JP3466648B2 - Data recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording method and a data recording apparatus suitable for use in recording audio data on a magneto-optical disk, for example.

[0002]

2. Description of the Related Art Recently, a mini disk capable of recording and reproducing audio data on a magneto-optical disk is about to be commercialized. In this mini disc, the U-TOC data as the management information of the data recorded on the disc is not recorded in the main data area but is recorded in the U-TOC area of the recording / reproducing area. Has been done. It is possible to access a desired track from this U-TOC data.

[0003]

By the way, in this mini disc, since the U-TOC data is not recorded in the area where the original audio data is recorded, if there is an error in the U-TOC data, Another data may be recorded on the already recorded data, and the original data may be destroyed.

The present invention has been made in view of such a situation, and is intended to prevent accidental destruction of already recorded data.

[0005]

The first data record of the present invention
The recording device responds to the instruction to record data in the recording / playback area.
Management information repeatedly recorded in the management area.
Read-out means to read out and read-out means
The presence or absence of a sync signal included in the management information
1 discriminating means and management read by the reading means
Second determination for determining deviation of sync signal included in information
Means and the management information read by the reading means.
Discriminating means for discriminating whether or not the error correction is impossible.
And the duplicated data read by the reading means is recorded.
The first discriminator determines whether all of the management information
Stage, the second discriminating means, and the third discriminating means.
A fourth discriminating means for discriminating based on another result, and a fourth discriminating means.
If all the management information is determined to be abnormal by another means.
Recording, it is prohibited to record data in the recording / playback area.
Stop means is provided.

A second data recording device of the present invention is a recording / reproducing device.
In response to an instruction to record data in the raw area, repeat it in the management area.
Read-back Reads out management information recorded in duplicate
Means and the management information read by the reading means.
First determining means for determining the presence or absence of a sync signal that is
The system included in the management information read by the reading means
Second discriminating means for discriminating the shift of the link signal, and reading
Error correction to the management information read by
The third discriminating means for discriminating whether or not it is capable and the reading means.
Management information recorded repeatedly and repeatedly read by
Whether all are abnormal, the first determination means, the second
Based on the discrimination result by the discrimination means and the third discrimination means.
A fourth discriminating means for discriminating based on the
And at least one of the management information is abnormal
If it is determined that there is none, it will be repeatedly recorded in the management area.
There is no abnormality in the recorded management information by the fourth discriminating means.
And control means for rewriting the management information determined to be
It is characterized by

[0007]

[0008]

[0009]

In the first data recording device of the present invention,
In response to an instruction to record data in the recording / playback area, the management area
The management information recorded repeatedly in the
Whether or not there is a sync signal included in the read management information can be determined.
Of the sync signal included in the read management information
Misalignment is discriminated and error correction is performed on the read management information.
Whether the correctness is impossible or not is discriminated, and the read duplicate recording
Whether all of the management information provided is abnormal or not
Determined based on another result, all management information is abnormal
If it is determined that the data is recorded in the recording / playback area,
And are prohibited. In the second data recording device of the present invention
, In response to an instruction to record data in the recording / playback area,
The management information recorded repeatedly in the management area can be read.
Of the sync signal included in the management information that was issued and read.
The presence / absence is determined, and the thin information contained in the read management information
The deviation of the signal is detected and the read management information is
It is determined whether or not the error correction
Whether all of the management information recorded by
Of the management information, it is determined based on the three determination results.
When at least one management information is determined to be normal
Management information repeatedly and repeatedly recorded in the management area
However, it is rewritten with management information that is determined to be normal.
It

[0010]

1 is a block diagram showing the configuration of an embodiment of a magneto-optical disk device (mini disk device) to which the data recording method of the present invention is applied. The magneto-optical disk 2 is rotated by the spindle motor 1 at a predetermined speed. In the figure, the optical head 3 is arranged on the lower side of the magneto-optical disk 2, and the magnetic head 4 is arranged on the upper side thereof so as to face each other. The output of the optical head 3 is amplified by the amplifier 5 and then supplied to the servo control circuit 6 and the decoder 21. The servo control circuit 6 generates a signal for driving the spindle motor 1 from the input signal and a signal for driving the optical head 3 in the focusing direction, the tracking direction and the sled direction, and outputs the signals to the spindle motor 1 and the optical head 3, respectively. ing.

