JP3405358B2 - Optical disk recording device and optical disk reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for recording data such as audio data on an optical disk and an optical disk reproducing apparatus for reproducing data such as audio data recorded on the optical disk.

[0002]

2. Description of the Related Art An optical disk can have a recording capacity larger than that of a magnetic disk by about 2 to 3 digits, can be accessed at a higher speed than a tape-shaped recording medium, and can record data without contacting the medium. Moreover, since it can be reproduced and has excellent durability, it is widely used in place of magnetic data and magnetic tape. The so-called CD (compact disc) is most widely known as the optical disc.

When an optical disc is used to provide a portable headphone stereo device of a pocket size or the like and a recording and / or reproducing device similar thereto, the existing CD as described above has a disc diameter of 12c.
The size of m and the size of 8 cm (so-called CD single) are specified in the format, but the diameter is 12
In the case of a disc of cm, the outer size of the recording / reproducing apparatus becomes large and it is not possible to sufficiently support portability. Therefore, it is considered to use a disc of 8 cm or a smaller diameter. There are the following problems when a portable or pocket-sized recording and / or reproducing apparatus is constructed using the optical disk having a small diameter of about 8 cm or less.

First, the sampling frequency is 44.1 kHz.
Stereo digital PC quantized by 16 bits in z
In a standard CD format (CD-DA format) in which an optical disc on which an M audio signal is recorded is supplied from the manufacturer side and only reproduction is performed on the user side, the reproduction time (recording time) of a disc having a diameter of 8 cm is recorded. ) Is as short as 20 to 22 minutes at maximum, which means that it is not possible to record a single symphony of classical music. The maximum playback time is 7 which is the same as the current 12 cm CD.
A little over 4 minutes is desired. Moreover, in this CD-DA format, recording cannot be performed on the user side. Further, since the non-contact optical head is vulnerable to mechanical vibration, etc., and track deviation, focus deviation, etc. easily occur due to vibration, etc., when carrying the device, reproduction operations due to these track deviation, focus deviation, etc. may occur. Some measures are required to suppress the adverse effects of.

Next, the standard CD format (C
C as an extended format of D-DA format)
The D-MO format (format that uses a recordable magneto-optical disk) has a recording / reproducing time of 20 minutes for a disk having a diameter of 8 cm, which is the same as the CD-DA format.
It takes about 22 minutes, which is short. Further, a track shift or a focus shift of the optical head is apt to occur due to mechanical vibration or the like, and it is necessary to take measures to prevent adverse effects on recording and reproducing operations due to the shift. Next, CD-I (CD
In the (interactive) format, each level as shown in the following Table 1 is defined as a mode for recording / reproducing a bit-compressed digital audio signal.

[0006]

[Table 1]

In Table 1, for example, when reproducing a disc recorded in the level B mode, a signal obtained by bit-compressing a standard CD-DA format digital signal by about 4 times is reproduced. Therefore, for example, when all of the recorded data is stereo audio compression data, it becomes possible to reproduce for about four times as long (or for four channels), and even for an optical disk with a diameter of about 6 cm, about 70 minutes of recording is possible. Playback is possible.

[0008]

By the way, in the CD-I format, since the disc is rotationally driven at the same linear velocity as the standard CD-DA format, continuous audio compressed data is a unit of reproduction on the disc. It will be reproduced at a rate of 1 unit for every n units.
This unit is called a block or a sector. One block (sector) is 98 frames, and the cycle is
It is 1/75 second. n is a numerical value according to the reproduction time or the bit compression rate of data, and for example, in the stereo mode of level B, n = 4. Therefore, in this level B stereo mode, one sector per four sectors, such as SDDDDDSDDDD (where S is an audio sector and D is another data sector), in sector units. That is, a data string in which is the audio sector is recorded on the disc. However, at the time of actual recording, the above-mentioned data string is subjected to a predetermined encoding process (error correction encoding process and interleave process) similar to that for audio data of a normal CD format, so that the recording sector on the disk is The data of the audio sector S and the data of the data sector D are distributed and arranged. Here, for example, video data, computer data, or the like is used as the other data sector D. When a bit-compressed audio signal is also used as the data sector D, an audio sector for four channels is used.
.., which are data strings in which S1 to S4 are sequentially arranged cyclically, are encoded and recorded on the disc.

When recording and reproducing a continuous audio signal, the audio sector is recorded from the innermost circumference of the disc.
After reproducing the data of the first channel corresponding to S1 to the outermost circumference, it returns to the innermost circumference of the disc again, this time, reproduces the data of the second channel corresponding to the audio sector S2 to the outermost circumference, and then again to the disc. The data of the third channel corresponding to the next audio sector S3 from the innermost circumference is reproduced to the outermost circumference, and finally the data of the fourth channel corresponding to the remaining audio sector S4 is reproduced to the outermost circumference. By doing so, continuous four-time reproduction is performed.

However, in the continuous reproduction as described above, a long-distance track jump operation for returning from the outermost circumference to the innermost circumference is required several times. Since this track jump operation cannot be performed instantaneously, there is a big problem that the reproduced data is lost during this period and the reproduced sound is interrupted.

