JPH05109205A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a disk recording device which detects a defected sector and skips the defected sector to record continuously inputted signals with a high reliability. CONSTITUTION:Low rate input signals 102 are converted to a high rate by a time axis compression means 103, a sector forming means 105 configures the signals into sectors and recorded in an optical disk 101. An operation mode control means 112 selects either a recording mode or a standby mode which is a combination of track jump and reproduction modes in accordance with a sector address 114 which is reproduced by a sector address reproduction means 113 and a data remaining amount 115 inside the time axis compression means 103 and outputs recording command 111. If the sector address 114 becomes an error in a recording operation, the operation mode control means 112 immediately retrieves the recording command 111 and controls so as not to record in the defected sector and instructs the means 103, 105 and 107 to hold the processes. Again, the processes are restarted when a normal sector is reproduced and the recording operation takes place by skipping the defected sector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording apparatus for recording information such as audio on a disc and a disc reproducing apparatus for reproducing recorded information.

[0002]

2. Description of the Related Art In recent years, a compact disc (hereinafter referred to as
Write as CD. ) Is very popular. Although the CD is for reproduction only, the technology of a disk recorder for recording / reproducing a digital signal using a disk has been actively announced, and a part of the CD has been commercialized.

FIG. 15 is a diagram showing a sector format of a 130 mm rewritable disc standardized by ISO / IEC. In FIG. 15, one sector has a total of 136
It is composed of 0 bytes (hereinafter, the byte is referred to as B). 1
Is a header in which address information and the like previously written by using pits and the like at the time of manufacturing the disc are recorded, and is constituted by 52B. The area of the header 1 performs only the reproducing operation and does not record. The header 1 reproduces the address information and obtains a timing reference for performing the next recording operation. 2 GAP 1 and 5 GAP
Reference numeral 2 is an area for starting and ending recording at the time of rewriting, and a size is secured in consideration of the speed deviation of the disc. The VFO of 3 is a PLL for the subsequent data demodulation.
Is a PLL pull-in area for locking the. D
The ATA / ECC area 4 is composed of 1262B. The configuration is shown in the lower part of FIG. SB of 6 is a sync detection signal, D of 7 is a data byte, and P of 8 is A for auxiliary data.
UX byte, C of 9 is a cyclic code for error detection (CR
C) and E of 10 are error correction codes, and RS of 11 is a data resynchronization byte. Data bytes are D1 to D10
It consists of up to 24 1024 bytes. Generally, rewritable discs are often used for recording data files in computers and the like. Therefore, the data capacity of the sector, which is the rewriting unit, is a power of 2 including the floppy disk. The error correction code E of 10 is generated for the data in the same sector and is completed in the sector. When rewriting the DATA and ECC areas, the timing is generated from the reproduced header 1 and the areas from GAP1 of 2 to GAP2 of 5 are rewritten all at once, thereby rewriting in sector units.

By the way, in recent years, there has been a remarkable progress in data compression technology for performing data transmission or recording / reproducing of data with a smaller amount of information while preventing deterioration of signal quality. For example, a method of compressing an information amount of a sampling frequency of 48 KHz and a quantization bit number of 16 bits used in DAT or the like to 1/4, that is, an average of 4 bits per sample is MPEG (Moving Picture Experts Grou).
p). This compression method is a method in which an acoustic signal is divided into a plurality of bands (subbands) by a bandpass filter group, and the number of bits is flexibly allocated according to the energy and auditory characteristics of the signal for each band.

As a method of recording the compressed data on the disk as described above, there is a method of continuously recording the compressed data having a low transfer rate at the same rate,
A method is conceivable in which data on a low transfer rate is subjected to time-base compression to be converted to a high transfer rate and recording is performed intermittently. When performing intermittent recording, it is possible to match the input data rate with the recorded data rate by alternately repeating the recording mode at a high transfer rate and the reproduction mode that combines track jumps. Is.

[0006]

Considering the case where recording is performed using the optical disk recorder based on the format shown in FIG. 15, the address information portion and the recording area written in the header 1 of FIG. Conventionally, when the reproduction or recording cannot be performed due to defects, scratches, dust, etc., (1) the address is interpolated and recording is continuously continued as it is.

(2) The data to be recorded in the sector is recorded in another alternative sector without recording in the sector. Is being considered. However, according to the method (1), the recording start and end timings cannot be generated from the original header of the sector, and recording is performed using the header of the preceding sector as the timing reference. Therefore, when the speed deviation due to the uneven rotation of the disc is large, the recording start and end are not performed within the section of GAP1 to GAP2, and not only the adjacent area may be erased, Since the header writes important data in a sector in which the header cannot be reproduced, the reliability of the recorded data itself is significantly reduced.

On the other hand, the above method (2) is also adopted in the above-mentioned ISO standard. By providing an alternative sector to record the data of the defective sector, which defective sector is rewritten to which alternative sector. It has a management table to show. However, considering the case of recording continuously input data such as the above-mentioned audio data in real time, the movement time of the optical head to the alternative sector necessary for performing the above alternative processing is secured. Therefore, a large amount of buffer memory is required, and management of the replacement sector becomes complicated, which is not practical.