The decoder 21 EFMs the input signal.
It is designed to demodulate and correct errors. The output of the decoder 21 is stored in the RAM 27 via the controller 22. Then, the controller 22 reads the data stored in the RAM 27 and outputs it to the decompression circuit 23. The expansion circuit 23 expands the input data and outputs it to the D / A converter 24. D / A
The output of the converter 24 is a low pass filter (LPF) 25.
Is output from the output terminal 26 to a circuit (not shown).

On the other hand, the signal input from the input terminal 10 is input to the A / D converter 12 via the low-pass filter 11, is A / D converted, and is then supplied to the compression circuit 13 so that it is compressed. Has been done. The audio data compressed by the compression circuit 13 is temporarily stored in the RAM 17 by the controller 14. And RAM1
The data once stored in 7 is controlled by the controller 14, read out, supplied to the encoder 15, and subjected to processing such as addition of error detection code and EFM modulation.
The output of the encoder 15 is supplied to the magnetic head 4 via the magnetic head drive circuit 16.

The CPU 7 operates various operation keys 8 to control each circuit in response to an input instruction and display a predetermined display on the display 9 as necessary. Further, the TOC data read from the magneto-optical disk 2 or the TOC data input by operating the operation key 8 is stored in the TOC memory 20.

The decoder 21 is an EF that demodulates the signal output from the amplifier 5 by EFM, as shown in FIG.
M decoder 31, CIRC decoder 32 for detecting and correcting an error from the output of EFM decoder 31, and CIRC
A CD-ROM decoder 33 that performs a decoding process corresponding to the CD-ROM format from the output of the decoder 32.
From the output of the CD-ROM decoder 33,
It is configured by a sync (SYNC) detection circuit 34 that detects an M sync. All of these circuits are CPUs
Connected to 7.

The magneto-optical disk 2 is formatted as shown in FIG. 3, for example. That is, in the innermost circumference,
A lead-in area A ₁ is formed and a recording / reproducing area A ₂₁ is formed on the outer circumference thereof. This recording / reproducing area A
Some of the ₂₁ is a U-TOC area A _{21 1.} A lead-out area A ₂₂ is formed further on the outer periphery of the recording / reproducing area A ₂₁ .

The magneto-optical disk 2 is formed in the lead-in area A ₁ as a prepit by, for example, embossing.
Of the TOC data is a pre-recorded pre-pit area. Therefore, the user cannot record data in this lead-in area A ₁ .

On the other hand, the recording / reproducing area A ₂₁ and the lead-out area A ₂₂ are groove areas in which grooves having a magneto-optical film are formed. However, in the lead-out area A ₂₂ , only the lead-out data is recorded in advance, and the user cannot record the data there. In addition, U-TOC area A
U-TOC data is automatically recorded in the ₂₁₁ , so that the user can record desired audio data in the recording / reproducing area A ₂₁ excluding the U-TOC area A _211. Has been done.

In the recording / reproducing area A ₂₁ , data is recorded in units of clusters. This cluster is composed of 36 sectors as shown in FIG. The first 3 sectors are linking sectors, and the next 1 sector is a sub-data sector. The remaining 32 sectors are the main data sectors.

Run-in, linking, and run-out data are recorded in the linking sector. Text data is recorded in the sub data sector, and audio data is recorded in the main data sector.

In the lead-in area A ₁ , this linking sector is not provided, but four sub-data sectors are provided. In the sub-data sector of the lead-in area A ₁ , graphic data as well as text data can be recorded.

The above-mentioned one sector is equal to one CD-ROM block and one subcode block.

