JP3225741B2 - Optical disk and optical disk recording 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 for recording and reproducing information signals and an optical disk recording apparatus for recording information signals on the optical disk.

[0002]

2. Description of the Related Art Conventionally, when recording digital data of a computer or voice in an optical disk apparatus, a recording track is previously provided on an optical disk to be recorded, and the recording track is provided with address information in advance and has an appropriate length. The data is divided into areas called sectors, and data recording is performed in sector units.

On the other hand, the upper limit of the transfer rate of data recorded on the optical disk is physically determined by the recording wavelength of the laser, the relative speed between the optical head and the optical disk, and the like. In a data file device that records computer data, etc., the transfer rate of digital data sent from the computer is faster than the recording transfer rate of the disk device. It responds by doing. Also, a device for digitally compressing and recording audio has a recording transfer rate capable of recording uncompressed digital audio data. It becomes possible to record at the speed. Therefore, as an actual recording operation,
The operation of temporarily storing the recording data in the buffer memory, storing the recording data once more than a certain amount, and recording the data collectively is repeated.

As described above, in the conventional apparatus for recording digital data, there is a large difference between the recording transfer rate and the data input speed, and the higher one of them has a method of waiting.

[0005]

However, in a device such as a digital video disk which digitizes and records a video signal, the speed of digital video data to be recorded is supplied in real time at a speed close to the upper limit of the recording transfer rate of the device. Therefore, it is technically difficult for the recording transfer rate of the recording apparatus to greatly exceed the speed of the input digital data. Therefore, recording of digital video data is actually performed in synchronization with the input speed. However, in this configuration, if a track is lost due to an external impact or the like during the recording operation, the recording is interrupted from that moment, and even if the track returns to the recordable state, the data until the return is lost. However, this has reduced the seismic performance and reliability of the entire device.

The present invention has been made in view of the above problems, and provides an optical disk and an optical disk recording apparatus which guarantee the continuity of recorded data for a certain period even if a track is deviated due to an external impact or the like.

[0007]

In order to solve the above problems, an optical disk recording apparatus according to a first aspect of the present invention includes an optical head for accessing a track formed on an optical disk and recording information, and an optical head for the optical head. An optical head control means for detecting a tracking error signal when recording information and driving the optical head, a spindle motor for rotating the optical disk at a constant rotation speed, and an address previously recorded on the track of the optical disk; Address information identifying means for identifying address information for identifying information, storage means for temporarily storing and reading input information input at the time of recording, and digital data connected to the optical head and read from the storage means Recording means for converting the intermittent recording period according to the amount of digital data in the storage means and recording The optical disc and the optical disc recording apparatus according to the second aspect of the present invention are provided with a system control means for controlling the body, wherein the track provided on one or both sides of the disk has a predetermined length equal to or longer than a predetermined length. In each of the divided sectors, an address information area, an information recording area for recording information, and a mode recording area for recording recording density information obtained by encoding a clock frequency when an information signal is recorded in the information recording area. An optical disk having the arranged format, an optical head for accessing a track formed on the optical disk and recording information, and connected to the optical head to detect a tracking error signal when recording information and to drive the optical head Optical head control means, a spindle motor for rotating the optical disk, and recording in advance on the track of the optical disk Address information identifying means for identifying the address information for identifying the input address information, storage means for temporarily storing and reading the input information input at the time of recording, and read from the storage means connected to the optical head. A recording means for converting the digital data and changing the recording clock frequency in accordance with the amount of digital data in the storage means for recording; and a system control means for controlling the entire apparatus. An optical disk and an optical disk recording apparatus according to a third aspect of the present invention include:
An optical disc provided with a mode area for recording modulation code identification information obtained by encoding a type of a recording modulation code when an information signal is recorded in an information recording area, and a recording means of the optical disc recording apparatus of the second invention, An optical disc recording apparatus having a recording means for changing the type of recording modulation code according to the amount of digital data in the storage means and recording the same; The recording device arranges an address information area and an information recording area for recording information in each sector obtained by dividing a track provided on one side or both sides of the disk into a predetermined length or more, and arranges the outer periphery of the disk. The area formed by the plurality of sectors on the side of the optical disk is an emergency recording area, and the area formed by sectors other than the sectors belonging to the emergency recording area is the normal recording area. An optical head for accessing a track formed on an optical disk and recording information, and an optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head, A spindle motor for rotating the optical disc, address information identifying means for identifying address information for identifying address information pre-recorded on the track of the optical disc, and temporarily storing and reading input information input during recording A storage unit, a recording unit connected to the optical head for converting the digital data read from the storage unit and recording the digital data through the optical head; and storing address information immediately before the optical head is moved when the optical head is moved. The apparatus has a configuration including a history information storage unit and a system control unit that controls the entire apparatus. The optical disc and the optical disc recording apparatus according to the present invention are arranged such that the optical disc according to the fourth aspect of the present invention includes an internal or external normal recording area, an internal or external emergency recording area, a normal recording area to an emergency recording area, or an emergency recording area. An optical disc provided with a history information recording area for recording at least one of the address information of the source sector and the address information of the destination sector when the track jumps from the hour recording area to the normal recording area; An optical disc recording apparatus having a function of operating the fourth optical disc recording apparatus to record track jump history information in the history information recording area provided on the optical disc; An optical disc recording apparatus according to a sixth aspect of the present invention provides an optical disc recording apparatus for accessing a track formed on an optical disc to record information. A head, an optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head, a spindle motor for rotating the optical disc, and a pre-recorded track on the track of the optical disc. Address information identifying means for identifying address information for identifying address information, information compressing means for compressing and encoding input information input at the time of recording, and temporarily storing digital data encoded by the information compressing means. Storage means connected to the optical head, recording means for converting the digital data read from the storage means and recording the data through the optical head, and system control means for controlling the entire apparatus. Means for changing the compression ratio according to the amount of digital data stored in the storage means; Are those having the Ranaru configuration,
An optical disc recording apparatus according to a seventh aspect of the present invention provides a method for changing the compression ratio of the optical disc apparatus according to the sixth aspect,
An optical disk recording apparatus according to an eighth aspect of the present invention comprises means for changing a compression ratio for a predetermined period after detecting an off-track, and an optical head for accessing a track formed on the optical disk and recording information. An optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head; a spindle motor for rotating the optical disk; and information recorded in advance on the track of the optical disk. Address information identifying means for identifying address information, ECC encoding means for adding an error correction code to input information inputted at the time of recording, and storage means for temporarily storing and reading digital data encoded by the ECC encoding means And the digital data connected to the optical head and read from the storage means. A recording means for performing recording through the optical head; and a system control means for controlling the entire apparatus. The error correction code added by the ECC encoding means according to the amount of digital data in the storage means. An optical disk recording apparatus according to a ninth aspect of the present invention includes: an optical head that accesses a track configured on an optical disk to record information; Optical head control means for detecting the tracking error signal when recording a video signal and driving the optical head, a spindle motor for rotating the optical disk, and identifying address information previously recorded on the track of the optical disk. Address information identifying means for identifying address information, and an analog / digital To Tal converted A /
D conversion means, storage means for temporarily storing and reading digital data A / D converted by the A / D conversion means, and conversion of the digital data connected to the optical head and read from the storage means A recording unit for recording through the optical head; and a system control unit for controlling the entire apparatus. Further, the number of quantization bits in the A / D conversion is changed according to the amount of digital data in the storage unit. An optical disc recording apparatus according to a tenth aspect of the present invention includes an optical head for accessing a track formed on an optical disc and recording information, and an optical head connected to the optical head for recording an audio signal. Optical head control means for detecting a tracking error signal during recording and driving the optical head, and a spindle for rotating the optical disk Data, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and A / D converting means for performing analog / digital conversion of an audio signal inputted at the time of recording. Storage means for temporarily storing and reading digital data A / D converted by the A / D conversion means, and the optical head connected to the optical head for converting the digital data read from the storage means Recording means for recording the data through the A / D converter, and means for changing the number of quantization bits in the A / D conversion according to the amount of digital data in the storage means. An optical disk recording apparatus according to an eleventh aspect of the present invention accesses a track formed on an optical disk to store information. An optical head for performing recording, an optical head control means connected to the optical head for detecting a tracking error signal during recording of an audio signal and driving the optical head, a spindle motor for rotating the optical disk, and the track of the optical disk Address information identifying means for identifying address information for identifying address information pre-recorded above; A / D converting means for performing analog / digital conversion of an audio signal inputted at the time of recording;
Storage means for temporarily storing and reading digital data A / D-converted by the D conversion means; and recording means connected to the optical head for converting the digital data read from the storage means and recording through the optical head Means, and a system control means for controlling the entire apparatus,
And means for changing the sampling frequency in the A / D conversion in accordance with the amount of digital data in the storage means.

[0008]

According to the present invention, even if the optical head goes out of track due to an external impact or the like, the present invention operates so that information can be continuously recorded on the optical disk without interruption.

Further, according to the present invention, with the above-described configuration, it is possible to save the capacity of the storage means and / or perform efficient continuous recording compensation.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an optical disk recording apparatus according to a first embodiment of the present invention. The optical disc 1 is rotating at a constant rotational speed of 3600 revolutions / minute, and records a video signal having an externally input field frequency of 60 Hz. Address information is preformatted in each sector on the optical disk, so that each sector can be recognized. The track for one round is divided into two sectors, and one field of data is recorded in one sector. That is, normally, one rotation is performed in 1/60 second, which is equivalent to one field (one sector), so that intermittent recording in which one sector is recorded in one rotation is performed. Here, an intermittent recording cycle 22 is defined. When the total number of sectors through which the optical head 4 passes in a unit time is S0 and the total number of sectors in which the optical head 4 actually performs recording in a unit time is S, the period 22 of intermittent recording is defined by S / S0. . Therefore, in the case of the present embodiment, the period 22 of the intermittent recording at the normal time is ２.

