JP2001014812A - Recorder and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently restore a digital signal damaged by variations during recording. SOLUTION: A digital audio signal is supplied to an audio compression encoder/decoder 25, and the compressed signal is saved once in DRAM 27 (Dynamic Random Access Memory) via a memory controller 26 and them supplied to EFM and CIRC encoder/decoder 28. Moreover, a signal from an optical pickup 13 is supplied to an address decoder 31, and an address is supplied to EFM and CIRC(Cross Interleave Lead Solomon Code) encoder/decoder 28, and a position for recording and reproducing data is controlled according to this address data. When a servo circuit 15 detects that the optical pickup 13 has moved stepping over the track of the disk 11B and a system controller 17 judges therefrom that the addresses are not consecutive on the disk 11B, the controller operates re-recording by reading out the cluster judged that recording may have been done by mistake on the area under recording before recording is started thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus and a recording method suitable for use in recording and reproducing, for example, digital audio data using a disk-shaped recording medium. More specifically, when a track on a disk facing a recording head fluctuates (so-called track jump) due to an impact or the like generated during recording, it is possible to satisfactorily repair recorded data that may be damaged. It is.

[0002]

2. Description of the Related Art As a recording apparatus for recording and reproducing digital audio data using a disk-shaped recording medium, for example, a recording apparatus having a configuration as shown in FIG. 16 has been put to practical use.

That is, FIG. 16 shows, for example, a mini disc (Mini) 2 shows a configuration of a digital signal recording / reproducing apparatus using a recording medium capable of recording / reproducing called “Disk”. In FIG. 16, the mini-disc 50 is configured by storing a disc 50B having a diameter of 64 mm in a cartridge 50A. In addition, this mini disk 50
There are three types: a read-only optical disk, a recordable magneto-optical disk, and a hybrid disk in which a read-only area and a recordable area are mixed.

Further, the cartridge 5 of the mini disc 50
A shutter (not shown) is provided at OA, and the shutter is opened when the mini disc 50 is mounted on the apparatus. In the case of a recordable magneto-optical disk, a recording magnetic head 51 is disposed facing the upper part of the disk 50B, and the optical pickup 5 is disposed below the disk 50B.
2 are arranged facing each other. In the case of a read-only optical disk, the optical pickup 52 is arranged to face the lower part of the disk 50B.

The disk 50B of the mini disk 50 is rotated by a spindle motor 53 via connection means (not shown). The rotation of the spindle motor 53 is controlled by a servo control circuit 54. Further, the optical pickup 52 is moved in the radial direction of the disk 50B by the feed motor 55. The servo control circuit 54 performs tracking control on the light beam emitted from the feed motor 55 and the optical pickup 52 and focus control on the light beam.

Further, the entire operation of this device is managed by a system controller 56 such as a microcomputer (CPU). The system controller 56 receives an input from a key 57 operated by a user, for example. The keys 57 include a power key, an eject key, a play key, a pause key, a stop key, a music selection key, a recording key, and the like.

[0007] A signal from the system controller 56 is supplied to the display 59. This display 5
Reference numeral 9 denotes time information such as the total playing time read from the mounted mini-disc, the elapsed time of the music being played, the remaining playing time of the music being played, the remaining playing time of the entire music, and the like. Is displayed. Further, for a disc on which a disc name or track name is recorded, the disc name or track name is displayed.
If the recording date and time of a song or a disc are recorded, the recording date and time are displayed.

At the time of recording, if the supplied signal is a digital audio signal, audio data and other information are separated by the digital audio interface 61 from the digital audio signal supplied to the digital input 60. Here, other information includes Cbit and Ubi
There is t, the system controller 56 reads this, the category of the signal supplied by Cbit is determined, and control according to the category is performed.

When the supplied signal is an analog audio signal, the analog audio signal supplied to the audio input 63 is A / D (Analog). to Di
digital) and supplied to a converter 64 to be converted into a digital audio signal. Here, the A / D converter 64
Is based on the specifications of the digital audio interface 61, and the supplied analog audio signal is digitized to, for example, a sampling frequency of 44.1 kHz and a quantization bit number of 16 bits.

The separated or converted digital audio signal is supplied to an audio compression encoder / decoder 65. In the audio compression encoder / decoder 65, for example, the supplied digital audio signal is reduced to about 1 /
5 data volume. As a compression technique of the digital audio signal, for example, a modified DCT (Modif) is used.
ied Discrete Cosine Tran
sform) is used.

Further, an audio compression encoder / decoder 65
The digital audio signal compressed by the DRAM is passed through a memory controller 66 to a DRAM as a temporary storage unit.
(Dynamic Random Access Me
memory) 67 once. This DRAM 67
Has, for example, a data capacity of one cluster or more (1 M bits in this example) of the recording data. Further DR
The output of AM 67 is provided to EFM and CIRC encoder / decoder 68.

The EFM and CIRC encoder / decoder 68 performs modulation for error correction and DC component removal. In the EFM and CIRC encoder / decoder 68, for example, a CIRC (Cross Interleave Re
ed Solomon Code), an EFM (8-1) for removing the DC component of the error-corrected encoded data is performed.
4 modulation).

The recording data thus formed is
Magnetic head 5 for recording via magnetic head drive circuit 69
1 is supplied. As a result, a magnetic field modulated by the recording data is applied to the disk 50B (magneto-optical disk) of the mini disk 50. Also, the laser beam from the optical pickup 52 is applied to the disc 50B of the mini disc 50.
Is irradiated. Thus, data is magneto-optically recorded on the disk 50B of the mini disk 50.

The recording of data is performed in the above-mentioned cluster unit. Here, one cluster is 36 sectors,
One sector (corresponding to one subcode block of a compact disc) is a 5.5 sound group. Also,
32 sectors in one actual cluster are valid data,
The remaining four sectors are used as a linking area for adjusting the timing of the rise of the magnetic field of the magnetic head at the start of recording and the control of the laser power.

A position on the disk at the time of recording is specified by an address recorded in a groove provided along a recording track on the disk 50B by wobble recording.
This address indicates that the signal from the optical pickup 52 is R
F (Radio (Frequency) is supplied to the address decoder 71 via the amplifier 70 and detected. Then, the address detected by the address decoder 71 is supplied to the EFM and CIRC encoder / decoder 68, and the data recording / reproducing position is controlled according to the detected address information.