Data of the format shown in FIG. 5 is recorded in the 0th (00H) sector of the main data sector in the lead-in area A ₁ . As shown in the figure, the first 4x4 bytes are the header,
The following 23,326 bytes are used as a data area. A 12-byte sync is arranged in the header.
In addition, the data area includes the U-TOC area A shown in FIG.
The start address of ₂₁₁ is recorded. UT
The OC area A ₂₁₁ is formed by 3 clusters from this start address.

[0023] FIG. 6 shows the format of a sector of U-TOC region the main data sector sector number 0 of A ₂₁₁ (00H). As shown in the figure, the first 16 bytes are used as a header, and the subsequent 2336 bytes are used as a data area. A CD-ROM sync is recorded in the header. In this CD-ROM sync, the first 1 byte and the last 1 byte are all made up of logical 0 bits, and all 10 bytes between them are logical 1.
It consists of a bit of.

In this data area, the cluster number (cluster H, cluster L) and the start address pointer (P-TNO) of each track n are recorded.
n) etc. are recorded.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIG.
This will be described with reference to the flowchart in FIG. When the key 8 is operated to input a recording command, the CPU 7 starts the process shown in the flowchart of FIG.

When the magneto-optical disk 2 is loaded before the processing of FIG. 7 is started, the TOC data reading operation is executed. That is, the CPU 7 controls the spindle motor 1 via the servo control circuit 6, and the magneto-optical disk 2
Is rotated at a predetermined speed. Then, the optical head 3 is controlled via the servo control circuit 6 to irradiate the magneto-optical disk 2 with laser light to reproduce the TOC data recorded in the lead-in area A ₁ of the magneto-optical disk 2. .

The TOC data is supplied to the decoder 21 via the amplifier 5 and EFM demodulated by the EFM decoder 31. The CIRC decoder 32 performs error detection and correction processing on the output of the EFM decoder 31, and then outputs the output to the CD-ROM decoder 33. CD-RO
The M decoder 33 converts the input data from the CD-ROM format to a normal format. Then, the output of the decoder 33 is R via the controller 22.
Deployed to AM27. The data expanded by the RAM 27 is read by the controller 22 and the CPU 7
Is supplied to and stored in the TOC memory 20 via. In this way, the lead-in area A ₁ is stored in the TOC memory 20.
The TOC data stored in is written.

Next, when a recording operation is instructed, the CPU
7 in step S1, the read address of the U-TOC area A ₂₁₁ stored in the TOC memory 20, the optical head 3 and controls the servo control circuit 6, is accessed that location. Then, the U-TOC data stored in the U-TOC area A ₂₁₁ is reproduced. This data is supplied from the optical head 3 to the controller 22 via the amplifier 5 and the recorder 21, and is expanded in the RAM 27, as in the case of reading the TOC data. And
The TOC of the TOC memory 20 read from the RAM 27
It is written in the area where no data is recorded. In this way, in addition to TOC data, TOC memory 20
-TOC data is also stored.

Next, in step S2, it is determined whether or not there is an abnormality in the U-TOC data. This U-TOC data is the CD when the CD-ROM sync is not detected.
-Even if the ROM sync is detected, if its position deviates from its original position, or again, the U-TOC
When an uncorrectable error is detected in the data, it is determined to be abnormal.

That is, the EFM decoder 31 in the decoder 21 receives the U-TOC data supplied from the amplifier 5 as E.
FM demodulates and outputs to the CIRC decoder 32. CIR
The C decoder 32 detects an error in the EFM-demodulated data and corrects it if it is correctable. Then, when the correction is impossible, a flag is output to the CPU 7. This allows the CPU 7 to know that there is an uncorrectable error.

The data error-corrected by the CIRC decoder 32 is further supplied to the CD-ROM decoder 33 to decompose the CD-ROM format data.
The sync detection circuit 34 detects the CD-ROM sync described with reference to FIG. 6 from the output of the CD-ROM decoder 33. When this sync is not detected, or even if it is detected, if the detected position is not the position that should be originally detected, the sync detection circuit 34 sets a flag. The CPU 7 can detect the presence or absence of the CD-ROM sync or the deviation thereof from this flag.