The input information 2 (video data) input from the outside passes through the storage means 8 and is input to the recording means 9.
The recording means 9 converts the read data 11 of the storage means 8 into a recording signal 12 driven by a semiconductor laser built in the optical head 4. The recording signal 12 output from the recording means 9 is sent to the optical head 4 and recorded on a predetermined sector on the optical disc 1. The address information identification means 6 recognizes the address information 16 (track number / sector number, etc.) of the sector in which the optical head 4 is located from the address reproduction signal 15 from the optical head 4. The optical head control means 5 controls the tracking and the write address of the optical head 4 so that the optical head 4 can record the recording signal 12 in a predetermined sector on the optical disk 1.

The recording control 3, ie, recording start time, recording time, recording start address, etc., is input to the system control means 10 from outside. Further, the system control means 10
The optical head control means 5 and the recording means 9 are controlled so as to be able to record on the optical disk 1 from the recording start address, and the video data 2 from the outside is usually supplied so that one field (one sector) can be intermittently recorded per rotation. Storage means 8 for one field
Is stored on the optical disk 1 when the data is stored in the optical disk 1. Further, the tracking error signal 14 detected by the optical head control means 5 and / or the address information 16 identified by the address information identification means 6 are monitored to detect the off-track.

When the track cannot be recorded on a predetermined track on the optical disk 1 due to a track deviation due to disturbance or the like, the recording operation of the recording means 9 and the digital data reading of the storage means 8 are immediately stopped, and the return operation to the predetermined track is performed. Start. The video data 2 input during the return operation is stored in the storage means 8. After the disturbance has subsided and the track has returned to the predetermined track, the recording is restarted from the beginning of the sector where the recording was stopped.
At this time, the storage data amount 2 stored in the storage unit 8
1 (Q) is detected, and when the value of Q is larger than the predetermined amount Qm,
That is, when Q> Qm, the intermittent recording cycle 22 is changed.
In the case of this embodiment, continuous recording in which two sectors are recorded in one rotation is performed. Thereafter, when the value of Q becomes equal to or less than Qm, that is, when Q ≦ Qm, the recording is returned to the intermittent recording in which the period of the normal period is ２, that is, the intermittent recording in which one sector is recorded in one rotation, and The recording of the video signal is continuously performed. In the present embodiment, the change of the intermittent recording cycle 22 is performed in sector units. Therefore, during the recording of data of a predetermined sector, Q ≦ Q
Even when the number of data in the sector reaches m, the intermittent recording cycle 22 is not changed until the data of the sector is completely recorded.

The time from when the track is lost to the point where recording cannot be performed on a predetermined track on the optical disk 1 until the disturbance is restored and the track returns to the predetermined track is defined as a track recovery time Tr. The worst one after returning to the truck
Since there are rotational delay revolution, it is possible to compensate for the continuous recording of time corresponding to the data amount of (total storage capacity -1 rotation -1 field storage means 8) C ₁ =. That as large than the amount of data C ₁ is stored in the storage means 8 in the time Tr may be continuously recorded without damaging the data even if it occurs off-track.

Further, by changing the intermittent recording cycle 22, the processing speed of the recording data is increased. Accordingly, the reading speed of the digital data stored in the storage means 8 is also increased, and the time required to secure the free space of the storage means 8 is reduced. In the case of the present embodiment, by changing the intermittent recording cycle 22 from 1/2 to 1, the reading speed of the storage means 8 is doubled, so that the time required to secure the free space is one half. I'm done.

In this embodiment, the optical disk 1
Is divided into two sectors.
Although one field of data is recorded in a sector and intermittent recording of one sector is normally performed in one rotation, the track format of the optical disc 1 and the period 22 of intermittent recording are not limited to this. For example, a track for one lap is 6
It is assumed that an optical disk divided into two sectors is used, and intermittent recording of one sector is normally performed in one rotation. In this case, if intermittent recording is performed for one rotation and five sectors after recovery from the off-track, the reading speed of the storage means 8 becomes five times. In the case of recording data with a constant input speed, if the intermittent recording period 22 is shortened, the rotation speed of the optical disc and the recording clock frequency must be increased accordingly. The larger the difference between the intermittent recording periods, the shorter the time required to secure free space.

FIG. 2 is a diagram showing a signal format on a sector of the optical disk 23 in the second embodiment of the present invention. In this embodiment, the physical length of each sector is constant for all sectors. An address information area 24 (SA) is provided at the beginning of each sector, and address information (track number / sector number, etc.) indicating a position on the optical disk 23 is preformatted in advance by a change in shape or the like. An LPC area 27 (LPC) is provided following the address information area 24,
A blank period for controlling the reproduction laser power is set, and no signal is recorded. LPC area 27 (LPC)
Subsequently, a mode recording area 25 is provided, and an information recording area 26 is further provided with a gap area 28 (GAP) interposed therebetween.
In the mode recording area 25, the information recording area 2 that follows
6, recording density information obtained by encoding a clock frequency for recording information at a constant clock frequency for each sector. In the information recording area 26, a video signal is recorded at a clock frequency corresponding to the recording density information recorded in the mode recording area 25. Further, a preamble 29 (Pre) is provided at the beginning of the information recording area 26, and a PLL of a clock is locked so that recorded information can be reliably reproduced even if the rotation of the optical disc 23 fluctuates during reproduction. The pattern signal for causing the recording is recorded. Gap area 28 (G) between mode recording area 25 and information recording area 26
AP) is a blank period for setting the recording / reproducing frequency, and no signal is recorded.

If the laser power can be controlled quickly, the LPC area 27 need not be provided. If the frequency of recording or reproduction can be changed quickly, the gap area 28 (GAP) and the preamble 29 (Pre) may not be provided.

FIG. 3 is a block diagram showing a configuration of an optical disk recording apparatus common to the second and third embodiments of the present invention. In the present embodiment, that is, in the second embodiment, the optical disk 23 is rotated by the spindle motor 32 at a constant linear speed regardless of the inner and outer circumferences. Therefore, assuming that all physical sector lengths of the optical disk 23 are constant, the number of bits (symbols) recorded in each sector is proportional to the recording clock frequency. In this embodiment, during normal recording, recording is performed with the recording clock frequency set to the value of Fu.
The field video data is divided into nine sectors and recorded. In FIG. 3, the optical head 4, the optical head control means 5, and the address information identification means 6 have exactly the same functions as those in the block diagram described in the first embodiment.

Input information 2 (video data) input from the outside is input to the recording means 33 through the storage means 8. The recording means 33 converts the digital data 11 from the storage means 8 into a recording signal 12 for driving a semiconductor laser incorporated in the optical head 4. The recording means 33 has a function of changing the recording clock frequency, and records recording density information obtained by encoding the recording clock frequency in the mode recording area 25 on each sector of the optical disc 23 at a constant frequency Fu. The recording mode setting signal 34 in FIG. 3 sets the recording clock frequency in this embodiment, that is, in the second embodiment.

To the system control means 10, a recording setting 3, that is, a recording start time, a recording time, a recording start address and the like are inputted from outside. Further, the system control means 10
Controls the head control means 5 and the recording means 33 so that video data of one field is normally divided into nine sectors from the recording start address and recorded. A tracking error signal 14 detected by the optical head control means 5;
And / or monitoring the address information 16 identified by the address information identifying means 6 to detect the off-track.

When the track cannot be recorded on a predetermined track on the optical disc 23 due to disturbance or the like due to disturbance or the like, the recording operation of the recording means 33 and the reading of digital data from the storage means 8 are immediately stopped, and the return operation to the predetermined track is performed. Start. The video data 2 input during the return operation is stored in the storage means 8.

After the disturbance has subsided and the track returns to the predetermined track, the recording is restarted from the beginning of the sector where the recording was stopped. At this time, the storage data amount 21 stored in the storage means 8
(Q) is detected, and when the value of Q is larger than the predetermined amount Qm, that is, when Q> Qm, the video signal is stored in the information recording area 26 at a frequency 1.5 Fu which is 1.5 times the recording clock frequency Fu in the normal state. Record Thereafter, when the value of Q becomes equal to or smaller than Qm, that is, when Q ≦ Qm, the recording clock frequency is returned to the normal recording clock frequency Fu, and the recording of the video signal in the information recording area 26 is continuously performed. In this embodiment, the change of the recording clock frequency is performed on a field basis. Therefore, even if Q ≦ Qm during the recording of the data of the predetermined field, the recording clock frequency is not changed until the recording of the data of the field is completed. However, when the recording clock frequency is Fu, one field of video data is divided into nine sectors and recorded, and when the recording clock frequency is 1.5 Fu, one field data is divided into six sectors and recorded.

As described above, since the optical disk 23 is rotating at a constant linear velocity, when the recording clock frequency 34 is multiplied by 1.5, the recording speed of video data becomes apparently 1.5.
Multiply by two. Therefore, the speed at which the digital data in the storage means 8 is read out becomes 1.5 times faster than when the recording clock frequency is not changed.

In this embodiment, when Q ≦ Qm, one field data is divided into nine sectors and recorded at the recording clock frequency Fu, and when Q> Qm, one field data is divided into six sectors. Although the recording was performed at the recording clock frequency of 1.5 Fu, the data division method and the recording clock frequency are not limited to this. If the product of the number of sectors for dividing data of one field and the recording clock frequency is always constant, it is possible to efficiently secure the free space of the storage means 8 without wasting the recording capacity of the optical disk. It is. For example, when Q ≦ Qm, data of one field is divided into 10 sectors and recorded at a recording frequency Fu, and when Q> Qm, data of one field is divided into 5 sectors and recorded at a recording clock frequency of 2Fu. Good.
In this case, the speed of reading the digital data from the storage means 8 is doubled.

