JPH0660615A - Disc recorder - Google Patents

Abstract

PURPOSE:To allow data protection without requiring any non-volatile memory by temporarily writing TOC data, relevant to data already recorded, in an area other than a table on content(TOC) area at a predetermined timing prior to recording of TOC data in the TOC area. CONSTITUTION:Upon interruption of power supply or abnormal drop of power supply voltage during recording operation, TOC data relevant to already recorded data is missed if a non-volatile memory is not employed and thereby the TOC data can not be written in a TOC area. In order to avoid such inconvenience, TOC data is written in an empty area other than the TOC area on a disc. Consequently, power supply circuit 120 of disc recorder is connected with a voltage detecting circuit 123 and when power supply voltage of the circuit 120 drops below a predetermined level, output from the circuit 123 is delivered to a system controller 100 which supplies TOC data to a magnetic head 4 and records the TOC data in a predetermined area other than the TOC area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording device.

[0002]

2. Description of the Related Art The applicant of the present invention compresses audio data and intermittently records it on a small magneto-optical disk having a diameter smaller than a CD, for example, 64 mm, using a predetermined data amount as a recording unit. Proposed a disc recording / reproducing apparatus for reading compressed data from a disc intermittently, temporarily storing it in a buffer memory, reading the data from this memory as appropriate, and expanding the data to reproduce the original audio data. (For example, Japanese Patent Application No. 2
-221725). Since such a disc recording / reproducing apparatus has a small disc, the disc recording / reproducing apparatus can be downsized and a portable device can be realized.

In this type of disc recording / reproducing apparatus, in order to collectively manage the data recorded up to that point in a specific recording area of the disc, for example, a track position on the innermost circumference side of the disc, the recorded data is recorded. Information is recorded. Information regarding this recorded data is, for example, T
When the recorded data is audio data, it is called OC (Table of content), and includes the number of recorded songs, the recording position of each song, the playing time of each song, and an unrecorded area as information. Therefore, recording and reproduction are performed based on the TOC information of this disc, and at the time of reproduction, for example, a desired song can be immediately accessed using this TOC data.

This TOC data is gradually accumulated in the memory during recording, and when recording is completed or when the disc is ejected, the TOC data relating to the recorded data up to that point is recorded in the TOC area. The recording of the TOC data is performed after the recording is completed, because the TOC data regarding the content of the recorded data up to that point is fixed at the time of the recording completion.

[0005]

However, in the disk recording / reproducing apparatus, when the power supply voltage drops to such an extent that the apparatus cannot operate during the recording operation, the TOC data is not recorded on the disk. Subsequent recording will be virtually impossible, or playback by accessing the disc will be impossible. In the case of a commercial power supply type disk recording / reproducing apparatus, the abnormal decrease in power supply voltage as described above occurs due to a power failure during recording operation, abnormal voltage decrease, disconnection of a power plug from an AC outlet, or the like. In the case of a battery-driven device, this is caused by the battery life and so on.

In order to improve this drawback, a non-volatile memory is used as a memory for storing TOC data, and the TOC data is stored in the non-volatile memory after the power is restored.
A method of transferring to the TOC area of the disc can be considered.

However, when this method is adopted, T
When the OC data is relatively large, such as 2 Kbytes, there is a problem that a large-capacity memory must be used as the non-volatile memory that must be used, and an expensive memory must be used. .

An object of the present invention is to make it possible to protect TOC data without requiring the expensive non-volatile memory as described above.

[0009]

In order to solve the above-mentioned problems, the disk recording apparatus according to the present invention makes a predetermined specific recording area (for example, a normal recording area) on the disk correspond to the reference numerals of the embodiments described later. In a disc recording device for recording information (for example, TOC data) regarding recording data such as a recording position on the disc in the TOC area), the TOC data is recorded in the specific recording area. Previously, the TOC data up to that time is written in a predetermined area other than the specific recording area of the disc at a predetermined timing.