[0032] then proceeds to step S3, for all three clusters of U-TOC area A _211, whether the determination of the presence or absence of abnormality been finished is determined. When the process of step S2 is not executed for all three clusters, the process returns to step S2 and the process is executed. When the presence / absence of abnormality is determined in step S2 for all three classes, the process proceeds from step S3 to step S4, and for all three clusters, any one of the above three abnormalities is present. It is determined whether or not.

[0033] As described above, the three clusters of U-TOC area A _211, the same U-TOC data are recorded. Of these three clusters, for example, it is determined whether or not any one of the three abnormalities is present in the first cluster. Second and third
The same process is repeated for the second cluster. Then, when one or more abnormalities have been detected for all three clusters, the process proceeds from step S4 to S5, and disk error processing is executed. At this time, for example, the CPU 7 ejects the magneto-optical disk 2. Then, the display 9 displays that the magneto-optical disk 2 is abnormal. As a result, the recording operation on the magneto-optical disk 2 is substantially prohibited.

That is, since at least one anomaly is found in each of the three clusters, this U-TO
The C data may be incorrect. If data is recorded at a predetermined address of the recording / reproducing area A ₂₁ based on this U-TOC data, the data already recorded there may be erroneously destroyed. Therefore, in order to prevent this, the recording operation is substantially prohibited.

When it is determined in step S4 that at least one cluster has no abnormality, the process proceeds to step S6 and the recording process is executed. Then, in step S7, it is determined whether or not the recording operation is completed. When it is determined that the recording operation is completed, the process proceeds to step S8, and the cluster rewriting process is executed.
That is, the CPU 7 adds the U-TOC data corresponding to the data recorded in step S6 to the U-TOC data stored in the TOC memory 20, and the correct U-TOC data is added.
UT of the cluster where no abnormality was found in C data
While rewriting the OC data, the U-TOC data of the cluster in which the abnormality is found is also rewritten.

The rewriting process of the cluster is performed after the recording operation of the recording / reproducing area A ₂₁ is completed.
It is also possible to do this before executing this recording operation.

The details of the recording process in step S6 will be described below. That is, the audio data supplied from the input terminal 10 at this time is A / D converted by the A / D converter 12 after being limited to a predetermined frequency band by the low pass filter 11. A / D
The digital audio data A / D converted by the converter 12 is supplied to the compression circuit 13 and compressed. Then, the compressed data is stored in the RAM by the controller 14.
It is temporarily stored in 17.

Since the digital data is temporarily stored in the RAM 17, even if the data supplied to the input terminal 10 is temporarily interrupted, the recorded data may be interrupted within the time corresponding to the capacity of the RAM 17. Can be prevented.

The data read from the RAM 17 is supplied to the encoder 15 and converted into a CD-ROM format, and then an error detection / correction code is added to the EFM.
It is modulated and supplied to the magnetic head 4 via the magnetic head drive circuit 16. At this time, since the optical head 3 is radiating the laser light, the digital audio data is recorded on a predetermined track of the recording / reproducing area A ₂₁ of the magneto-optical disk 2.

On the other hand, Oite the reproduction mode to reproduce the audio data which the optical head 3 is recorded in the recording and reproduction area A21 of the magneto-optical disc 2. This audio data is supplied to the decoder 21 via the amplifier 5, and the EF
After the M demodulation and error correction processing is performed, the controller 2
The data is temporarily stored in the RAM 27 via 2. as a result,
Even if the optical head 3 causes a so-called needle jump due to a shock or the like, if the optical head 3 returns to the original reproduction position within the time corresponding to the capacity of the RAM 27, R
Data can be continuously read from the AM 27.

The data read from the RAM 27 is supplied to the decompression circuit 23, decompressed, and then the D / A converter 24.
Is D / A converted by. Then, after the unnecessary high-frequency component is further removed by the low-pass filter 25, it is output from the output terminal 26 to a circuit not shown.