When recording a continuous audio signal, due to the interleave processing during recording,
For example, it is not possible to record only the signal of the sector S2 independently, and it is necessary to interleave the data of the adjacent sectors S1 and S3, or the peripheral sectors.
It is necessary to rewrite the signal of the already recorded sector. Therefore, it is very difficult to record such continuous compressed audio data, and real-time processing is practically impossible.

The present invention has been made in view of the above circumstances, and in an optical disc device using an optical disc such as a rewritable magneto-optical disc, audio data can be continuously recorded on the optical disc in real time. It is an object of the present invention to provide an optical disk recording apparatus having a function of detecting an abnormality in a recording operation such as a track jump due to a mechanical disturbance such as vibration or shock and re-recording data in cluster units. And

A further object of the present invention is to provide an optical disk reproducing apparatus which enables stable data reproduction without being affected by mechanical disturbance such as vibration or shock.

[0014]

In order to solve the above-mentioned problems, the present invention provides a disk for recording data by using an optical head on a track of a disk-shaped recording medium to which absolute time information is previously added. A recording device comprising an absolute time information reading means for reading the absolute time information, a storage means for storing data, a write address generation means for generating a write address of the storage means, and a read address of the storage means. A read address generating means for generating and a difference between the write address and the read address are detected, and when the difference is equal to or more than a predetermined amount, data is read from the storage means and the read data is stored in the disc-shaped recording medium. Recording command generating means for generating a recording command to record, and recording data on the disc-shaped recording medium according to the recording command. A recording unit, a tracking abnormality command generation unit that detects a tracking abnormality of the optical head, and generates a tracking abnormality command, and an access instruction that causes the optical head to access a desired track when the tracking abnormality command is given. In the recording operation by the access command generating means for generating and the recording means, the optical head is on-tracked on the track, and the optical head is track-jumped based on the recording command, and according to the access command. The recording command generation means stops the recording based on the recording command when the tracking abnormality command is input, and the recording read by the absolute time information reading means. Absolute time before stop and note When the absolute time after the stop coincides and the difference between the write address and the read address is equal to or more than a predetermined amount, the recording is restarted by the recording command, and the recording means intermittently operates based on the recording command. The data read from the storage means is recorded on the disc-shaped recording medium so as to be continuous before the recording is stopped and after the recording is restarted.

Further, the present invention is a disk reproducing apparatus for reproducing data recorded on a track of a disk-shaped recording medium to which absolute time information is previously added by using an optical head, and reads the absolute time information. An absolute time reading means, a reproducing means for demodulating the data read by the optical head from the disc-shaped recording medium, a storage means for storing the reproduced data demodulated by the reproducing means, and a storage means for storing the reproduced data. A write address generating means for generating a write address, a read address generating means for generating a read address of the recording means, a difference between the write address and the read address are detected, and when the difference is equal to or less than a predetermined amount, Playback command generating means for generating a playback command for reproducing data from the storage means and tracking difference between the optical heads. And a tracking abnormality command generating means for generating a tracking abnormality command, and an access command generating means for generating an access command for causing the optical head to access a desired track when the tracking abnormality command is given, Tracking control means for causing the optical head to be on-track on the track during the reproducing operation by the means, and for causing the optical head to make a track jump on the basis of the reproduction command and to access the track of the optical head according to the access command. When the tracking abnormality command is input, the reproduction command generating means stops the reproduction based on the reproduction command, and the absolute time before the reproduction stop read by the absolute time information reading means and the reproduction time after the reproduction stop. And the absolute time of If the difference between the scan and read address is equal to or less than a predetermined amount, the reproduction command by the resume playback, the reproducing means, the data read out from the intermittently the disc-shaped recording medium on the basis of the reproduction instruction,
The data is written in the storage means so as to be continuous before the reproduction is stopped and after the reproduction is restarted.

[0016]

In the optical disk recording apparatus according to the present invention, when the track jump detecting means detects a generated track jump when recording data on the optical disk, the track jump occurs based on the detected track jump and then the track jump detection is resumed. Until then, the read operation of the read means for recording data is stopped, and after the recovery, the read operation of the read means is restarted. When the reading means restarts the reading operation,
Based on the control of the recording position of the optical disc by the recording position control means, data is recorded on the optical disc in a continuous state before the recording is stopped by the occurrence of the track jump and after the recording is restarted by the recovery.

Further, in the optical disk reproducing apparatus according to the present invention, when the track jump detecting means detects a track jump when reproducing data from the optical disk, the track jump occurs based on the detected track jump, and then the optical disk reproducing device returns. Until then, the writing operation of the writing means is stopped, and after the recovery, the writing operation of the writing means is restarted. When the playback data writing means resumes writing,
Based on the control of the reproduction position of the optical disc by the reproduction position control means, the data is reproduced from the optical disc in a continuous state before the reproduction is stopped by the occurrence of the track jump and after the reproduction is resumed by the recovery.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk device to which the present invention is applied will be specifically described below with reference to the drawings.