[0010]

In the present invention, as described above, TOC data is recorded in a predetermined area of the disc at any time. Therefore, for example, even if the power is turned off during recording, the TOC data regarding the recorded data immediately before that is already recorded on the disc, and the TOC data can be protected with a minimum damage.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the present invention in which audio data is compressed and recorded on a disc smaller than the above-mentioned CD.
This is an embodiment in the case of being applied to a disc recording / reproducing apparatus which expands data at the time of reproduction and reproduces original audio data.

In FIG. 1, reference numeral 1 is an optical disk. The outer diameter of the disk 1 of this example is, for example, 64 mm, and recording tracks are formed in a spiral shape on the disk 1 at a pitch of, for example, 1.6 μm. The disk 1 is rotationally driven by the spindle motor 3 and is controlled by the servo circuit 80 so as to rotate at a constant linear velocity, for example, 1.2 to 1.4 m / s. Then, on the disc 1, the audio information is converted into a digital signal, and the compressed information is recorded, so that the target information is, for example, 130 M.
More than one byte can be recorded and reproduced.

A pre-groove for optical spot control (tracking control) is formed in advance on the disc 1. Particularly, in the case of this example, the pre-groove is superposed on a wobbling signal for tracking. Then, the absolute address code indicating the position on the disc is recorded. The disc 1 is housed in a disc cartridge 2 to prevent dust and scratches.

[Recording System of Recording / Reproducing Apparatus] The embodiment of the recording / reproducing apparatus of FIG. 1 is devised so that the structure can be simplified as much as possible by using an IC. First, the time of recording on a magneto-optical disk will be described. It should be noted that, at the time of recording and at the time of reproduction, the mode of each circuit unit is switched by a mode switching signal from a system controller 100 configured by using a microcomputer. An operation key unit 110 is connected to the system controller 100. The operation key unit 110 includes a plurality of operation keys. When a predetermined key is input, an operation mode corresponding to the operation key is specified.

The left and right 2-channel stereo analog audio signals through the input terminal 6 are sampled at a sampling frequency of 44.1 kHz in the A / D converter 10.
Are sampled, and each sampled value is converted into a 16-bit digital signal. The 16-bit digital signal is supplied to the data compression / expansion processing circuit 20.
The data compression / expansion processing circuit 20 functions as a data compression circuit during recording and functions as a data expansion circuit during reproduction. This processing circuit 20 for data compression and decompression
Includes a buffer memory (not shown).

In the case of this example, the data compression / expansion processing circuit 20 compresses the input digital data to, for example, about 1/5. Various data compression methods can be used. For example, an ADPCM (Adaptive Delta Pulse Code Modulat) with a quantization number of 4 bits is used.
ion) can be used. In addition, for example, the input digital data is divided into a plurality of bands so that the higher the band is, the wider the band becomes, and a plurality of samples (the number of samples should be the same in each band) for each of the divided bands. It is also possible to use a method in which the blocks are formed, orthogonal transformation is performed for each block in each band, coefficient data is obtained, and bits are assigned to each block based on this coefficient data. The data compression method in this case considers the human auditory perception characteristics to sound, and can perform data compression with high efficiency (see Japanese Patent Application No. 1-278207).

In this way, the digital data DA from the A / D converter 10 is compressed to 1/5 by the data compression processing in the data compression / expansion processing circuit 20, and the data compressed data da is stored in the memory controller 30.
Is transferred to the buffer memory 31 controlled by. In the case of this example, the buffer memory 31 is a DRAM having a capacity of 1M to 4M bits.

If there is no track jump in which the recording position on the disk 1 jumps due to vibration or the like during recording, the memory controller 30 stores a predetermined amount of compressed data of a recording unit in the buffer memory 3 at intermittent recording timing.
The data is read from 1 at a transfer speed of about 5 times the writing speed, and the read compressed data is encoded into the data of the sector structure of the CD-ROM. One sector is about 2K bytes.
In this example, the audio data amount of the recording unit is 32
The memory controller 30 intermittently transfers the audio data of each recording unit to the data encoding / decoding circuit 40. The data including the audio data of 32 sectors will be referred to as a cluster hereinafter.