FIG. 4 is a diagram showing a signal format on a sector of the optical disk 31 in the third embodiment of the present invention. As in the optical disc 23 of the second embodiment, the physical length of each sector is constant for all sectors. An address information area 24 (SA) is provided at the head of each sector, and address information (track number / sector number, etc.) indicating a position on the optical disk 31 is preformatted in advance by a change in shape or the like. Following the address information area 24, the LPC area 27
(LPC) is provided, and a blank period for controlling the recording / reproducing laser power is set, and no signal is recorded. L
A mode recording area 30 is provided following the PC area 27 (LPC), and an information recording area 26 is further provided with a gap area 28 (GAP) interposed therebetween. In the mode recording area 30, modulation code identification information obtained by encoding the type of the recording modulation code used when information is recorded in the information recording area 26 that follows is recorded at a constant recording clock frequency for each sector and at a predetermined frequency. The data is modulated by the recording modulation code and recorded. In the information recording area 26, video data is modulated by a recording modulation code of a type corresponding to the modulation code identification information recorded in the mode recording area 30 and recorded. The preamble 29 is located at the beginning of the information recording area.
(Pre) is provided, and a pattern signal for locking the clock PLL is recorded so that the recorded information can be reliably reproduced even if the rotation of the optical disc 31 fluctuates during reproduction. A gap area 28 (GAP) between the mode recording area 30 and the information recording area 26 is used as a blank period for setting the recording / reproducing frequency and switching the modulation method at the time of recording and switching the demodulation method at the time of reproduction. Is not recorded.

If the laser power can be controlled quickly, the LPC area 27 may not be provided. In addition, if the recording / reproducing frequency and the modulation / method can be switched quickly, the gap area 28
(GAP) and the preamble 29 (Pre) may be omitted.

As described above, the configuration of the optical disk recording apparatus of the second embodiment is the same as the configuration of the optical disk recording apparatus of the third embodiment, as shown in FIG. Only the functions differ from the second embodiment. In the present embodiment, that is, in the third embodiment, the optical disk 31 is rotated by the spindle motor 32 at a constant linear speed regardless of the inner and outer circumferences. Therefore, if all physical sector lengths of the optical disk 31 are made constant and the recording clock frequency is also made constant, the number of bits (symbols) recorded in each sector becomes completely constant regardless of the inner and outer circumferences.

At the time of normal recording, the digitized video data is transferred to the (1,7) run-lens limiter code (RLLC).
To perform mark edge recording. In addition, one field of video data is divided into nine sectors and recorded.

The recording means 33 has a function of changing the recording modulation code, and stores the modulation code identification information, which encodes the type of the recording modulation code, in the mode recording area 31 on each sector of the optical disc 31 by a predetermined recording modulation code. Modulate with a code and record.
In this embodiment, that is, in the third embodiment, the recording mode setting signal 34 sets the type of the recording modulation code.

If the track cannot be recorded on a predetermined track on the optical disk 31 due to a track deviation due to disturbance or the like, the recording operation of the recording means 33 and the digital data reading of the storage means 8 are immediately stopped, and the operation of returning to the predetermined track is performed. Start. The video data 2 input during the return operation is stored in the storage means 8. After the disturbance has subsided and the track has returned to the predetermined track, the recording is restarted from the beginning of the sector where the recording was stopped. At this time, the storage data amount 21 (Q) stored in the storage means 8 is detected, and when the value of Q is larger than the predetermined amount Qm, that is, when Q> Qm, the recording modulation code is changed to (1). ,
7) Switch from RLLC to (2, 7) RLLC in an emergency to perform modulation and perform mark edge recording.

Here, the (1,7) RLLC is a method of converting a binary data sequence of 2i bits (i = 1, 2) into a recording code sequence of 3i bits, and is shown in the table of FIG. Perform such a conversion. As is clear from the table, (1,
7) The code sequence modulated by the RLLC has a bit “1”.
Are not continuous, and the number of bits “0” between the bit “1” and the next bit “1” is limited to seven or less. The (2,7) RLLC is a method of converting a j-bit (j = 2, 3, 4) binary data sequence into a 2j-bit recording code sequence, and performs conversion as shown in FIG. Do. As is clear from the table, (2,
7) The code sequence modulated by the RLLC has a bit “1”.
The number of bits "0" between the next bit "1" and the next bit "1" is a series limited to two or more and seven or less. Mark edge recording is a method of recording a waveform sequence in which the state of a mark is inverted only when the bit information is either 1 or 0 of a recording code sequence. FIG. 5C shows an example of mark edge recording. In particular, inverting the state of a mark only when the bit is "1" is referred to as non-return-to-zero inverting (NRZI). Generally, it is known that a combination of (1,7) RLLC and mark edge recording or (2,7) RLLC and mark edge recording provides a recording method suitable for high-density recording.

The parameters relating to the recording density will be described, and the relationship with each recording modulation code will be described. Let T be the interval between each bit of the binary data sequence before modulation, and let Tmin be the minimum inversion interval indicating the length of the minimum mark recorded on the optical disc. When the code sequence modulated by (1, 7) RLLC is converted to NRZI, the length of the mark or space becomes bit “0” between two bits “1”.
Is minimum when the number is 1, and as shown in FIG. 5D, the Tmin of the (1,7) RLLC is represented by 4/3 × T. Similarly, as shown in FIG.
Tmin of LLC is represented by 3/2 × T. The value obtained by dividing the minimum inversion interval Tmin by the bit interval T is the recording density ratio Dr.
Then, (1, 7) RLLC becomes Dr = 4/3, and
(2,7) RLLC becomes Dr = 3/2. Where T
Since min represents the length of the minimum mark, the limit of reducing Tmin is naturally determined from the wavelength of the semiconductor laser, the performance of the optical head, and the characteristics of the optical disk medium.
The recording density ratio Dr indicates how many bits of information are included in the minimum mark length. Therefore, assuming that the values of the track pitch and Tmin are equal, it is possible to compare the recording densities when each recording modulation code is used by comparing the values of Dr. That is, when the value of Tmin is determined, (2/2) RLLC becomes 9 of (1, 7) RLLC according to (3/2) ÷ (4/3) = 9/8.
It is possible to obtain a recording density of / 8 times.

After the recording is resumed, when the value of Q becomes equal to or less than Qm, that is, when Q ≦ Qm, the normal (1,7)
Returning to the RLLC, the recording of the video signal in the information recording area 26 is continuously performed. In this embodiment, the switching of the recording modulation code is performed on a field basis. Therefore, even if Q ≦ Qm during the recording of the data of the predetermined field, the recording modulation code is not switched until the recording of the data of the field is completed. However, when modulated by (1,7) RLLC, one field of video data is divided into nine sectors and recorded, and when modulated by (2,7) RLLC, one field of data is divided into eight sectors. Record.

As described above, since the optical disk 31 is rotating at a constant linear velocity, when the (1,7) RLLC is switched to the (2,7) RLLC, the recording speed of the video data is clearly 9/8. Multiply by two. Therefore, the speed at which the digital data in the storage means 8 is read out is 9/8 times faster than when the recording modulation code is not changed.

In this embodiment, when Q ≦ Qm, the data of one field is divided into nine sectors and (1,7) RLL
When Q> Qm, the data of one field is divided into eight sectors and recorded by modulating with (2,7) RLLC. The data dividing method and the type of recording modulation code are as follows. However, the present invention is not limited to this. If the product of the number of sectors for dividing data of one field and the recording density ratio Dr is always constant, there is an effect similar to that of the present embodiment, that is, an effect that the free space of the storage means 8 can be efficiently secured. .

FIG. 6 is a diagram showing the movement of the optical disk 35 and the optical head during the recording operation in the fourth embodiment of the present invention. The optical disk 35 is an MCAV (Modified CAV) type optical disk having tracks on both sides as shown in FIG. 6 (a), and both sides have an emergency recording area 36 on the outer peripheral side and a normal recording area 37 on the inner peripheral side. It is divided into two areas. The MCAV method is an improvement of the CAV method that always keeps the rotation speed of the optical disk constant. The rotation speed of the optical disk is kept constant, the recording area is divided into a plurality of areas called zones in the radial direction of the disk, and the recording clock is changed. This is a recording method in which the frequency is changed for each zone, and the recording mark length on the outer peripheral side and that on the inner peripheral side are substantially equal by increasing the frequency toward the outer periphery.

On the optical disk 35, the normal recording area 37 on the upper surface and the lower surface is divided into eight zones in the radial direction.
Call. Further, the emergency recording area 36 on the upper surface and the lower surface is divided into two zones in the radial direction. A track for one round of a total of four areas, two normal recording areas 37 and two emergency recording areas 36, is divided into six sectors 38, and address information is preformatted in each sector. Each sector can be recognized.

FIG. 7 is a block diagram showing a configuration of an optical disk recording apparatus according to a fourth embodiment of the present invention. The first optical head 39 and the second optical head 40 access the tracks on the lower surface and the upper surface of the optical disk 35 and record signals. The optical disc 35 is rotated at a constant rotation speed of 1800 rpm by a spindle motor 41.
A video signal having a field frequency of 60 Hz input from the outside is recorded.

The input information 2 (video data) input from the outside is temporarily stored in the storage means 8. The digital data 11 read from the storage means is transmitted to the distribution means 42.
Are divided into two and input to the two first recording means 43 and the second recording means 44. The first recording means 43
Of the first digital data 4
5 is converted into a first recording signal 46 for driving a semiconductor laser incorporated in the first optical head 39. The second recording means 44 is connected to the second optical head 40, and converts the second digital data 47 into a second recording signal 48 for driving a semiconductor laser built in the second optical head 40. The first recording signal 46 and the second recording signal 48 are sent to the first optical head 39 and the second optical head 40, respectively, and are recorded in predetermined sectors on the lower surface and the upper surface of the optical disk 35, respectively. The address information identifying means 6 recognizes first address information 50 (track number / sector number, etc.) of a sector in which the first optical head 39 is located from a first address reproduction signal 49 from the first optical head 39. The second address information 52 (track number / sector number, etc.) of the sector where the second optical head 40 is located is recognized from the second address reproduction signal 51 from the second optical head 40. The optical head controller 5 controls the first optical head 39 and the second optical head 40 to record the first recording signal 46 and the second recording signal 48 in predetermined sectors on the optical disc 35, respectively.
The tracking and writing addresses of the first optical head 39 and the second optical head 40 are controlled.