Further, at the time of reproduction, a recorded signal of the disk 50B of the mini disk 50 is reproduced by the optical pickup 52, and the reproduced signal is supplied to the EFM and the CIRC encoder / decoder 68 via the RF amplifier 70. The EFM and CIRC encoder / decoder 68
The output subjected to EFM demodulation and subjected to error correction processing is temporarily stored in the DRAM 67 via the memory controller 66. Further, the output of the DRAM 67 is supplied to the audio compression encoder / decoder 65.

Here, the time required to fully read data into the DRAM 67 is about 0.9 seconds, and this data corresponds to about 3 seconds of audio data. That is, DA
When the data is fully stored in the RM 67, even if the signal of the disk 50B cannot be read, it is possible to continue outputting the reproduction signal for about 3 seconds. Then, during that time, the optical pickup is re-accessed to the original position and the signal is read again, whereby the occurrence of sound skipping can be prevented, and the optical pickup is used as a so-called shock-proof memory.

Further, an audio compression encoder / decoder 65
The data decompressed by D / A (Digital
to (Analog) The signal is supplied to the converter 72 and is returned to an analog signal. Then, this analog signal is output from the output terminal 73. Also, the system controller 56
Then, the volume data at that time can be read. From the read volume data, for example, a peak value of the level between the previous reading and the present reading can be read.

[0019]

In such a recording apparatus, if, for example, an impact is applied in a direction parallel to the recording surface of the disk 50B during recording, the magnetic head 51 and the optical pickup 52 during recording are moved to the disk 50B. May be instantaneously moved in the direction of the plane. At this time, if the magnetic head 51 and the optical pickup 52 during recording enter a recorded track other than the track being recorded, there is a possibility that data already recorded on the disk 50B may be destroyed.

That is, in this case, a magnetic field modulated by the recording data is output from the magnetic head 51 during recording.
B, and a laser beam is emitted from the optical pickup 52 to the disk 50B. Therefore, when the magnetic head 51 and the optical pickup 52 enter a recorded track other than the track being recorded by the above-described movement, so-called overwrite recording is performed on the recorded track, and the already recorded data is destroyed. There is a danger that it will be done.

On the other hand, in the above-mentioned apparatus, for example, the characteristic that the output of the error signal of the tracking control becomes zero when the optical pickup 52 crosses the groove and the continuity of the address recorded on the disk 50B are used. The movement between the tracks of the magnetic head 51 and the optical pickup 52 described above can be determined. Therefore, when the movement of the magnetic head 51 and the optical pickup 52 is determined, the recording operation is temporarily terminated, and the cluster being recorded is re-recorded.

That is, in the above-described apparatus, recording is performed in units of clusters, for example, and data of one cluster is held in the above-described DARM 67. Therefore, the DARM 67 can be read again to re-record the cluster that was being recorded. However, if the movement of the magnetic head 51 and the optical pickup 52 is, for example, as far as the previous cluster, even if such re-recording is performed, all of the destroyed data cannot be repaired. .

On the other hand, by separately providing a buffer memory for holding data of one cluster and storing, for example, data read from the immediately preceding cluster or data of the cluster recorded immediately before, Magnetic head 51
When the optical pickup 52 moves, for example, a device capable of re-recording from the immediately preceding cluster has been proposed (Japanese Patent Laid-Open No. 6-138714). In this case, the data can be restored even if the movement reaches the previous cluster.

For example, in the above-described minidisk recording apparatus, one recorded cluster is composed of the disk 50B.
The innermost circumference corresponds to about 6 tracks, and the outermost circumference corresponds to about 3 tracks. Therefore, if the detection of the movement of the magnetic head 51 and the optical pickup 52 described above can be performed within, for example, three tracks, the cluster that may be destroyed by the movement can be made up to the previous one, and the above-described cluster is destroyed. All possible data can be repaired.

However, in the device described in this publication,
For example, it is necessary to separately provide a buffer memory for holding one cluster of data. Further, for example, if an impact is applied again during the above-described re-recording, the magnetic head 51 and the optical pickup 52 may move to a further previous cluster, and in that case, it is possible to repair the destroyed data. You may not be able to. Such a continuous impact is highly likely to occur, for example, when the device is formed into a portable type or a vehicle-mounted type.

This application has been made in view of such a point, and the problem to be solved is that in the conventional apparatus, when the movement of the optical pickup or the like takes up to the previous cluster. Damaged data cannot be repaired, and the previously proposed device requires a separate buffer memory to hold the data, and repairs the damaged data when a continuous shock is applied. That they may not be able to do so.

[0027]

Therefore, according to the present invention, a digital signal temporarily stored in a memory means is intermittently read out and recorded, and an address at the time when occurrence of a track change is determined is held. Then, an error state of the recorded digital signal based on the address is detected, and re-recording is performed when it is determined that an error has occurred. When the recorded digital signal is damaged due to a change in the track, the repair can be satisfactorily performed.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention uses a memory means for temporarily storing an input digital signal, and intermittently reads out the digital signal stored from the memory means and uses a recording head. Recording means for recording on the disc, discriminating means for judging whether or not the track on the disc opposes the recording head during recording on the disc, and occurrence of track fluctuation by the discriminating means during recording on the disc And a recording head for transferring a recording head to a recorded digital signal on the disk based on the address retained by the address retaining unit when the occurrence of a track change is determined. Transfer control means for detecting an error state of a digital signal recorded after the transfer of the recording head by the transfer control means; When the detecting means determines that an error has occurred in the recorded digital signal, re-recording is performed from the digital signal in which the occurrence of the error is detected, and the error is detected in the recorded digital signal by the error detecting means. And control means for restarting recording based on the address held in the address holding means when it is determined that no occurrence has occurred.

According to a second embodiment of the present invention, an input digital signal is temporarily stored in a memory means, the stored digital signal is read out intermittently, and recorded on a disk using a recording head. During recording on the disk, it is determined whether or not the track on the disk facing the recording head has changed, and the address at which the occurrence of the track change has been determined during the recording on the disk is held. When the occurrence is determined, the recording head is transferred to the recorded digital signal on the disk based on the address held, and after the recording head is moved, an error state of the recorded digital signal is detected, and the recorded digital signal is detected. When it is determined that an error has occurred in the digital signal, the re-recording is performed from the detected digital signal, and an error occurs in the recorded digital signal. When it is determined that non is made to resume the recording based on the address held.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a digital signal recording / reproducing apparatus to which a recording apparatus and a recording method according to the present invention are applied.