The optical disk device according to the present invention has a structure as shown in FIG. 1, and a magneto-optical disk 2 which is rotationally driven by a spindle motor 1 is used as a recording medium. Data is recorded along the recording tracks of the magneto-optical disk 2 by applying a modulation magnetic field according to the recording data to the magneto-optical disk 2 in a state where the optical head 3 irradiates the laser light, for example. (So-called magnetic field modulation recording) is performed, and the recording track of the magneto-optical disk 2 is traced by the laser light emitted from the optical head 3 to reproduce the data magneto-optically.

The optical head 3 is composed of, for example, 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 photodetector divided into a predetermined arrangement. It is provided at a position facing the magnetic head 4 with a gap 2 in between. When recording data on the magneto-optical disk 2, the optical head 3 drives the magnetic head 4 by a head drive circuit 16 of a recording system, which will be described later, and applies a modulation magnetic field according to the recording data. Data recording is performed by thermomagnetic recording by irradiating the target track with laser light. The optical head 3 detects the focus error by the astigmatism method or the tracking error by the push-pull method by detecting the reflected light of the laser light applied to the target track, and the data from the magneto-optical disk 2 is detected. When reproducing, the reproduction signal is generated by detecting the difference in the polarization angle (Kerr rotation angle) of the reflected light of the laser light from the target track.

The output of the optical head 3 is supplied to the RF circuit 5. The RF circuit 5 extracts the focus error signal and the tracking error signal from the output of the optical head 3 and supplies them to the servo control circuit 6, and also binarizes the reproduction signal to supply it to a reproduction system decoder 21 described later. further,
These signals are supplied to the abnormality detection circuit 30.

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, and a sled servo control circuit. 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. Further, 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 rotate the magneto-optical disk 2 at a predetermined rotation speed (for example, a constant linear speed). Further, the sled servo control circuit sets the optical head 3 at the target track position of the magneto-optical disk 2 designated by the system controller 7.
And the magnetic head 4 is moved. The servo control circuit 6 performing such various control operations supplies the system controller 7 with information indicating the operating state of each part controlled by the servo control circuit 6.

Further, as shown in FIG. 2, the abnormality detecting circuit 30 is a focus monitoring circuit for monitoring the focus state of the optical head 3 based on the focus error signal supplied from the RF circuit 5 to detect the defocus state. 31 and a track jump detection circuit 32 that also detects the occurrence of a track jump based on the tracking error signal,
A discontinuity detection circuit 33 for detecting discontinuity of sub-Q data and header time is provided, and the detection outputs of these circuits are supplied to the system controller 7 as abnormality detection output signals.

The system controller 7 is connected to a key input operation section 8 and a display section 9. The system controller 7 controls the recording system and the reproducing system in the operation mode designated by the operation input information from the key input operation unit 8. The system controller 7 also records the recording tracks traced by the optical head 3 and the magnetic head 4 on the basis of address information in sector units reproduced from the recording tracks of the magneto-optical disk 2 by header time, sub-Q data, or the like. Manage the recording and playback positions above. The system controller 7 further includes bit compression mode information in the ADPCM encoder 13 which will be described later, which is switched and selected by the key input operation unit 8, and bit compression mode in reproduction data which is obtained from the RF circuit 5 via a reproduction system described later. The bit compression mode is displayed on the display unit 9 based on the information, and the reproduction time is displayed on the display unit 9 based on the data compression rate in the bit compression mode and the reproduction position information on the recording track. .

This reproduction time display is the reciprocal of the data compression rate in the bit compression mode in the address information (absolute time information) in sector units reproduced from the recording track of the magneto-optical disk 2 by the header time, sub-Q data and the like. By multiplying (for example, 4 in the case of 1/4 compression), the actual time information is obtained and displayed on the display unit 9. Even at the time of recording, for example, when absolute time information is previously recorded (pre-formatted) on a recording track of a magneto-optical disk or the like,
By reading this pre-formatted absolute time information and multiplying it by the reciprocal of the data compression rate, it is also possible to display the current position with the actual recording time.

Here, the recording system of this optical disk device is
A / D converter 1 to which an analog audio signal A _IN is supplied from an input terminal 10 via a low-pass filter 11
Equipped with 2.

The A / D converter 12 outputs the audio signal A
_The digital audio data obtained by quantizing _IN and obtained from the A / D converter 12 is ADPCM (Adaptive Di
fferential pulse code modulation) encoder 13 is supplied. The ADPCM encoder 13 performs a data compression process corresponding to various modes in the CD-I system shown in Table 1 on digital audio data having a predetermined transfer rate obtained by quantizing the audio signal A _IN by the A / D converter 12. The operation mode is specified by the system controller 7.
For example, in the B level mode of Table 1, the sampling frequency is 37.8 kHz and the number of bits per sample is 4
The compressed data of bits (ADPCM audio data) is supplied to the memory 14. The data transfer rate in the B-level stereo mode is reduced to 18.75 sectors / second.

