JPH0554518A - Optical disk recorder - Google Patents

Abstract

PURPOSE:To effectively utilize recording contents of an optical disk 2 by storing TOC information in a RAM when a main power source is dropped. CONSTITUTION:Bit compression digital data from an encoder 15 is magneto- optically recorded on a magneto-optical disk 2. The TOC information of recording contents is stored in a RAM 9. Whether a main power source voltage from a voltage stabilizer circuit 32, detected by a voltage detector 34 is below a prescribed threshold or not is checked by a system controller 8. At the time when the voltage is dropped, the TOC information of hitherto recording contents is stored in the RAM 9, and a power source is supplied from a backup battery 36 to this RAM 9. When the main power source is restored, the TOC information stored in the RAM 9 is recorded to the optical disk 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording apparatus for recording signals on a recordable optical disc such as a magneto-optical disc.

[0002]

2. Description of the Related Art The applicant of the present invention has previously disclosed a technique for bit-compressing an input digital audio signal and burst-recording a predetermined data amount as a recording unit, for example, Japanese Patent Application No. Hei 2-169977. , Japanese Patent Application No. 2-22136
4, Japanese Patent Application No. 2-221365, Japanese Patent Application No. 2-2228
No. 21, Japanese Patent Application No. 2-222823, each specification and drawings.

This technique uses a magneto-optical disk or the like as a recording medium and, for example, AD (adaptive difference) PCM audio data defined in audio data formats of so-called CD-I (CD-interactive) and CD-ROM XA, Alternatively, the digital audio data bit-compressed and encoded according to another format is recorded and reproduced. This bit-compressed digital audio data has a predetermined data amount as a recording unit,
For example, for every 32 sectors, a sector for linking (linking sector) is added to the front and the rear in consideration of interleaving with data of an adjacent sector, and the sectors are recorded continuously in a burst (intermittent) manner. ..

Here, for example, a so-called straight PC obtained by simply linearly quantizing data in a so-called standard CD (compact disc) format (CD-DA format) or an analog audio signal.
Consider a case where M audio data is bit-compressed to approximately 1/4 and recorded and reproduced. The reproduction time (play time) of the disc that is bit-compressed to approximately 1/4 and recorded is approximately four times as long as when the straight PCM data before compression, for example, the data in the CD-DA format is recorded. Become. This is a smaller disc, standard 1
Since the recording / reproducing time is the same as that of a 2 cm CD, the device can be downsized. In addition, the (instantaneous) bit rate of recording and reproduction is set to the standard CD-D.
By setting the same format as the A format, the time required for actual recording and reproduction can be reduced to about 1/4. Therefore, the remaining time of about 3/4 can be allocated to so-called retries. it can. Specifically, for example, at the time of recording data, it is a confirmation (verification) operation of whether or not the recording is normally performed, a rewriting operation when the recording is not normally performed, and the like, at the time of reproduction,
This is a re-reading operation or the like when the error rate of reproduced data is high. As a result, recording / reproduction can be performed more reliably even under adverse conditions in which the mechanism part vibrates and disturbances such as focus and tracking due to disturbance occur, and application to a small portable device becomes possible.

To record and reproduce such digital audio data bit-compressed to approximately 1/4,
A buffer memory for recording and / or reproducing compressed data is required. In this memory, compressed data is continuously written at a constant rate during recording, and is read out in bursts or intermittently at a speed of about 4 times. The data amount of one time at the time of this burst read is a predetermined data amount which is the recording unit, for example, 32 sectors, and as described above, several sectors for linking are added to the front and the rear of the disk spatially. It is recorded continuously (following the previous recording part). During reproduction, the data amount of the predetermined recording unit (for example, 32 sectors + several sectors for linking) is reproduced from the disc in a burst or intermittent manner at a speed approximately four times as high as the above, and before and after the linking. The sector is removed and written in the buffer memory. Compressed data is continuously read from the memory at the constant rate.

Here, when the total storage capacity of the buffer memory for recording and / or reproducing is M _T , the amount of data to which the compressed data has been written and not yet read (the amount of unread data), The sum of the remaining storage capacity (writable capacity) of the writable memory without destroying the unread data is M _T. Control of writing and reading with respect to such a memory will be described below.

At the time of recording, the compressed data is controlled to be written in the buffer memory at a constant data rate, and when the amount of unread data exceeds a predetermined amount M _K , a read rate faster than the written data rate is achieved. It is controlled so that it is read in bursts for each predetermined recording unit (for example, every 32 sectors + every several sectors) and recorded on a recording medium such as a disk. The data not yet recorded on this recording medium is the unread data on the memory. Here, when the recording operation on the recording medium is interrupted due to a disturbance such as vibration or the recording cannot be performed normally, the amount of unread data in the memory does not decrease and the amount of unread data in the memory does not decrease. When it is close to the total storage capacity M _T , the unread data may be destroyed by the compressed data written at a constant rate. With this in mind, by causing the recording to the recording medium at the stage below the writing capacity of the buffer memory a (M _T -M _K), i.e. provide a margin in the memory capacity of the writable area By doing so, it is possible to prevent the unread data from being destroyed when the recording on the medium is interrupted or cannot be normally performed. The (M _T -M _K), assuming the time required for restoration and re-recording or the like of the suspended state of the recording on the medium, may continue to operate for writing compressed data in the memory at the fixed data rate by this time period You can set it to some extent.

