JP2002008311A - Disk recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add additional data to the data remaining in a memory so as not to lose the data when a recording state is stopped in the state that the data for one cluster remains in the memory and to prevent the additional data from being erroneously reproduced and extraneous sounds from being outputted as reproducing sounds from a reproducing device or the like. SOLUTION: Whether there is the data remains in the memory or not is discriminated while recording operation is interrupted. If the data remains in the memory in accordance with the result of the discrimination, the additional data is generated so as to be a recording unit in addition to the data remaining in the memory and the generated data is added to the data remaining in the memory and is recorded on a disk and the address of the disk corresponding to the data remaining in the memory is recorded as a final address to the second recording region of the disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording method for recording an optical disk or a magneto-optical disk having a diameter of 64 mm stored in a cartridge.

[0002]

2. Description of the Related Art Diameter 64 mm stored in a cartridge
An optical disk system for recording / reproducing digital audio signals using an optical disk or a magneto-optical disk has been developed. In such an optical disk system, a digital audio signal is reduced to about 1 using an audio compression technique.
/ 5 compressed and recorded. Thereby, the diameter is 64m
It is possible to record / reproduce an audio signal of high sound quality for about 74 minutes on a small-diameter disk.

In such an optical disk recording / reproducing apparatus, at the time of data recording, it is necessary to control the laser power and the interleave length of the CIRC is longer than the length of one sector in 108 frames, so that a linking area is required. Become. For this reason, in an optical disc, 3
Recording / reproduction is performed in units of clusters composed of six sectors. Of the 36-sector cluster, data is recorded in 32 sectors. The remaining four sectors are used for linking and sub data.

At the time of reproduction, data is reproduced from an optical disk at a transfer rate higher than that of a decoder that decompresses data. This reproduced data is stored in a buffer memory (DRAM).
Is stored once. This buffer memory contains approximately 0.9
The digital signal fills in seconds. If the digital signal on the disc cannot be read due to vibration, etc.,
For about three seconds, the reproduction signal is continuously output by the data stored in the buffer memory. In the meantime, by re-accessing the optical pickup to the original position and reading the signal again, it is possible to prevent the occurrence of so-called sound skipping.

[0005]

In an optical disk in such an optical disk system, data is recorded after one cluster of data is prepared in a memory.
It takes about 2 seconds for one cluster of data to be completed.
Therefore, when the stop key is pressed during recording, the recording is terminated after waiting for the data of one cluster to be stored in the memory. If the user stops the recording, the data is stored in the memory. Until they are completed, the recording state continues, and the usability is not good.

If the stop key is pressed during recording,
If the recording state is stopped while data for the cluster remains in the memory, the data remaining in the memory will be lost, and the last part will be interrupted when data is read from the disk. Occurs.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a disk recording method which prevents data remaining in a memory from being wasted when a stop key is pressed during recording.

Another object of the present invention is to add additional data so as not to lose the data remaining in the memory when the recording state is stopped in a state where the data remains in the memory. It is an object of the present invention to provide a disk recording method that prevents an erroneous sound from being erroneously reproduced and being output as a reproduction sound from a reproduction device or the like.

[0009]

SUMMARY OF THE INVENTION According to the present invention, after an input information signal is compressed and temporarily stored in a memory, and a signal processing is performed on the compressed information signal read from the memory for each predetermined recording unit amount, The data is recorded in the first recording area of the disc, and it is determined whether or not data remains in the memory when the recording operation is interrupted. If the data remains in the memory based on the determination result, the data remaining in the memory is determined. And generate additional data so as to be a recording unit, and add the generated additional data to the data remaining in the memory.
This is a disk recording method of recording data on a disk and recording the address of the disk corresponding to the data remaining in the memory as a final address in a second recording area of the disk.