Here, the optical disk device shown in FIG.
The sampling frequency of the D converter 12 is, for example, standard C
4 which is the sampling frequency of D-DA format
It is fixed at 4.1 kHz, and in the ADPCM encoder 13, sampling rate conversion according to the compression mode (for example, 44.1 kHz to 37.
It is assumed that the bit compression process from 16 bits to 4 bits is performed after the conversion to 8 kHz). As another configuration example, the sampling frequency itself of the A / D converter 12 may be switch-controlled in accordance with the compression mode. In this case, the sampling of the switch-controlled A / D converter 12 is performed. The cutoff frequency of the low-pass filter 11 is also switched and controlled according to the frequency. That is, the sampling frequency of the A / D converter 12 and the cutoff frequency of the low pass filter 11 may be simultaneously switched and controlled according to the compression mode.

Next, in the memory 14, the writing and reading of data are controlled by the system controller 7, and
It is used as a buffer memory for temporarily storing ADPCM audio data supplied from the DPCM encoder 13 and continuously recording it on the disc as needed. That is, in the B level stereo mode, the compressed audio data supplied from the ADPCM encoder 13 has its data transfer rate reduced to 18.75 sectors / second, and this compressed data is continuously stored in the memory 14. Written. As for this compressed data (ADPCM data), it is sufficient to record one sector for every four sectors as described above, but such recording for every four sectors is practically impossible in real time. I am trying to record continuously. This recording is performed in bursts at 75 sectors / second with a cluster consisting of a plurality of predetermined sectors (for example, 32 sectors) as a recording data unit through the pause period. That is, in the memory 14, ADPCM audio data in the B level stereo mode continuously written at a low transfer rate of 18.75 (= 75/4) sectors / second according to the bit compression rate is recorded as 75 It is read in bursts at a transfer rate of sectors / second. For this read and recorded data, the overall data transfer rate including the recording pause period is 18.75.
Although the speed is as low as the sector / second, the instantaneous data transfer speed within the time of the burst recording operation is the standard 75 sectors / second. Therefore, when the disc rotation speed is the same as the standard CD-DA format (constant linear velocity), the same recording density and storage pattern as those of the CD-DA format are recorded.

The ADPCM audio data, that is, the recording data, which is burst-read from the memory 14 at a transfer rate of 75 sectors / second is supplied to the encoder 15. Here, in the data string supplied from the memory 14 to the encoder 15, the unit to be continuously recorded in one recording is a cluster consisting of a plurality of sectors (for example, 32 sectors) and a cluster connection arranged at the front and rear positions of the cluster. There are several sectors for use. This cluster connection sector 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 from the memory 14 in bursts as described above.
Encoding processing for error correction (parity addition and interleave processing), 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 4 is connected to the magnetic head drive circuit 16 and drives the magnetic head 4 so as to apply a modulation magnetic field according to recording data to the magneto-optical disk 2.

Further, the system controller 7 performs the above-mentioned memory control on the memory 14, and continuously records the recording data read from the memory 14 in a burst on the recording track of the magneto-optical disk 2 by this memory control. The recording position is controlled as follows. To control the recording position, the system controller 7 manages the recording position of the recording data that is burst-read from the memory 14, and the servo control circuit 6 sends a control signal that specifies the recording position on the recording track of the magneto-optical disk 2. It is done by supplying.

Further, when an abnormal situation such as a track jump or a defocus state occurs during the recording operation, the system controller 7 immediately outputs the optical head based on the abnormality detection signal from the abnormality detection circuit 30. The laser power of 3 is reduced to prevent erroneous recording, and in this state, the recording system is controlled to return from the abnormal state to the normal state.

Next, the reproducing system in this optical disk device will be described.

This reproducing system is for reproducing the record data continuously recorded on the recording track of the magneto-optical disk 2 by the recording system as described above, and the recording track of the magneto-optical disk 2 by the optical head 3. Is provided with a decoder 21 to which a reproduction output obtained by tracing the laser beam with the laser light is binarized by the RF circuit 5 and supplied.

The decoder 21 corresponds to the encoder 15 in the above-mentioned recording system, and performs the above-mentioned decoding processing for error correction and EFM decoding on the reproduction output binarized by the RF circuit 5. By performing processing such as processing, the ADPCM audio data in the B-level stereo mode described above is reproduced at a transfer rate of 75 sectors / second which is faster than the normal transfer rate in the B-level stereo mode. The reproduced data obtained by the decoder 21 is supplied to the memory 22. In the memory 22, the writing and reading of data are controlled by the system controller 7, and the reproduction data supplied from the decoder 21 at a transfer rate of 75 sectors / second is written in bursts at the transfer rate of 75 sectors / second. This memory 22
The reproduced data written in burst at a transfer rate of 75 sectors / second is a normal 1 in the B level stereo mode.
It is continuously read at a transfer rate of 8.75 sectors / second.

The system controller 7 controls the memory so that the reproduction data is written into the memory 22 at a transfer rate of 75 sectors / second and the reproduction data is continuously read from the memory 22 at a transfer rate of 18.75 sectors / second. I do.