During reproduction, the compressed data read in burst from the recording medium is written in the memory and read out at a constant data rate. At this time, the amount of unread data in the memory is reduced. When it falls below a predetermined amount M _L , it is controlled so as to read from the recording medium in bursts and write to the memory. This is because even if data reading from a recording medium such as a disk cannot be normally performed due to disturbance or the like, the remaining unread data amount M _L
Can be continuously read, and the read operation at a constant rate is not interrupted and the reproduction is not interrupted. The unread data amount M _L may be set, for example, to such an extent that the operation of reading the compressed data from the memory can be continued at the constant rate for the time required to read the recorded data again on the recording medium.

[0009]

Generally, in an optical disk system, a so-called TOC (table of contents) data recording area is provided at a predetermined position such as the innermost circumference of the disk. This area (TOC area) TOC information such as the number of songs (the number of files), the absolute time when each song is recorded, the absolute time of an unrecorded area, and the like are recorded therein. Playback and recording are performed based on this TOC information. For example, during recording, the TOC information is stored in RAM.
It is temporarily stored in a (random access memory) or the like, and the TOC information in the RAM or the like is recorded in the predetermined TOC area of the disk after the recording is completed. That is, at the time of recording, the TOC information about the recorded contents is fixed at the time when the recording is completed, and this is recorded on the disc. During reproduction, the recording position is searched based on this TOC information and reproduction is performed.

However, when the power supply voltage drops during the recording by the optical disk recording device and the circuit does not operate normally, the TOC information is not recorded on the disk, and the recorded contents are reproduced. Will be virtually impossible. For example, in the commercial AC power supply drive type, a power failure or voltage drop may occur during recording, or the plug of the power cord may come off the outlet (outlet), and in the battery drive type,
It is possible that the battery runs out and the voltage drops rapidly. In such a case, it is impossible to reproduce all of the series of recorded contents from the start of recording to the point at which recording cannot be performed due to the voltage drop or power shutdown, etc. If a voltage drop occurs during the operation, the recorded contents of the entire disc cannot be reproduced unless a recording end (stop) operation is performed on the way.

The present invention has been made in view of the above circumstances, and has a simple structure, and the recorded contents up to that point are invalidated by the power supply voltage drop or interruption during recording as described above and reproduced. It is an object of the present invention to provide an optical disc recording apparatus capable of preventing the drawback that the above cannot be performed.

[0012]

An optical disk recording apparatus according to the present invention comprises a main power supply means for supplying a main power supply, a backup power supply means, and a voltage detection means for detecting the voltage of the main power supply means. , T of recorded contents
It has TOC information storage means for temporarily storing OC information and control means for controlling the operation of each part of the apparatus, and the voltage detection means detects that the output voltage of the main power supply means is lower than a predetermined threshold value. At this time, the above-mentioned problem is solved by supplying the power from the backup power supply means to at least the control means and the TOC information storage means.

[0013]

When the detection output of the main power supply voltage becomes lower than the threshold value, the power from the backup power supply means is supplied to at least the control means and the TOC information storage means. Even if it becomes impossible to carry out the above, the TOC information is held and the stored contents of the disc can be effectively used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block circuit diagram showing a schematic structure of an optical disk recording / reproducing apparatus as an embodiment of the optical disk recording apparatus according to the present invention. In FIG. 1, a bit compression digital audio signal is recorded on a recording medium such as an optical disk 2. This recording signal is burst read by the optical head 3 for each predetermined recording unit (for example, 32 sectors + several sectors), and bit-compressed audio data is obtained through the decoder 21 for descrambling and error correction decoding. This compressed data is written in a memory 22 such as a RAM (random access memory) and the memory 2
The audio signal is reproduced through the decoder 23 for reading out from the recording medium 2 at a constant data rate and restoring (decompressing) the bit compression processing on the recording side for decoding.

Here, the write operation control of the compressed data to the memory 22 is performed by reading the compressed data from the recording medium such as the optical disc 2 when the amount of data in the memory 22 becomes a certain amount or less. In the memory 22, the data is continuously read and written while there is a vacant area where data can be written in the memory 22, but when the vacant area becomes a certain value or less and writing becomes impossible, that is, a substantial memory full state. Then, reading from the recording medium is stopped and, for example, control is performed such that the optical head 3 continues tracing the same track position on the optical disc 2 or enters a standby state near the position to be read next.

On the optical disc 2, the number of music pieces (the number of data files), the absolute time when each music piece is recorded (absolute time), the absolute time of an unrecorded area, and so on are recorded together with the bit-compressed digital audio data. TO
The C information is recorded in the TOC area (or directory area) at a predetermined position such as the innermost circumference of the disc. The absolute time information in this case is, for example, address information indicating the start time and end time of a song when recording / reproducing in a standard CD format, and the time obtained by subtracting the start time from the end time is the audio data. Is the amount of data expressed by the standard playback time. For example, when the bit compression rate is 4, the actual reproduction (song play, so-called play) time is obtained by four times the standard reproduction time.

