC encoder 13 and output as compressed audio data of 15 sectors / second with a data transfer rate of 1/5. This ATRAC encoder 13-1
The compressed audio data continuously output at a transfer rate of 5 sectors / second is supplied to the memory 14.

Then, the system controller 7
As shown in FIG. 10, by continuously incrementing the write pointer W of the memory 14 at a transfer rate of 15 sectors / second, the compressed audio data is continuously stored in the memory 14 at a transfer rate of 15 sectors / second. writing,
When the data amount of the compressed audio data stored in the memory 14 exceeds a predetermined amount K, the read pointer R of the memory 14 is burst-incremented at a transfer rate of 75 sectors / sec. From the compressed audio data as recording data to a predetermined amount K
Only the memory control is performed such that the data is read out in bursts at the transfer rate of 75 sectors / second.

By the memory control by the system controller 7, the compressed audio data continuously output from the ATRAC encoder 13 at a transfer speed of, for example, 15 sectors / second is transferred at the transfer speed of 15 sectors / second. Write to the memory 14, this memory 1
When the data amount of the compressed audio data stored in the memory 4 exceeds a predetermined amount K, the compressed audio data is read out from the memory 14 as recording data in bursts at a predetermined amount K at a transfer rate of 75 sectors / sec. With this configuration, input data can be continuously written to the memory 14 while securing a data write area of a predetermined amount or more in the memory 14 at all times.

Here, the recording data read out from the memory 14 in a burst manner is controlled by controlling the recording position on the recording track of the magneto-optical disk 2 by the system controller 7 so that the recording track of the magneto-optical disk 2 is recorded. The above can be recorded in a continuous state. Further, as described above, since a data write area of a predetermined amount or more is always secured in the memory 14, the system controller 7 detects that a track jump or the like has occurred due to disturbance or the like, and Even when the recording operation is interrupted, the input data is continuously written in the data write area equal to or more than the predetermined amount, during which the return processing operation can be performed, and the input data is recorded on the recording track of the magneto-optical disk 2. It can be recorded in a continuous state.

Next, a reproducing system in the optical disk recording / reproducing apparatus will be described.

This reproducing system is for reproducing the recorded data continuously recorded on the recording tracks of the reproduction-only area A ₁₀ and the recording / reproduction area A ₂₀ of the magneto-optical disk 2. The reproduction output obtained by tracing the recording track of the magneto-optical disk 2 with a laser beam, that is, the reproduction of the reproduction-only area A ₁₀ output through the first signal synthesizer 38 and the changeover switch 40 Signal or second signal combiner 3
9 includes a decoder 21 to which a reproduction signal of the recording / reproducing area A ₂₀ output from the changeover switch 40 through the changeover switch 40 is binarized by the RF circuit 5 and supplied.

The above-mentioned decoder 21 corresponds to the above-mentioned encoder 15 in the above-mentioned recording system.
The reproduction output binarized by the F circuit 5 is subjected to processing such as the above-described decoding processing for error correction and EFM decoding processing to reproduce the above-described compressed audio data at a transfer rate of 75 sectors / sec. . The reproduction data obtained by the decoder 21 is supplied to the memory 22. In the memory 22, the writing and reading of data are controlled by the system controller 7, and the reproduced data supplied from the decoder 21 at a transfer rate of 75 sectors / second is written in a burst at the transfer rate of 75 sectors / second. It is. Further, in the memory 22, the reproduction data written in a burst at the transfer rate of 75 sectors / second is continuously read at a transfer rate of 15 sectors / second.

The system controller 7 reads the read-in area A of the read-only area A ₁₀ of the magneto-optical disk 2.
TOC read out from the TOC data and the recording and reproduction area _{A 2 0} of the lead-in area _{A 22} that is read from the ₁₂
The data is stored in the TOC memory 20 and the T
Based on the OC data, the data area A ₁₁ of the read-only area A _{10 and} the data area A of the record / play area A <sub>20
21. The</sub> recording position and the reproduction position with respect to ₂₁ are managed.

Then, the system controller 7
Memory control is performed such that the reproduced data is written to the memory 22 at a transfer rate of 75 sectors / second, and the reproduced data is continuously read from the memory 22 at a transfer rate of 15 sectors / second. The reproduction position is controlled so that the reproduction data written in a burst from the memory 22 by the control is continuously reproduced from the recording track of the magneto-optical disk 2. The reproduction position is controlled by managing the reproduction position of the reproduction data read from the memory 22 in a burst manner by the system controller 7.
This is performed by supplying a control signal designating a reproduction position on the recording track to the servo control circuit 6.

That is, the system controller 7
As shown in FIG. 11, the write pointer W of the memory 22 is incremented at a transfer rate of 75 sectors / second, and the reproduced data is written into the memory 22 at a transfer rate of 75 sectors / second. 22, the read pointer R is continuously incremented at a transfer rate of 15 sectors / second, and the reproduced data is continuously read from the memory 22 at a transfer rate of 15 sectors / second.
When the write pointer W) catches up with the read pointer R, the writing is stopped, and when the data amount of the reproduction data stored in the memory 22 becomes a predetermined amount L or less, the writing in the memory 22 is performed. The pointer W is burst-incremented at a transfer rate of 75 sectors / second to perform memory control.