FIG. 1 shows, for example, a mini disk (M
ini 2 shows a configuration of a digital signal recording / reproducing apparatus using a recording medium capable of recording / reproducing called “Disk”. In FIG. 1, a mini-disc 11 is configured by storing a disc 11B having a diameter of 64 mm in a cartridge 11A. The mini-disc 11 includes a read-only optical disc, a recordable magneto-optical disc, and a hybrid disc in which a read-only area and a recordable area are mixed.
There are different types.

Further, the cartridge 1 of the mini disk 11
1A is provided with a shutter (not shown), and the shutter is opened when the mini disk 11 is mounted on the apparatus. In the case of a recordable magneto-optical disc, a magnetic head 12 for recording is arranged above the disc 11B so as to face the disc, and the optical pickup 1 is arranged below the disc 11B.
3 are arranged facing each other. In the case of a read-only optical disk, the optical pickup 13 is arranged to face the lower part of the disk 11B.

The disk 11B of the mini disk 11 is rotated by a spindle motor 14 via connection means (not shown). The rotation of the spindle motor 14 is controlled by a servo control circuit 15. Further, the optical pickup 13 is moved in the radial direction of the disk 11B by the feed motor 16. The servo control circuit 15 performs tracking control on the light beam emitted from the feed motor 16 and the optical pickup 13 and focus control on the light beam.

Further, the entire operation of this device is managed by a system controller 17 such as a microcomputer (CPU). The system controller 17 receives an input from a key 18 operated by a user, for example. The keys 18 include a power key, an eject key, a play key, a pause key, a stop key, a music selection key, a recording key, and the like.

A signal from the system controller 17 is supplied to the display 20. The display 20 displays time information such as the total playing time read from the attached mini-disc, the elapsed time of the music being played, the remaining playing time of the playing music, the remaining playing time of the entire music, and the like. The track number etc. of the song is displayed. Further, for a disc on which a disc name or track name is recorded, the disc name or track name is displayed. If the recording date and time of a song or a disc are recorded, the recording date and time are displayed.

The system controller 17 controls the audio compression encoder / decoder 25 described later,
The exchange of data signals with the memory controller 26, the EFM and CIRC encoder / decoder 28, the RF amplifier 30, the servo control circuit 15, and the like, and the control of these circuits are performed. Thereby, for example, various operations of the entire apparatus are managed as described below.

That is, at the time of recording, for example, when the supplied signal is a digital audio signal, the digital input 2
The audio data and other information are separated by the digital audio interface 22 from the digital audio signal supplied to 1. Here, other information includes Cbit and U
There is a bit, and the system controller 17 reads this, the category of the signal supplied by Cbit is determined, and control according to the category is performed.

When the supplied signal is an analog audio signal, the analog audio signal supplied to the audio input 23 is A / D (Analog). to Di
(digital) signal is supplied to a converter 24 and converted into a digital audio signal. Here, the A / D converter 24
Is based on the specifications of the digital audio interface 22, and the supplied analog audio signal is digitized to, for example, a sampling frequency of 44.1 kHz and a quantization bit number of 16 bits.

The separated or converted digital audio signal is supplied to the audio compression encoder / decoder 25. In the audio compression encoder / decoder 25, for example, the supplied digital audio signal is approximately 1 /
5 data volume. As a compression technique of the digital audio signal, for example, a modified DCT (Modif) is used.
ied Discrete Cosine Tran
sform) is used.

Further, the audio compression encoder / decoder 25
A digital audio signal compressed by the
(Dynamic Random Access Me
memory) 27 once. This DRAM 27
Has, for example, a data capacity of one cluster or more (1 M bits in this example) of the recording data. Further DR
The output of AM 27 is supplied to EFM and CIRC encoder / decoder 28.

The EFM and CIRC encoder / decoder 28 performs error correction and modulation for removing DC components. In the EFM and CIRC encoder / decoder 28, for example, a CIRC (Cross Interleave Re
ed Solomon Code), an EFM (8-1) for removing the DC component of the error-corrected encoded data is performed.
4 modulation).

The recording data thus formed is:
Magnetic head 1 for recording via magnetic head drive circuit 29
2 is supplied. As a result, a magnetic field modulated by the recording data is applied to the disk 11B (magneto-optical disk) of the mini disk 11. Also, the laser beam from the optical pickup 13 is applied to the disc 11B of the mini disc 11.
Is irradiated. Thus, data is magneto-optically recorded on the disk 11B of the mini disk 11.

The recording of data is performed in cluster units described above. Here, one cluster is 36 sectors,
One sector (corresponding to one subcode block of a compact disc) is a 5.5 sound group. Also,
32 sectors in one actual cluster are valid data,
The remaining four sectors are used as a linking area for adjusting the timing of the rise of the magnetic field of the magnetic head at the start of recording and the control of the laser power.

The position on the disk at the time of recording is specified by the address recorded in the groove provided along the recording track on the disk 11B by wobble recording.
This address indicates that the signal from the optical pickup 13 is R
F (Radio (Frequency) is supplied to the address decoder 31 via the amplifier 30 and detected. Then, the address detected by the address decoder 31 is supplied to the EFM and CIRC encoder / decoder 28, and the recording / reproducing position of data is controlled according to the detected address information.

Further, at the time of reproduction, a recording signal of the disk 11 B of the mini disk 11 is reproduced by the optical pickup 13, and this reproduction signal is supplied to the EFM and the CIRC encoder / decoder 28 via the RF amplifier 30. The EFM and CIRC encoder / decoder 28
The output subjected to EFM demodulation and subjected to error correction processing is temporarily stored in the DRAM 27 via the memory controller 26. Further, the output of the DRAM 27 is supplied to the audio compression encoder / decoder 25.

Here, it takes about 3 seconds to completely read data into the DRAM 27, and this data is about 1 second.
This corresponds to two seconds of audio data. That is, DAR
When data is fully stored in M, the disk 11
Even if the signal B cannot be read, it is possible to continue outputting the reproduction signal for about 12 seconds. In the meantime, by re-accessing the optical pickup 13 to the original position and reading the signal again, it is possible to prevent the occurrence of sound skipping, and it is used as a so-called shock-proof memory.