On a recordable optical disc 2 such as a magneto-optical disc, a pre-groove previously formed for tracking is wobbled (a slight vibration in the track width direction) at a predetermined frequency, and the absolute time ( A so-called ATI that records absolute time)
Although P (absolute time improve groove) is adopted, this ATIP signal is taken out by the ATIP detector 7 and sent to the system controller 8 having a CPU (central processing unit). The system controller 8 sends the ATIP information at the start and end of the music to the memory such as the RAM 9 to temporarily store the TOC information including the music number, the start time and the end time. When a stop operation or the like for ending recording (recording) is performed, the system controller 8 writes the TOC information stored in the RAM 9 in the TOC area on the optical disc 2 and then stops the recording operation. This optical disc 2
Based on the TOC information recorded in, the beginning of the desired song is searched (played) to play that song, or the beginning position of the unrecorded area is searched to record (record) the next new song. It can be done.

In this embodiment, the output from the battery 31 such as a dry battery or a rechargeable battery, or the direct current output obtained by rectifying and smoothing the commercial alternating current is supplied to the voltage stabilizing (voltage regulator) circuit 32 for the main power supply. It is sent, stabilized, and supplied to each circuit as the main Vcc ₁ power supply. The output from the battery 31 (or the rectified and smoothed output) is sent to the second voltage stabilizing circuit 33, and the output is supplied to at least the system controller 8 and the RAM 9 as the second Vcc ₂ power supply. The voltage of the main Vcc ₁ power supply from the voltage stabilizing circuit 31 is the voltage detector 3
4, the level is discriminated by a predetermined threshold value Vth, and the output is sent to the system controller 8. A backup battery 36 serving as a backup power supply is connected to the second Vcc ₂ power supply line via a diode 35. The threshold value Vth is set to, for example, a minimum voltage value for compensating an effective operation of the device or a voltage value slightly higher than this minimum voltage value. When the voltage of the main Vcc ₁ power supply falls below the threshold value Vth. A Vcc ₂ power source is supplied to the system controller 8 and the RAM 9 from the backup battery 36, which serves as a backup power source, via the diode 35.

More specifically, for example, a switch may be connected between the diode 35 and the Vcc ₂ power supply line, and this switch may be on / off controlled by the system controller 8. The main power supply voltage is the threshold value Vth
In the above case, the switch is turned off, and when it is below the threshold value Vth, the switch is turned on. When a large-capacity capacitor, a rechargeable battery, or the like is used as the backup battery 36, the Vcc ₂ power supply from the second voltage stabilizing circuit 33 is used as a system in a steady state (when the main power supply is normal). The system controller 8 supplies the controller 8 and the RAM 9 with the rechargeable backup battery 36 in a charged state, and when the main power supply goes down, the discharge current from the rechargeable backup battery 36 is supplied.
Alternatively, it may be supplied to the RAM 9 or the RAM 9.

When the detection output is sent from the voltage detector 34 to the system controller 8 when the main power supply voltage is lower than the threshold value Vth (when the main power supply is down), the system controller 8 sets the portion recorded up to that point to 1 The TOC information is stored in the RAM 9 as a song. Next, it waits for the main power supply voltage to rise, and when it rises, the TOC information stored in the RAM 9 is recorded on the disk 2.
As the RAM 9, it is preferable to use a low power consumption type memory such as a so-called CMOS memory. Further, it is necessary to provide a mechanism for prohibiting removal of the optical disk 2 from the device while the main power supply is down, or a structure for issuing a warning when attempting to remove the optical disk 2. Further, it is desirable to set the CPU of the system controller 8 and the like to a low current consumption mode such as a so-called standby mode while power is being supplied from the backup battery 36 when the main power supply is down.

With this configuration, even if the voltage of the battery 31 drops during recording, the TOC information of the recorded contents up to that point is stored and held in the RAM 9, and then the main power source is turned on. Since the TOC information is recorded on the optical disc 2 when it is recovered, the recorded contents up to immediately before the main power supply is turned off can be reproduced later. In the conventional case, when recording is interrupted midway, T
Since the OC information is not recorded on the disc, and the audio data in which the TOC information is not recorded cannot be reproduced because the head access for reproduction cannot be performed, there is a disadvantage that the user is equivalent to not recording. However, according to the embodiment of the present invention, the TOC information up to immediately before the recording is interrupted by the power-down is saved, so that all the recorded contents up to that point can be reproduced.