Further, the system controller 7 performs the above-mentioned memory control on the memory 22, and continuously reproduces the above-mentioned reproduced data written in the memory 22 in burst from the recording track of the magneto-optical disc 2 by the memory control. The playback position is controlled so as to play back. The reproduction position is controlled by controlling the reproduction position on the recording track of the magneto-optical disk 2 of the reproduction data written in a burst in the memory 22 by the system controller 7 and designating the reproduction position. Is supplied to the servo control circuit 6.

The B-level stereo mode ADPCM audio data obtained as reproduction data continuously read from the memory 22 at a transfer rate of 18.75 sectors / second is supplied to the ADPCM decoder 23. The ADPCM decoder 23 corresponds to the ADPCM decoder 13 of the recording system, the operation mode is designated by the system controller 7, and in this optical disc apparatus, the BPCM stereo mode ADPCM audio data is expanded four times. Plays digital audio data. The ADPCM decoder 23 supplies the digital audio data to the D / A converter 24.

The D / A converter 24 analogizes the digital audio data supplied from the ADPCM decoder 23 to form an analog audio signal A _OUT . The analog audio signal A _OUT obtained by the D / A converter 24 is output from the output terminal 26 via the low pass filter 25.

The reproducing system of the optical disc apparatus of this example also has a digital output function, and the ADPCM decoder 23 outputs the digital audio data as the digital audio signal D _OUT from the digital output terminal 28 through the digital output encoder 27. To be done.

The recording / reproducing operation of the optical disc apparatus according to the present invention as described above will be described in more detail.

First, the recorded data (data read from the memory 14) is clustered into a fixed number (for example, 32) of sectors (or blocks), and some of these clusters are connected for cluster connection. The sector is arranged. Specifically, as shown in FIG. 3, the cluster C _n is composed of 32 sectors (blocks) B0 to B31, and 5 connecting (linking) sectors L1 are provided between these clusters C _n. ~ L5 is arranged and connected to the adjacent cluster. Here, when recording one cluster, for example, the k-th cluster C _k , not only the 32 sectors B0 to B31 of this cluster C _k but also the connection sectors of the front and rear three sectors, that is, the cluster C _k. Recording is performed in units of 38 sectors including three sectors L3 to L5 (run-in block) on the _-1 side and three sectors L1 to L3 (run-out block) on the cluster C _{k + 1} side. I am trying to do it. At this time, the encoder 15
By interleaving processing at
Distances of eight frames (corresponding to about 1.1 sectors) are rearranged, but the data in the cluster C _{k is} within the range from the run-in blocks L3 to L5 to the run-out blocks L1 to L3. It is sufficiently set and does not affect other clusters C _k−1 and C _{k + 1} . Note that damaging data such as 0 is arranged in the linking sectors L1 to L5, so that adverse effects on the original data due to the interleave processing can be avoided. Further, when recording the next cluster C _{k + 1} , three sectors L3 to L5 of the five linking sectors L1 to L5 with the cluster C _k are used as run-in blocks.
Sector L3 will be recorded redundantly, but there is no problem. Further, recording may be performed in units of 3 sectors excluding one block L3 of the run-in block or the run-out block.

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 can be performed in cluster units, and if effective data reading cannot be performed during playback, clustering can be performed. Rereading can be done in units.

In this optical disk device, the system controller 7 performs a recording control operation as shown in the flowchart of FIG. 4, for example, in the recording mode.

That is, in the recording mode, the system controller 7 first waits for the recording data for one cluster to be prepared in step S ₁ , and when recording data for one cluster is prepared, moves to step S ₂ . Then, the optical head 3 and the magnetic head 4 are accessed to record the recording data for one cluster on the magneto-optical disk 2. Then, in the next step S _3, 1 to monitor the completion of the recording of a cluster of the recording data, the process shifts to a step S ₄ Once finished the recording of the record data of one cluster, the laser power of the optical head 3 Set the playback level. Then, in the next step S ₅ , it is determined whether or not the recording of all the recording data is completed, and if there is the recording data, the step S ₁
To continue the recording operation, and when the recording is completed, the recording mode control operation is completed. Furthermore, step S
1 recording end cluster of the recording data in the ₃ during the monitoring, step S ₆ in performs abnormality detection circuit 30 determines abnormality of whether or not it is detected by, when an abnormality is not detected step S ₃ It continues to monitor operation returns to, also, when an abnormality is detected, proceeds to step S _7, immediately set the laser power of the optical head 3 to the reproducing level. Then, by returning the abnormal state of the recording system in the next step S _8, step S ₂ after setting again at the beginning of the cluster an abnormality is detected the recording data in step ₉
Return to and restart the recording operation.