Further, the audio compression encoder / decoder 25
The data decompressed by D / A (Digital
to (Analog) converter 32 to return to an analog signal. Then, this analog signal is output from the output terminal 33. Also, the system controller 17
Then, the volume data at that time can be read. From the read volume data, for example, a peak value of the level between the previous reading and the present reading can be read.

In this apparatus, the mini disk 11
On the innermost circumference of the disk 11B, a TOC (Table) in which a start address and an end address of each music on the disk, a track name as a music name, and a disk name as a disk name are written. Of Conte
ntes) is provided. In addition, mini disc 1
In No. 1, a UTOC (user TOC) is provided on a recordable disc in order to manage recorded audio signals.

The UTOC includes sector 0, sector 1,
Sector 2 is provided. That is, FIG. 2 shows the structure of sector 0. In the sector 0, the recording status of the mini disk 11 is written. In P-TNO1, a pointer on sector 0 containing the address at which the first music starts is written. That is, if 1 is set in P-TNO1, (76 + 1 * 2) * 4 bytes of sector 0 are set at the top,
The start address and end address are written. P
The same applies to -TNO2 and thereafter.

FIG. 3 shows the structure of the sector 1. Sector 1 contains information on disk name and track name. The information is an ASCII code. P
-TNA1 describes the start address on sector 1 containing the track name of the first song. That is, PT
If NA1 is 2, the track name of the first music is entered starting from (76 + 2 * 2) * 4 bytes of sector 1. P-
The same applies to TNA2 and thereafter. Disk name is sector 1
76 * 4 bytes at the top.

FIG. 4 shows the structure of the sector 2. Sector 2 is a sector for recording the date and time of recording. For compatible mini-disc recorders, it is usually recorded automatically at the same time as recording. In P-TRD1, the start address on sector 2 containing the date and time when the first music piece was recorded is written. In other words, if P-TRD1 is 3, the (76 + 3 * 2) * 4 bytes of sector 2 start,
The recording date and time of the first song are written. The same applies to P-TRD2 and thereafter. The recording date and time of the disc is 76 * 4 of sector 2.
Contains bytes first.

The sector 0 and the sector 1 of the UTOC described above.
The information of each track includes information called Link-P. The Link-P indicates where the song is connected next in sector 0, and indicates where the song name is connected next in sector 1. Therefore, by using this Link-P,
Even if a song once recorded is deleted, two songs are combined, or the number of characters of the track name is increased later, it is possible to easily cope with the problem.

In the above-described device, the DRAM 27
Are assigned as shown in FIG. That is, in FIG.
It is divided into sector areas of 68 bytes each. And TOC area, work area, ATR
An AC area is allocated. Here, TOC data of the disk 11B is taken into the TOC area. The work area is accessed only by a command from the system controller 17.

In the ATRAC area, digital audio signals compressed by the audio compression encoder / decoder 25 or reproduced from the mini-disc 11 are stored. One sector of the ATRAC area contains actual data 2
In addition to 332 bytes, a header (4 bytes), a sub-header (4 bytes), and a sync pattern (12 bytes) are arranged, and a free area of a total of 16 bytes is stored. In this empty area, the system controller 17 can read and write data.

Further, when reading / writing from / to the mini disk 11 to / from the DRAM 27 and when reading / writing from / to the audio compression encoder / decoder 25, counters are provided in units of one sector, respectively. DR using counter
A position on the AM 27 is designated. Here is the mini disk 1
DS is the counter used to specify the read / write position with 1
C, a counter used to designate a read / write position with the audio compression encoder / decoder 25 is called ASC.

The memory controller 26 fetches data from the DRAM 27 or writes data in response to a request from the audio compression encoder / decoder 25 or the minidisk 11 in accordance with an access mode specified by the system controller 17. . At this time, when reading or writing of data for one sector is completed, the memory controller 26 increases the value of the sector counter DSC or ASC by one and notifies the system controller 17 of the increment.

Further, a sector counter DSC or ASC
Has reached the set maximum number (NATMAX: determined according to the capacity of the DRAM 27 and set by the system controller 17), the value of the counter is set to zero.
Also, when notified by the memory controller 26, the system controller 17
, The value of the sector counter DSC or ASC is read out and held as variables dsc and asc.

That is, as shown in FIG. 6, for example, as shown in FIG. 6, the address value of the DRAM 27 next to the maximum value (NATMAX) of the set address value becomes 0,
This is a so-called ring buffer configuration. For example, as shown in the figure, the read / write position with the audio compression encoder / decoder 25 is indicated by a sector counter ASC, and the read / write position with the mini disk 11 is indicated by the sector counter D.
Indicated by SC. In FIG. 6, the address value increases counterclockwise.

For example, at the time of recording, the value of the sector counter DSC at the reading position on the mini-disc 11 follows the value of the sector counter ASC at the writing position from the audio compression encoder / decoder 25 as shown in FIG. You. And this sector counter DS
Unrecorded data is stored counterclockwise from the position C to the position of the sector counter ASC, and the sector counter DS
Recorded data is stored clockwise from the position C to the position of the sector counter ASC.

The sector number specified by the sector counters DSC and ASC can offset the number of sectors for the area secured as the TOC area and the work area. Thus, for example, when an area for a total of 8 sectors is secured in the TOC area and the work area, if access is performed by designating offsetting,
For example, the value 0 of the sector counter DSC means sector 8.

That is, these sector counters DSC
And the start address on the DRAM 27 of the sector specified by the ASC is offset by setting the value of the sector counter to the value Nat and the number of sectors in the TOC area and the work area to the value Ntc: Nat * 2368 When not offsetting: (Nat-Ntc) * 2368.

Further, when recording is performed in the above-described apparatus, the system controller 17 searches for an empty recording area with reference to the UTOC sector 0. Here, the empty recording area is expressed as one part descriptor. Then, the system controller 17 performs recording in the recording area indicated by the part descriptor of the empty area obtained by the search, and records the first one cluster and the last one cluster of the recording area as shown in FIG. 7, for example. Use the part excluding the cluster.

That is, at both ends of the parts descriptor, areas for recording one cluster are provided, respectively. This area is called a guard band.
When the optical pickup 13 moves across tracks of the disk 11B due to impact or the like during data recording of recording in an arbitrary recording area, the guard band extends to the recording area other than the recording area.
Is secured to prevent data that has already been recorded from being erased.