The specific structure and operation of FIG. 1 will be described in detail below. As the optical disk 2 that is driven to rotate by the spindle motor 1, for example, a recordable magneto-optical disk is used. However, in the case of reproduction only, an aluminum reflection film type optical disk similar to a normal CD (compact disk) can be used. This optical disk (eg magneto-optical disk) 2
The optical head 3 for performing recording and / or reproducing with respect to, for example, has a laser light source such as a laser diode, optical components such as a collimator lens, an objective lens, a polarization beam splitter, and a cylindrical lens, and a light receiving portion of a predetermined pattern. It is composed of a photo detector and the like.
The optical head 3 is provided at a position facing the magnetic head 4 with the magneto-optical disk 2 interposed therebetween. When recording data on the magneto-optical disk 2, a magnetic head 4 is driven by a head driving circuit 16 of a recording system to be described later to apply a modulation magnetic field according to the recording data, and the optical head 3 serves the purpose of the magneto-optical disk 2. Thermomagnetic recording is performed by a magnetic field modulation method by irradiating the track with laser light. The optical head 3 also detects the reflected light of the laser light applied to the target track, detects a focus error by, for example, a so-called astigmatism method, and detects a tracking error by, for example, a so-called push-pull method. When reproducing data from the magneto-optical disk 2, the optical head 3 detects the focus error and the tracking error, and at the same time, detects the difference in the polarization angle (Kerr rotation angle) of the reflected light from the target track of the laser light and reproduces it. Generate a signal.

The output of the optical head 3 is the RF amplifier circuit 5
Is supplied to. The RF amplifier circuit 5 is used in the optical head 3
The focus error signal and the tracking error signal are extracted from the output of the above and supplied to the servo control circuit 6, and the reproduction signal is binarized to reproduce the decoder 2 described later.
Supply to 1. Further, the RF amplifier circuit 5 is the same as the ATI
The P (absolute time improve) signal is taken out and sent to the ATIP detection circuit 7.

The servo control circuit 6 is composed of, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, a sled servo control circuit, and the like. The focus servo control circuit controls the focus of the optical system of the optical head 3 so that the focus error signal becomes zero. The tracking servo control circuit controls the tracking of the optical system of the optical head 3 so that the tracking error signal becomes zero. Further, the spindle motor servo control circuit controls the spindle motor 1 so as to drive the magneto-optical disk 2 to rotate at a predetermined rotation speed (for example, a constant linear speed). Further, the sled servo control circuit moves the optical head 3 and the magnetic head 4 to the target track position of the magneto-optical disk 2 designated by the system controller 8. The servo control circuit 6 performing such various control operations supplies the system controller 8 with information indicating the operating state of each part controlled by the servo control circuit 6.

A key input operation section 38 and a display section 39 are connected to the system controller 8. The system controller 8 controls the recording system and the reproducing system in the operation mode designated by the operation input information from the key input operation unit 38. Further, the system controller 8 uses the ATIP signal reproduced from the magneto-optical disk 2 and the address information (time information) in sector units based on the header time in the reproduced data, the Q data of the subcode, etc. Also, the recording position and the reproducing position on the recording track traced by the magnetic head 4 are managed. Display 3
The information of the recording position or the reproducing position, the information of the function selected by the key operation, and the like are displayed at 9 as required.

Next, the recording system of this disc recording / reproducing apparatus will be described. The analog audio input signal A _IN from the input terminal 10 passes through the low-pass filter 11 and is A / D.
It is supplied to the converter 12. The A / D converter 12 quantizes the analog audio input signal A _IN , and the obtained digital audio signal is, for example, AD (adaptive difference).
It is supplied to the encoder 13 for high efficiency encoding processing such as PCM. Further, a digital audio signal from the outside may be supplied to the encoder 13 via a digital input interface circuit (not shown). The digital audio PCM signal input to the encoder 13 is so-called straight PCM data that is not subjected to compression processing, and as a specific example, a standard CD (compact disc) format (CD
-DA format), PCM with a sampling frequency of 44.1 kHz and a quantization bit number of 16 bits
Data. The encoder 13 performs high-efficiency bit compression processing on the input audio PCM data so that the bit rate is, for example, about 1/4.

Next, in the memory 14, the writing and reading of data are controlled by the system controller 8, the bit compressed data supplied from the encoder 13 is temporarily stored, and is recorded on the disk as needed. It is used as a buffer memory of. That is, for example, in the 1/4 bit compression mode, compressed data of a constant bit rate reduced to about 1/4 of the data transfer rate (bit rate) of the standard CD-DA format is continuously stored in the memory 14. Will be written. When this compressed data is recorded on the magneto-optical disc 2, it is recorded in a burst or discrete manner at the same data transfer rate under the same disc rotation speed (constant linear velocity) as the standard CD-DA format. There is. That is, the time during which the signal is actually recorded in the recording mode is about 1
/ 4, and the remaining 3/4 time is a rest period in which no recording is performed. However, on the magneto-optical disk 2, the next recording is performed following the area recorded immediately before the pause period, and continuous recording is performed on the medium surface. As a result, for example, the same recording density and recording pattern as in the standard CD-DA format are recorded.