The present invention solves the above-mentioned problems of the prior art, and does not use a substitute sector, does not use a defective sector for recording, and is capable of recording / reproducing a disc capable of continuously inputting audio data or the like. The purpose is to provide a device.

[0010]

In order to achieve this object, the disk recording apparatus of the present invention comprises a time axis compression means for applying time axis compression processing to digitally encoded input data, and the time axis compression means. A sector generating means for adding a synchronization signal, an error correction code, etc. to the applied data to form a sector of the recording signal, and recording the recording signal having the sector structure on an optical disk by using an optical head. Recording means; defective sector detecting means for detecting the presence or absence of an error in a recorded signal in the reproducing area or the recording area in the sector; and the time axis compressing means according to the output of the defective sector detecting means, It has a recording control means for outputting a processing stop or hold command to the sector generation means and the recording means.

Further, the present invention has sector address reproducing means for reproducing the sector address from the reproduction area of the optical disc and detecting the presence or absence of an error as the defective sector detecting means.

Further, the present invention has, as defective sector detecting means, an error detecting means for reproducing a recorded signal from the recording area of the optical disk and detecting the presence or absence of an error by using an error correction code in the reproduced signal.

The present invention also has, as defective sector detection means, data comparison means for reproducing a recorded sector of the optical disk, comparing the reproduced signal with the recorded signal, and detecting the presence or absence of a mismatch.

According to the present invention, the recording means records either a sector-structured recording signal or an invalid sector identification signal indicating that recording on the sector is invalid, in the recording area. According to the detection result of the defective sector detection means, a processing stop or hold instruction is output to the time axis compression means and the sector generation means, and a recording instruction of the invalid sector identification signal is output to the recording means. It is configured.

Further, according to the present invention, the recording time of the invalid sector identification signal is made sufficiently short with respect to one sector period.

According to the present invention, the invalid sector address storage means for storing the sector address of the sector in which the recording operation is stopped or the invalid sector identification signal is recorded, or the invalid sector number storage for counting and storing the number of invalid sectors is stored. Have means.

Further, the present invention is a reproduction processing means for separating a sync signal from recorded data reproduced from a recording area and performing error correction processing of the reproduction signal using an error correction code, and the reproduction processing. Time axis expansion means for performing time axis expansion processing on the applied reproduction data, and determining whether or not the recorded data reproduced from the recording area is an invalid sector identification signal indicating that the recording is invalid Invalid sector identification signal detecting means, and reproduction control means for outputting a processing stop or suspension command to the reproduction processing means and the time axis extending means in response to the output of the invalid sector identification signal detecting means. It is configured.

[0018]

According to the present invention, when a defective sector is detected, the present invention prohibits the recording of data in the sector and stops the processing of the recording signal at each stage. If a normal sector is subsequently detected, the stop of the processing is released, so that the defective sector can be skipped and a signal continuously input can be recorded without data loss.

Further, according to the present invention, when an error occurs in the sector address in the reproduction area, it is possible to judge the sector as a defective sector and skip the sector for recording.

According to the present invention, the recorded signal is reproduced, the error correction process in the reproduced signal is performed, and when an uncorrectable error occurs in the sector, the sector is determined as a defective sector. Recording can be performed by skipping that sector.

According to the present invention, the recorded signal is reproduced, the recorded signal is compared with the reproduced signal, and if a discrepancy occurs, the sector is judged as a defective sector and the sector is skipped for recording. Will be able to do.

Further, according to the present invention, the invalid sector can be easily detected at the time of reproduction by recording the invalid sector identification signal indicating that the recording in the sector determined to be defective is not valid for the sector determined to be defective. Will be possible.

Further, according to the present invention, the invalid sector identification signal can be set shorter than the normal data recording section, and the header of the next sector can be surely detected even when the speed deviation is large.

Further, according to the present invention, the address or the number of invalid sectors is stored by the above-mentioned configuration, and the calculation is performed when calculating the recording data amount or recording time calculated from the recording start sector address and the end address of the recording data. Can be performed easily and with high precision.

Further, according to the present invention, with the above configuration, the invalid sector signal is detected from the reproduced signal, the signal processing at each stage of the reproduced signal is stopped, and if the normal sector is continuously detected, the stop of the processing is released. This makes it possible to skip defective sectors and continuously reproduce signals without omission.

[0026]

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

FIG. 1 is a block diagram showing the structure of a disk recording apparatus according to the first embodiment of the present invention. First,
A recording / reproducing method implemented by the disc recording / reproducing apparatus of the present invention will be described. In FIG. 1, a low transfer rate input signal 102 has its time axis compressed by a time axis compression means 103 and is converted into a high transfer rate signal. The time axis compression means 103 is specifically constituted by a memory means,
Writing is performed at a low transfer rate, and the time axis is compressed by being read at a high rate clock.
The high rate clock is generated based on the recording command 111. Since data reading at a high transfer rate is completed in a shorter time than writing at a low transfer rate, data reading is intermittently performed according to the recording command 111. Compressed data 104 read from the time axis compression means 103
Is input to the sector generation means 105, where processing such as error correction code, synchronization signal addition, and modulation is performed, converted into a sector format as shown in FIG.
It is output as 6. In the recording means 107, the recording signal 10
6, a laser drive signal 108 for driving the optical head 109
To the optical disc 101 by the optical head 109.
Is recorded on the track. Although not shown, rotation control of the optical disc 101 is performed by a spindle control unit and a spindle motor.