The memory controller 30 also performs memory control so that the amount of data accumulated in the buffer memory 31 is reduced as much as possible during normal operation during this recording. For example, when the amount of data in the buffer memory 31 exceeds a predetermined amount, the recording unit 3
Only data for two sectors is read from the buffer memory 31 and transferred to the circuit 40, and memory control is performed so that a write space of a predetermined data amount or more is always secured.

When it is detected that a track jump has occurred during recording, the memory controller 30 stops the data transfer to the circuit 40 and stores the compressed data from the circuit 20 in the buffer memory 31. Then, when the recording position is corrected to the correct track position, control is performed to restart the data transfer from the buffer memory 31 to the circuit 40.

Whether or not a track jump has occurred is detected by, for example, providing a vibrometer in the apparatus and detecting whether or not the magnitude of the tracking error causes a vibration detection output and a tracking error. It can be carried out. Further, as described above, since the absolute address code is recorded on the disc 1 of this example so as to be superposed on the wobbling signal for tracking control when forming the pre-groove, the absolute address from this pre-groove is recorded. It is also possible to read the code at the time of recording and detect the track jump from the decoded output. When a track jump occurs, the power of the laser light for magneto-optical recording is lowered so that past recorded data will not be erased.

The correction of the recording position when the track jump occurs can be performed using the absolute address code.

As will be understood from the above, the data capacity of the buffer memory 31 in this case is as follows.
It is necessary to have at least a capacity capable of accumulating compressed data corresponding to a time period from the occurrence of the track jump to the correct correction of the recording position. In this example, the buffer memory 31 has a capacity of 1M to 4M bits as described above, and this capacity is selected to have a margin to sufficiently satisfy the above conditions.

The data encode / decode circuit 40 includes
When recording, it functions as an encoding circuit and performs encoding processing for error detection and correction on data in cluster units, and also performs modulation processing suitable for recording, in this example EFM encoding processing. The code for error detection and correction is CIR in this example.
Although C (Cross-Interleaved Reed-Solomon code) is used, since the recorded data is intermittent data in cluster units, improved CIRC encoding processing is performed.

When this encoding process is performed, the data amount of the recording unit is one cluster plus several sectors for cluster connection (hereinafter referred to as linking sectors). The linking sector is for preventing the interleaving process of the CIRC encoding of the cluster unit data from affecting other cluster data.

That is, FIG. 2 is a diagram for explaining this recording data, and Ck, Ck + 1, Ck + 2, ... Show k, k + 1, k + 2th cluster data, respectively. That is, the recorded data is 32 sectors B0.
4 linking sectors L1 to L4 are respectively inserted between the clusters B1 to B31. In this case, one cluster, for example cluster Ck
2 is recorded, as shown in FIG. 2, 36 sectors are added by adding 3 sectors before the 32 sectors B0 to B31 of the cluster data Ck and 1 sector after the cluster data Ck. Record as a unit.

The linking sector added before the cluster data Ck is two sectors L for run-in block.
2, L3, and one sector L4 for sub data.
The sub-data sector L4 is currently an undefined area. Sector L1 after cluster data Ck
Are for run-out blocks. In this way, the recorded data is handled intermittently in units of 36 sectors.

In the data encoding / decoding circuit 40, the interleaving processing of the interleaving length of maximum 108 frames (corresponding to about 1.1 sectors) is performed on the data of one cluster. , Is within the range of the above-mentioned linking sectors L1 to L4 and does not affect the data of the clusters before and after that cluster. It should be noted that dummy data such as all 0s is allocated to the sectors L1 to L3.

The encoded data from the data encode / decode circuit 40 is supplied to the magnetic head 4 via the magnetic head drive circuit 50. The magnetic head drive circuit 50 drives the magnetic head 4 so as to apply a modulation magnetic field according to recording data to the magneto-optical disk 1. The print data supplied to the head is (1 cluster + 4
(Linking sector unit), and recording is performed intermittently as described above.