It is determined whether or not data remains in the memory when the recording operation is interrupted. If data remains in the memory based on the result of the determination, the data is combined with the data remaining in the memory to form a recording unit. To generate additional data,
The generated additional data is added to the data remaining in the memory and recorded on the disk, and the address of the disk corresponding to the data remaining in the memory is recorded as the last address in the second recording area of the disk. ing. As a result, in the present application, only the portion where data is actually recorded is played back when the disc is played back, so the additional data portion is not played back, the additional data is played back erroneously, and abnormal noise is generated as a playback sound. There is no output from a playback device or the like.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an entire optical recording and / or reproducing apparatus to which the present invention is applied. In FIG. 1, a display 9 is provided on a front panel 1A of the optical recording and / or reproducing apparatus 1. The front panel 1A of the optical recording and / or reproducing apparatus 1 includes a power key 2, an OPEN / CLOSE key 3, a reproduction key 4, a pause key 5, a stop key 6, and an A key.
MS keys 7A and 7B and a recording key 10 are provided. 8
Is a disk tray, which is pulled out from an opening of the front panel 1A.

By operating the OPEN / CLOSE key 3, the disk tray 8 is pulled out of the apparatus 1 as shown by a dashed line. On this disc tray 8,
An optical disk (not shown) is placed. And OPE
When the N / CLOSE key 3 is operated again, the disc tray 8 is pulled into the apparatus 1. The optical disk is loaded into a recording and / or reproducing unit in the device 1.

The display 9 displays time information such as the total playing time of the loaded optical disc, the playing time of the music being played, the remaining playing time, and the track number of the playing music. In the case of an optical disc on which a disc name and a track name are recorded, the disc name and the track name are displayed on the display 9.

FIG. 2 is a block diagram showing a configuration of an optical disk recording and / or reproducing apparatus to which the present invention is applied.
Reference numeral 11 denotes a disk cartridge, in which an optical disk 11B having a diameter of 64 mm is stored in a cartridge 11A.
There are three types of optical discs 11B: a read-only optical disc, a recordable magneto-optical disc, and an optical disc having both a read-only area and a recordable area. Here, it is assumed that a magneto-optical disk is stored in the disk cartridge 11.

A pregroove wobbled in the radial direction of the disc is formed on the optical disc 11B based on the address data. In recording data on the optical disk 11B or reading the recorded data, it is performed based on address data obtained by detecting a pre-groove. Although the recording area of the optical disk 11B will be described in detail later, a first recording area in which data based on information such as general music signals is recorded and catalog information such as so-called TOC (Table Of Contents) are recorded. A second recording area. Recording data corresponding to a plurality of programs and a plurality of songs are recorded on the optical disk 11B along the pregroove.

Reference numeral 12 denotes a spindle motor,
1B is driven to rotate at a constant linear velocity. Spindle motor 1
2 is controlled by a servo control circuit 15 described later.

Reference numeral 13 denotes a magnetic head for generating an external magnetic field.
A vertical magnetic field modulated based on data to be recorded on the optical disk 11B is applied. An optical pickup 14 irradiates an optical disk with a light beam. The magnetic head 13 and the optical pickup 14 are arranged to face each other with the optical disk 11B interposed therebetween. The magnetic head 13 and the optical pickup 14 are connected by a connecting mechanism (not shown), and are integrally moved in the radial direction of the optical disk 11B.

Reference numeral 15 denotes a servo control circuit. The servo control circuit 15 generates an error signal such as a focusing error and a tracking error based on an output signal from the optical pickup 14 obtained via an RF amplifier 29 described later. A control signal for performing focusing servo and tracking servo is supplied to the optical pickup 14 based on the generated error signal.

Reference numeral 16 denotes a feed motor, which is an optical pickup 14.
In the radial direction of the optical disk 11B. The feed motor 16 performs a feed operation for a track jump to the optical pickup 14 based on a feed signal from the servo control circuit 15. Further, the feed motor 16 is supplied with a low frequency component of the tracking error signal supplied from the servo control circuit 15. When the optical pickup 14 is sent by the feed motor 16 in the radial direction of the optical disk 11B, the magnetic head 13 is also sent in the radial direction of the optical disk 11B.