On the other hand, the header information pre-formatted on the track of the optical disc 101 is the optical head 1
09, and is supplied to the sector address reproduction means 113 as an address reproduction signal 110. The sector address reproduction means 113 separates and extracts the sector address 114 from the address reproduction signal 110, and also checks the reliability of the extracted sector address using an error detection or correction code relating to the sector address. In the operation mode control means 112, the remaining data amount 115 indicating the amount of data accumulated in the memory in the time axis compression means 103 output from the time axis compression means 103, and the sector address 114 output from the sector address reproduction means 113. The recording command 111 is generated based on the
3, output to the sector generation means 105 and the recording means 107. In other words, the amount of data in the time axis compression means 103 is the capacity of a predetermined number of sectors to be recorded next (in this example, for the sake of simplicity, sectors for one rotation of the disk are continuously recorded at one time). Remaining data 11
5, the operation mode control means 112 outputs a recording command 111 to record a predetermined number of sectors on the optical disc 101 at the time when the next sector for which recording has been completed last time is detected by the sector address 114. ..

After the recording operation is completed, the operation mode control means 112 outputs a track jump command 116 to the track jump control means 117. The track jump control means 117 causes the optical head 109 to perform a track jump to a predetermined track by the tracking control output 118, and then controls the tracking so that the track is performed.

FIG. 2 shows an example of tracks on the disc on which recording is performed in this embodiment. In this example, recording is performed from the inner circumference to the outer circumference on a track formed on a spiral, and one rotation of the disk is defined as one track. Now, let us consider a case where recording is performed in order from the inner track, and recording is now performed on track N (thick line portion in FIG. 2). As described with reference to FIG. 1, the input data has a low transfer rate, whereas the recording is performed at a high data rate.
The data capacity in the time base compression means 103 decreases during the recording operation. Therefore, when the predetermined number of sectors are recorded on the track N, the recording is temporarily stopped, the track is jumped to one inner track, and the track N is again set as the reproduction mode while the memory capacity in the time axis compression means 103 is increased. Wait for the recovery. Recording is restarted from the time when the memory capacity becomes equal to or larger than the data amount to be recorded in the predetermined number of sectors and the optical head 109 reaches the sector next to the previous recording end sector. As described above, input data with a low transfer rate is subjected to time-axis compression, recording is performed intensively at a high transfer rate, and the vacant time is adjusted by repeating the track jump and the playback mode. It is possible to form a continuous recording area.

FIG. 3 shows the relationship between the transfer data amount and time when the above recording operation is performed. The horizontal axis represents time, which is divided for each rotation of tracks N-4 to N tracked by the optical head. In the operation mode, R indicates recording, P indicates reproduction, and J indicates jumping. The thin solid line in FIG. 3 indicates the amount of input data, the thick solid line indicates the amount of data to be recorded, and the alternate long and short dash line indicates the remaining amount of data in the time axis compression means 103. The input data amount continuously increases with time, whereas the recording data amount increases only in the recording mode and becomes constant during the reproduction and jump operations. Therefore, the remaining amount of data in the time base compression means 103, which is the difference between the two, is shown in FIG.
As shown in, the increase and decrease is repeated in a sawtooth shape. Figure 3
Shows the case where the recording data rate is about three times the input data rate. The recording operation is performed for a sector of approximately one track for three rotations of the disk, and the remaining two rotations are performed by jumping and reproducing mode. We are trying to match rates.

Next, the operation when there is a defect in the sector to be recorded will be described. FIG. 4 is a waveform diagram showing the operation when the sector address causes a detection error during recording in the first embodiment. Now, when the optical head 109 reaches the sector M (M is a sector address) on the disk, a recording command 111 is output, and the time axis compression means 103 outputs the compressed data 104 to the sector generation means 105.
Further, a recording signal 106 is output from the sector generation means 105, and recording is performed on the optical disc 101 via the recording means 107. The sector generation means 105 requires time for signal processing such as error correction code generation.
Therefore, if the recording data for the sector M is D0, the data read from the time axis compression unit 103 during this period is the data D1 for recording in the next sector.