The disk 1 is housed in the cartridge 2, but when loaded in the apparatus, the shutter plate is opened and the disk 1 is exposed from the shutter opening. Then, the rotation shaft of the disk driving spindle motor 3 is inserted and connected to the spindle insertion opening, and the disk 1 is rotationally driven. In this case, the spindle motor 3 is controlled by the servo control circuit 80 to rotate the disk 1 at a linear velocity of 1.2 to 1.4 m / s.

The magnetic head 4 faces the disk 1 exposed from the shutter opening of the cartridge 2. An optical head 5 is provided at a position facing the surface of the disk 1 opposite to the surface facing the magnetic head. The optical head 5 is composed of, for example, a laser light source such as a laser diode, a collimator lens, an objective lens, an optical component such as a polarizing beam splitter, a cylindrical lens, and a photodetector. Laser light with a constant power, which is larger than the normal time, is emitted. Data is recorded on the disk 1 by thermomagnetic recording by this light irradiation and the modulation magnetic field by the magnetic head 4. And the magnetic head 4
The optical head 5 and the optical head 5 are both configured to be movable in the radial direction of the disk 1.

During this recording, the optical head 5
The output of the absolute address decoding circuit 7 via the RF circuit 60.
0, the absolute address code from the pre-groove of the disc 1 is extracted and decoded. Then, the decoded absolute address information is supplied to the data encoding / decoding circuit 40, inserted into the recording data as absolute address information, and recorded on the disc.
The absolute address information from the absolute address decoding circuit 70 is also supplied to the system controller 100, and is used for recognition of the recording position and position control as described above.

Further, a signal from the RF circuit 60 is supplied to the servo control circuit 80, a control signal for constant linear velocity servo of the motor 3 is formed from a signal from the pre-groove of the disk 1, and the motor 3 is speed controlled. To be done.

[Reproduction System of Recording / Reproducing Apparatus] The disk 1 loaded in the apparatus is rotationally driven by the spindle motor 3. Then, in the same way as when recording, this motor 3
The servo control circuit 80 controls the rotation speed of the disk 1 by the signal from the pre-groove so as to be constant at the same speed as during recording, that is, the linear speed of 1.2 to 1.4 m / s.

At the time of this reproduction, the optical head 5 detects the reflected light of the laser light applied to the target track,
For example, the focus error is detected by the astigmatism method, the tracking error is detected by the push-pull method, and the difference in the polarization angle (Kerr rotation angle) of the reflected light from the target track of the magneto-optical disk is detected. Detect the playback signal.

The reproduction of the reproduction data from the disk 1 by the optical head 5 is performed by a fixed amount under the control of the system controller 100, in this example, intermittently in cluster units.

The output of the optical head 5 is supplied to the RF circuit 60. The RF circuit 60 extracts a focus error signal or a tracking error signal from the output of the optical head 5 and supplies the focus error signal or the tracking error signal to the servo control circuit 80.
The value is converted and supplied to the data encoding / decoding circuit 40.

The servo control circuit 80 controls the focus of the optical system of the optical head 5 so that the focus error signal becomes zero, and the servo control circuit 80 controls the optical system of the optical head 5 so that the tracking error signal becomes zero. Performs tracking control.

The RF circuit 60 also extracts the absolute address code from the pre-probe and supplies it to the absolute address decoding circuit 70. Then, the absolute address information from the decoding circuit 70 is supplied to the system controller 100, and is used for the servo control circuit 80 to control the reproducing position of the optical head 5 in the disk radial direction. The system controller 100 can also use the address information in sector units extracted from the reproduction data to manage the position on the recording track scanned by the optical head 5.

During this reproduction, as will be described later, the disc 1
The compressed data read from is written in the buffer memory 31, read and expanded, but due to the difference in the transmission rate of both data, the timing of intermittent data reading by the optical head 5 from the disk 1 is For example, while being monitored by the memory controller 30 so that the amount of data stored in the buffer memory 31 does not fall below a predetermined amount, the system controller 100 controls the data.