Therefore, the compressed data is burst-read from the memory 14 at a bit rate corresponding to the data transfer rate of the standard CD-DA format.
The read compressed data is supplied to the encoder 15 for performing interleave processing, error correction coding processing, EFM modulation processing, and the like. Here, in the data string supplied from the memory 14 to the encoder 15, one cluster consisting of a predetermined plurality of sectors (for example, 32 sectors) is a unit to be continuously recorded in one recording, and when this is subjected to encoding processing. , The data amount obtained by adding several sectors for cluster connection to the data amount of one cluster. The sector for cluster connection is set longer than the interleave length in the encoder 15 so that the data of other clusters will not be affected even if interleaved. Details of this cluster unit recording will be described later with reference to FIG.

The encoder 15 uses the recording data supplied in burst from the memory 14 as described above.
Encoding processing (parity addition and interleave processing) for error correction, EFM encoding processing, and the like are performed. The recording data encoded by the encoder 15 is supplied to the magnetic head drive circuit 16. The magnetic head drive circuit 16 is connected to the magnetic head 4,
The magnetic head 4 is driven so as to apply the modulation magnetic field according to the recording data to the magneto-optical disk 2.

The system controller 8 controls the memory 14 as described above, and continuously records the recording data read in burst from the memory 14 on the recording track of the magneto-optical disk 2 by this memory control. The recording position is controlled as described above. The recording position is controlled by controlling the recording position of the recording data which is burst-read from the memory 14 by the system controller 8 and outputting a control signal for designating the recording position on the recording track of the magneto-optical disk 2 to the servo control circuit. 6
It is done by supplying to.

Next, the reproducing system of this disc recording / reproducing apparatus will be described. This reproducing system is for reproducing the recording data continuously recorded on the recording track of the magneto-optical disk 2 by the above-mentioned recording system, and the recording track of the magneto-optical disk 2 is laser-lighted by the optical head 3. The recording signal is read from the magneto-optical disk 2 by tracing with. Here, the magneto-optical disk 2 is rotationally driven at the same rotation speed (constant linear velocity) as the standard CD-DA format, and is bursty (discrete) at the same data transfer rate as the CD-DA format. Then, the recording signal is read, binarized by the RF amplifier circuit 5, and supplied to the decoder 21.

The decoder 21 corresponds to the encoder 15 in the recording system described above, and performs deinterleaving processing, decoding processing for error correction, and EFM on the reproduced output binarized by the RF amplifier circuit 5. Processing such as demodulation processing is performed, and the above-described 1/4 compressed data is output in bursts at the same data transfer rate as that of the standard CD-DA format. The reproduction data obtained by the decoder 21 is supplied to the memory 22.

In the memory 22, writing and reading of data are controlled by the system controller 8, and reproduced data which is supplied in burst from the decoder 21 at the same data transfer rate as the standard CD-DA format is written. Further, the reproduction data written in bursts is continuously read out from the memory 22 at a constant bit rate, that is, at a data transfer rate of about 1/4 of the standard CD-DA format.

The system controller 8 performs memory control for writing / reading the reproduction data to / from the memory 22, and the reproduction data written in a burst from the memory 22 by the memory control is stored in the magneto-optical disk 2. The playback position is controlled so as to continuously play back from the recording track. The reproduction position is controlled by controlling the reproduction position of the reproduction data which is burst-read from the memory 22 by the system controller 8 and transmitting a control signal for designating the reproduction position on the recording track of the magneto-optical disk 2 to the servo control circuit. It is carried out by supplying to No. 6.

Compressed data obtained as reproduced data continuously read from the memory 22 at a transfer rate (bit rate) of about 1/4 of the standard is supplied to the decoder 23. This decoder 23 corresponds to the encoder 13 of the recording system, and, for example, expands the compressed data of 1/4 by 4 times (bit expands) to 1
Play 6-bit digital audio data. The digital audio data from this decoder 23 is
It is supplied to the D / A converter 24.

The D / A converter 24 converts the digital audio data supplied from the decoder 23 into an analog signal, and outputs the analog audio output signal A _OUT from the output terminal 26 via the low pass filter 25.

Next, a battery (battery) 31 such as a dry battery or a rechargeable battery, or a DC power supply obtained by rectifying and smoothing commercial AC is used, and this power supply voltage is stabilized by a voltage (voltage regulator) circuit 32. It is stabilized by and is supplied to each part as the main Vcc ₁ power supply. Further, the output from the battery 31 (or rectification smoothing output or the like) is sent to the second voltage stabilizing circuit 33, and the output is supplied to the system controller 8 and the RAM 9 as the second Vcc ₂ power supply. The voltage of the main Vcc ₁ power supply from the voltage stabilizing circuit 31 is detected by the voltage detector 34, the level is discriminated by a predetermined threshold Vth, and the output is sent to the system controller 8. The input of the voltage detector 34 may be connected to a power supply terminal such as the battery 31 and the power supply voltage may be monitored. A backup battery 36 serving as a backup power supply is connected to the second Vcc ₂ power supply line via a diode 35.
When the main power supply voltage falls below the threshold value Vth,
The detection output from the voltage detector 34 is the system controller 8
At this time, the system controller 8 treats the part recorded on the magneto-optical disk 2 as one piece until the TOC.
Information is generated and the TOC information is stored in the RAM 9. A low power consumption memory such as a CMOS is used for the RAM 9 and holds the TOC information until the main power supply voltage is restored by receiving power supply from the backup battery 36. When the main power is restored, the system controller 8 records the TOC information stored in the RAM 9 on the magneto-optical disk 2.

