JPH0223532A - Data recorder - Google Patents

Abstract

PURPOSE:To utilize address information on a disk while securing the interchangeability with a CD-ROM by providing an address area of a prescribed quantity per prescribed unit on the disk, recording a physical address in a form of projection and recess in this address area in the widthwise direction of a pregroup and utilizing this address area at the time of writing data in a desired sector. CONSTITUTION:A recording track 3 on the optical disk 1 is constitutive of a land part between the progroups 2, each formed in a spiral shape, and a tracking control is carried out by the group 2. Each individual address area 4 having prescribed bytes is provided at prescribed intervals on this track 3, and a wobble-recording of the physical address is carried out by forming the projection and recess in this area 4 in the widthwise direction of the group 2. The wobble-recorded data are detected by a tetrasected detector 10 cosisting of individual detectors 10A-10D. Individual outputs SA-SD of these respective detectors 10A-10D are added up together by an adder 11 to detect a data signal RF, while an address signal ADR is detected by a multipliers 12 and 13 and a subtractor 14.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a data recording device, and is a data recording device that records data on an optical recording medium in a format compatible with, for example, a music compact disc. Related to equipment.

[Summary of the invention]

The second invention is a data recording device that records data on a recording medium in a format compatible with a compact disc, in which an address area is provided in each predetermined unit on the disc, and in this address area, unevenness is formed in a pre-group in the width direction. Form a change and record the address to save music data or CD-
In continuous recording mode, such as when recording ROM data, data can also be recorded in this address area, and intermittent recording can be performed, such as when used as a CD-WO or CD-erasable. In this mode, this address area is set as a non-recording area and this address information is left, ensuring compatibility with the CD-ROM.
When used as a CD-WO or CD-erasable disc, address information can be used.

[Conventional technology] Compact discs on which audio signals are optically recorded in digital form are widely known.

This compact disc has a diameter of 12C11, for example.
It is a recording medium that can record data of approximately 500 Mbytes or more. Therefore, this compact disc can be used as a digital data recording medium for recording a large amount of data.

Taking note of this, a CD-ROM has been standardized that allows digital data other than audio data to be recorded in the music recording area of a compact disc. CD-
Digital data is recorded in a ROM in the same manner as a music compact disc.

In such a CD-ROM, one sector (l block), which is a data recording unit, is composed of one subcode block consisting of 98 frames. That is, in a music compact disc, 8-bit subcodes from p to w (R to W are also called user's bits) are prepared per frame. This subcode is
Since one information unit (address) is made up of 98 frames, 98 frames are called a block.

A CD-ROM is basically a read-only recording medium. CD-ROMs have a large storage capacity, can be copied in large quantities, and have little information deterioration. Taking advantage of these features, CD-ROMs are used to record data on various dictionaries and research materials.

[Problem to be solved by the invention]

In recent years, write-once type optical recording media and optical recording media capable of oil removal and re-recording, such as magneto-optical disks, have been developed. It has been proposed to record digital data using such a write-once type optical recording medium or an erasable/rewritable optical recording medium in a manner similar to a compact disc. A compact disc (hereinafter referred to as CD-WO) as a write-once data recording medium, and a compact disc (hereinafter referred to as CD-WO) as an erasable and re-recordable data recording medium.
Since data can be added to and re-recorded on a CD (referred to as erasable), a playback-only CD can be used.
It can be expected to be used in a wider range of fields than D-ROM.

By the way, in CD-WO and CD-erasable, data is written/read in sector units. Therefore, when used as a CD-WO or CD-erasable disc, it is desirable to record a physical address on the disc so that data can be recorded by seeking any sector (block).

Therefore, it is conceivable to provide an address area corresponding to each sector on the disk and record a physical address in the form of bits in this address area. This allows high-speed access.

However, the standards for compact discs and CD-ROMs do not allow blank areas between sectors, and therefore, it is not possible to secure an area on the disc for recording physical addresses in the form of bits.