A system controller 17 controls the operation of each component. This system controller 17
Is connected to a display 9 and an input key 18.
The input keys 18 correspond to the power key 2, the OPEN / CLOSE key 3, the reproduction key 4, the pause key 5, the stop key 6, the music selection keys 7A and 7B, and the recording key 10 of the front panel 1A shown in FIG. On the display 9, catalog information of the optical disk 11B, for example, total playing time, playing time of the currently playing song or program, time information such as remaining time, track number of the playing song or program, disc name, track name Are displayed.

Reference numeral 19 denotes a memory composed of a ROM (Read Only Memory). This memory 19 stores time information corresponding to the number of clusters and sectors as described later. The ROM 19 is connected to the system controller 17. The time information in the ROM 19 is read by data corresponding to the number of clusters and sectors determined by the system controller 17, that is, by address data.

Reference numeral 21 denotes an input terminal. An A / D converter 22 converts an analog audio signal input from the input terminal 21 into a 16-bit digital signal. The sampling frequency of the A / D converter 22 is 44.1 KHz.

Reference numeral 23 denotes an audio compression encoder / decoder. The first encoder / decoder 23 compresses the digital signal supplied from the A / D converter 22 to about 1/5. The first encoder / decoder 23 has a modified DC
Compression and decompression are performed using T (Modified Discrete Cosine Transform).

Reference numeral 24 denotes a memory controller.
The operation of writing data to the memory and the operation of reading data from the memory 25 are controlled. The memory controller 24 has a data generation circuit for generating dummy data, as described later.

A memory 25 has, for example, a storage capacity of 1M.
It is a bit dynamic RAM. In the memory 25,
When data is recorded on the optical disc 11B, data from the first encoder / decoder 23 is temporarily stored via the memory controller 24. During reproduction of the optical disk 11B, data from the second encoder / decoder 26 is temporarily stored in the memory 25 via the memory controller 24. The second encoder / decoder 26 performs an error correction process on the data read from the memory 25.
Further, the second encoder / decoder 26 performs EFM (8-14 modulation) on the data on which the error correction processing has been performed.
The error correction code is CIRC (Cross Interleave).
Reed Solomon Code) is used.

Reference numeral 27 denotes a drive circuit for the magnetic head 13,
The recording data from the encoder / decoder 26 is supplied. Reference numeral 28 denotes an address decoder, which decodes an address signal and an address signal recorded as the wobbled groove based on the reproduction signal supplied from the RF amplifier 29.

Reference numeral 30 denotes a D / A converter, which converts the digital signal expanded by the first encoder / decoder 23 into an analog audio signal. The analog audio signal is output from the output terminal 31.

In order to record data on the optical disk 11B, a recording level light beam is irradiated from the optical pickup 14 to heat the recording layer of the optical disk 11B, in this example, the magneto-optical recording layer. At the same time, a vertical magnetic field corresponding to the recording data is applied from the opposite surface of the optical disk 11B. The magneto-optical recording layer as the recording layer is magnetized along the direction of the vertical magnetic field when the temperature is reduced by the movement of the light beam.

As a result, data is recorded on the optical disk 11B. In order to read data from the optical disk 11B, a light beam having a lower power than during recording is applied to the optical disk 11B. This light beam is applied to the optical disk 11B.
Is reflected by the magneto-optical recording layer as the optical recording layer.
The reflected light beam is received by a pair of photodetectors of the optical pickup 14. The reproduction signal of the optical disk 11B can be obtained by taking the difference between the respective output signals from the pair of photodetectors.

The first encoder / decoder 23
If the data is obtained at 300 kbit / s, it is possible to release the compression and reproduce the uninterrupted sound.
On the other hand, as described above, the optical pickup 14
Reads a digital signal on the optical disk 11B at a transfer rate of 1.4 Mbit / sec. The 1-Mbit memory 25 is filled with digital signals in about 0.9 seconds. Even if the digital signals on the optical disk 11B cannot be read due to vibrations or the like, the memory 2 is stored for about 3 seconds.
5, the reproduction signal can be continuously output. In the meantime, by re-accessing the optical pickup 14 to the original position and reading the signal again,
The occurrence of so-called skipping can be prevented.