The system control means 10 receives a recording setting 3 from outside, that is, a recording start time, a recording time, a recording start address, and the like. Also, the system control means 10
Controls the optical head control unit 5, the first recording unit 43, and the second recording unit 44 so that recording can be performed on the optical disk 35 from the recording start address. The first tracking error signal 54 detected by the optical head control means 5
And / or the first address information 50 identified by the address information identifying means 6 to detect the off-track of the first optical head 39. Further, by monitoring the second tracking error signal 56 detected by the optical head control means 5 and / or the second address information 52 identified by the address information identifying means 6, the second optical signal is monitored. The off-track of the head 40 is detected.

Here, no off-track has occurred, and the storage data amount 21 stored in the storage means 8 has not been changed.
When (Q) is equal to or less than the predetermined amount Qm, that is, when Q> Qm, it is referred to as normal time. Conversely, when Q ≦ Qm, it is called an emergency. In this embodiment, the normal recording area 36 of the optical disc 35 is normally used.
The signal is recorded in the sector No. 3, and in the emergency, the emergency recording area 3
A signal is recorded in sector 6.

The normal recording method will be described. FIG.
As shown in (a), the normal movement of the optical head is as indicated by a solid arrow. That is, the first optical head 39 moves the normal recording area 37 on the lower surface of the optical disk 35 from the outer peripheral side toward the inner peripheral side, and the second optical head 40 moves
Is moved from the inner peripheral side to the outer peripheral side in the normal recording area 37 on the upper surface of the recording medium. Here, assuming that the data amount recorded in one sector of zones 1 to 8 is Q1 to Q8, the recording clock frequency is set so that the following relational expression is satisfied.

Q1 + Q8 = Q2 + Q7 = Q3 + Q6 = Q
4 + Q5 = M (constant) Further, as shown in FIG. 6B, when the first optical head 39 accesses the N zone (N is an integer from 1 to 8), the second optical head 40 -N) Move the two heads to access the zone. By doing so, it is possible to perform recording at a constant recording rate in normal times, that is, in such a manner that the amount of data to be recorded per unit time is always constant with the first optical head 39 and the second optical head 40 together. Becomes possible. Normally, two fields of video data are recorded in one rotation. Since the first optical head 39 and the second optical head each access six sectors during one rotation, the first optical head 39 has three sectors and the second optical head 40 has three sectors during half rotation. , One field of video data is recorded in a total of six sectors.
Here, the amount of video data in one field is set to be 3M.

In an emergency, that is, when a track is lost due to disturbance or the like and it becomes impossible to record on a predetermined track on the optical disk 35, the recording operation of the first recording means 43 and the second recording means 44 is immediately stopped. The reading of the digital data from the storage means is stopped, and the first optical head 39 and the second optical head 39 are stopped.
The optical head 40 starts a track return operation. At this time, the system control means stores the address of the sector in which the off-track occurred. The video data 2 input during the return operation is stored in the storage means 8. As shown in the dotted arrow in FIG. 6A and the correspondence table in FIG. 6B, the first optical head 39 and the second optical head 40 are moved to the emergency recording area 36, respectively, and the Recording area 36
Recording is restarted in the sector within.

An emergency recording method will be described. First
The optical head 39 starts recording from the outermost track of the zone 10 and gradually proceeds to the inner peripheral side. on the other hand,
The second optical head 40 starts recording from the innermost track of the zone 9 and gradually proceeds to the outer peripheral side. The data amount recorded in one sector of zones 9 and 10 is Q9,
Assuming Q10, the recording clock frequency is set so that the following relational expression holds.

Q9 + Q10 = 1.5M Therefore, the recording rate in an emergency is 1.5 times that in a normal state, that is, the amount of data recorded in a unit time in an emergency is 1.
That is, five times. Since the number of rotations of the optical disk 35 is always constant, two fields of video data are normally recorded during one rotation, but three fields of video data can be recorded in an emergency. Since one round of the track is divided into 6 sectors, a total of 4 sectors of 2 sectors accessed by the first optical head 39 and 2 sectors accessed by the second optical head 40 during 1/3 rotation. One field of video data is recorded in the sector. In the case of the present embodiment, the recording speed is increased 1.5 times by switching from the normal recording to the emergency recording, so that the read speed of the storage unit 8 is also increased 1.5 times. Therefore, the time required to secure the free space of the storage means 8 is only 2/3 of the time.

After the emergency recording is started, when the value of Q becomes equal to or less than the predetermined amount Qm, that is, when Q ≦ Qm, the recording in the emergency recording area 36 is stopped and the storage means is temporarily stored. Is also stopped, the first optical head 39 and the second optical head 40 are returned to the track where the off-track occurred immediately before, and the recording is restarted. The recording method at this time is the same as the normal recording method described above. In the case of this embodiment, the switching of the recording method from normal to emergency and from emergency to normal is performed in units of rotation. For example, the start sector of one track is determined in advance, and when an off-track occurs or an empty area is secured until Q ≦ Qm, recording is restarted from the start sector of one track. To In other words, even when the off-track occurs, even if the sector is in the middle of one track, the recording is restarted from the data already recorded in the start sector of the circumference. Also, when Q ≦ Qm, even if the sector is in the middle of one round, the recording is continued up to the last sector of the round before returning to the normal recording area 37. Further, with the switching of the recording method, the digital data division of the distribution unit 42 and the first recording unit 43 and the second recording unit 44 are performed.
Recording mode settings (recording clock frequency, etc.) must be changed. The distribution mode setting signal 65 and the recording mode setting signals 63 and 64 are used for this purpose. In this embodiment, the zone number is given from the system control means 10.

The address of the sector immediately before returning to the normal recording area 37 is also stored in the system control means 10, and from the second and subsequent off-tracks, the address of the sector address stored in the system control means 10 is stored. Emergency recording should start at the next address.

In this manner, the optical head is moved to the emergency recording area 36 every time an off-track occurs, and recording is performed at a higher speed than in the normal state. Recording can be performed.

The emergency recording area 36 can also be used during normal recording. That is, if all the sectors in the normal recording area 37 have already been recorded and no unrecorded area remains, and if there is still an unrecorded area in the emergency recording area 36, no off-track has occurred. The recording is continued in the emergency recording area 36. By doing so, all the areas of the optical disk 35 can be used without wasting.

Although the double-sided MCAV optical disk is recorded by two optical heads in this embodiment, the format of the optical disk and the number of optical heads are not limited to these. That is, for example, the one-sided optical disk is rotated at a constant rotation speed, the sector length and the recording clock frequency are set so that the amount of data recorded in one sector of the normal recording area 37 is always constant, and emergency recording is performed. The same effect can be obtained by setting the amount of data recorded in one sector of the area 36 to be larger than that in normal time.

As a method of increasing the data amount in the sector of the emergency recording area 36 to be larger than the data amount in the sector of the normal recording area 37, the information recording area 26 in the sector is further shown in FIG. As shown, there is a method of dividing into a plurality of sync blocks 66 and making the number of sync blocks 66 in a sector of the emergency recording area 36 larger than the number of sync blocks 66 in a sector of the normal recording area 37. By doing so, there is an effect that the division processing of the digital data 11 by the distribution means 42 can be easily performed.

FIG. 8A is a block diagram showing a configuration of an optical disk recording apparatus according to a fifth embodiment of the present invention.
The components other than the history information storage means 67 in the block diagram have exactly the same functions as those in the fourth embodiment shown in FIG. The added function of the history information storage means 67 is to move to the emergency recording area 36 due to the off-track, and to the destination sector when returning to the normal recording area 37 when Q ≦ Qm. The history information storage means 67 stores the movement destination sector as the track jump history information 68 during the recording of a series of video data. After a series of recording is completed, the track jump history information 69 read from the history information storage means 67 is recorded in the history information recording area 71 provided on the optical disk 70.

At the start of reproduction, the history information recording area 71 on the optical disk 70 is accessed first, and the track jump history information is reproduced in advance, so that the track jump processing during reproduction can be performed smoothly.

In this embodiment, the history information recording area 71 is collectively provided on the outermost track of the optical disk 70 as shown in FIG.
The position of 1 is not limited to this. For example, it may be provided collectively on the innermost track, or a history information recording area 71 may be provided in each sector of the emergency recording area 36 and the normal recording area 37. In this case, it is necessary to record the history information simultaneously while recording the video data, not after the end of the recording of a series of video data.On the contrary, it is not necessary to collectively reproduce the history information in advance at the start of the reproduction,
The track jump processing can be sequentially performed while reproducing the signal.

FIG. 9 is a block diagram showing a configuration of an optical disk recording apparatus according to the sixth embodiment of the present invention. In FIG. 9, the optical head 4, the optical head control means 5, and the address information identification means 6 have exactly the same functions as those in the block diagram described in the first embodiment.

In this embodiment, that is, in the sixth embodiment, a signal obtained by digitally compressing a video signal having a field frequency of 60 Hz is recorded for one field per sector. The video signal input from the outside is digitally compressed and encoded by the information compression means 72. The information compression means 72 has a function of changing the compression rate of digital compression. The input transfer speed of the input video data 2 to the information compression means 72 is R
Assuming that i is the transfer rate of the digital data 75 after the compression and encoding, Ro is the compression rate here represented by Ro / Ri. In the case of this embodiment, during normal recording, the video data 2 is compression-coded at a constant compression rate rc. The storage means 8 temporarily stores the compressed digital data 75. The recording means 73 converts the digital data 11 read from the storage means 8 into a recording signal 12 for driving a semiconductor laser incorporated in the optical head 4 and records the signal in a predetermined sector on the optical disk 1 through the optical head 4. .