The data encode / decode circuit 40 includes
During this reproduction, the RF circuit 6 works as a decoding circuit.
Upon receiving the binary reproduction signal from 0, processing corresponding to the encoding processing at the time of recording, that is, EFM decoding processing, decoding processing for error detection and correction, interpolation processing, and the like are performed. From this data encoding / decoding circuit 40,
The output data of the sector structure of the CD-ROM is decomposed by the memory controller 30 into data in which the sector structure is decomposed and compressed, then transferred to the buffer memory 31, and written at a predetermined writing speed.

At the time of this reproduction, the memory controller 30 writes the compressed data from the buffer memory 31 at the write speed unless the track jump in which the reproduction position jumps due to vibration or the like occurs during reproduction. The data is sequentially read at a transfer rate of about ⅕, and the read data is transferred to the data compression / expansion processing circuit 20.
In this case, as described above, the memory controller 30 determines that the amount of data stored in the buffer memory 31 is
The writing / reading of the buffer memory 31 is controlled so as not to fall below a predetermined level.

When it is detected that a track jump has occurred during reproduction, the system controller 100 causes the memory controller 30 to stop writing data from the circuit 40 to the buffer memory 31 and compress / decompress the data. Only data transfer to the processing circuit 20 is performed.
When the playback position is corrected, the buffer memory 3
The control for restarting the writing of data from the circuit 40 to 1 is performed.

As will be understood from the above, the data capacity of the buffer memory 31 at the time of reproduction corresponds to the time from the occurrence of the track jump to the correct correction of the reproduction position. The minimum capacity that can always store data is required. This is because with such a capacity, data can be continuously transferred from the buffer memory 31 to the data compression / expansion processing circuit 20 even if a track jump occurs. 1M to 4M bits as the capacity of the buffer memory 31 in this example is selected as a capacity having a margin so as to sufficiently satisfy the above condition.

As described above, the memory controller 30 controls the memory so that the buffer memory 31 stores as much predetermined data as the minimum required amount or more during normal operation. In this case, for example, when the amount of data in the buffer memory 31 becomes equal to or less than a predetermined amount, a data read request is issued to the system controller 100, and the optical head 5 intermittently takes in data from the disk 1. The data is written from the circuit 40, and the memory is controlled so as to always secure a read space of a predetermined data amount or more.

The data compression / decompression processing circuit 20 functions as a data decompression circuit at the time of reproduction, takes in the ADPCM data from the buffer memory 31 into the buffer memory (not shown), and reverses the data compression processing at the time of recording. It is processed and stretched about 5 times.

The digital audio data from the data compression / expansion processing circuit 20 is supplied to the D / A converter 11, converted into a 2-channel analog audio signal, and output from the output terminal 7. The digital audio data before D / A conversion can be output as it is.

In FIG. 1, 120 is a power supply circuit,
121 is an AC power plug. In the power supply circuit 120, the commercial AC power supply voltage is rectified into a predetermined DC voltage Vcc1, which is supplied to each unit such as the signal processing IC. The output of the power supply circuit 120 is the voltage holding circuit 12
2 is being supplied. The voltage holding circuit 122 has a predetermined time Tc even when there is a power failure, the AC plug 121 is accidentally unplugged to cut the voltage, or the power supply voltage drops abnormally.
The power supply voltage is maintained during the period. This voltage holding circuit 122
Can be composed of a capacitor or the like, and its output voltage Vc
The c2 is supplied to necessary parts in addition to the system controller 100.

The output of the power supply circuit 120 is supplied to the voltage detection circuit 123. This voltage detection circuit 123
Outputs the detection output DW to the system controller 100 when the power supply voltage Vcc1 becomes equal to or lower than a predetermined value. The system controller 100 uses this detection output DW
Accordingly, it is detected that the power supply is turned off or the power supply voltage has dropped to a value at which the device cannot operate even though the power supply on / off key of the operation key unit 110 is not operated.