By the way, it is desirable that the magneto-optical disk 2 used in such a disk recording / reproducing apparatus has a capacity capable of recording a stereo audio signal for 60 minutes to 74 minutes or more. For example, the data compression rate is 1/4. When using, about 130 Mbytes or more is required. In order to construct a portable or pocket-sized recording and / or reproducing apparatus, the outer diameter of the disk is 8c.
It is desirable to use discs of m or smaller diameter. Further, regarding the track pitch and the linear velocity, the same track pitch as the CD, 1.6 μm, and the linear velocity 1.
It is desired to be 2 to 1.4 m / s. A disc satisfying these conditions has, for example, a disc outer diameter of 6
4 mm, the outer diameter of the data recording area is 61 mm, the inner diameter of the data recording area is 31 mm, and a lead-in area having a width of 1.5 mm is formed inside this. A lead-out area having a width of 0.5 mm is formed outside the outer diameter of the data recording area. If this disc is housed in a disc caddy having a length and width of 70 mm × 74 mm and supplied to the market, recording / reproducing can be performed on the disc by a recording / reproducing device of a pocket size. In addition, 7 in the above 1/4 data compression mode
The range of the inner diameter and outer diameter of the data recording area of the disc for enabling the recording and reproducing for 2 to 76 minutes or more is from the outer diameter of 58 mm to 62 mm when the inner diameter is 28 mm to the inner diameter of 50 mm. The outer diameter may be appropriately set within the range of 71 mm to 73 mm.

Next, the basic recording / reproducing operation of the disk recording / reproducing apparatus as described above will be described in more detail. First, the recording data (data read from the memory 14) is clustered for every fixed number (for example, 32) of sectors (or blocks), and some sectors for cluster connection are provided between these clusters. It has been arranged. Specifically, as shown in FIG.
A cluster C is composed of 32 sectors (blocks) B0 to B31, and four connecting (linking) sectors L1 to L4 are arranged between these clusters C and are connected to the adjacent cluster. There is. Here, in the case of recording one cluster, for example, the kth cluster C _k , not only the 32 sectors B0 to B31 of this cluster C _k but also 3 sectors in the front and 1 sector in the rear are connected sectors. That is, two sectors L2 and L3 for run-in blocks and one sector L4 for sub-data on the cluster C _k-1 side, and one sector for run-out blocks on the cluster C _{k + 1} side. Sector L1
Recording is performed in units of 36 sectors, including and. At this time, the recording data for these 36 sectors is sent from the memory 14 to the encoder 15, and the interleaving process is performed by the encoder 15, so that the distances of up to 108 frames (corresponding to about 1.1 sectors) are rearranged. However, the data in the cluster C _k is well within the range of the sectors L1 to L4 for linking, and the other clusters C _k-1 and C _{k + 1.}
Does not affect Note that the dummy data such as 0 is arranged in the sectors L1 to L3, and the auxiliary sub-data is arranged in the sector L4, so that the adverse effect on the original data due to the interleave processing can be avoided. here,
In the main data sectors B0 to B31, 8-bit binary numbers (two-digit hexadecimal numbers) are 0000 0000 (00H) to 0001 11
The sector numbers of 11 (1FH) are assigned, the sector L1 of the linking portion is assigned 0010 0000 (20H), and the sectors of L2 to L4 are assigned 0011 1101 (3DH) to 00111111 (3FH). Further, as the cluster, for example, 36 sectors including the linking sector may be one cluster.

By performing such recording in cluster units, it is not necessary to consider mutual interference due to interleaving with other clusters, and data processing is greatly simplified. Also, if recording data could not be recorded normally during recording due to defocusing, tracking deviation, or other malfunctions, re-recording could be performed in cluster units above, and if effective data reading could not be performed during playback. Re-reading can be done in cluster units.

By the way, one sector (block) has 235
It consists of 2 bytes, 12 bytes for synchronization from the beginning, 4 bytes for header, and data D0001 to D2336 23
36 bytes are arranged in this order. Of the 12 bytes for synchronization in the sector structure (block structure), the first 1 byte is 00H (H indicates a hexadecimal number), 10 bytes of FFH are continued, and the last 1 byte is 00H. The next 4-byte header consists of one byte each for minutes, seconds, and the address portion of the block, followed by one byte for mode information. This mode information is mainly for indicating the mode of the CD-ROM, and the internal structure of the sector shown in FIG. 2 corresponds to the mode 2 of the CD-ROM format. CD-I is a standard using this mode 2.

The specific example of FIG. 2 further shows a format for recording compressed audio data. From the beginning of the 2336-byte area, an 8-byte sub-header, each of 128 bytes, has 18 sound groups SG01 to SG01. The SG 18, a 20-byte space area, and a 4-byte reserve area are arranged in this order. 8 above
The byte sub-header is formed by repeating a file number, a channel number, a sub mode, and a data type of 1 byte each twice.