Further, in the following document, the main part of the operation in the embodiment of the present invention will be described. That is, for example, in the above-described apparatus, the mini disc 1
In contrast, when the following condition is satisfied during the recording operation,
The recording is interrupted and a rewriting operation is performed on the area where the recording was being performed.

[Satisfied Conditions] When the servo circuit 15 detects that the optical pickup 13 has moved over the tracks of the disk 11B, sets the laser power to the value at the time of reading, and notifies the system controller 17 of it. The disk 11 detected by the address decoder 31
When the system controller 17 determines that the addresses on B are not consecutive.

At this time, the following operation is performed before writing to the area being recorded. Read the cluster that has been determined to have possibly been written by mistake. At this time, if there is no uncorrectable error, the process proceeds to rewriting of the recorded cluster. If there is an error, the process proceeds to the rewriting process for the cluster.

When performing rewriting of the previous cluster, data to be written remains in the DRAM 27, and writing is performed using the data. -If writing is mistakenly performed on the rear cluster, the area is an unused area or the last one cluster (guard band) of the part descriptor, so there is no need to rewrite. Only the rewriting of the existing cluster needs to be performed.

Hereinafter, these processes will be described with reference to flowcharts. First, FIG. 8 shows a recording initialization process. In FIG. 8, in step [1], the memory controller 26 is instructed, and the sector counter DSC and the AS
Clear the value of C to 0. Here, the sector counter DSC
Indicates a sector from which data is read when data is recorded on the mini disk 11. Also, the sector counter AS
C indicates a sector for storing data from the audio compression encoder / decoder 25.

These sector counters DSC and ASC
Both generate an address on the DRAM 27. Each time the data transfer is completed, the memory controller 26 increments the value of each of the sector counters DSC and ASC.

Next, in step [2], the variable pre ds
Clear c and the variable asc to zero. Where the variable pre d
sc holds the value of the DSC that started recording. Ma
The variable asc is the audio compression encoder / decoder 25
Sector counter A storing the encoded data
A variable that holds the value of SC and stores data for one sector.
It is updated each time it is delivered. Also end the recording
Flag f_rec to represent End is cleared to 0.

In step [3], data transfer is set in the memory controller 26. If there is a request from the audio compression encoder / decoder 25, the data is transferred from the audio compression encoder / decoder 25 to the DRAM.
27 and the system controller 1
7 causes the data to be transferred from the DRAM 27 to the EFM and CIRC encoder /
Settings are made to transfer the data to the decoder 28.

Then, in step [4], the audio compression encoder / decoder 25 is instructed to start encoding.

FIG. 9 shows processing during recording. In FIG. 9, in step [11], an address is read. Here, the address obtained by decoding the address recorded on the disk 11B by the address decoder 31 is read and updated for each sector.

In step [12], a process of confirming the data encoded by the audio compression encoder / decoder 25 described later is performed. In step [13], a process of recording data stored in the DRAM 27 on the disk 11B described later is performed. Further, in step [14], it is determined whether or not the recording has been completed. If not completed, the process returns to step [11].

FIG. 10 shows a process for ending recording. In FIG. 10, in step [21], the audio compression encoder / decoder 25 is instructed to stop encoding.
Next, in step [22], a flag f_rec for notifying the recording process that recording is to be ended. Set 1 to end. Further, in step [23], the encoded
In order to finish recording all the data on the RAM 27,
The recording process described below is repeated until completion is determined in step [24].

FIG. 11 shows a process for confirming the data encoded by the audio compression encoder / decoder 25 described above. In FIG. 11, the encoding of the digital audio signal for one sector is completed in step [31], and it is checked whether or not the data transfer to the DRAM 27 has been completed. If it has not been completed, the confirmation processing ends. If the data transfer for one sector has been completed, the sector counter ASC is read in step [32] and stored in the variable asc.

Further, recording is performed in step [33].
Variable pre representing the beginning of the data One of dsc and asc
Then, in step [34], the variable pre is determined. d
Whether the difference between sc and asc is a predetermined value N or more
It is determined whether or not. That is, the DRAM 27 is a ring buffer.
Variable asc is pre dsc
If you catch up, you will overwrite the data.
You have to be careful. So the above condition
When it satisfies, the confirmation processing ends.

If none of the above conditions is satisfied, the operation for stopping the recording operation is started in step [35] on the assumption that the DRAM 27 is full. Step [3
If the variables are equal in [3], it is just after the start of the recording, and is to be excluded. Also the variable pre If dsc is smaller than the variable asc, a value NATMAX is added to the difference to determine the difference. However, if the variables catch up,
Data to be recorded may be discarded, and encoding may be continued to continue recording.

FIG. 12 is a flowchart of the recording process described above. In FIG. 12, in step [41], the amount of encoded data stored in the DRAM 27 is checked as described later. Next, in step [42],
It is checked whether data of one cluster (32 sectors) is stored. Here, since the unit to be recorded on the mini-disc 11 is one cluster, the process proceeds to the writing process of step [43] and subsequent steps only when the data is sufficient.

However, when the recording is completed in the above step [42], the data of one cluster is not always prepared for the last cluster. Therefore, in step [44], a flag f_rec indicating the end of recording is set. The end is checked, and if it is set, the process proceeds to step [43], and the writing of the last one cluster is performed. At this time, data of a portion less than one cluster is filled with 0. In step [44], the flag f_rec is set. If the end is not set, the process ends.

Further, the recording process is performed in step [43] and thereafter. First, in step [43], a cluster to be recorded is determined, and in step [45], recording is started by accessing a target address on the disk 11B. In steps [46] to [48], it is checked whether or not a phenomenon such as a so-called track jump which may hinder normal recording has occurred during recording.

That is, when the optical pickup 13 moves across tracks on the disk 11B, the tracking error (T
E) The signal fluctuates. When the servo control circuit 15 detects that the number of tracks exceeds a predetermined number of tracks (for example, 3.5 tracks) due to the fluctuation, the servo control circuit 15 changes the laser output of the optical pickup 13 to the size at the time of reading, and the system controller. 17 is notified.

Therefore, in step [46], it is checked whether or not there is this notice. If there is such notice, the process proceeds to step [49] for retry processing to be described later. Further, even if the number of tracks does not exceed the predetermined number of tracks, if the number of tracks is smaller than that, it can be detected in steps [47] and [48].