[TOC data writing and protection] (1) Normal TOC data writing To a magneto-optical disk on which recording has not yet been performed, TO
C data is not recorded. Then, when recording is started, data relating to the recorded audio data, that is, the number of pieces of music, the recording position (absolute address) of each piece of music, etc. is stored in the memory area for TOC data of the buffer memory 31 or the memory built in the system controller 100. It is accumulated in sequence. After the recording is completed, when the eject key is operated on the operation key unit 110, for example, the system controller 1
00 is the optical head 5 before the eject operation is performed.
And the magnetic head 4 is moved to the innermost TOC area of the disk 1, and the data related to the recording data accumulated in the memory, that is, the TOC data is supplied to the magnetic head 4 via the circuit 40. The TOC data is recorded in the TOC area.

After the recording of the TOC data is completed, the system controller 100 supplies a control signal to the mechanical controller to execute the eject operation and take out the disc 1.

(2) Protection of TOC data As described above, when the power is cut off during the recording operation or the power supply voltage is abnormally lowered, the TOC data regarding the recorded data up to that point is Unless the memory in which is stored is backed up by a battery or is a non-flash memory, it will be lost and writing to the TOC area will not be possible.

Therefore, in this example, TOC data is written and protected in an empty area other than the TOC area of the disc.

(2) -1 Method of Using Recording Area of TOC Data and Recording Sub Data During Recording Operation As described above, in the format of the disk device of this example, the intermittent recording unit is 36 sectors. So 3
Sub-data of one sector is recorded before cluster data consisting of two sectors. As described above, this sub data is currently undefined. In this example, the recording area of this sub data is used to
Record C data.

In this example, several% of the sub data area on the disk 1, for example, one cluster sub data area for every 20 clusters is defined as a temporary TOC area for protection, and the temporary TOC area is defined. Then, the TOC data regarding the recording data up to that time is recorded together with the date and the time.

FIG. 3 shows an example of the data content of the sector of the sub-data which is the temporary TOC. In FIG. 3, 1 sector = 2352 bytes is arranged in the vertical direction × horizontal direction = 588 × 4 bytes (= 2352 bytes). When numbers are given in byte units in the horizontal direction from the upper left, for example, No. As the byte of 23, for example, [FF] (all 1) is recorded in hexadecimal notation as an identification data ID indicating that this sector is a sector of the temporary TOC area of the sub data sector.

No. 16-No. In 6 bytes of 21, the year (YY), month (MM), day (DD), hour (HH), minute (MM), and second (SS) at the time of recording are recorded. Then, as in the case of the normal TOC area, the No. The TOC data will be written in bytes after 28.

As described above, since the TOC data up to that time is written in the sub-data sector of 1 cluster for every 20 clusters, even if the power is cut off during recording, the power is cut off. Temporary TOC written before
The latest TOC data up to that time is written in the sub-data sector defined as. Therefore,
Even in the worst case, the TOC data relating to the recording data from the time of power-off to the recording time of 20 clusters (about 46 seconds before) is recorded on the disc 1 and protected.

As described above, the system controller 1
00, abnormal termination due to power failure during recording can be detected from the key operation input from the operation key unit 110 and the detection output DW of the voltage detection circuit 123. And
When the system controller 100 detects from the output of the voltage detection circuit 123 that the power supply has been turned on again after the abnormal end, first, the system controller 100 finds the last (newest) temporary area of the temporary TOC areas of the disk 1 and updates the latest temporary area. The data in the temporary TOC area is written in the original TOC area in the innermost circumference of the disc 1. Further, the system controller 100 ignores the operation input of the eject key of the operation key unit 110 so that the disc 1 cannot be ejected until the writing of the latest temporary TOC data to the original TOC area is completed. Work to do.

FIG. 4 shows a flowchart of the operation from the abnormal stop to the restart of the power supply. That is, the system controller 100 detects that the power supply voltage has risen from the output DW of the voltage detection circuit 123 (step 2).
01), it is determined whether or not the rise of the power source is the rise after the abnormal stop (step 202). As a result of this determination, if the power supply is normally started up, the system controller 100 has a key input or the like to perform a normal mode.