The recording control 3, that is, recording start time, recording time, recording start address, and the like are input to the system control means 10 from outside. Further, the system control means 10
Controls the optical head control means 5 and the recording means 73 so that video data of one field from the recording start address can be recorded in one sector. Further, the tracking error signal 14 detected by the optical head control means 5 and / or the address information 16 identified by the address information identification means 6.
Are monitored to detect the off-track.

When recording on a predetermined track on the optical disk 1 cannot be performed due to a track deviation due to disturbance or the like, the recording operation of the recording means 73 and the reading of digital data from the storage means 8 are immediately stopped, and the returning operation to the predetermined track is performed. Start. The video data input during the return operation is compressed by the information compression means and then stored in the storage means 8. At this time, the storage data amount 21 (Q) stored in the storage means 8 is detected, and when the value of Q exceeds a predetermined amount Qm, that is, when Q> Qm, the compression ratio is increased to twice the normal time. 2
The input video data is compressed by rc.

After the disturbance has subsided and the track has returned to the predetermined track, the reading of the storage means 8 is restarted, and the recording is restarted from the beginning of the sector where the recording was stopped. Thereafter, when the value of Q becomes equal to or less than Qm, that is, when Q ≦ Qm, the normal compression ratio rc
And the compression process is continued. In this embodiment, the system control means 10 sends a compression rate setting signal 76 to the information compression means 75.
To change the compression ratio, and the change in the compression ratio is performed on a field-by-field basis.

As described above, the data storage capacity of the storage means 8 can be apparently increased by changing the compression ratio. In the case of this embodiment, the compression ratio is changed from rc to 2
By changing to rc, the free space is apparently doubled.

FIG. 10 is a block diagram showing a configuration of an optical disk recording apparatus according to a seventh embodiment of the present invention. The configuration of the optical disk recording device of the seventh embodiment is almost the same as the configuration of the optical disk recording device of the sixth embodiment, except for the method of changing the compression ratio. In this embodiment, that is, in the seventh embodiment,
A signal obtained by digitally compressing a video signal having a field frequency of 60 Hz is recorded for one field per sector. The video signal 2 input from the outside is digitally compressed and encoded by the information compression means 72. The information compression means 7
Reference numeral 2 has a function of changing the compression ratio of digital compression.
In the case of this embodiment, during normal recording, video data is compression-coded at a constant compression rate rc. The storage means 8 temporarily stores the compressed digital data 78. Recording means 7
3 is digital data 11 read from the storage means 8
Is converted into a recording signal 12 for driving a semiconductor laser incorporated in the optical head 4, and is recorded in a predetermined sector on the optical disk 1 through the optical head 4.

The system control means 10 receives a recording setting 3, ie, a recording start time, a recording time, a recording start address, etc., from outside. Further, the system control means 10
Controls the optical head control means 5 and the recording means 73 so that video data of one field from the recording start address can be recorded in one sector. Further, the tracking error signal 14 detected by the optical head control means 5 and / or the address information 16 identified by the address information identification means 6.
Are monitored to detect the off-track.

If the track cannot be recorded on a predetermined track on the optical disc due to disturbance or the like due to disturbance or the like, the recording operation of the recording means 73 and the digital data reading of the storage means 8 are immediately stopped, and the return operation to the predetermined track is started. I do. The video data 2 input during the return operation is compressed by the information compression means 72 and then stored in the storage means 8. At this time, the input video data is compressed at a compression rate of 4 rc, which is four times the normal rate, with respect to the video data in a period of a predetermined number of fields f from the field input at the moment when the off-track is detected. In this embodiment, the system control means 10 sends a compression mode setting signal 77 to the information compression means 73.
The compression rate is changed by inputting (compression rate / field number f).

After the end of the period of the predetermined number of fields f, the compression rate rc is returned to the normal compression rate and the compression processing is continued. After the disturbance has subsided and the track has returned to the predetermined track, the reading of the storage means 8 is restarted, and the recording is restarted from the beginning of the sector where the recording was stopped.

As described above, the data storage capacity of the storage means 8 can be apparently increased by changing the compression ratio. In the case of the present embodiment, the compression ratio is changed from rc to 4
By changing to rc, the amount of digital data in the changed section is reduced to 1/4 of the normal time, so that the storage capacity can be saved.

FIG. 11 is a block diagram showing the configuration of an optical disk recording apparatus according to the eighth embodiment of the present invention. FIG.
In 1, the optical head 4, the optical head control means 5, and the address information identification means 6 have exactly the same functions as those in the block diagram described in the first embodiment.

In this embodiment, that is, in the eighth embodiment, a signal obtained by adding an error correction code to a video signal having a field frequency of 60 Hz is recorded for one field per sector. The video signal 2 input from the outside is converted into ECC encoding means 7
9 for error correction coding. Further, the ECC encoding means 79 has a function of changing the type of the error correction code. In the case of the present embodiment, the video data 2 is GF (2 ⁸ ) Reed-Solomon product encoded as shown in FIG. At the time of normal recording, 8 bytes are used for the m-byte data as the outer code.
A (m + 8, m) code to which a byte parity byte is added is used, and an (n + 8, n) code to which an 8-byte parity byte is added to n-byte data is used as an inner code. At this time, the coding rate re0 is re0 = (m × n) / ((m + 8) × (n +
8)) Here, the generation unit of the product code is one field, that is, m × n bytes are video data for one field.

The storage means 8 temporarily stores the digital data 80 subjected to the error correction coding. The recording means converts the digital data 11 read from the storage means 8 into a recording signal 1 for driving a semiconductor laser incorporated in the optical head 4.
2 and is recorded in a predetermined sector on the optical disk 1 through the optical head 4.

The recording control 3, that is, recording start time, recording time, recording start address, and the like are input from the outside to the system control means 10. Further, the system control means 10
Controls the optical head control means 5 and the recording means 73 so that video data of one field from the recording start address can be recorded in one sector. Further, the tracking error signal 14 detected by the optical head control means 5 and / or the address information 16 identified by the address information identification means 6.
Are monitored to detect the off-track.

When the track cannot be recorded on a predetermined track on the optical disk 1 due to a track deviation due to disturbance or the like, the recording operation of the recording means 73 and the digital data reading of the storage means 8 are immediately stopped, and the operation of returning to the predetermined track is resumed. Start. The video data 2 input during the return operation is EC
After being subjected to error correction coding by the C encoding means 79, it is stored in the storage means 8. At this time, the storage data amount 21 (Q) stored in the storage means 8 is detected, and when the value of Q exceeds a predetermined amount Qm, that is, when Q> Qm, the type of the error correction code is changed to an emergency. Change to sign. In this embodiment,
An (m + 4, m) code in which 4-byte parity bytes are added to m-byte data is used as an outer code, and a 4-byte parity byte is added to n-byte data (n + 4, n) as an inner code. ) Sign is used. At this time, the coding rate re1 is as follows: re1 = (m × n) / ((m + 4) × (n + 4)) Here, the generation unit of the product code is one field, that is, m × n bytes are video data for one field.

After the disturbance has subsided and the track has returned to the predetermined track, the reading of the storage means 8 is restarted, and the recording is restarted from the beginning of the sector where the recording was stopped. Thereafter, when the value of Q becomes equal to or less than Qm, that is, when Q ≦ Qm, the error correction code is returned to the normal error correction code, and the encoding process is continued. In this embodiment, the system control means 10 changes the type of the error correction code by using the ECC.
This is performed by inputting the code mode setting signal 81 to the encoding means 79, and the change is performed on a field basis.

As described above, the data storage capacity of the storage means 8 can be apparently increased by changing the type of the error correction code. In the case of the present embodiment, the coding rate re1 of the emergency code and the coding rate re of the normal code
From the relationship of 0, the data amount per field in the section in which the sign is changed is re0 / re1, where re0 / re1 = ((m + 4) × (n + 4)) /
((M + 8) × (n + 8)) As a result, by changing the type of the error correction code, the free space becomes apparently (re1 / re0) times.

FIG. 12 is a block diagram showing the configuration of the optical disk recording apparatus according to the ninth embodiment of the present invention. FIG.
In 2, the optical head 4, the optical head control means 5, and the address information identification means 6 have exactly the same functions as those in the block diagram described in the first embodiment.

In this embodiment, that is, in the ninth embodiment, a digitized video signal having a field frequency of 60 Hz is recorded for one field per sector. A video signal 83 input as an analog signal from the outside is converted into a digital signal 84 by A / D conversion means 82. A
The / D converter 82 has a function of changing the number of quantization bits. In the case of the present embodiment, the video signal 83 is quantized by 10 bits during normal recording. The storage means 8 temporarily stores the A / D converted digital data 84. The recording means 73 converts the digital data 11 read from the storage means 8 into a recording signal 12 for driving a semiconductor laser incorporated in the optical head 4 and records the signal in a predetermined sector on the optical disk 1 through the optical head 4. .

The system control means 10 receives a recording setting 3 from outside, that is, a recording start time, a recording time, a recording start address, and the like. Further, the system control means 10
Controls the optical head control means 5 and the recording means 73 so that video data of one field from the recording start address can be recorded in one sector. Further, the tracking error signal 14 detected by the optical head control means 5 and / or the address information 16 identified by the address information identification means 6.
Are monitored to detect the off-track.

When the track cannot be recorded on a predetermined track on the optical disk 1 due to a track deviation due to disturbance or the like, the recording operation of the recording means 73 and the digital data reading of the storage means 8 are immediately stopped, and the operation of returning to the predetermined track is performed. Start. The video signal 83 input during the return operation is A /
After being A / D converted by the D conversion means 82, it is stored in the storage means 8. At this time, the storage data amount 21 (Q) stored in the storage means 8 is detected, and when the value of Q exceeds a predetermined amount Qm, that is, when Q> Qm, the quantization bit number of A / D conversion Is changed to 8 bits and the conversion process is performed.