In other words, if addresses are recorded in the form of bits on a disc, data cannot be recorded in this address area, so data on compact discs or
The data in the D-ROM cannot be recorded as is.

Therefore, it is an object of the present invention to
It can be used when recording in continuous recording mode, such as when recording OM record data, and
In the case of intermittent recording mode in which data is recorded/reproduced sector by sector, such as when used as CD-WO or CD-erasable, addresses on the disc can be used, enabling high-speed access. It is an object of the present invention to provide a data recording device which is configured as follows.

[Means to solve the problem]

The present invention is a data recording device that records data on a data recording medium provided with an address area in which address information is recorded by changing the track width for each predetermined unit, and in which the address area is changed according to a recording mode. This data recording device has a recording area or a non-recording area.

[Effect]

Each predetermined unit (1 sector worth of data 235
The number of data is 23, which is 2 bytes minus 12 bytes of synchronization signal.
(equivalent to 40 bytes) to a specified length (equivalent to 12 bytes of synchronization signal)
An address area 4 is provided. A physical address is recorded in this address area 4 by forming unevenness in the width direction of the pregroup 2. When seeking a desired address and recording data, the address recorded in this address area 4 can be used.

In a continuous recording mode, such as when recording music data or CD-ROM data, data is also recorded in this address area 4. Since the address in the address area 4 is not recorded in bits, data can be written in the address area 4 in this way.

In the intermittent recording mode, such as when used as a CD-WO or CD-erasable disc, a 12-byte synchronization signal is not recorded, so a blank period occurs. Therefore, it is possible to provide a blank area equivalent to 12 bytes. This blank area corresponds to address area 4. Therefore, in the intermittent recording mode, the address recorded in this address area 4 remains even after data recording. When seeking a desired sector, addresses in this address area 4 can be used. This allows high-speed access.

Therefore, while ensuring compatibility with CD-ROM,
When used as a D-WO41CD-erasable disc, the physical address information of the disc I can be used.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the optical disc 1 has a diameter of, for example, 12C1.
Tracks are formed on the optical disc 1 in a spiral shape. The form of this optical disc 1 is similar to a compact disc for music.

As the optical disk 1, a write-once optical disk or an erasable/rewritable optical disk, such as a magneto-optical disk, can be used.

In this optical disc 1, the land portions between the pre-groups 2 formed in a spiral shape are used as recording tracks 3.

This pre-group 2 enables tracking control. And on this recording track 3,
An address area 4 of a predetermined length (corresponding to 12 bytes of a synchronization signal) is provided at each predetermined interval (equivalent to 2340 bytes of data obtained by subtracting 12 bytes of a synchronization signal from 2352 bytes of data for one sector). In this address area 4, a physical address is wobble-recorded.

Wobble recording is a method in which unevenness is formed in the width direction of the pregroup 2, and data is recorded by changes in the unevenness.

Such wobble-recorded data is stored in each detector IOA and IOB, as shown in FIG.

It can be detected using a four-part detector 10 consisting of 10C and IOD. That is, each detector IOA, I
Each output SA, Ss % Sc of OB, IOC, 10D
The addition output signal (Sa
The data signal RF can be detected from +3m +Se + Se).

In addition, each output SA of each detector IOA and 10B arranged in the longitudinal direction (x-x' force direction) of the recording track 3
, from the subtraction output signal (Sam-3cI) obtained by subtracting the multiplication output S□ by the multiplier 12 of 3m and the multiplication output Se by the multiplier 13 of each output 5cSSs of each detector IOC and IOD by the subtractor 14). Address signal ADH can be detected.

Data can be recorded on the optical disc 1 in two modes. One of these modes is a mode for continuous recording. The mode for this continuous recording is CD
- Suitable for use when recording ROM data as is or when handling sequential data such as music data.

In this continuous recording mode, data is recorded on the optical disc l with l subcode blocks as one sector. In other words, as shown in Figure 3, one frame consists of 24 samples, which corresponds to 6 samples each for L (left) and R (right) when audio data is sampled at 16 bits.
Symbol (1 symbol is 8 bits, EFM modulated and 1
It consists of data bits (4 channel bits), 8 symbols of parity, 1 symbol of subcode, 24 channel bits of frame sync, and margin bits for DC component suppression of 3 channel bits each.