By the way, when data having such a sector structure is recorded on the disk, encoding processing including parity addition and interleaving processing is performed by the encoder 15, and EFM (8-14 modulation) processing is performed. Given, fig. 3
Recording is performed in the recording format as shown in.

In FIG. 3, one block (one sector) consists of 98 frames from the first frame to the 98th frame, and one frame is a channel clock cycle T.
588 times (588T) of the frame synchronization pattern part of 24T (+ 3T connection bit) in one frame, 14T
A (+ connection bit 3T) subcode portion and a 544T data (audio data and parity data) portion are provided. The data portion of 544T is 12 bytes (12 symbols) of audio data, 4 bytes of parity data, 12 bytes of audio data, and 4 bytes of parity data that are so-called EFM modulated. Is 24 bytes (ie 1 word of audio sample data is 16
Since it is a bit, it is 12 words). The sub-code portion is EFM-modulated 8-bit sub-code data, and is divided into blocks of 98 frames, and each bit constitutes eight sub-code channels P to W. However, the subcode portions of the first and second frames have block synchronization patterns S _{0 and} S ₁ out of the EFM modulation rule (out-of-rule), and the subcode channels P to W are from the third frame to the third frame. There are 96 bits each for up to 98 frames.

The above audio data is recorded by being interleaved, but at the time of reproduction, it is deinterleaved to be audio data having a data array in the order of time. Instead of this audio data,
It is possible to record general CD-I data and the like.

In the disc recording / reproducing apparatus of FIG. 1, the system controller 8 continuously increments the write pointer W of the memory 14 at a speed corresponding to the bit rate of the compressed data, as shown in FIG. When the unread data amount of the compressed data stored in the memory 14 exceeds a predetermined amount M _K , the read pointer R of the memory 14 conforms to the standard CD-DA format. Memory control is performed so that the data is incremented in bursts at the transfer rate and read out in predetermined recording units (for example, 32 sectors). Therefore, in the memory 14, the amount of data that can be written without destroying the unread data, that is, the recordable capacity is
It will be prevented from falling below a predetermined amount (M _T −M _K ).

Here, the recording data read out from the memory 14 in a burst is continuous on the recording track of the magneto-optical disk 2 by controlling the recording position on the recording track of the magneto-optical disk 2 by the system controller 8. Can be recorded in the state. Moreover, as described above, since the memory 14 is always secured with a data writing area of a predetermined amount or more, the system controller 8 detects that a track jump or the like has occurred due to disturbance or the like, and the recording operation to the magneto-optical disk 2 is performed. Even when interrupted, the input data can be continuously written in the recordable area of the predetermined amount or more, and the recovery processing operation can be performed during that time, and the input data is continuously recorded on the recording track of the magneto-optical disk 2. Can be recorded in the state.

On the magneto-optical disk 2, header time data or the like corresponding to the physical address of the sector is added to the compressed digital audio data for each sector and recorded. Further, the catalog data indicating the recording area and the recording mode are recorded in the catalog area such as the TOC area.

Next, in the reproducing system in the disc recording / reproducing apparatus of FIG. 1, the system controller 8 sets the write pointer W of the memory 22 to a standard CD as shown in FIG.
While incrementing at a transfer rate according to the DA format and writing in bursts, the read pointer R of the memory 22 is continuously incremented and read at a rate corresponding to the bit rate of the compressed data, and the write pointer W is Writing is stopped when the read pointer R is caught up (the writable area becomes 0), and writing is performed when the unread data amount stored in the memory 22 becomes a predetermined amount M _L or less. Performs memory control. Therefore, it is possible to continuously read the reproduced data from the memory 22 while always ensuring the data read area of the unread data amount of the predetermined amount M _L or more in the memory 22.

The reproduction data written in a burst in the memory 22 is reproduced in a continuous state on the recording track of the magneto-optical disk 2 by controlling the reproduction position on the recording track of the magneto-optical disk 2 by the system controller 8. can do. Moreover, as described above, since the memory 22 is always secured with the data reading area of the predetermined amount M _L or more, the system controller 8 detects that a track jump or the like has occurred due to disturbance or the like, and the magneto-optical disk 2 is read. Even if you interrupt the playback operation,
The reproduced data can be read from the data read area of the predetermined amount M _L or more to continue the output of the analog audio signal, and the restoration processing operation can be performed during that time.

Next, by the system controller 8 and the voltage detector 34, when the main power supply voltage drops, the TOC
The operation of automatically storing information in the RAM 9 will be described with reference to FIG.