In this way, the recording operation is performed in cluster units, and when an abnormality is detected by the abnormality detection circuit 30 during the recording operation, the recording is restarted from the beginning of the cluster, and the continuity of the recording data is increased. Can be secured. By the way, one sector (block) consists of 2352 bytes, and 12 bytes for synchronization, 4 bytes for header, and 2336 bytes for data D0001 to D2336 are arranged in this order from the beginning. This sector structure (block structure) is represented as two-dimensional array data as shown in FIG. 5, and the first 12 bytes of 12 bytes for synchronization are 0.
0H (H indicates a hexadecimal number) is followed by 10 bytes of FFH, and the last 1 byte is 00H. The next 4-byte header consists of 1 byte each for minutes, seconds, and the address portion of the block, followed by 1 byte for mode information. This mode information is mainly CD-R
This is for showing the OM mode, and the sector structure shown in FIGS. 3 and 5 corresponds to mode 2 of the CD-ROM mode. CD-I is a standard using this mode 2, and the contents of D0001 to D0008 of the above data are defined as shown in FIG.

FIG. 7 shows Form 1 and Form 2 of the CD-I standard. 12 bytes for synchronization and 4 bytes for header are used for mode 2 of the CD-ROM (see FIGS. 3 and 5).
(See) is the same. The next 8 bytes for the subheader are defined as shown in FIG. 6, and data D0001,
D0005 is a file number, data D0002 and D0006 are channel numbers, data D0003 and D0007 are submode information, and data D0004 and D0008 are data type information.
The data D0001 to D0004 and D0005 to D0008 have the same content written twice. The following 2328 bytes consist of 2048 bytes for user data, 4 bytes for error detection, 172 bytes for P parity, and 104 bytes for Q parity in Form 1 shown in FIG. 7A. This form 1 is used for recording character information, binary data, highly compressed video data and the like. In the form 2 shown in FIG. 7B, 2324 bytes below the subheader are user data, and the remaining 4 bytes are reserved data. This form 2 is used for recording compressed audio data and video data. In the case of compressed audio data, 2324 of user data
Within the bytes, 18 groups (2304 bytes) of 128-byte sound groups are arranged, and the remaining 20 bytes are free space.

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. Figure 8
Recording is performed in the recording format as shown in.

In FIG. 8, 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.
It is 588 times (588T) of 24T (+
Frame synchronization pattern part of connection bit 3T), 14T
(+ Connection bit 3T) subcode part and 544T
Data portion (audio data and parity data) is provided. The data portion of 544T includes 12 bytes (12 symbols) of audio data, 4 bytes of parity data, 12 bytes of audio data, and 4 bytes.
The byte parity data is so-called EFM-modulated, and the audio data in one frame is 24 bytes (that is, 1 word of audio sample data is 1
Since it is 6 bits, it is 12 words). The sub-code portion is 8-bit sub-code data subjected to EFM modulation, 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 that are out of the EFM modulation rule (out-of-rule), and each subcode channel P to W is from the third frame to the third frame. There are 96 bits each for up to 98 frames.

Although the audio data is interleaved and recorded, it is deinterleaved at the time of reproduction to obtain audio data having a data array in the order of time. Instead of this audio data, for example, CD-I data as shown in FIGS. 5 and 7 can be recorded.

By the way, in the optical disk device according to the present invention shown in FIG. 1, the digital data obtained from the A / D converter 12 is the same data as the CD-DA format, that is, the sampling frequency 4 as shown in FIG.
The audio PCM data is 4.1 kHz, the quantization bit number is 16 bits, and the data transfer rate is 75 sectors / second.
This is sent to the ADPCM encoder 13 and, for example, B
When bit-compressed to level stereo mode,
First, the rate is converted to a sampling frequency of 37.8 kHz, and the number of quantization bits is compressed to 4 bits, so that it is output as ADPCM audio data of 18.75 sectors / sec with a data transfer rate of 1/4. . The B-level stereo mode ADPCM audio data continuously output from the ADPCM encoder 13 at a transfer rate of 18.75 sectors / second is supplied to the memory 14.

As shown in FIG. 10, the system controller 7 continuously increments the write pointer W of the memory 14 at a transfer rate of 18.75 sectors / second to thereby add the ADPCM audio data to the memory 14.
When the data amount of the ADPCM audio data stored in the memory 14 reaches a predetermined amount K or more and the data is continuously written to the memory 1 at a transfer rate of 18.75 sectors / sec.
The read pointer R of 4 is incremented in a burst manner at a transfer rate of 75 sectors / sec, and the ADP is read from the memory 14.
Memory control is performed so that CM audio data is recorded as recording data in bursts at a transfer rate of 75 sectors / second by a predetermined amount K. However, the predetermined amount is based on the data amount of one cluster.

That is, in the recording system of the optical disk device shown in FIG. 1, the ADPCM encoder 13 outputs, for example, 1 by the memory control by the system controller 7.
Continuously output at a transfer rate of 8.75 sectors / second A
When the DPCM audio data is written in the memory 14 at the transfer rate of 18.75 sectors / second and the data amount of the ADPCM audio data stored in the memory 14 becomes a predetermined amount K or more, the ADPCM audio data is read from the memory 14
The audio data is recorded data, and the predetermined amount K is 75.
Since burst data is read at a transfer rate of sectors / second, it is possible to continuously write input data to the memory 14 while always securing a free space of a predetermined amount or more in the memory 14. Here, the recording data read out in burst from the memory 14 is recorded in a continuous state 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 7. can do. Moreover, as described above, since the memory 14 always has a free area of a predetermined amount or more, the system controller 7 detects that a track jump or the like has occurred due to disturbance or the like, and interrupts the recording operation on the magneto-optical disk 2. Even in this case, the input data can be continuously written in the empty area of a predetermined amount or more, and the recovery processing operation can be performed in the meantime, and the input data input in real time is continuously recorded on the recording track of the magneto-optical disk 2. Can be recorded in the state.