The subcode of one symbol of each frame has eight channels P to W. One subcode block is constructed by collecting 98 subcodes of 8 channels of p-w of each frame. This subcode block is considered as one sector. Therefore, one sector corresponds to 98 frames.

Among these subcodes P to W, the P channel is used as a flag indicating the beginning. The Q channel is used as a control bit. That is, data/audio flags, addresses, track numbers, time codes, etc. are recorded in the Q channel.

One sector thus corresponds to 98 frames. The total amount of data in one sector is 6 (number of audio data) x 2 (second stereo channel) x 2 (byte unit conversion) x 98 (frame) - 2352 bytes.

Of these, 2048 bytes can be secured as user data, as shown in FIG. In other words, the storage capacity for 1 sector is 2352 bytes: ■ Synchronization signal for blocking music signals = 12 bytes ■ Information for access (block 2 minutes 9 seconds); 3 bytes ■ Mode indicating data type = 1 Byte ■ Data:
204B bytes ■ Error correction and detection code to improve data quality = 288 bytes (including 8 bytes of space) and recorded.

In the continuous recording mode, a maximum of 108 frames are interleaved and convolutional encoding is performed using CIRC (cross interleaved Reed-Solomon code). In the continuous recording mode, the DS
Margin bits are added so that V (digital sum value) is minimized, and data is recorded on the disc 1 by EFM modulation.

In such a continuous recording mode, there is no period during which data is blank, so as shown in FIG. 5, bit 5 is also formed in address area 4, and address area 4 is used as a data recording area. Since the addresses recorded in this address area 4 are wobble-recorded, they do not pose any problem when recording data.

Another mode is a mode for performing intermittent recording. The mode for performing this intermittent recording is CD-WO or C
It is suitable for use when recording data at an arbitrary address, such as when used as a D-erasable device.

In such a mode for intermittent recording, the basic data structure is the same as that for continuous recording, but the synchronization signal for blocking the 12-byte music signal in FIG. It is not provided in the mode when performing intermittent recording. That is, in the mode for performing such intermittent recording, 98 frames are taken as one sector, and data is recorded in units of sectors. Data is recorded in each sector as shown in FIG. 4, except for a synchronization signal for blocking a 12-byte music signal.

In this way, in the mode when performing intermittent recording, the synchronization signal (Sync-Patt, ern) for blocking the 12-byte music signal in FIG. 4 is not provided. Then, out of the total data capacity of 2352 bytes of one sector, a free space equivalent to 12 bytes can be secured. This free space equivalent to 12 bytes corresponds to address area 4.

Therefore, when data is recorded in the intermittent recording mode, no data is recorded in the address area 4, and the address recorded in the address area 4 remains even after the data is recorded. Therefore, when seeking a desired sector, the address recorded in the address area 4 can be used.

Note that when data is recorded in the intermittent recording mode, sector-contained encoding is performed instead of convolutional encoding. Sector-contained encoding can be realized, for example, by the method described in Japanese Patent Application No. 118567/1983. Furthermore, the connection bit when recording with EFM modulation is reset for each sector.

FIG. 6 shows an outline of a digital data recording/reproducing apparatus to which the present invention is applied. In Figure 6,
21 is an optical disc on which digital data is optically recorded/reproduced. As mentioned above, this optical disc 21 is provided with an address area 4, and this address area 4
The physical address is recorded in wobble. The optical disc 21 is rotated at CLV (constant linear velocity).

22 is a recording circuit. In this recording circuit 22, terminal 2
In response to the select signal from 6, two modes can be set, one for continuous recording and one for intermittent recording, as described above.

In the continuous recording mode, a 12-byte synchronizing signal is provided for one sector of data (see FIG. 4); in the zero-intermittent recording mode, this synchronizing signal is not provided.