Recording (sound recording) in step S1 of FIG.
Is started, the system controller 8 proceeds to step S2 to check the main power supply voltage detection output from the voltage detector 34. When it is determined in this step S2 that it is OK (the main power supply voltage has not dropped), the process proceeds to the next step S3, and a music number change check is performed. This song number change check is 1
When the song ends, it is determined that the song number is changed (for example, incremented by 1) in order to record (record) the next song, and when YES (the song is finished) is determined, the step is performed. After proceeding to S4 to store (store) information such as the ending time of the song in the RAM 9, the process proceeds to S5. When NO is determined in step S3 (the tune has not ended), the process directly proceeds to step S5. In step S5, it is determined whether or not the stop (STOP) button has been operated. If it is determined to be OFF (not operated), the process returns to step S2 to check the power supply voltage. When it is determined in step S5 that it is ON (the stop button has been operated), the process proceeds to step S6 and shifts to the recording end mode. At this time, in the next step S7, the present absolute time is stored as the ending time in the RAM 9 as music information, and in the next step S8, this R is stored.
After recording all the TOC information stored in the AM 9 on the magneto-optical disk 2, the recording operation is stopped.

Next, when it is judged as NG (the main power supply voltage has decreased) in the above step S2, step S
The process proceeds to step 11 to end the recording on the disc, and in the next step S12, the music information (TOC information) whose recorded content is one music is stored in the RAM 9. In the next step S13, the system controller 8 checks the main power supply voltage detection output from the voltage detector 34, and when it is NG (main power supply down state), returns to step S13 and is OK (main power supply recovery).
If so, the process proceeds to step S8, and after the TOC information stored in the RAM 9 is recorded on the magneto-optical disk 2,
Stop the recording operation.

While the main power supply is down,
It is necessary to provide a mechanism for prohibiting removal of the optical disk 2 from the device, or a structure for issuing a warning when the optical disk 2 is attempted to be removed. Further, while the power is being supplied from the backup battery 36 when the main power supply is down, it is desirable that the CPU of the system controller 8 and the like be in a low current consumption mode such as a so-called standby mode.

According to the above operation, when the voltage of the main power supply is determined to be NG (lower than the predetermined threshold voltage), the TOC information including the music information up to that time is forced to the RAM 9. Memory, and when the main power is restored next time, the T
Since the OC information is recorded, even if recording cannot be performed due to a power supply voltage drop due to a power outage or battery life, etc., the stored contents up to where the TOC information is recorded can be effectively used and reproduced. It becomes possible.

The present invention is not limited to the above-described embodiment, and the present invention can be applied not only to a recording / reproducing apparatus for an optical disk but also to a recording-only apparatus. Also,
A switch is inserted and connected between the backup battery 36 and the second Vcc ₂ power supply line to connect the system controller 8
Therefore, the switch may be turned on only when the main power source is down. The voltage detector 34 is the battery 31.
It may be configured to detect the side DC power supply voltage. Furthermore, a rechargeable battery, a large-capacity capacitor, or the like is used as the backup battery 36, and is charged by the power supply current from the voltage stabilizing circuit 33 when the main power supply is normal,
The charged electric charge may be discharged to back up when the main power source is down.

[0057]

As is apparent from the above description, according to the optical disk recording apparatus of the present invention, the main power supply means and the backup power supply means are provided, and the voltage of the main power supply means has a predetermined threshold value. When it is detected that the TOC information is low, the power from the backup power supply means is supplied to at least the TOC information storage means. Then, when the main power is restored next time, the TOC information is recorded on the disc, so that the stored contents of the disc can be effectively used, and for example, the recorded contents can be reproduced.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration example of a disc recording / reproducing device as one embodiment of an optical disc recording device according to the present invention.

FIG. 2 is a diagram showing a format of a cluster structure which is a recording unit on a recording medium.

FIG. 3 is a diagram showing formats of frames and sectors (blocks) in the so-called CD (Compact Disc) standard.

FIG. 4 is a diagram showing a memory-controlled state of a memory in the recording system of the disc recording / reproducing apparatus of the embodiment.

FIG. 5 is a diagram showing a memory-controlled state of a memory in the reproducing system of the disk recording / reproducing apparatus of the above-mentioned embodiment.

FIG. 6 is a flowchart for explaining an operation of a main part of the above embodiment.

[Explanation of symbols]

 2 ... Magneto-optical disk 3 ... Optical head 4 ... Magnetic head 6 ... Servo control circuit 8 ... System controller 9 ... RAM 10・ ・ ・ Analog audio signal input terminal 13 ・ ・ ・ Data compression encoder 14, 22 ・ ・ ・ Memory 15 ・ ・ ・ Encoder 16 ・ ・ ・ Magnetic head drive circuit 21 ・ ・ ・..Decoder 23..decoder for data expansion 24..D / A converter 26..analog audio signal output terminal 31..battery 32, 33 .. ... Voltage stabilization circuit 34 ... Voltage detector 36 ... Backup battery

Claims (1)

[Claims] 1. A main power supply means for supplying main power, a backup power supply means, a voltage detection means for detecting a voltage of the main power supply means, and a TOC information storage for temporarily storing TOC information of recorded contents. And a control means for controlling the operation of each part of the apparatus, wherein when the voltage detection means detects that the output voltage of the main power supply means is lower than a predetermined threshold value,
An optical disk recording apparatus, characterized in that power from the backup power supply means is supplied to at least the control means and TOC information storage means.