In the magneto-optical disk 2, header time data corresponding to the physical address of the sector is ADPCM.
Each sector is added to the audio data and recorded.
In addition, inventory data indicating the recording area and the recording mode is recorded in the inventory area.

Next, in the reproducing system in the optical disc device shown in FIG. 1, the system controller 7 sets the write pointer W of the memory 22 to 75 sectors /
The read data is written in the memory 22 at a transfer rate of 75 sectors / second, and the read pointer R of the memory 22 is continuously incremented at a transfer rate of 18.75 sectors / second. Playback data is continuously read from the memory 22 at a transfer rate of 18.75 sectors / second, and when the write pointer W catches up with the read pointer R, writing is stopped, and the data amount of the playback data stored in the memory 22 is When the amount becomes equal to or less than the predetermined amount L, the write pointer W of the memory 22 is burst-incremented at a transfer rate of 75 sectors / second to perform memory control.

In the reproducing system of such an optical disk device, B is reproduced from the recording track of the magneto-optical disk 2 by the memory control by the system controller 7.
Burst memory 22 for level stereo mode ADPCM audio data at a transfer rate of 75 sectors / sec.
Since the ADPCM audio data is continuously read from the memory 22 as reproduction data at a transfer rate of 18.75 sectors / second, the memory 22 is always reproduced while securing a predetermined amount of data L or more. Data can be continuously read from the memory 22. The reproduction data read out in bursts from the magneto-optical disk 2 is reproduced continuously from 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 7. can do. Moreover, as described above, since the memory 22 always secures a predetermined amount of data L or more, the system controller 7 detects that a track jump or the like has occurred due to disturbance or the like, and the magneto-optical disk 2 is thus detected.
Even when the reproduction operation for is stopped, the reproduction data stored in the memory 22 can be read and the output of the analog audio signal can be continued, and the recovery processing operation can be performed during that time. Therefore, no sound interruption occurs.

Here, in this optical disc apparatus, the recording / reproducing of ADPCM audio data in the B level stereo mode has been described, but the recording / reproducing of the ADPCM audio data in other modes in other CD-I systems is similarly performed. It can be carried out. In addition, CD-DA
Regarding the PCM audio data of the mode, in the recording system, the time axis compression processing is performed in the memory 14, and the recording data is recorded while the magneto-optical disk 2 is driven to rotate at a speed corresponding to the compression ratio of the time axis compression processing. Further, in the reproducing system, the time axis expansion processing may be performed in the memory 22.

[0059]

As described above, in the optical disk recording apparatus according to the present invention, when the track jump detecting means detects a track jump when recording data on the optical disk, the track jump is detected based on the detected track jump. When the read operation of the recording data is stopped from the time of occurrence to the return and the read operation of the read means is restarted after the return, the track is controlled based on the control of the recording position of the optical disc by the recording position control means. Data is recorded on the optical disk in a continuous state before recording is stopped due to a jump and after recording is restarted due to a recovery, so even if an error such as a track jump occurs during recording, the recorded data will continue to be recorded. It is possible to secure the recordability.

Further, in the optical disk reproducing apparatus according to the present invention, when the track jump detecting means detects the track jump when reproducing the data from the optical disk, the track jump occurs based on the detected track jump and then the track jump is recovered. Until then, when the writing operation of the writing means is stopped and the writing operation of the writing means is restarted after the recovery, the reproduction is stopped by the occurrence of the track jump based on the control of the reproduction position of the optical disc by the reproduction position control means. Since the data is played back from the optical disk in a continuous state after the playback is restarted by the previous and the return, even if an abnormality such as a track jump occurs during the playback, the continuity of the recorded data is ensured and the data is recorded. Can be played.

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical disk device to which the present invention is applied.

FIG. 2 is a block diagram showing an abnormality detection circuit provided in an optical disk device to which the present invention is applied.

FIG. 3 is a diagram showing a format of a cluster structure which is a recording unit.

FIG. 4 is a flowchart showing a recording mode control operation of a system controller in an optical disc device to which the present invention is applied.

FIG. 5 is a diagram showing an example of a data structure of one sector (one block).

FIG. 6 is a diagram showing the contents of a subheader.

FIG. 7 is a diagram showing a data structure in a sector of CD-I.

FIG. 8 is a diagram showing formats of frames and blocks (sectors) in the CD standard.

FIG. 9 is a diagram showing a data format used in an optical disc device to which the present invention is applied.

FIG. 10 is a diagram showing a state of a memory-controlled memory in a recording system of an optical disk device to which the present invention is applied.

FIG. 11 is a diagram showing a memory-controlled memory state in a reproducing system of an optical disc device to which the present invention is applied.