After the disturbance has subsided and the track has returned to the predetermined track, the reading of the storage means 8 is restarted, and the recording is restarted from the beginning of the sector where the recording was stopped. Thereafter, when the value of Q becomes equal to or less than Qm, that is, when Q ≦ Qm, the number of quantization bits is returned to the normal 10 bits, and the A / D conversion process is continued.
In the present embodiment, the number of quantization bits is changed on a field-by-field basis, and the system controller 10 controls the A / D converter 82
Is input by inputting a quantization bit setting signal 85.

As described above, by changing the number of quantization bits for A / D conversion, the data storage capacity of the storage means 8 can be apparently increased. In the case of this embodiment, by changing the number of quantization bits from 10 bits to 8 bits, the free space is apparently increased by a factor of 1.25.

FIG. 13 is a block diagram showing the configuration of an optical disk recording apparatus according to the tenth embodiment of the present invention. FIG.
The block diagram of FIG. 3 is the same as the block diagram of the ninth embodiment shown in FIG. 12 except for the A / D conversion means and the input target. That is, the tenth embodiment is an example of an optical disk recording apparatus that handles an analog audio signal 87 as an input target and records an audio signal. Therefore, the A / D converter 86 converts the analog audio signal 87 into a digital signal.

In the present embodiment, that is, in the tenth embodiment, an audio signal 87 input as an analog signal from the outside is converted by an A / D converter 86 into a digital signal 88 having a sampling frequency of 48 kHz. A / D conversion means 86
Has a function of changing the number of quantization bits. In the case of this embodiment, during normal recording, the audio signal is quantized by 20 bits. The storage unit 8 temporarily stores the A / D converted digital data 88. Recording means 73 is storage means 8
The digital data 11 read from the optical head 4 is converted into a recording signal 12 for driving a semiconductor laser incorporated in the optical head 4, and is recorded in a predetermined sector on the optical disk 1 through the optical head 4. In this embodiment, data corresponding to an audio signal of a fixed number of samples, for example, 800 samples is recorded in one sector.

The recording control 3, that is, recording start time, recording time, recording start address, and the like are input from the outside to the system control means 10. Further, the system control means 10
Controls the optical head control means 5 and the recording means 73 so that a fixed number of samples of audio data from the recording start address can be recorded in one sector. Further, the tracking error signal 14 detected by the optical head control means 5 and / or the address information 1 identified by the address information identification means 6
6 to detect the off-track.

When the track cannot be recorded on a predetermined track on the optical disk 1 due to a track deviation due to disturbance or the like, the recording operation of the recording means 73 and the digital data reading of the storage means 8 are immediately stopped, and the operation of returning to the predetermined track is performed. Start. The audio signal 87 input during the return operation is A /
After being A / D converted by the D conversion means 86, it is stored in the storage means 8. At this time, the storage data amount 21 (Q) stored in the storage means 8 is detected, and when the value of Q exceeds a predetermined amount Qm, that is, when Q> Qm, the quantization bit number of A / D conversion Is changed to 16 bits and the conversion process is performed.

After the disturbance has subsided and the track has returned to the predetermined track, the reading of the storage means 8 is restarted, and the recording is restarted from the beginning of the sector where the recording was stopped. Thereafter, when the value of Q becomes equal to or less than Qm, that is, when Q ≦ Qm, the number of quantization bits is returned to the normal 20 bits, and the A / D conversion processing is continued.
In the present embodiment, the number of quantization bits is changed every fixed number of samples, for example, in units of 800 samples. The system control unit 10 inputs the quantization bit setting signal 89 to the A / D conversion unit 86. .

As described above, the data storage capacity of the storage means 8 can be apparently increased by changing the number of quantization bits for A / D conversion. In the case of the present embodiment, by changing the number of quantization bits from 20 bits to 16 bits, the free space apparently increases by a factor of 1.25.

FIG. 14 is a block diagram showing the configuration of an optical disk recording apparatus according to the eleventh embodiment of the present invention. The configuration of the optical disk recording device of the eleventh embodiment is almost the same as the configuration of the optical disk recording device of the tenth embodiment, but the A / D
The function of the conversion means is different. In this embodiment, that is, in the eleventh embodiment, the audio signal 87 input as an analog signal from the outside has a quantization bit number of 1 by the A / D conversion means 90.
It is converted into a 6-bit digital signal 91. The A / D converter 90 has a function of changing the sampling frequency. In the case of the present embodiment, during normal recording, the audio signal 87 is sampled at a sampling frequency of 48 kHz. The storage means 8 stores the A / D converted digital data 9
1 is temporarily stored. The recording means 73 converts the digital data 11 read from the storage means 8 into a recording signal 12 for driving a semiconductor laser incorporated in the optical head 4 and records the signal in a predetermined sector on the optical disk 1 through the optical head 4. . In this embodiment, data corresponding to an audio signal of a fixed number of samples, for example, 800 samples is recorded in one sector.

The system control means 10 receives a recording setting 3 from outside, that is, a recording start time, a recording time, a recording start address, and the like. Further, the system control means 10
Controls the optical head control means 5 and the recording means 73 so that a fixed number of samples of audio data from the recording start address can be recorded in one sector. Further, the tracking error signal 14 detected by the optical head control means 5 and / or the address information 1 identified by the address information identification means 6
6 to detect the off-track.

If the track cannot be recorded on a predetermined track on the optical disk 1 due to a track deviation due to disturbance or the like, the recording operation of the recording means 73 and the digital data reading of the storage means 8 are immediately stopped, and the operation of returning to the predetermined track is performed. Start. The audio signal 87 input during the return operation is A /
After being A / D converted by the D conversion means 90, it is stored in the storage means 8. At this time, the storage data amount 21 (Q) stored in the storage means 8 is detected, and when the value of Q exceeds a predetermined amount Qm, that is, when Q> Qm, the sampling frequency of the A / D conversion is set to 32 kHz. And perform the conversion process.

After the disturbance has subsided and the track has returned to a predetermined track, the reading of the storage means 8 is restarted, and the recording is restarted from the beginning of the sector where the recording was stopped. Thereafter, when the value of Q becomes equal to or less than Qm, that is, when Q ≦ Qm, the sampling frequency is returned to the normal 48 kHz, and the A / D conversion processing is continued. In the present embodiment, the number of quantization bits is changed every fixed number of samples, for example, in units of 800 samples.

As described above, by changing the sampling frequency of the A / D conversion, the data storage capacity of the storage means 8 can be apparently increased. In the case of this embodiment, the sampling frequency is changed from 48 kHz to 32 kHz.
, The free space is apparently increased by a factor of 1.5.

[0093]

As described above, the present invention has the following advantages. (1) Even if an optical head goes out of track due to an external impact or the like, the input data is temporarily stored in the storage means so that it can be stored on the optical disk. It is possible to realize continuous recording compensation for recording information continuously without interruption.

Furthermore, when the free space in the storage means becomes insufficient, (2) the data storage capacity in the storage means is increased apparently by reducing the amount of data to be recorded later, or (3) By increasing the data recording speed and increasing the data reading speed of the storage means, the time required for securing the data storage capacity in the storage means is shortened. By using the means, more efficient continuous recording compensation can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disk recording device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a signal format on a sector of an optical disc in a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an optical disk recording device common to a second embodiment and a third embodiment of the present invention;

FIG. 4 is a diagram showing a signal format on a sector of an optical disc in a third embodiment of the present invention.

5A is a diagram illustrating (1,7) RLLC conversion. FIG. 5B is a diagram illustrating (2,7) RLLC conversion. FIG. 5C is a diagram illustrating mark edge recording. FIG. 1E illustrates the recording density when RLLC and mark edge recording are applied. FIG. 2E illustrates the recording density when (2,7) RLLC and mark edge recording are applied.

FIG. 6A is a plan view of the movement of an optical disk and an optical head according to a fourth embodiment of the present invention viewed from the direction of the rotation axis of the optical disk and a direction perpendicular to the rotation axis. FIG. 14C shows the correspondence between the zones accessed by the first optical head and the second optical head at the time of recording in the fourth embodiment. FIG. 14C shows the signal format on the sector of the optical disc in the fourth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of an optical disc recording apparatus according to a fourth embodiment of the present invention.

FIG. 8A is a block diagram showing a configuration of an optical disk recording apparatus according to a fifth embodiment of the present invention. FIG.