[0042]

According to the first data recording apparatus of the present invention,
Is recorded according to the instruction to record data in the recording / playback area.
Management information recorded repeatedly and redundantly in the physical area
The sync signal included in the read management information
The sync signal included in the read management information
Error in the read management information
It is determined whether or not the correctness is impossible, and the duplicated read is recorded.
Three judgments are made as to whether all of the management information
Judging based on the result, it is judged that all management information is abnormal.
If not, record the data in the recording / playback area.
Since it is prohibited, there is less risk of accidentally destroying already recorded data.

In the second data recording apparatus of the present invention
Is recorded according to the instruction to record data in the recording / playback area.
Management information recorded repeatedly and redundantly in the physical area
The sync signal included in the read management information
The sync signal included in the read management information
Error in the read management information
It is determined whether or not the correctness is impossible, and the duplicated read is recorded.
Three judgments are made as to whether all of the management information
At least one of the management information is determined based on the result
If it is determined that one management information is normal, the management area
If there is no abnormality in the management information recorded repeatedly and repeatedly
It is normal because it is rewritten to the determined management information.
If there is at least one management information, this
Data can be accurately recorded based on the.

[0044]

[0045]

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a magneto-optical disk device to which a data recording method of the present invention is applied.

FIG. 2 is a block diagram showing a configuration example of a decoder 21 in FIG.

FIG. 3 is a diagram illustrating a format of the magneto-optical disk 2 of FIG.

FIG. 4 is a diagram for explaining a format of clusters of the magneto-optical disk 2 of FIG.

5 is a diagram illustrating a format of data recorded in a sector of number 0 in the lead-in area A ₁ of FIG.

6 is a diagram illustrating the format of a sector number 0 of U-TOC region A ₂₁₁ in Figure 3.

FIG. 7 is a flowchart illustrating the operation of the embodiment of FIG.

[Explanation of symbols]

2 magneto-optical disk 3 optical head 4 magnetic head 7 CPU 20 TOC memory 21 decoder 34 Sync detection circuit

Claims (2)

(57) [Claims] 1. A recording / reproducing area in which data is recorded, and
To manage the data recorded in the recording / playback area
From a single area where the management information of
A data recording medium that has a management area
In the data recorder, In response to an instruction to record the data in the recording / reproducing area
The repeated recording in the management area.
Reading means for reading the physical information; The management information read by the reading means includes
A first discriminating means for discriminating the presence / absence of a sync signal to be included, The management information read by the reading means includes
Second discriminating means for discriminating the deviation of the sync signal
When, It corresponds to the management information read by the reading means.
Discriminating means for discriminating whether or not the error correction is impossible.
When, The duplicated data read by the reading means is recorded.
Whether all of the management information is abnormal is determined by the first
Determining means, the second determining means, and the third determining means.
Fourth determination based on the determination result by the determination means
Means and All of the management information is abnormal by the fourth determining means.
If it is determined that the data is stored in the recording / playback area,
Characterized by having a prohibition means for prohibiting recording
And a data recording device. 2. A recording / reproducing area in which data is recorded, and
To manage the data recorded in the recording / playback area
From a single area where the management information of
A data recording medium that has a management area
In the data recorder, In response to an instruction to record the data in the recording / reproducing area
The repeated recording in the management area.
Reading means for reading the physical information; The management information read by the reading means includes
A first discriminating means for discriminating the presence / absence of a sync signal to be included, The management information read by the reading means includes
Second discriminating means for discriminating the deviation of the sync signal
When, It corresponds to the management information read by the reading means.
Discriminating means for discriminating whether or not the error correction is impossible.
When, Repeatedly read by the reading means
Whether all of the recorded management information is abnormal,
The first discrimination means, the second discrimination means, and the front
Note that the determination based on the determination result by the third determination means
4, the determination means, By the fourth discriminating means, a small amount of the management information
If at least one piece of management information is determined to be normal,
The management information repeatedly and repeatedly recorded in the management area
Was determined to be normal by the fourth determining means.
And a control means for rewriting to management information.
Data recording device.