[Explanation of symbols]

2 magneto-optical disk, 3 optical head, 4 magnetic head, 6 servo control circuit, 7 system controller, 12 A / D converter, 13 ADPCM encoder, 14 memory, 15 encoder, 16
Magnetic head drive circuit, 22 memory, 23 ADP
CM decoder, 30 abnormality detection circuit, 32 track jump detection circuit.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI // G11B 21/10 G11B 21/10 P (56) References JP-A-4-103074 (JP, A) JP-A-4-103079 (JP , A) JP 4-105269 (JP, A) JP 4-105270 (JP, A) JP 4-105271 (JP, A) JP 4-105272 (JP, A) JP 4-105273 (JP, A) JP 4-105274 (JP, A) JP 4-105278 (JP, A) JP 5-6572 (JP, A) JP 10-91974 (JP, A) JP 10-91979 (JP, A) JP 11-242817 (JP, A) JP 1-144281 (JP, A) JP 1-171187 (JP, A) JP 1 -232542 (JP, A) JP-A-55-12537 (JP, A) JP-A-55-12538 (JP, A) JP-A-55-113172 (JP, A) JP-A-56-62488 (JP-A) ) JP-A-56-119901 (JP, A) JP-A-56-119902 (JP, A) JP-A-57-104386 (JP A) JP-A-57-133569 (JP, A) JP-A-58-122675 (JP, A) JP-A-59-75465 (JP, A) JP-A-59-117762 (JP, A) JP-A-59 -167879 (JP, A) JP 59-167880 (JP, A) JP 60-254467 (JP, A) JP 64-70975 (JP, A) JP 2000-149268 (JP, A) JP-A-2000-215455 (JP, A) JP-A-2001-291357 (JP, A) JP-A-2002-100051 (JP, A) JP-A-61-139984 (JP, A) JP-A-61-139933 (JP, A) Japanese Patent Laid-Open No. 1-312736 (JP, A) Actual Opening Sho 60-175367 (JP, U) Actual Opening Sho 60-175368 (JP, U) Actual Opening Sho 63-109371 (JP, U) Special Table Sho 62 -502003 (JP, A) Patent 2988520 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 20/10-20/16 G11B 7/004-7 / 0055,7 / 30 G11B 11/105

Claims (2)

(57) [Claims] 1. A disk recording apparatus for recording data on a track of a disk-shaped recording medium, to which absolute time information is previously added, by using an optical head, and an absolute time information reading means for reading the absolute time information. A storage means for storing data, a write address generation means for generating a write address of the storage means, a read address generation means for generating a read address of the storage means, and a difference between the write address and the read address. And a recording command generating means for generating a recording command for recording the read data on the disc-shaped recording medium when the difference is equal to or more than a predetermined amount. According to the recording means for recording data on the disc-shaped recording medium, and the tracking abnormality of the optical head is detected. Tracking abnormality command generating means for generating a tracking abnormality command, access command generating means for generating an access instruction for causing the optical head to access a desired track when the tracking abnormality command is given, and recording operation by the recording means. Sometimes, the optical head is on-track on the track, and the optical head is track-jumped based on the recording command, and a tracking control unit for accessing the track of the optical head according to the access command is provided. The recording command generation means stops recording based on the recording command when the tracking abnormality command is input, and the absolute time before the recording stop read by the absolute time information reading means and the absolute time after the recording stop. Match, and read the above write address. When the difference between the output addresses is equal to or more than a predetermined amount, the recording is restarted by the recording command, and the recording unit records the data read from the storage unit intermittently based on the recording command as before the recording is stopped. A disk recording apparatus for recording on the above-mentioned disk-shaped recording medium so as to continue after restarting. 2. A disc reproducing apparatus for reproducing data recorded on a track of a disc-shaped recording medium, to which absolute time information is previously added, by using an optical head, wherein the absolute time reading means reads the absolute time information. Reproducing means for demodulating the data read by the optical head from the disc-shaped recording medium, storing means for storing the reproduced data demodulated by the reproducing means, and a write address for the storing means. Write address generating means, read address generating means for generating the read address of the recording means, and a difference between the write address and the read address is detected. A reproduction command generating means for generating a reproduction command to reproduce data, and a tracking abnormality of the optical head are detected. Tracking abnormality command generating means for generating a tracking abnormality command, access command generating means for generating an access command for causing the optical head to access a desired track when the tracking abnormality command is given, and reproduction operation by the reproducing means. At the time, the optical head is on-track on the track, and the optical head is track-jumped on the basis of the reproduction command, and a tracking control means for accessing the track of the optical head according to the access command is provided. When the tracking abnormality command is input, the reproduction command generation means stops reproduction based on the reproduction command, and the absolute time before the reproduction stop read by the absolute time information reading means and the absolute time after the reproduction stop. And the above write address and read When the address difference is less than or equal to a predetermined amount, the reproduction is restarted by the reproduction command, and the reproduction means intermittently reads the data read from the disc-shaped recording medium based on the reproduction command as before the reproduction is stopped. A disc reproducing apparatus for writing data in the storage means so as to continue after reproduction is resumed.