FIG. 9 is a block diagram showing a configuration of an optical disc recording device according to a sixth embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of an optical disc recording device according to a seventh embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of an optical disc recording apparatus according to an eighth embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of an optical disc recording device according to a ninth embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of an optical disc recording apparatus according to a tenth embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration of an optical disc recording apparatus according to an eleventh embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Optical disk in 1st Example, 6th Example, 7th Example, 8th Example, and 9th Example 2 Input information (video data) 3 Recording setting 4 Optical head 5 Optical head control means 6 Address information identification means 7 Spindle motor in the first embodiment 8 Storage means 9 Recording means in the first embodiment 10 System control means 11 Data read from storage means 12 Recording signal 13 Tracking error reproduction signal 14 Tracking error signal 15 Address reproduction signal 16 Address information 17 Track return command 18 Tracking control signal 19 Recording start control command 20 Storage unit read control command 21 Storage data amount (Q) 22 Intermittent recording cycle 23 Optical disc in second embodiment 24 Address information area 25 Mode recording area of optical disc in second embodiment 26 Information Recording area 27 LPC area (LPC) 28 Gap area (GAP) 29 Preamble (Pre) 30 Mode recording area of optical disk in third embodiment 31 Optical disk in third embodiment 32 Second and third embodiments Spindle motor in the example 33 Recording means in the second and third embodiments 34 Recording mode setting signal 35 Optical disc in the fourth embodiment 36 Emergency recording area 37 Normal recording area 38 Optical disc in the fourth embodiment Sector 39 first optical head 40 second optical head 41 spindle motor in the fourth embodiment 42 distribution means 43 first recording means 44 second recording means 45 first digital data 46 first recording signal 47 second digital data 48 second recording signal 49 first address reproduction No. 50 First address information 51 Second address reproduction signal 52 Second address information 53 First tracking error reproduction signal 54 First tracking error signal 55 Second tracking error reproduction signal 56 Second tracking error signal 57 First Track Return Command 58 First Tracking Control Signal 59 Second Track Return Command 60 Second Tracking Control Signal 61 First Recording Start Control Command 62 Second Recording Start Control Command 63 First Recording Mode Setting signal 64 second recording mode setting signal 65 distribution mode setting signal 66 sync block 67 history information storage means 68 history information of off-track 69 history information read from history information storage means 70 optical disc 71 in fifth embodiment 71 history information Recording area 72 Information compression means 73 in the sixth embodiment Recording means in the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, and the eleventh embodiment. 74 Sixth embodiment, seventh embodiment Example, spindle motor in the eighth, ninth, tenth, and eleventh embodiments 75 Compressed data in the sixth embodiment 76 Compression rate setting in the sixth embodiment Signal 77 Compressed data in the seventh embodiment 78 Compression rate setting signal in the seventh embodiment 79 ECC encoding means 80 Error correction encoded data 81 Code setting signal 82 Video signal A / D conversion means 83 Analog Video signal 84 Video data after A / D conversion 85 Quantized bit setting signal in ninth embodiment 86 A / D conversion means for audio signal in tenth embodiment 87 Analog audio signal 88 Tenth embodiment 89 A / D-converted audio data 89 A quantized bit setting signal in the tenth embodiment 90 A / D conversion means in the eleventh embodiment 91 A / D-converted audio data in the eleventh embodiment 92 Sampling frequency setting signal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI G11B 20/18 520 G11B 20/18 520E 550 550Z 552 552E 576 576A (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 7/00-7/013 G11B 20/10 G11B 20/18

Claims (17)