On the other hand, if it is determined in step 202 that the power supply has risen from an abnormal stop, the eject operation is prohibited (the operation input of the eject key is ignored) (step 203). Next, in step 204, the servo circuit 80 is controlled to search the sub data area in the recorded data of the disk 1 by the optical head 5, and the temporary TOC is performed.
When the sub data area as an area is detected, thereafter, a sub data area defined as a temporary TOC area every 20 clusters is searched and the temporary TOC data is read (step 204). Then, from the date and time information of this area, the last (latest) temporary T
The OC area is detected (step 205). When this latest temporary TOC data is detected, the temporary TO
The C data is written in the original TOC area of the inner circumference of the disk 1 (step 206). After that, the ejection prohibition is released (step 207) and the mode is shifted to the normal mode.

Method of using the calibration area in the U-TOC area The innermost U-TOC area of the disk 1 has 48 clusters. Of these, 2 clusters are data called a calibration area. It is defined as a writing area and is open to users. In this example, temporary TOC data is written in this calibration area.

In the case of writing the TOC data to the original TOC area, it is necessary to repeat the writing three times in order to complete the writing of the TOC data.
Therefore, although writing the TOC data to the original TOC area takes a relatively long time, this limitation is not imposed when writing the temporary TOC data to the calibration area, and the temporary TOC data is recorded. Since the data is updated in sequence, it only needs to be written once, and it does not take much time.

In the case of the disc recording / reproducing apparatus of this example, the data recording is intermittent and there is a free time during which no recording is performed. In this example, the free time is used to move the optical head 5 and the magnetic head 4 to the position of the calibration area in the TOC area, and the temporary TOC data similar to the example of FIG. 3 is written in the calibration area. .

The intermittent recording cycle is about 2.3 seconds in the case of the apparatus of this example, and it takes 0.48 seconds to record one cluster of data. Therefore, the free time is about 1.
8 seconds. The movement of the heads 4 and 5 to the calibration area and the writing of data are sufficiently possible within this free time.

Temporary T to this calibration area
The OC data may be written at constant time intervals as in the above example, but it is sufficient to write the OC data only at the end of recording one piece of data. As a result, the temporary TOC data for all the recorded songs are always written in the calibration area.

In the case of this example, when there is an abnormal stop due to a power failure or the like during the recording operation, the temporary TOC data up to the music recorded before the abnormal stop is recorded in the calibration area. ing.

Similar to the above-mentioned example, the system controller 100 transfers the TOC data from the calibration area to the original TOC area when the power is restarted after the abnormal stop.

FIG. 5 shows a flowchart of the operation from the abnormal stop to the power rising in this case.

(2) -2 Writing TOC data in designated empty area at abnormal stop In this example, temporary TOC data may be sequentially written in the empty area during the recording operation as in the above example. Instead, the output voltage Vcc2 of the voltage holding circuit 122 is used to write the TOC data (temporary TOC data) stored in the memory up to that time in an empty area at the time of abnormal stop.

Therefore, in the case of this example, the predetermined time for holding the voltage in the voltage holding circuit 122 is the length of time required for recording for TOC data protection due to voltage interruption or the like. Therefore, the scale of the voltage holding circuit 122 is
Although it is larger than in the case of the above example (2) -1, the time Tc is shorter than that in the case of writing in the original TOC area, so that it is smaller than in the case of writing in the original TOC area after power-off. It's done.

In the case of this example, as the designated free area to be used, (a) the sub-data area of the latest one cluster after the abnormal stop (b) an arbitrary recording area on the disc immediately after the abnormal stop is temporarily TOC Area and designated area (c) Calibration area Use one of the three areas.

When the designated areas (a) and (b) are used, the sector data recorded as temporary TOC data indicates that the sector is a temporary TOC sector, as shown in the example of FIG. Record identification data, date, time, etc. together with TOC data.