Now, the operation when the sector address of the sector M + 2 on the disk cannot be detected during the above recording operation or an error is detected by the error detection code added to the sector address will be described. The detection of the sector address and the detection of the error are performed by the sector address reproducing means 113. When the sector address is reproduced normally, the address value itself is output to the operation mode control means 112 as a sector address 114, which indicates an error when the sector address is not reproduced normally. In FIG. 4, the broken line portion of the sector address 114 indicates that the sector address is incorrect. The operation mode control means 112 immediately cancels the recording command 111 in response to the error in the sector address. Therefore, the operation of each block of the time axis compression means 103, the sector generation means 105, and the recording means 107 is stopped all at once, and the compressed data 104 and the recording signal 106, which are the output signals thereof, are not output during the defective sector. As a result, as shown in the recorded sector on the bottom disk of FIG. 4, the sector M + 2 in which the sector address is not detected
The control is performed so that the recording operation for the is not performed.
As a result, it takes a long time until the recording of the predetermined number of sectors is completed by the defective sector, but since the time axis is compressed and recording is performed as described above, it is sufficient to start the next recording. Time is secured. Further, when the number of defective sectors is large, it is possible to recover the time margin until the next recording by reducing the number of jump and reproduction modes.

Since the sector address is important reference information for writing / reading to / from the sector, in general, a measure for preventing a read error from occurring,
For example, it is normal to write multiple times, but the fact that the sector address is detected incorrectly indicates that the reliability of the entire sector is low, not just the header part. .. Therefore, according to the present embodiment, when the sector address is not detected during the recording operation as described above, the processing is stopped so that the writing operation for the defective sector is not performed. You can

Next, a second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a track jump is performed on a sector where recording is once performed and reproduction is performed again, and a second recording mode is provided in accordance with an error correction situation during reproduction, and a sector that cannot be corrected during the second recording mode is recorded. By prohibiting the recording operation, the first
In the same manner as in the above embodiment, control is performed so that the defective sector is skipped and recording is performed.

FIG. 5 is a block diagram showing the structure of a disk recording apparatus according to the second embodiment of the present invention. The present embodiment is different in that the error detecting means 120 is provided as a new component in the configuration of the first embodiment. The same components and signals are assigned the same reference numerals and explanations thereof are omitted. In FIG. 5, during the disc reproducing operation, the data reproduction signal 119 reproduced from the optical head 109 is the error correction means 120.
Is input to and the recorded data is demodulated and error correction processing is performed. If an uncorrectable error occurs as a result of the error correction processing, the uncorrectable detection output 121 is output to the operation mode control means 112. The operation mode control means 112 judges the reliability of the sector by the uncorrectable detection output 121, stores the sector address of the sector when uncorrectable occurs, and judges the sector as a defective sector during the second recording operation. Then, recording on that sector is prohibited.

FIG. 6 is a waveform diagram showing the operation of each block of this embodiment. First, sectors n to n + on the optical disk
The first recording (first recording mode) is performed for No. 7. After the recording of the sector n + 7 is completed, the recording medium jumps back to the inner track one by one, reproduces the sectors n to n + 7 where the recording is completed, and the uncorrectable detection output 121 grasps the error correction status of each sector, The sector address 114 of the disabled sector is stored inside the operation mode control means 112. FIG. 6 shows an example in which uncorrectable data is detected in sector n + 2. Sector n to n depending on the playback mode
When the reproduction up to +7 is completed, it jumps back to the inner track again and returns to the second recording operation (second recording mode). The same data as in the first recording mode is read again from the time axis compression means 103 according to the recording command 111. However, in reality, the sector generation unit 106 needs to delay the processing by one sector, and therefore it is necessary to read the compressed data 104 from the time axis compression unit 103 by one sector in advance. The operation mode control means 112 does not output the recording command 111 to the defective sector based on the defective sector address stored in the reproduction mode. Therefore, the operations of the time axis compression unit 103, the sector generation unit 105, and the recording unit 107 are interrupted, and recording on the defective sector is not performed. Since the defective sector is skipped in the second recording mode, the recording data is recorded in the sectors deviated from those in the first recording mode by the skip sectors after the defective sector. In the second recording mode, it is not necessary to re-record sectors before the defective sector. Therefore, as indicated by a broken line in the recording command 111 of FIG. 6, the recording command 111 may be output from the normal sector next to the first defective sector.

As described above, according to the present embodiment, the recorded sector is reproduced again after the end of the first recording mode, the defective sector is discriminated based on the error correction situation, and the defective sector is not detected in the second recording mode. By suspending the processing of each block, the reliability of the recorded data can be ensured by re-recording the same data while avoiding the defective sector.

Next, a third embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the error correction result at the time of reproduction is used to detect the defective sector, but in the third embodiment, the sector reliability is determined by directly comparing the recorded data with the recorded data. ing.

FIG. 7 is a block diagram showing the structure of a disk recording apparatus according to the third embodiment of the present invention. In FIG. 7, the error correction means 120 performs error correction processing on the data reproduction signal 119 reproduced from the optical head 109 in the reproduction mode. The data subjected to the error correction processing is output to the data comparison unit 123 as the corrected data output 122. At the same time, the compressed data 104 for which recording has been completed is read again from the time axis compression means 103 and input to the data comparison means 123. The data comparison unit 123 outputs the corrected data output 122 and the compressed data 104.
And outputs the data comparison result 124 to the operation mode control means 112. The operation mode control means 112 determines the reliability of the sector based on the data comparison result 124, determines the sector in which the data does not match as a defective sector, and stores the sector address. Regarding the subsequent operation and processing, as in the second embodiment, the reliability of the recorded data can be secured by performing the second recording mode by skipping the defective sector. In the second embodiment, the error correction result is used to judge the defective sector.
To overlook error data that rarely occurs in error correction processing, it is more effective to directly compare data as in the third embodiment, although the hardware is increased.