On the innermost circumference of the optical disk 11B, TOC (T
able Of Contents). In the TOC, information as to where and what data is recorded on the optical disk 11B is recorded. FIG. 3 shows the structure of the TOC. TOC includes a header area and a data area. The head of the header area is a fixed sync pattern area A1, followed by a header information area A2 indicating a cluster and a sector.

At the beginning of the data area, an area A3 of a fixed pattern is provided, in which an identifier indicating an optical disk, the type of the disk (reproduction-only, recordable, mixed reproduction-only and recordable area), recording power , An area A4 of identification information such as a start track number, a last track number, a lead-out start address, a used sector, a power calibration start address, a user TOC start address, and a recordable user area start address. Following this, the track number points (PT
Area A of NO1, P-TNO2, P-TNO3, ...)
5 are provided. This track number point (PT
NO1, P-TNO2, P-TNO3,...) Are pointers indicating the information addresses of the start address and end address of the track number. Following this, an area A6 for track information is provided. In the track information area A6, information on the start address and end address of each track is recorded. The address of the information of the start address and the end address of each track is indicated by a track number point (P-TNO1, P-TNO2, P-T
NO3,...).

Further, in the optical disk 11B, a user TOC is provided for managing recorded audio signals. FIG. 4 shows the structure of the user TOC.
The user TOC has the same basic structure as the above-mentioned TOC. The user TOC includes information on each track with a link.
-P (indicated by B1) is included. This Li
nk-P indicates which track follows. Therefore, it is not necessary to change the order of tracks to change the program or the order of music. All the management of the track information can be performed on the user TOC.

The TOC information is first accessed after the disk is mounted, read from the disk, and stored in a part of the memory 25. When updating the user TOC at the end of the recording operation on the disc, the user TOC is updated based on the data recorded on the memory 25 so far. For example, the updated user TOC before the disc cartridge is ejected is recorded in the lead-in area of the optical disc 11B. afterwards,
The disc cartridge is ejected from the recording and / or reproducing device.

The basic recording operation of the optical disk recording and / or reproducing apparatus thus configured will be described.

The analog audio signal input from the input terminal 21 is converted by the A / D converter 22 into a 16-bit digital signal. The digital signal converted by the A / D converter 22 is supplied to a first encoder / decoder 23. In the first encoder / decoder 23, the input digital signal is compressed into a data amount of about ５, for example, 4-bit digital data. The compressed digital data is temporarily stored in the memory 25 for each sector via the memory controller 24. The data stored in the memory 25 is read for each cluster. The digital data supplied to the second encoder / decoder 26 via the memory controller 24 is transmitted to the second encoder / decoder 26 by the second encoder / decoder 26.
FM modulation and an error correction code are added. The recording data output from the second encoder / decoder 26 is supplied to the magnetic head 13 via the head drive circuit 27.
At the same time as the perpendicular magnetic field modulated based on the recording data by the magnetic head 13 is applied to the optical disk 11B, the optical pickup 14 irradiates a light beam at the recording power level from the disk substrate side of the optical disk 11B.

At this time, if a track jump occurs, the system controller 17 performs the following control operation. First, from the optical pickup 14 to the optical disc 1
The power of the light beam applied to 1B is reduced to the reproduction level, and the driving of the magnetic head 13 is stopped. At the same time, the reading of data from the memory 25 stops. However, writing of data into the memory 25 is continued. The optical pickup 14 is returned to the position on the disk where the track jump occurred. Again, the power of the light beam emitted from the optical pickup 14 to the optical disk 11B is raised to the recording level, and at the same time, the reading of the data stored in the memory 25 is restarted to restart the recording operation. The detection as to whether or not a track jump has occurred is performed by, for example, the optical disk 11B decoded by the address decoder 28.
Is monitored by the system controller 17 as to whether or not the address information has become discontinuous.