That is, the address decoder 3
1 decodes the address. Here, when the sync pattern indicating the head of the sector is detected, the sync pattern is notified to the system controller 17. Thereby, the system controller 17 reads the address from the address decoder 31. The address obtained here usually increases by one sector, but this is not the case when the optical pickup 13 moves across tracks.

In step [47], the disk 11B
The upper address is read, and in step [48], it is checked whether the continuity of the address is maintained. If they are not consecutive, the process proceeds to step [49] for retry processing described later. In step [50], it is checked whether recording of data for one cluster has been completed.
Return to and continue recording. Step [5]
Go to 1].

Further, in step [51], the output of the laser power of the optical pickup 13 is set to the value at the time of reading, and the output of the magnetic head drive circuit 29 is stopped, and
Stop recording the cluster. Step [52]
Reads the sector counter DSC and sets the variable pre d
Stored in sc. Thereby, recording of data of one cluster is completed.

FIG. 13 shows a process for checking the amount of data stored in the DRAM 27. In the process of FIG.
By comparing the values of the two sector counters, the amount of accumulated data can be calculated.

That is, in FIG. 13, step [6]
1] and the variable pre dsc and asc are compared. And the variable asc is pre If it is greater than dsc,
In step [62], the variable asc dsc is subtracted, and this is used as the data amount. On the other hand, if the variable asc is pre
If it is smaller than dsc, the variable a
sc to pre dsc is subtracted, and a value NATMAX is further added to obtain a data amount.

FIGS. 14 and 15 show one embodiment of the retry processing of the present invention. Note that these figures are divided into two parts due to space limitations, but the lines indicated by circles are connected.

This process is executed when the system controller 17 determines that there is a possibility that normal recording may not be performed during data recording on the mini disk 11. Therefore, in step [71], the recording operation is first stopped. Here, the laser power of the optical pickup 13 is set to the value at the time of reading, and the output of the magnetic head drive circuit 29 is stopped.

Next, in step [72], the address of the cluster being recorded is substituted for the variable wcluster. This value is maintained during the retry processing. In step [73], the variable wclst is set to the variable w
By substituting the value of cluster, an initial value to be retried is given. Further, in step [74], the variable wcl
It is checked whether the cluster indicated by st is the start or end address of the recording area.

In step [75], the variable p
re The difference between dsc and asc is (32 + N) sectors or more
Check if there is. The value N is determined in advance as described above.
When there is a difference of N sectors or more in the set constant, DRA
Transfer of encoded data to M27 is permitted.
You. Therefore, in the operation of step [75], the variable pre d
SC is returned by 32 sectors, and there is room for N sectors.
It is to check whether there is.

If the start or end address is found in the above step [74], since this is a cluster for which recording is not performed as a guard band, steps [76] to [7] for skipping the cluster are performed.
8]. Also, if there is no room at step [75], give up the retry of the previous cluster and give up.
The process proceeds to steps [76] to [78].

That is, in step [76], the above-mentioned variables wclst and wcluster are compared. If the variable wclst is small, it is determined that the retry of the previous cluster is being performed, and the variable wcst is determined in step [77].
1st, and the variable pre at step [78]. d
By advancing sc by 32 sectors, the state returned to the near side is returned to the original state. After the end of step [78],
If not in step [76], the process proceeds to step [91] described later.

If the retry is to be continued in the above steps [74] and [75], steps [79] to [9]
0], the previous cluster is checked and retried. That is, in step [79], the variable pre ds
Return c by 32 sectors. Where the variable pre If the value obtained by subtracting 32 from dsc becomes negative, the above value NATMAX is added. This secures recording data for the case where recording of the immediately preceding cluster was not performed normally.

Further, in step [80], the value (wcls)
t-1) Read the cluster. At this time, EFM and CI
It is assumed that an error has occurred when error correction by the RC encoder / decoder 28 cannot be performed. In step [81], it is checked whether or not there is an error in step [80]. If there is no error, the steps described below

Proceeding to [90], the retry of this cluster is not performed.

If there is an error in step [81], the previous cluster is retried in steps [82] and [83]. That is, in step [82], 1 is subtracted from the variable wclst. Then, in step [83], the disk 1 indicated by the variable wclst
Access to the address on 1B is performed, and the recording process is started.

In steps [84] and [85], it is checked whether or not impact has been detected or address discontinuity has not been detected. This is the same as the check in steps [46] to [48] in the recording process of FIG. Here, if the above detection is made, the recording process is temporarily interrupted at step [86], and further, at step [7].
4], a retry process is performed for the cluster specified by the variable wclst with 1 reduced.

If there is no impact detection or address discontinuity detection in steps [84] and [85],
In step [87], the process waits until the recording of one cluster is completed. When the recording is completed, the process proceeds to step [88]. In step [88], the output of the laser power of the optical pickup 13 is set to the value at the time of reading, the output of the magnetic head drive circuit 29 is stopped, and the recording of one cluster is completed.

Further, in step [89], the variable wcl
Since the retry processing for the cluster specified by st has been completed, 1 is added to the variable wclst. Also step

In [90], the variable pre dsc is returned for 32 sectors and the sector counter is returned to the original. Then, in step [91], the variable wclst is compared with wcluster to determine whether or not the retry of the previous cluster is being executed.

Here, the variable wclst is set to wcluster.
If it is smaller, the previous cluster is being retried, and the process returns to step [74] to continue. Otherwise, in step [92], the original variable wcl
Performs a retry process for the cluster specified by the user. In this step [92], the variable wcluster
The address on the disk 11B indicated by er is accessed to start recording.

Further, in steps [93] and [94], it is checked whether or not impact is detected or address discontinuity is not detected. This is the same as the check in steps [46] to [48] in the recording process of FIG. If there is a possibility that recording may not be performed properly here,
The recording is interrupted at step [95], and the process returns to step [73] to perform the retry processing. In step [96], 1
Wait until the recording of the cluster is completed, and when the recording is completed, proceed to step [97].

In this step [97], the optical pickup is
Set the laser power output of group 13 to the reading value
Then, the output of the magnetic head drive circuit 29 is stopped, and
The recording of the raster is ended. Step [98]
And the variable pre The dsc is advanced by 32, and the process is terminated.
The variable pre To advance dsc, the variable pre d
When 32 is added to sc and the result is equal to or greater than the value NATMAX,
This is done by subtracting the value NATMAX.