FIG. 8 is a waveform diagram showing the operation of each block of the third embodiment. In FIG. 8, first, data in sectors n to n + 7 is recorded in the first recording mode. After the end of recording, a jump is made to return to the inner circumference of one track, and the sectors n to n + 7 at which recording has just ended are reproduced. The data reproduction signal 119 is subjected to error correction processing by the error correction means 120, and then output as the corrected data output 122 to the data comparison means 123. At the same time, the compressed data 104 recorded in the sectors n to n + 7 is read from the time axis compression means 103 in synchronization with the corrected data output 122, and the data comparison means 123 compares the data. The data comparison output 124 in FIG. 8 indicates that a data mismatch is detected in sector n + 2. The operation mode control means 112 stores the sector address of the sector in which the data comparison output 124 shows a non-coincidence, so that the defective sector is skipped when the second recording mode is performed, as in the second embodiment. Then, it is possible to re-record the data.

As described above, according to the present embodiment, the recorded sector is reproduced again after the end of the first recording mode, and the defective sector where the mismatch occurs is discriminated by comparing with the recorded data, and the second sector is detected. In the recording mode, by suspending the processing of each block in the defective sector, the reliability of the recorded data can be secured by avoiding the defective sector and re-recording the same data.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. In the first to third embodiments, the method of ensuring the reliability of the recorded data by detecting the defective sector and skipping the defective sector in the second recording mode to perform re-recording has been described. In the fourth embodiment, a method of more easily detecting a skipped defective sector when reproducing an optical disc on which recording is performed by skipping a defective sector by the above three embodiments will be described.

In the present embodiment, the above functions are realized by configuring the inside of the sector generation means 105 in the blocks of the first to third embodiments with the configuration shown in FIG. In FIG. 9, the compressed data 104 output from the time axis compression unit 103 in the second recording mode is the recording signal generation unit 125.
In, the recording signal processing such as the generation of the error correction code is performed, and the normal recording signal 126 is output to the selector 127. On the other hand, the invalid sector identification signal generation means 128 generates an invalid sector identification signal 129 which is an identification signal for invalidating the sector at the time of reproduction, and the selector 1
27 is output. As the invalid sector identification signal 129, a continuous repeating signal of a fixed pattern that does not appear in the recording signal is used. The selector 127 is the operation mode control means 1
A normal recording signal 126 is selected for a normal sector and an invalid sector identification signal 129 is selected for a defective sector by a recording signal selection command 130 supplied from 12 and output as a recording signal 106 to the recording means 107. Due to
An invalid sector identification signal is recorded for the defective sector.

As described above, according to this embodiment, the invalid sector identification signal is recorded in the second recording mode with respect to the defective sector, the data recorded in the first recording mode is erased, and at the time of reproduction. By detecting the invalid sector identification signal, the defective sector can be easily skipped and reproduced. The reproducing method using the invalid sector identification signal will be described in the seventh embodiment.

Next, a fifth embodiment of the present invention will be described with reference to the drawings. Generally, a rotation speed constant method (CAV) and a constant linear velocity method (C
LV), the latter method is advantageous in terms of data recording capacity. In CLV, rotation control may be performed based on the period from the header of a sector to a constant linear velocity, but if there is a defect in the sector, rotation control will become unstable, and the rotation will be unstable in the vicinity of that sector. The linear velocity may be faster or slower than the original linear velocity. The present embodiment relates to recording of an invalid sector identification signal when the linear velocity becomes high, that is, when the sector period becomes short.

FIG. 10 is a waveform diagram showing the length of a recording command for instructing actual recording on the disk with respect to the sector period. A of FIG. 10 shows the output timing of the recording command with respect to the sector period when the normal recording is performed at the normal linear velocity, and shows that the area from immediately after the end of VFO to the head of GAP2 is the area to be recorded. There is. B of FIG. 10 shows a case where an invalid sector identification signal is recorded when a sector has a defect. When the linear velocity becomes slow due to the influence of the defective sector, the sector period becomes long even if the recording command is output in the same section as in the normal recording, but no particular problem occurs, but as shown in B of FIG. When the sector cycle is shortened due to the higher linear velocity, when the recording command is output at the same timing as the normal recording, the recording is passed up to GAP2 where the recording should be finished, and the data is recorded up to the header of the next sector. It is possible that the operation is continued and the sector address of the next sector, which is not originally defective, becomes unreadable. Therefore, in this embodiment, as shown in FIG. 10C, the recording command is set to be sufficiently shorter than that in the normal recording only when the invalid sector identification signal is recorded, so that the recording operation does not continue to the header portion of the next sector. It has a simple structure. As a concrete block, the operation mode control means 112 which manages the defective sector in the first to third embodiments outputs the recording commands of the above two types of lengths according to the situation of the sector. To configure. Further, since the invalid sector identification signal is a fixed pattern repeat, it is not necessary to record until the end of the sector if it is recorded with a sufficient number of repeats required for detection.