The operation of reading data recorded on the optical disk 11B is performed as follows. The desired program number and music number are input by the input keys 18. This input data is supplied to the system controller 17. When the optical disk 11B is mounted on the recording and / or reproducing apparatus, the system controller 17
The optical pickup 14 is driven by driving the feed motor 16 based on the TOC information stored in a part of the optical disc 1.
1B in the radial direction.

When the optical pickup 11 reaches a position on the optical disk 11B where the specified program or music is recorded, reading of the optical disk 11B is started by the optical pickup 14. The reproduced data from the optical pickup 14 is supplied to the servo control circuit 15, the second encoder / decoder 26, and the address decoder 28 via the RF amplifier 29. In the address decoder 28, address information prerecorded from the optical disc 11B is extracted from the reproduced data and supplied to the system controller 17 via the second encoder / decoder 26. Servo control circuit 15
Then, servo signals such as a focusing servo signal and a tracking servo signal are generated and supplied to the optical pickup 14 and the spindle motor 12.

In the second encoder / decoder 26, decoding processing such as EMF demodulation of reproduced data and error correction processing is performed. The digital data from the second encoder / decoder 26 is temporarily stored in the memory 25 via the memory controller 24.

Data is read from the memory 25 in cluster units and supplied to the first encoder / decoder 23. In the first encoder / decoder 23, the data read from the memory 25 is expanded.
The digital signal output from the first encoder / decoder 23 is supplied to the D / A converter 30. The signal is converted into an analog audio signal by the D / A converter 30 and output from the output terminal 31.

The operation when a track jump occurs during the reproducing operation is basically the same as that at the time of recording. When it is detected that a track jump has occurred, the writing of data into the memory 25 is stopped, and the optical pickup 14 is moved to the point where the track jump has occurred. During that time, reading of data from the memory 25 is continued. When the optical pickup 14 returns to the point where the track jump has occurred, reading of the optical disk 11B is resumed, and writing of data to the memory 25 is resumed.

Next, in the embodiment of the present invention, the recording operation when the stop key 6 is operated during the recording operation, in other words, when the recording interruption is set, will be described with reference to FIGS. I do.

When the stop key 6 is operated during the recording operation of the recording and / or reproducing apparatus, it is rare that no data remains in the memory 25.
In many cases, data of less than one cluster remains in 5. Therefore, dummy data such as null data is generated from a data generator provided in the memory controller 24, and the dummy data is written in the memory 25. The data amount of the dummy data is such that the sum with the data remaining in the memory 25 forms one cluster. At this time, the inputs to the A / D converter 22 and the memory controller 23 are cut off based on the output from the system controller 17. Then, the data remaining in the memory 25 to which the dummy data has been added is read out from the memory 25 and recorded on the optical disk 11B.

That is, as shown in FIG. 5A, it is assumed that the stop key 6 is pressed at the point T0 before the data of the last cluster (N + 1) of the series of recording data is completed. At this time, as shown in FIG. 5B, dummy data is added to the data of the cluster (N + 1) remaining in the memory 25 to form data for one cluster. The data for one cluster thus formed is recorded on the optical disk 11B.

FIGS. 6 and 7 are flowcharts showing the processing at this time. As shown in FIG. 6, it is determined whether or not recording is in progress (step 51). If recording is in progress, the stop key 6 is pressed and it is determined whether or not a stop process is to be performed (step 52). In the case of the stop processing, 0 is added as dummy data to the data stored in the memory 25, and 1
Cluster data is formed (step 53). The data of the last cluster thus formed is recorded on the disk (step 54).

Whether or not data remains in the memory 25 when the recording is interrupted is determined by determining whether the difference between the pointer for writing data to the memory 25 and the pointer for reading data from the memory 25 is zero. Can be detected. This detection operation is performed by the memory controller 24 or the system controller 17.

That is, the data from the A / D converter 22 is taken into the memory 25 at a point designated by the write pointer in units of one sector. Then, data is read from the memory 25 in units of one cluster from the point designated by the read pointer. When recording is interrupted, the memory controller 24 determines whether or not data remains in the memory 25 based on whether or not the difference between the read pointer and the write pointer is 0, and supplies the determination result to the system controller 17, Generate.