By the memory control by the system controller 7, the compressed audio data reproduced from the recording track of the magneto-optical disk 2 is stored in the memory 7.
The memory 22 is burst-wise at a transfer rate of 5 sectors / second.
And the compressed audio data is continuously read from the memory 14 as reproduction data at a transfer rate of 75 sectors / second. Therefore, a data read area of a predetermined amount L or more is always stored in the memory 22 with respect to the memory 22. While reproducing data can be continuously read from the memory 22. The memory 2
The reproduction data read in bursts from the magneto-optical disk 2 is reproduced in a continuous state from the recording tracks of the magneto-optical disk 2 by controlling the reproduction position on the recording tracks of the magneto-optical disk 2 by the system controller 7. Can be. Further, as described above, since a data read area of a predetermined amount L or more is always secured in the memory 22, the system controller 7 detects that a track jump or the like has occurred due to disturbance or the like, and Even when the reproduction operation for the second is interrupted, the reproduction data can be read from the data read area having the predetermined amount L or more and the output of the analog audio signal can be continued, and during that time, the return processing operation can be performed.

The compressed audio data obtained as reproduction data continuously read from the memory 22 at a transfer rate of 15 sectors / second is supplied to the ATRAC decoder 23. The ADPCM decoder 23 corresponds to the ATRAC encoder 13 of the recording system. An operation mode is designated by the system controller 7, and the optical disk recording / reproducing apparatus expands the compressed audio data by 5 times to increase the data rate by 75%. Digital audio data with a transfer rate of sector / second is reproduced. This ATRA
The digital audio data is converted by the C decoder 23 into
It is supplied to the D / A converter 24.

The D / A converter 24 is provided with the ATRAC
The digital audio data supplied from the decoder 23
Analog audio signal A
_OUTTo form Obtained by the D / A converter 24
Analog audio signal A _OUT Is a low pass
The data is output from the output terminal 26 via the filter 25.

[0060] In the reproducing system of the optical disk recording and reproducing apparatus of this embodiment, the digital output function includes a digital output digital audio data by the ATRAC decoder 23 as a digital audio signal D _OUT via a digital output encoder 27 The signal is output from the terminal 28.

As described above, in the optical disk recording / reproducing apparatus of this embodiment, the recording / reproducing area A of the optical disk 2 is used.
₂₀ is a data area A in which data such as performance information is recorded.
₂₁ and a lead-in area A ₂₂ provided on the inner peripheral side thereof.
Has bets, as TOC data indicating the recording position or recording contents of data recorded in the data area A _21, the track number information indicating a sequence of recording data recorded in each data area, the data The address information indicating the position of the area and the connection address information indicating the connection destination from one data area to another data area are stored in the lead-in area A _22.
Therefore, a series of recording data can be divided and recorded in a plurality of data areas. Further, based on the TOC data read from the lead-in area A _22, by managing the reproducing position of the data area A _21, a set that has been recorded in a plurality of data area of the recording area A ₂₀ Can be reproduced.

[0062] Here, in the above embodiment, the lead-in area of the above-described FIG track number table and the recording and reproduction area A ₂₀ a TOC data generated on the TOC data table having the address table as shown in A ₂₂
, But as shown in FIG.
The TOC data in the MO format is provided with a connection flag area indicating whether or not there is a connection destination from one data area to another data area.
The n address information and binding flag indicating the plurality of recording positions with respect to the recording data as TOC data may be recorded in the lead-in area A _22.

[0063]

As described above, in the disk according to the present invention, a continuous recording data unit is divided into discretely recordable data areas; track number information corresponding to the recording data units; It is composed of address information indicating the recording position of a recording data unit recorded discretely and recorded, and coupling information from one recording data of the recording data unit divided and discretely recorded to another recording data. Since it has a management area in which management information is recorded, a series of recording data can be recorded and reproduced through a data area in which discrete recording is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of an optical disc recording / reproducing apparatus for recording / reproducing a disc according to the present invention.

FIG. 2 is a schematic plan view for explaining a structure of a magneto-optical disk used in the optical disk recording / reproducing apparatus.

FIG. 3 is a diagram showing a data table of TOC data recorded in a lead-in area of the magneto-optical disk.

FIG. 4 is a diagram showing a recording state of a data area of the magneto-optical disk.

FIG. 5 is a diagram showing the contents of TOC data corresponding to the recording state of the data area shown in FIG. 4;

FIG. 6 is a diagram showing a recording state of the data area when the third performance information is recorded from the recording state of the data area shown in FIG. 4;

FIG. 7 is a diagram showing the contents of TOC data corresponding to the recording state of the data area shown in FIG. 6;

FIG. 8 is a block diagram showing a configuration of an optical head used in the optical disk recording / reproducing apparatus.

FIG. 9 is a diagram showing a format of a cluster structure of recording data to be recorded in a recording / reproducing area of the magneto-optical disk.

FIG. 10 is a diagram showing a state of a memory whose memory is controlled in a recording system of the optical disc recording / reproducing apparatus.

FIG. 11 is a diagram showing a state of a memory whose memory is controlled in a reproducing system of the optical disk recording / reproducing apparatus.

FIG. 12 is a diagram showing another example of TOC data recorded in the lead-in area of the disc according to the present invention.

FIG. 13 is a diagram showing a recording state of a data area on a conventional disk.

FIG. 14 is a diagram showing the contents of TOC data corresponding to the recording state of the data area shown in FIG.

[Explanation of symbols]

2 magneto-optical disk, 3 optical head, 4 magnetic head, 6 servo control circuit, 7 system controller,
12 A / D converter, 13 ATRAC encoder, 1
4 memories, 15 encoders, 16 magnetic head drive circuits, 20 TOC memories, 21 decoders, 22 memories, 23 ATRAC decoders, 24 D / A converters,
A ₁₀ reproduction-only _{area, A 20} recording and reproduction _{area, A 21}
Data _{area, A 22} lead-in area

Claims (1)

[Claims] 1. A data area in which a continuous recording data unit can be divided and recorded discretely, track number information corresponding to the recording data unit, and a recording data unit divided and recorded discretely. It has address information indicating a recording position, and a management area in which management information is recorded, which is composed of information for combining one piece of recording data of the recording data unit divided and discretely recorded with other recording data. Become a disk.