As described above, according to the present embodiment, by setting the recording section of the invalid sector identification signal for the defective sector shorter than that during normal data recording, when the linear velocity fluctuation due to the defective sector is large. Also, the header of the next sector can be read reliably.

Next, a sixth embodiment of the present invention will be described with reference to the drawings. Generally, the optical disc has a function of managing a recorded data as a file by providing another area. A typical management item for a plurality of files recorded on an optical disk is a file length, or time information when the file is audio information or the like. Specifically, these pieces of information are managed by the sector address on the optical disk, and the start sector address and end address of the file are recorded on the file management table.

On the other hand, in the first to third embodiments of the present invention, the method of skipping and recording the defective sector has been described. Finally, since valid data is not recorded in the skipped defective sector, it is necessary to skip the defective sector when reproducing. As an effective means for reproducing a defective sector while skipping it, in the fourth embodiment, a method of recording an invalid sector identification signal in the defective sector has been described. However, since the file management information is only the start and end sector addresses as described above, if there are defective sectors in the file, errors will occur especially when the sector address is converted to time information and displayed. Will occur. In the sixth embodiment, the number of defective sectors skipped in the second recording mode in each file can be grasped.

In FIG. 11, an invalid sector address table is prepared in a file management area or the like, and the sector addresses of the sectors in which the invalid sector identification signal is recorded in the second recording mode are sequentially recorded. Therefore, by searching the invalid sector address table for invalid sectors within the range of the start address and end address of a file in the file table, the number of defective sectors in the file can be grasped, and when performing time conversion. Can be converted with high accuracy by subtracting the number of defective sectors from the total number of sectors of the file for conversion.
It can be seen that the first to third sectors in the invalid sector address table in FIG. 11 belong to the first file in the file table, and the defective sectors included in the first file are three sectors.

FIG. 12 shows a configuration example in which the number of invalid sectors is directly entered in the file table. In this case, the number of defective sectors generated during the second recording mode is counted, and the count number is recorded in the table when the recording of the file is completed. Although the absolute address of the defective sector on the disk is unknown, there is an advantage that the data capacity used for recording the table is smaller than that of the example shown in FIG.

As described above, according to the present embodiment, the number of defective sectors in each file can be easily managed by recording the table showing the number or addresses of defective sectors in another area on the optical disk. In particular, when the time conversion of the file is performed, the conversion accuracy can be improved by removing the defective sector.

Next, a seventh embodiment of the present invention will be described with reference to the drawings. The seventh embodiment relates to a disc reproducing apparatus for reproducing an optical disc in which an invalid sector identification signal is recorded in a defective sector as described in the fourth embodiment.

FIG. 13 is a block diagram showing the structure of a disk reproducing apparatus according to the seventh embodiment of the present invention. First, the normal reproducing operation will be described.

In FIG. 13, the data reproduction signal 119 reproduced from the optical disk 101 is subjected to error correction processing by the error correction means 120, and then the corrected data output 12
2 is output to the time axis expansion means 131. The time axis expansion unit 131 realizes the time axis expansion by temporarily storing the data in the internal memory and continuously reading the data at the low frequency data rate. The time-axis expanded data is output as the output signal 132.

In the operation mode control means 112, the amount of data stored in the memory inside the time axis expansion means 131 is monitored by the remaining amount of data 115, and if it is more than a predetermined amount, the reproduction data take-in command 133 is canceled to reproduce the data. The acquisition of the signal 119 into the error correction means 120 is stopped, and the track is returned to the inner track by a track jump. Then, the standby mode by the tracking of the same track as the track jump is repeated until the amount of data stored in the memory inside the time axis expansion unit 131 becomes equal to or less than a predetermined value. When the amount of data stored in the memory inside the time axis expansion means 131 becomes less than or equal to a predetermined value and the reproducing sector comes to the sector next to the last sector which has finished the previous capturing, the data reproducing signal 119 is re-generated. Importing into the error correction means 120 is restarted.

On the other hand, the invalid sector identification signal detecting means 134.
Then, the data reproduction signal 119 is input to detect whether or not the recording signal recorded in the sector is the invalid sector identification signal described in the fourth embodiment. Originally, the defective sector itself is unreliable and cannot be used for data recording, but the invalid sector identification signal is a simple continuous repetitive recording of a special pattern that does not appear in the data, so even a part of the sector can be identified If a predetermined number of signals can be detected, it is determined to be an invalid sector, and the invalid sector detection output 135
Is output to the operation mode control means 112. The operation mode control means 112 receives the invalid sector detection output 135, cancels the reproduction data acquisition command 133, and performs error correction processing.
The output of the corrected data to the time axis expansion means 131 is stopped. By the control described above, it becomes possible to prohibit the data acquisition of the defective sector and to acquire only the data of the normal sector in chronological order. Since the reading of the output signal 132 from the time axis expansion means 131 is continuously performed during that time, as a result, the amount of data stored in the memory inside the time axis expansion means 131 decreases.
Therefore, when the number of defective sectors becomes large, it is possible to recover the memory capacity by reducing the standby mode time due to the combination of jump and tracking.