When the recording of the data remaining in the memory 25 on the optical disk 11B is completed, the recording of the user TOC is performed. The final address of the current recording is the optical disk 11B corresponding to the last cluster or sector of the data remaining in the memory 25 when the recording was interrupted.
The above address information is taken into the memory area for creating the user TOC in the memory 25 as the end address of the program and the music and as the last address of the current recording operation. In other words, as described above, the memory 25
When the dummy data is added to the remaining data to form one cluster, the last cluster or sector is not used as the final address. Address. As a result, when the disk 11B is reproduced, only the part where data is actually recorded is reproduced, and the part of the dummy data is not reproduced. Therefore, the dummy data is not limited to null data, but may be anything.

At this time, the TOC is recorded on the optical disk 11B as shown in FIG. That is, it is determined whether or not recording is in progress (step 61). If recording is in progress, the stop key 6 is pressed, and it is determined whether or not to perform stop processing (step 62). If in stop processing, the stop key 6 is operated. Then, address information on the optical disk 11B corresponding to the last cluster or sector of the data remaining in the memory 25 at the time of writing is written in the TOC area of the optical disk 11B as the last address of the program or music.

As shown in FIG. 8A, if the stop key 6 is pressed at the point T0 before the data of the last cluster (N + 1) of the series of recording data is collected, the data of the cluster (N + 1) at this time is Save D1 until the next data to be recorded is entered.
As shown in FIG. 8B, a cluster (N + 1) may be formed from the data D2 and the stored data D1 and recorded.

In the embodiment of the present invention, the dummy data is generated by the data generation circuit provided in the memory controller 24. However, this data generation circuit may be provided in the system controller 17.

[0053]

According to the present invention, it is determined whether or not data remains in the memory when the recording operation is interrupted. If the data remains in the memory based on the determination result, the data remaining in the memory is determined. Together with the remaining data in the memory, add the generated additional data to the remaining data in the memory, record it on the disk, and change the address of the disk corresponding to the data remaining in the memory. The final address is recorded in the second recording area of the disc. As a result, in the present application, only the portion where data is actually recorded is played back when the disc is played back, so the additional data portion is not played back, the additional data is played back erroneously, and abnormal noise is generated as a playback sound. There is no output from a playback device or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 3 is a schematic diagram used for describing a TOC in one embodiment of the present invention.

FIG. 4 is a schematic diagram used for describing a TOC in one embodiment of the present invention.

FIG. 5 is a schematic diagram used for describing an embodiment of the present invention.

FIG. 6 is a flowchart used to explain an embodiment of the present invention.

FIG. 7 is a flowchart used to describe an embodiment of the present invention.

FIG. 8 is a schematic diagram used for describing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 optical disk recording / reproducing apparatus 11 disk cartridge 11B optical disk 17 system controller 23 audio compression encoder / decoder 25 memory

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/93 H04N 5/93 G (72) Inventor Nobuyuki Kihara 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation F term (reference) 5C052 AA03 AB09 CC11 FB01 FB08 5C053 FA23 GA11 HA33 KA01 KA19 KA25 5D044 AB06 BC06 CC06 DE12 DE29 EF03 EF05 GK12 GK19

Claims (2)

[Claims] An information signal which has been input is temporarily stored in a memory after being compressed, and the compressed information signal which is read out from the memory for each predetermined recording unit amount is subjected to signal processing, and then the first recording of the disk is performed. It is recorded in the area, and it is determined whether or not data remains in the memory when the recording operation is interrupted. If data remains in the memory based on the determination result, the data is combined with the data remaining in the memory. The additional data is generated so as to be the recording unit, the generated additional data is added to the data remaining in the memory, and the data is recorded on a disk, and the disk corresponding to the data remaining in the memory is recorded. A disc recording method for recording the last address as the last address in the second recording area of the disc. 2. The method according to claim 1, wherein the difference between the information indicating the data reading position of the memory and the information indicating the writing position to the memory is zero. 2. The disc recording method according to claim 1, wherein the discrimination is made.