(57) [Claims] A spiral or concentric track is provided on one or both sides of a disk, and at least one address information area and at least one address information area are provided for each sector obtained by dividing the track into a predetermined length or more. Mode notes
A recording area and at least one information recording area , wherein the address information area is an optical disc on which address information for identifying a position on a disk is recorded in advance by a shape change.
In addition, the optical disk accesses the track and writes information.
An optical head for recording, and information recording connected to the optical head.
During recording, a tracking error signal is detected and the optical head is turned on.
Optical head control means for driving and rotating the optical disc
A spindle motor to be operated and a number for identifying the address information.
Location information identification means and temporarily store input information entered during recording
Storage means for temporarily storing and reading, and connected to the optical head.
Digital data read from the storage means.
Recording means for recording through the optical head,
Optical disc comprising system control means for controlling the body
It is recorded using the clock recording apparatus, the recording of information during normal recording at a predetermined recording clock frequency
The track detected by the optical head control means.
King error signal and identified by the address information identification means
At least one of the above-mentioned address information
The stem control means monitors and detects the off-track,
Information recording operation of the recording means when detecting that the
And reading the digital data from the storage means.
And the optical head control means controls the optical head.
Return to the track at the time when the off-track was detected, and
After the return of the recording head is completed, the digital
Resumes reading the data from the storage means.
Recording clock frequency according to the amount of the digital data
The number is changed and recording is resumed, and the digital
When the amount of data falls below a predetermined amount, the recording clock
Return to the normal recording frequency and continue recording.
Is, the recording density information to the mode storage area obtained by encoding clock frequency for recording information on the information recording area is serial
An optical disc characterized by being recorded . 2. A spiral or concentric track is provided on one or both sides of a disk, and at least one address information area, at least one address information area, Mode notes
A recording area and at least one information recording area, wherein the address information area is an optical disc on which address information for identifying a position on a disk is recorded in advance by a shape change.
In addition, the optical disk accesses the track and writes information.
An optical head for recording, and information recording connected to the optical head.
During recording, a tracking error signal is detected and the optical head is turned on.
Optical head control means for driving and rotating the optical disc
A spindle motor to be operated and a number for identifying the address information.
Location information identification means and temporarily store input information entered during recording
Storage means for temporarily storing and reading, and connected to the optical head.
The digital data read from the storage means.
Recording which is modulated into a recording modulation code and recorded through the optical head.
Means and system control means for controlling the entire apparatus.
The digital data is recorded by an optical disk recording device equipped with
The optical head control means modulates the
The detected tracking error signal and the address
The address information identified by the information identification means
At least one of them is monitored by the system control
Out of track.
Suspending the information recording operation of the recording means, and
The reading of digital data is interrupted, and the optical head control is stopped.
At the time when the control means detects the off-track of the optical head.
After returning to the track and completing the return of the optical head,
Restarting reading of the digital data from the storage means,
The amount of the digital data stored in the storage means
Change the type of recording modulation code according to the
The amount of digital data in the storage means is less than a predetermined amount.
The recording modulation code during normal recording.
It continues recording back to code, in the mode storage area optical disc, characterized in that the modulation code identification information obtained by encoding the type of the recording modulation code for recording information on the information recording area is recorded. 3. An LPC area having a certain length or more necessary for controlling recording laser power is provided immediately after an address information area of each sector or immediately before a mode recording area. Immediately before the recording area, a gap area of a certain length or more necessary for setting a clock frequency at the time of recording or reproduction is provided, and at least one preamble is provided at least at the head of the information recording area, PLL of playback clock
3. The optical disk according to claim 1, wherein a pattern signal for locking the optical disk is recorded. 4. An optical head for accessing a track formed on an optical disk and recording information, and an optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head. A spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and storage means for temporarily storing and reading input information input during recording. Recording means for converting digital data connected to the optical head and read from the storage means and recording the data through the optical head;
System control means for controlling the entire apparatus, while recording information at a predetermined recording clock frequency during normal recording, the tracking error signal detected by the optical head control means, and the address information identification means The system control means monitors at least one of the identified address information and the off-track is detected,
When detecting the off-track, the information recording operation of the recording means is interrupted, the reading of the digital data from the storage means is interrupted, and the optical head control means moves the optical head to the track at the time of detecting the off-track. After the completion of the restoration of the optical head, reading of the digital data from the storage means is resumed, and a recording clock frequency is changed according to the amount of the digital data stored in the storage means to resume recording. An optical disk recording apparatus, wherein when the amount of digital data in the storage means becomes equal to or less than a predetermined amount, the recording clock frequency is returned to the frequency for the normal recording and recording is continued. 5. An optical head for accessing a track formed on an optical disk and recording information, and an optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head. A spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and storage means for temporarily storing and reading input information input during recording. A recording unit connected to the optical head for modulating digital data read from the storage unit into a recording modulation code and recording the data through the optical head; and a system control unit for controlling the entire apparatus. Sometimes, the digital data is modulated by a predetermined recording modulation code and recorded while being detected by the optical head control means. When the system control means monitors at least one of the issued tracking error signal and the address information identified by the address information identification means to detect an off-track, and detects an off-track, Suspending the information recording operation of the recording means, suspending the reading of the digital data from the storage means, returning the optical head to the track at the time when the off-track was detected by the optical head control means, After the return is completed, reading of the digital data from the storage means is restarted,
The type of the recording modulation code is changed according to the amount of the digital data stored in the storage means, and recording is restarted. When the amount of digital data in the storage means becomes a predetermined amount or less, the recording modulation code is changed. An optical disc recording apparatus, wherein the recording modulation code is returned to that for the normal recording to continue the recording. 6. A spiral or concentric track is provided on one or both sides of a disk, and an address for identifying a position on the disk is provided in each sector obtained by dividing the track into a predetermined length or more. At least one address information area in which information is recorded in advance by shape change and at least one information recording area for recording information are included.
Look, the region comprising a plurality of said sectors of the outer circumference side of the disc and emergency recording area, a region consisting of sectors other than the sectors belonging to the emergency recording area and normal recording area light
A disc, wherein the optical disc is a disc configured on the optical disc.
An optical head for accessing information and recording information;
Connected to the head, tracking error signal when recording information
Head control means for detecting a signal and driving the optical head
A spindle motor for rotating the optical disc;
Address information identifying means for identifying the address information;
Storage means for temporarily storing and reading input information that has been input
When connected to the optical head read from said storage means
The digital data is converted and passed through the optical head.
Recording means for recording the optical head;
History information storage means for storing previous address information, and apparatus
An optical disk having system control means for performing overall control
It is recorded by a disk recording device, while recording information in the normal recording area during normal recording.
The track detected by the optical head control means.
King error signal and identified by the address information identification means
At least one of the above-mentioned address information
Stem control monitors and detects off-track.When off-track is detected, off-track occurs .
Storing the address information of the sector in the history information storage means;
The information recording operation of the recording means is interrupted,
The reading of the digital data by the storage means is interrupted, and
The recording head control means controls the optical head to record in the emergency recording area.
To the sector within the area, and after the movement of the optical head is completed,
Resume reading of the digital data from the storage means
Immediately after the off-track occurs in the emergency recording area
From the storage means, and the amount of digital data in the storage means falls below a predetermined amount.
The recording operation of the recording means is interrupted,
Reading of the digital data from the storage means is interrupted
The address information of the sector where the recording operation was interrupted.
The history information storage means is stored in the history information storage means.
Based on the history information stored in the
Moving the optical head to the rubbed sector;
After the completion of the movement of the digital data,
Resume reading and suspend recording in the emergency recording area
The information immediately after recording is continuously recorded in the normal recording area.
An optical disk, wherein the amount of information recorded and recorded in the sector belonging to the emergency recording area is larger than the amount of information recorded in the sector belonging to the normal recording area. 7. An information recording area of each sector is divided into a plurality of block recording areas, a fixed amount of information is recorded in each block recording area, and the number of block recording areas in the sector belonging to an emergency recording area 7. The optical disc according to claim 6, wherein the number of the block recording areas is larger than the number of block recording areas in the sector belonging to the normal recording area. 8. The address information of the source sector when the track jumps from the normal recording area to the emergency recording area or from the emergency recording area to the normal recording area, and the address information of the destination sector. At least one of the history information recording area for recording at least one of the inside of the normal recording area, the inside of the emergency recording area, and the outside of the normal recording area and the emergency recording area. Or 1
The optical disk according to claim 6 , wherein the optical disk is provided at a location. 9. An optical head for accessing a track formed on an optical disc having a normal recording area on an inner peripheral side and an emergency recording area on an outer peripheral side to record information, and connected to the optical head to record information. Optical head control means for detecting a tracking error signal during recording and driving the optical head; a spindle motor for rotating the optical disc; and address information identifying means for identifying address information pre-recorded on the track of the optical disc. A storage unit for temporarily storing and reading input information input at the time of recording; a recording unit connected to the optical head for converting the digital data read from the storage unit and recording through the optical head; History information storage means for storing address information immediately before the movement of the optical head, and a system control means for controlling the entire apparatus While recording information in the normal recording area during normal recording, the tracking error signal detected by the optical head control means, and the address information identified by the address information identification means, The system control means monitors at least one of them to detect an off-track, and when the off-track is detected, stores the address information of the sector in which the off-track occurred in the history information storage means, Suspending the information recording operation of the means, suspending the reading of the digital data from the storage means, moving the optical head to a sector in the emergency recording area by the optical head control means, and completing the movement of the optical head. rear,
Restarting the reading of the digital data from the storage means, sequentially recording information from immediately after the off-track has occurred in the emergency recording area, and when the amount of digital data in the storage means has become less than a predetermined amount. Suspending the information recording operation of the recording means, suspending the reading of the digital data from the storage means, storing the address information of the sector in which the recording operation was suspended in the history information storage means, The optical head is moved to the sector where the previous off-track occurred based on the history information stored in the storage means, and after the movement of the optical head is completed, reading of the digital data from the storage means is resumed, and An optical disc recording apparatus characterized by continuously recording information immediately after interrupting recording in an emergency recording area in said normal recording area. 10. A normal recording area to an emergency recording area,
10. The optical disc recording apparatus according to claim 9, wherein the apparatus is operated to record history information of a track jump from the emergency recording area to the normal recording area in a history information recording area provided on the optical disc. 11. During recording of a series of information, even if there is no unrecorded area in the normal recording area on the optical disc, if the unrecorded area remains in the emergency recording area, the recording is continued to the unrecorded area. 11. The optical disk recording apparatus according to claim 9 , wherein the optical disk recording apparatus is operated to perform recording. 12. An optical head for accessing a track formed on an optical disk and recording information, and an optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head. A spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and information compression means for compression-coding input information input at the time of recording; Storage means for temporarily storing and reading digital data encoded by the information compression means, and recording means connected to the optical head for converting the digital data read from the storage means and recording through the optical head And system control means for controlling the entire apparatus. While recording the compressed information, the system control unit monitors at least one of the tracking error signal detected by the optical head control unit and the address information identified by the address information identification unit. To detect the off-track, and when the off-track is detected, suspends the information recording operation of the recording means, suspends the reading of the digital data from the storage means, and causes the optical head control means to track the optical head. Return to the track at the time of detection of departure,
After the completion of the return of the optical head, reading of the digital data from the storage means is resumed, and during that time, the digital data compressed and encoded by the information compression means according to the amount of the digital data stored in the storage means. And when the amount of digital data in the storage unit becomes equal to or less than a predetermined amount after recording is resumed, the compression ratio is returned to the compression ratio for the normal recording, and the recording operation is continued. Optical disk recording device. 13. An optical head for accessing a track formed on an optical disk and recording information, and an optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head. A spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and information compression means for compression-encoding input information input during recording, Storage means for temporarily storing and reading digital data encoded by the information compression means, and recording means connected to the optical head for converting the digital data read from the storage means and recording through the optical head And system control means for controlling the entire apparatus. While recording the compressed information, the system control unit monitors at least one of the tracking error signal detected by the optical head control unit and the address information identified by the address information identification unit. To detect the off-track, and when the off-track is detected, suspends the information recording operation of the recording means, suspends the reading of the digital data from the storage means, and causes the optical head control means to track the optical head. Return to the track at the time of detection of departure,
After the completion of the return of the optical head, reading of the digital data from the storage means is resumed, and a compression ratio of digital data compression-encoded by the information compression means is changed for a predetermined period after detecting an off-track, An optical disc recording apparatus, wherein after the predetermined period has elapsed, the recording operation is continued by returning the compression ratio to the compression ratio at the time of the normal recording. 14. An optical head for accessing a track formed on an optical disk and recording information, and an optical head control means connected to the optical head for detecting a tracking error signal at the time of recording information and driving the optical head. A spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and ECC encoding means for adding an error correction code to input information input at the time of recording When,
Storage means for temporarily storing and reading digital data encoded by the ECC encoding means, and recording means connected to the optical head for converting the digital data read from the storage means and recording through the optical head And a system control means for controlling the entire apparatus, while recording information with a predetermined error correction code added during normal recording, the tracking error signal detected by the optical head control means, The system control means monitors at least one of the address information identified by the address information identification means and detects an off-track. When the off-track is detected, the information recording operation of the recording means is interrupted. Reading the digital data from the storage means is interrupted, and the optical head control means The optical disk is returned to the track at the time when the off-track is detected, and after the return of the optical head is completed, reading of the digital data from the storage means is restarted, and during that time, the amount of the digital data stored in the storage means is reduced. The type of the error correction code added by the ECC encoding means is changed accordingly, and when the amount of digital data in the storage means becomes equal to or less than a predetermined amount after recording is resumed, the error correction code is stored in the normal recording mode. An optical disc recording apparatus characterized in that the recording operation is continued by returning to the error correction code. 15. An optical head for accessing a track formed on an optical disk for recording a video signal and recording a video signal, and connected to the optical head for detecting a tracking error signal during recording of the video signal and for detecting the tracking error signal. An optical head control means for driving the optical disc, a spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and an analog / A / D conversion means for performing digital conversion, storage means for temporarily storing and reading digital data A / D converted by the A / D conversion means, connected to the optical head and read out from the storage means Recording means for converting the digital data and recording through the optical head, and a system for controlling the entire apparatus A tracking error signal detected by the optical head control means and identified by the address information identification means while recording a video signal quantized by a predetermined number of bits during normal recording. The system control means monitors at least one of the address information and the off-track, and when the off-track is detected, the recording operation of the recording means is interrupted, and the digital data in the storage means is read. And the optical head control means returns the optical head to the track at the time when the off-track is detected.After the completion of the return of the optical head, the reading of the digital data from the storage means is resumed. Quantization of an input video signal in the A / D conversion means according to the amount of the digital data stored in the storage means. The number of bits is changed, and when the amount of digital data in the storage unit becomes equal to or less than a predetermined amount after the recording is resumed, the number of quantized bits is returned to the number of quantized bits during the normal recording, and the recording operation is continued. An optical disk recording device characterized by the above-mentioned. 16. An optical head for accessing a track formed on an optical disk for recording an audio signal and recording an audio signal, and connected to the optical head and detecting a tracking error signal during recording of the audio signal and detecting the tracking error signal. An optical head control means for driving the optical disc, a spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and an analog / audio signal inputted at the time of recording. A / D conversion means for performing digital conversion, storage means for temporarily storing and reading digital data A / D-converted by the A / D conversion means, and connected to the optical head and read from the storage means Recording means for converting the digital data and recording through the optical head, and a system for controlling the entire apparatus A tracking error signal detected by the optical head control means and identified by the address information identification means while recording an audio signal quantized by a predetermined number of bits during normal recording. The system control means monitors at least one of the address information and the off-track and detects the off-track. When the off-track is detected, the recording operation of the recording means is interrupted, and the digital data in the storage means is read. And the optical head control means returns the optical head to the track at the time when the off-track is detected.After the completion of the return of the optical head, reading of the digital data from the storage means is resumed. The A / D converter according to the amount of the digital data stored in the storage means.
The number of quantization bits of the input audio signal in the conversion means is changed, and when the amount of digital data in the storage means becomes equal to or less than a predetermined amount after recording is resumed, the number of quantization bits is changed to the quantization bit in the normal recording. An optical disk recording apparatus, wherein the recording operation is continued after returning to the original number. 17. An optical head for accessing a track formed on an optical disk for recording an audio signal and recording an audio signal, and connected to the optical head to detect a tracking error signal during recording of the audio signal and to detect a tracking error signal. An optical head control means for driving the optical disc, a spindle motor for rotating the optical disc, address information identifying means for identifying address information pre-recorded on the track of the optical disc, and an analog / audio signal inputted at the time of recording. A / D conversion means for performing digital conversion, storage means for temporarily storing and reading digital data A / D-converted by the A / D conversion means, and connected to the optical head and read from the storage means Recording means for converting the digital data and recording through the optical head, and a system for controlling the entire apparatus A tracking error signal detected by the optical head control means while recording the A / D-converted audio signal at a predetermined sampling frequency during normal recording. With the identified address information,
The system control means monitors at least one of them to detect the off-track, and when the off-track is detected,
Suspending the recording operation of the recording means, suspending the reading of the digital data from the storage means, returning the optical head to the track at the time when the off-track was detected by the optical head control means, After completion, reading of the digital data from the storage means is resumed,
In the meantime, the sampling frequency of the input audio signal in the A / D converter is changed according to the amount of the digital data stored in the storage, and after the recording is resumed, the amount of digital data in the storage is reduced by a predetermined amount. An optical disc recording apparatus, wherein the recording frequency is returned to the sampling frequency for the normal recording and the recording operation is continued when the following conditions are satisfied.