FIG. 14 is a waveform diagram showing the operation of each block of this embodiment. Sector m + 2 of data reproduction signal 119
Is a defective sector, and an invalid sector identification signal is recorded. At the present time, data up to sector m-1 has been fetched, and in this playback mode, sectors m to m + 7 are fetched. The sector to which the reproduction data fetching instruction 133 is output is fetched by the error correction means 120, subjected to error correction processing, and then output to the time axis expansion means 131 as the corrected data output 122 after a delay time of one sector. The invalid sector identification signal detection means 134 detects an invalid sector identification signal from the data reproduction signal 119 of the sector m + 2 and outputs an invalid sector detection output 135 to the operation mode control means 112. Operation mode control means 11
In No. 2, the invalid sector detection output 135 is received and the reproduction data fetching command 133 is canceled. The data reproduction signal 119 during that time is not taken into the error correction means 120, the correction process itself is stopped, and the corrected data output 122 is not output. The next sector becomes m + 3, and the invalid sector detection output 13
If 5 is released, data processing is started. Sector m +
When the data up to 7 is completed, the time axis expansion means 13
When the memory capacity in 1 reaches a predetermined value, the operation mode control means 112 outputs a track jump command 116 to the track jump control means 117 and jumps to the inner circumference of one track. After that, the standby mode in which the same track is combined with jump and tracking is repeated until the memory capacity becomes equal to or less than a predetermined value.

As described above, according to the present embodiment, at the time of reproduction, a high transfer rate can be obtained by the mode in which the reproduction data is taken in according to the data capacity stored in the memory in the time axis expansion means 131 and the standby mode in which the jump and the tracking are combined. When data is taken in and read from the memory at a low transfer rate for continuous reproduction, and when an invalid sector identification signal is recorded for a defective sector, a defect is detected by detecting the invalid sector identification signal. The data recorded in the sector can be skipped without being taken in, and the data can be reproduced in the correct time series.

[0061]

As described above, according to the present invention, the time required for detecting the presence or absence of an error in the recorded signal in the reproducing area or the recording area in the sector and the time output from the defective sector detecting means It has an axial compression means, a sector generation means, and a recording control means for outputting a processing stop or hold command to the recording means. When a defective sector is detected, recording of data to the sector is prohibited and each of the recording signals is recorded. Stop the process at the stage. If a normal sector is subsequently detected, the processing is stopped to skip the defective sector and enable highly reliable recording of a continuously input signal without data loss.

Further, the present invention has a sector address reproducing means for reproducing the sector address from the reproducing area of the optical disc as the defective sector detecting means and detecting the presence or absence of an error, and when an error occurs in the sector address in the reproducing area. , Determine that sector as a defective sector,
By recording by skipping that sector, it is possible to perform highly reliable data recording.

Further, the present invention has an error detecting means for reproducing a recorded signal from the recording area of the optical disc as the defective sector detecting means and detecting the presence or absence of an error by using the error correction code in the reproduced signal. When a signal is reproduced, error correction processing is performed in the reproduced signal, and an uncorrectable error occurs in that sector, that sector is judged as a defective sector, and that sector is skipped for recording to ensure reliability. It becomes possible to perform high data recording.

Further, the present invention has a data comparing means for reproducing a recorded sector of the optical disc as a defective sector detecting means, comparing the reproduced signal with the recorded signal, and detecting the presence / absence of mismatch, and reproduces the recorded signal. Then, the recorded signal and the reproduced signal are compared, and if a discrepancy occurs, the sector is judged as a defective sector and the sector is skipped for recording, thereby enabling highly reliable data recording. Become.

Further, according to the present invention, as the recording means, either the recording signal having the sector structure or the invalid sector identification signal indicating that the recording for the sector is invalid is recorded in the recording area, and the recording control means is provided. According to the detection result of the defective sector detection means, a processing stop or hold command is output to the time axis compression means and the sector generation means, and a recording command of an invalid sector identification signal is output to the recording means. By recording an invalid sector identification signal indicating that the recording of the sector determined to be defective is invalid, the invalid sector can be easily detected at the time of reproduction.

Further, according to the present invention, the recording time of the invalid sector identification signal is set sufficiently short with respect to one sector cycle so that the invalid sector identification signal is set shorter than the normal data recording section and the speed deviation is large. In this case, the header of the next sector can be surely detected, and the expansion of errors can be prevented.

According to the present invention, the invalid sector address storage means for storing the sector address of the sector in which the recording operation is stopped or the invalid sector identification signal is recorded, or the invalid sector number storage for counting and storing the number of invalid sectors is stored. By storing the address or number of the invalid sector having a means, the calculation of the recording data amount or recording time calculated from the recording start sector address and the end address of the recording data can be performed easily and , Can be performed with high accuracy.