During recording, data to be recorded on the optical disc 21 is supplied from the data input terminal 23 to the encoder 24 of the recording circuit 22. The address of the optical disc 21 is in the address area 4.
This can be obtained from the address information recorded in .

Therefore, it is possible to seek an arbitrary address and record data. The data from the input terminal 23 is
It is developed into a predetermined frame structure, and the encoder 24
Error correction codes are added twice to the series and the 08 series. This encoding process is a convolutional encoding process in a continuous recording mode, and a sector-contained encoding process in an intermittent recording mode. The data to which the encoder 24 doubles the error correction code is subjected to EFM modulation 11 (8-14 modification 11) in the EFM modulation circuit 25, and is recorded in a sector at a desired address of the optical disc 21.

In the continuous recording mode, data is also recorded in the address area 4 provided on the optical disc 21. On the other hand, in the intermittent recording mode, the address area 4 provided on the optical disc 21 is set as a non-recording area, and the wobble-recorded address remains in this address area 4.

When reproducing data recorded on the optical disc 21, processing is performed in the reverse sequence to that during recording described above.

That is, 30 is a reproducing circuit. The reproducing circuit 30 can set a mode for continuous recording and a mode for intermittent recording using a selection signal from a terminal 33.

Reproduction data of the optical disc 21 is supplied to an EFM demodulation circuit 31 of a reproduction circuit 30 and subjected to EFM demodulation. The output of the EFM demodulation circuit 31 is supplied to a decoder 32. The characteristics of the decoder 32 are switched depending on the case of convolutional coding and the case of block-completed coding by a select signal from a terminal 33. Decoder 32 output is output terminal 35
The reproduced data is obtained from the output of the output terminal 35.

When seeking a desired sector during playback, information on the Q channel of the subcode can be used in continuous recording mode. Note that if it is possible to separate the frequency spectrum of the address information to be wobble-recorded in the address area 4 from the frequency spectrum of the information recorded by bits and the signal for tracking, recording will be possible in the continuous recording mode. Even in this case, a desired sector can be sought using the address recorded in the address area 4.

In the case of intermittent recording mode, no data is recorded in the address area 4, and the address in the address area 4 remains, so when the desired assist position is sought, the data recorded in the address area 4 is Address available.

〔Effect of the invention〕

According to this invention, an address area of a predetermined length is provided in each predetermined unit on the disk, and physical addresses are recorded in this address area by forming irregularities in the width direction of the pre-group. When writing data to a desired sector, the address recorded in this address area can be used.

The addresses in this address area are not bit records, so when recording data in continuous recording mode, such as when recording music data or CD-ROM data, use this address area. can also record data.

Further, in a mode for performing intermittent recording, such as when used as a CD-WO or CD-erasable disc, a 12-byte synchronization signal is used as an empty area, and this empty area corresponds to the address area 4.

Therefore, in the intermittent recording mode, the address recorded in this address area 4 remains even after data recording, and when seeking a desired sector, the address in this address area 4 can be used. Therefore, high-speed access is possible.

Therefore, while ensuring compatibility with CD-ROM,
When used as D-WO or CD-erasable,
Address information on the disk can be used.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an optical disc to which the present invention is applied, FIG. 2 is a block diagram showing the configuration of an optical pickup, and FIG.
4 and 4 are route maps used to explain an embodiment of the present invention, FIG. 5 is a route map showing a data recording state, and FIG. 6 is a block diagram of an example of a data recording/reproducing device to which the present invention is applied. It is a diagram. Explanation of main symbols in the drawings 1.21: Optical disk, 3: Recording track. 4 near address area. Diagram 1 CD-ROM data format 1. Figure 4 Explanatory diagram Figure 5 W regeneration device Figure B

Claims (1)

[Scope of Claims] A data recording device that records data on a data recording medium provided with an address area in which address information is recorded by changing the track width for each predetermined unit, the address area being set in a recording mode. A data recording device that has a recording area or a non-recording area depending on the data.