Also in the case of this example, when the power is turned on again after the abnormal stop, and before the shift to the normal mode,
In the cases of (a) and (b), the sector designated as the temporary TOC area is searched and found, the temporary TOC data of the temporary TOC area is transferred to the original TOC area, and (c) In the case of), the temporary TOC data is transcribed from the calibration area to the original TOC area.

Although the example described above is an example of recording data intermittently, temporary TOC data is recorded together with the recording data by utilizing an empty area in the recording data area like the sub data area. In the case of going forward,
The present invention can also be applied to a disk device that continuously records data.

As is apparent from the above, it goes without saying that the empty area in the recording data area is not limited to the sub data area. Similarly, areas other than the recording data area are not limited to the calibration area.

Further, the present invention is not limited to the disc recording device for recording audio data as shown in the example of the figure, but can be applied to a disc recording device in which information regarding recorded data is called a directory.

[0078]

As described above, according to the present invention, the information relating to the recording data is recorded in the empty area on the disc, so that the non-volatile memory for protecting this information is unnecessary. .

Then, when the information regarding the recording data is to be written in a predetermined empty area during recording,
Since it is not necessary to hold the power supply voltage even if there is an abnormal stop such as power failure, the power supply circuit block can be downsized and the cost increase can be prevented.

Further, in the present invention, when there is an abnormal stop such as power failure, the eject operation from the disk device is prohibited, and when the power supply voltage is restarted, first, a predetermined area of the disk is reached. Since the information about the record data protected by the above is written in the original recording area of the disc, the disc is always in a state where the information about the record data is correctly recorded.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a disk recording / reproducing apparatus including an embodiment of a disk recording apparatus according to the present invention.

FIG. 2 is a diagram for explaining print data in the example of FIG.

FIG. 3 is a diagram showing an example of temporary TOC data recorded according to the present invention.

FIG. 4 is a flow chart for explaining the operation of the embodiment of the present invention.

FIG. 5 is a flow chart for explaining the operation of another embodiment of the present invention.

[Explanation of symbols]

 1 magneto-optical disk 3 spindle motor 4 magnetic head 5 optical head 10 A / D converter 20 data compression / expansion circuit 30 memory controller 40 data encode / decode circuit 100 system controller 110 operation key unit 120 power supply circuit 122 voltage holding circuit 123 voltage detection circuit

Claims (7)

[Claims] 1. A disc recording apparatus for recording information on recording data such as a recording position on the disc in a predetermined specific recording area on the disc after the recording data is recorded. A disc recording apparatus configured to write information relating to the recording data up to that time in a predetermined area other than the specific recording area of the disc at a predetermined timing before the information is recorded. 2. A voltage detecting means for detecting that the power supply voltage has dropped to such an extent that the apparatus becomes unusable before the information regarding the print data is recorded in the specific recording area, and the power supply voltage is The disc recording apparatus according to claim 1, further comprising: a unit configured to, when restored, write the latest data of information regarding recording data recorded in an area other than the specific recording area to the specific recording area. 3. The ejecting operation from the device of the disk is disabled while the voltage detecting means detects that the power supply voltage has dropped to such an extent that the device cannot be used. The disk recording device according to claim 2. 4. A disc recording apparatus for recording information about a recording position of recording data on the disc in a predetermined specific recording area on the disc after the recording data is recorded. A voltage detecting means for detecting that the power supply voltage has dropped to the extent that the apparatus becomes unusable before the information on the recorded data is recorded; and a predetermined time from the time when the voltage detecting means detects the voltage drop. Means for holding a predetermined power supply voltage for a time, and means for writing information regarding the recording data up to that time in a designated area on the disk within a predetermined time when the predetermined power supply voltage is held Disk recording device including 5. The disc recording apparatus according to claim 1, wherein the information regarding the recording data is added and written in recording data of a predetermined unit. 6. The disc recording apparatus according to claim 1, wherein the information regarding the recording data is written in an empty area other than the specific recording area and the data recording area. 7. The specified area according to claim 4,
A disk recording device, which is an area immediately after it is detected by the voltage detection means that the power supply voltage has dropped to such an extent that the device cannot be used.