The present invention also provides an invalid sector identification signal detecting means for determining whether or not the recorded data reproduced from the recording area is an invalid sector identification signal indicating that the recording is invalid, and an invalid sector identification signal. In accordance with the output of the signal detection means, the reproduction control means that outputs a processing stop or hold command to the reproduction processing means and the time axis expansion means detects an invalid sector signal in the reproduction signal and The signal processing can be stopped, and if a normal sector is subsequently detected, the processing can be stopped, so that the defective sector can be skipped and the signal can be continuously reproduced without loss.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing tracks recorded by the disk recording apparatus in the first embodiment.

FIG. 3 is an explanatory diagram showing changes in the amount of input data and the amount of recording data in the first embodiment.

FIG. 4 is a waveform diagram showing the operation of each block of the disk recording apparatus in the first embodiment.

FIG. 5 is a block diagram showing a configuration of a disk recording device according to a second embodiment of the present invention.

FIG. 6 is a waveform diagram showing the operation of each block of the disk recording apparatus in the second embodiment.

FIG. 7 is a block diagram showing a configuration of a disk recording device according to a third embodiment of the present invention.

FIG. 8 is a waveform chart showing the operation of each block of the disk recording apparatus in the third embodiment.

FIG. 9 is a block diagram showing a configuration of sector generation means in a fourth embodiment of the present invention.

FIG. 10 is an explanatory diagram showing the length of a recording command for a sector in the fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram showing an invalid sector address table according to the sixth embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a file table and an invalid sector table in the sixth embodiment.

FIG. 13 is a block diagram showing the configuration of a disc reproducing device according to a seventh embodiment of the present invention.

FIG. 14 is a waveform chart showing the operation of each block of the disk reproducing apparatus in the seventh embodiment.

FIG. 15 is a schematic diagram showing a configuration of a sector of an optical disc used in a conventional disc recording device.

[Explanation of symbols]

 101 optical disk 103 time axis compression means 105 sector generation means 107 recording means 109 optical head 112 operation mode control means 113 sector address reproduction means 117 track jump control means 120 error correction means 123 data comparison means 125 recording signal generation means 127 selector 128 invalid sector Identification signal generation means 131 Time axis expansion means 134 Invalid sector identification signal detection means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroo Oikawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] 1. A sector is composed of a recording area having a certain information recording capacity on a track formed on an optical disc and a reproducing area in which supplementary information such as a sector address is recorded in advance, and an optical head is used. An optical disc device for reproducing recorded information in the reproduction area and recording information in the recording area of the sector, comprising: time axis compression means for performing time axis compression processing on digitally encoded input data; Sector generating means for adding a synchronization signal, an error correction code, etc. to the data subjected to the time axis compression to form a sector of the recording signal, and the recording signal having the sector structure using the optical head. Recording means for recording on an optical disc, and a recorded signal in the reproduction area or the recording area in the sector Defect sector detecting means for detecting the presence or absence of an error, and recording control means for outputting a process stop or hold command to the time axis compressing means, sector generating means and recording means in accordance with the output of the defective sector detecting means. And a disc recording device provided with. 2. The defective sector detection means is a sector address reproduction means for reproducing a sector address from a reproduction area of an optical disk and detecting the presence or absence of an error.
The described disk recording device. 3. The disk according to claim 1, wherein the defective sector detecting means is an error detecting means for reproducing a recorded signal from the recording area of the optical disk and detecting the presence or absence of an error using an error correction code in the reproduced signal. Recording device. 4. The disk recording apparatus according to claim 1, wherein the defective sector detecting means is a data comparing means for reproducing the recorded sector of the optical disk, comparing the reproduced signal with the recorded signal, and detecting the presence or absence of inconsistency. 5. The recording means is configured to record either a recording signal having a sector structure or an invalid sector identification signal indicating that recording on the sector is invalid, in the recording area, and the recording control means is a defective sector. According to the detection result of the detection means, a processing stop or hold command is output to the time axis compression means and the sector generation means, and a recording command of the invalid sector identification signal is output to the recording means. The disk recording device according to claim 1. 6. The disk recording apparatus according to claim 5, wherein the recording time of the invalid sector identification signal is sufficiently short with respect to one sector period. 7. An invalid sector address storage unit for storing a sector address of a sector in which a recording operation is stopped or an invalid sector identification signal is recorded, or an invalid sector number storage unit for counting and storing the number of invalid sectors. Claim 1
Alternatively, the disk recording device according to the item 5. 8. A sector is constituted by a recording area having a constant information recording capacity on a track formed on a disc and a reproducing area in which supplementary information such as a sector address is recorded in advance, and an optical head is used. An optical disk device for reproducing the recorded information of the sector, wherein the recorded data reproduced from the recording area is separated into sync signals, and error correction processing of the reproduced signal is performed using an error correction code. Processing means, time axis expansion means for performing time axis expansion processing on the reproduction data subjected to the reproduction processing, and recorded sector data reproduced from the recording area indicating invalid sector identification. Invalid sector identification signal detecting means for determining whether the signal is a signal, and the reproduction processing according to the output of the invalid sector identification signal detecting means. Disk playback apparatus and a playback control means for outputting a stop or hold command processing on the time axis expansion means and means.