As described above, by these processes, impact is detected during recording, or address discontinuity is detected.
When there is a possibility that an already recorded track is destroyed, recording retry (re-recording) is performed on the possibly destroyed track, and this retry is performed as long as there is room in the DRAM 27. The security of the recording during the recording can be improved.

Therefore, in the above-described apparatus and method, the digital signal once stored in the memory means is intermittently read out and recorded, and the address when the occurrence of the track change is determined is held, and this address is stored in this address. Detects an error condition in the recorded digital signal based on the error and performs re-recording when it is determined that an error has occurred, causing track fluctuations during recording and damaging the recorded digital signal. Can be satisfactorily repaired in the case of occurrence.

Thus, in the conventional apparatus and method,
If the movement of the optical pickup or the like reaches the previous cluster, the damaged data cannot be repaired, and the previously proposed device requires a separate buffer memory to hold the data. However, according to the present invention, it is possible to easily resolve these problems, which may not be able to repair data that has been destroyed when a continuous impact is applied. .

That is, according to the above-described apparatus and method, the movement of the optical pickup or the like due to an impact during recording or the like is detected within the range of one cluster, and the recording operation is stopped. Up to the previous cluster. Therefore, by providing a guard band for at least one cluster at the beginning and end of the recording area defined by the parts descriptor, even if the optical pickup or the like moves due to impact or the like, data is destroyed in other recording areas. Can not be.

Further, according to the above-described apparatus and method, even when the optical pickup or the like further moves due to a re-impact during re-recording, re-recording is performed within the storage capacity of the DRAM 27. At the same time, the cluster to be re-recorded is read out first, and control is performed so that re-recording is not performed if no failure has occurred in the recorded data. It is possible to reduce the possibility that the pickup or the like moves to another cluster to cause data destruction.

Further, when the cluster to be re-recorded is a guard band, control is performed so that re-recording is not performed. For example, when a guard band is re-recorded, an impact may occur during the re-recording. Thus, it is possible to prevent the occurrence of an accident that the optical pickup or the like moves to another recording area due to the addition of data and destroys data in the other recording area.

According to the recording apparatus described above, the memory means for temporarily storing the input digital signal, and the recording means for intermittently reading the digital signal stored from the memory means and recording the digital signal on the disk using the recording head. A discriminating means for discriminating whether or not a track change on the disc facing the recording head has occurred during recording on the disc; and a discriminating means for discriminating the occurrence of the track discrepancy during the recording on the disc. Address holding means for holding an address, and transfer control means for transferring a recording head to a recorded digital signal on a disk based on the address held in the address holding means when occurrence of a track change is determined, Error detecting means for detecting an error state of a recorded digital signal after the recording head is moved by the transfer control means, and error detecting means When it is determined that an error has occurred in the recorded digital signal, re-recording is performed from the digital signal in which the error has been detected, and the error has been detected in the recorded digital signal by the error detection means. Control means for restarting recording based on the address held in the address holding means when it is determined that there is no change in the track during the recording, resulting in damage to the recorded digital signal. It is possible to realize an apparatus capable of performing a repair in a good case.

According to the recording method described above, an input digital signal is temporarily stored in a memory means, the stored digital signal is read out intermittently, recorded on a disk using a recording head, and recorded on a disk. During recording, it is determined whether or not a track change on the disk facing the recording head has occurred, and the address at which the track change has been determined during the recording on the disk is held. The recording head is transferred to the recorded digital signal on the disk based on the address held at the time of the discrimination, and an error state of the recorded digital signal is detected after the movement of the recording head, and the recorded digital signal is detected. When it is determined that an error has occurred in the signal, re-recording is performed from the digital signal in which the error was detected, and an error occurred in the recorded digital signal. If it is determined that the recorded digital signal does not exist, the recording is restarted based on the retained address, so that it is possible to satisfactorily repair the recorded digital signal in the event that a track change occurs during recording and the recorded digital signal is damaged. You can do it.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0113]

According to the first aspect of the present invention, the movement of the optical pickup or the like due to the impact during recording or the like is detected within the range of one cluster, and the recording operation is stopped. Up to the previous cluster.
Therefore, by providing a guard band for at least one cluster at the beginning and end of the recording area defined by the parts descriptor, even if the optical pickup or the like moves due to impact or the like, data is destroyed in other recording areas. Thus, it is possible to realize a recording apparatus in which no data is recorded.

According to the second aspect of the present invention, the transfer of the recording head to the recorded digital signal by the transfer control means is performed in units of an intermittent period of the read and recorded digital signal. The error detection unit detects the error state of the recorded digital signal by performing the detection on the head of the unit immediately before the unit of the digital signal, and detects the occurrence of the error by performing the detection on the unit of the digital signal. When re-recording is performed, and when the discrimination means determines the occurrence of track fluctuation during re-recording of the digital signal in which the occurrence of the error is detected, the recording head for recording the recorded digital signal by the transfer control means is used. Is further transferred to the head of the immediately preceding unit, and when the occurrence of an error is detected, further re-recording is performed, and the range for further re-recording is determined by the capacity of the memory means. Thus, even when the optical pickup or the like further moves due to a re-impact during re-recording, re-recording is performed within the range of the storage capacity and data can be satisfactorily restored. is there.

According to the third aspect of the present invention, when a recording area on a disk is formed by a plurality of units in units of an intermittent period of a digital signal to be read and recorded, the starting point of the recording area is At the end, a protection area corresponding to at least the unit length is formed, and when the transfer destination of the recording head to the recorded digital signal by the transfer control means is the protection area, the recording is performed on the address holding means without performing re-recording. By restarting recording based on the retained address,
The data can be satisfactorily restored without affecting other recording areas.

Further, according to the fourth aspect of the present invention, the movement of the optical pickup or the like due to an impact during recording or the like is detected within the range of one cluster, and the recording operation is stopped. Up to the previous cluster. Therefore, by providing a guard band for at least one cluster at the beginning and end of the recording area defined by the parts descriptor, even if the optical pickup or the like moves due to impact or the like, data is destroyed in other recording areas. It is possible to realize a recording method that is not required.

According to the fifth aspect of the present invention, the transfer of the recording head to the recorded digital signal is performed in units of the intermittent period of the digital signal to be read and recorded. The detection of the error state of the recorded digital signal is performed with respect to the head of the previous unit, and the re-recording is performed when the occurrence of the error is detected for the unit of the digital signal, If it is determined that a track change has occurred during re-recording of a digital signal in which an error has been detected, the recording head is transferred to the recorded digital signal at the beginning of the immediately preceding unit. When the occurrence of an error is detected, further re-recording is performed, and the range for further re-recording is determined by the capacity of the memory means, so that the data is restored without affecting other recording areas. In which it can be satisfactorily performed.

According to the invention of claim 6, when the recording area on the disk is formed by a plurality of units using the intermittent period of the digital signal to be read and recorded as a unit, the starting point of the recording area is When a protection area corresponding to at least the unit length is formed at the end and the transfer destination of the recording head to the recorded digital signal is the protection area, recording is performed based on the held address without performing re-recording. Is resumed, data can be satisfactorily restored without affecting other recording areas.

Thus, in the conventional apparatus and method,
If the movement of the optical pickup or the like reaches the previous cluster, the damaged data cannot be repaired, and the previously proposed device requires a separate buffer memory to hold the data. However, according to the present invention, it is possible to easily resolve these problems, which may not be able to repair data that has been destroyed when a continuous impact is applied. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a digital signal recording / reproducing device to which a digital signal processing device according to the present invention is applied.

FIG. 2 is a diagram for explaining this.

FIG. 3 is a diagram for explaining this.

FIG. 4 is a diagram for explaining this.

FIG. 5 is a diagram for explaining this.

FIG. 6 is a diagram for explaining this.

FIG. 7 is a diagram for explaining this.

FIG. 8 is a flowchart for explaining the operation.

FIG. 9 is a flowchart for explaining the operation.

FIG. 10 is a flowchart for explaining the operation.

FIG. 11 is a flowchart for explaining the operation.

FIG. 12 is a flowchart for explaining the operation.

FIG. 13 is a flowchart for explaining the operation.

FIG. 14 is a flowchart for explaining the operation.

FIG. 15 is a flowchart for explaining the operation.

FIG. 16 is a block diagram showing a configuration of a conventional digital signal recording / reproducing apparatus.

[Explanation of symbols]

11 ... mini disk, 11A ... cartridge, 11B ...
Disc, 12 magnetic head, 13 optical pickup, 14 spindle motor, 15 servo control circuit,
16: feed motor, 17: system controller, 18
... key, 20 ... display, 21 ... digital input, 2
2 Digital audio interface 23 Audio input 24 A / D converter 25 Audio compression encoder / decoder 26 Memory controller 2
7 ... DRAM, 28 ... EFM and CIRC encoder /
Decoder, 29: magnetic head drive circuit, 30: RF amplifier, 31: address decoder, 32: D / A converter, 33: output terminal

Claims (6)

[Claims] 1. A memory means for temporarily storing an input digital signal; a recording means for intermittently reading out the stored digital signal from the memory means and recording it on a disk using a recording head; Discriminating means for discriminating whether or not a change in a track on the disk facing the recording head has occurred during recording; and when the discriminating means has determined the occurrence of the track change during recording on the disc. Address holding means for holding the address of the track, and when the occurrence of the track change is determined, transferring the recording head to the recorded digital signal on the disk based on the address held by the address holding means. Transfer control means, and after the transfer of the recording head by the transfer control means, the error state of the recorded digital signal Error detecting means for notifying, when the error detecting means determines that an error has occurred in the recorded digital signal, re-recording is performed from the digital signal in which the occurrence of the error is detected, and And a control means for restarting the recording based on the address held in the address holding means when the detection means determines that no error has occurred in the recorded digital signal. 2. The recording apparatus according to claim 1, wherein the transfer of the print head to the recorded digital signal by the transfer control means is performed during the intermittent period of the read and recorded digital signal. The unit is performed with respect to the head of the unit immediately before the unit of the digital signal being recorded. When the occurrence of the error is detected, the re-recording is performed, and when the occurrence of the track variation is determined by the determination unit during the re-recording of the digital signal in which the occurrence of the error is detected, The transfer of the recording head to the recorded digital signal by the transfer control means is further performed for the head of the immediately preceding unit, and the occurrence of the error is further detected. And a range in which the further re-recording is performed is determined by a capacity of the memory unit. 3. The recording apparatus according to claim 1, wherein the recording area on the disk is formed by a plurality of units in units of the intermittent period of the read and recorded digital signal. When a protection area corresponding to at least the unit length is formed at the beginning and end of the recording area, and the transfer destination of the recording head to the recorded digital signal by the transfer control means is the protection area, A recording apparatus, wherein recording is restarted based on an address held in the address holding unit without performing the re-recording. 4. An input digital signal is temporarily stored in a memory means, and the stored digital signal is read out intermittently and recorded on a disk using a recording head. Discriminating whether or not a track change has occurred on the disk facing the disk, holding an address when the track change has been determined during recording on the disk, and determining whether the track change has occurred. The recording head is transferred to the recorded digital signal on the disk based on the held address when the recording is performed, and an error state of the recorded digital signal is detected after the recording head is moved. Performing re-recording from the digital signal in which the occurrence of the error is detected when it is determined that an error has occurred in the recorded digital signal, When it is determined that no error has occurred in the recorded digital signal, recording is restarted based on the held address. 5. The recording method according to claim 4, wherein the transfer of the recording head to the recorded digital signal is performed in units of the intermittent period of the read and recorded digital signal. The detection of the error state of the recorded digital signal is performed for the unit of the digital signal, and the occurrence of the error is detected for the head of the unit immediately before the unit of the digital signal. When the re-recording is performed, and when the occurrence of the track fluctuation is determined during the re-recording of the digital signal in which the occurrence of the error is detected, the transfer of the recording head to the recorded digital signal is performed. Is further performed on the head of the immediately preceding unit, and when the occurrence of the error is detected, the re-recording is further performed. Ri determined, recording method characterized by. 6. The recording method according to claim 4, wherein the recording area on the disk is formed by a plurality of units using the intermittent period of the read and recorded digital signal as a unit. When a protection area corresponding to at least the unit length is formed at the start end and the end of the recording area, and the destination of the recording head to the recorded digital signal is the protection area, the re-recording is performed. Without restarting recording based on the held address.