JPH06195878A - Optical disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To detect an erroneously recorded part and to perform error correction at the time of reproduction even when the erroneous recording of data is executed due to the generation of e.g. track jumping, etc., at the time of recording a writable optical disk. CONSTITUTION:Data added with the error correction signs are scrambled by means of a scrambling circuit 16, recorded on an optical disk D and error correction is performed after the reproduced signal from the optical disk D is descrambled by a de-scrambling circuit 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording / reproducing apparatus for recording / reproducing data on / from an optical disc.

[0002]

2. Description of the Related Art In a conventional so-called CD-ROM format, for example, a signal obtained by scrambling data and then modulating is used as a signal on an optical disk for the purpose of reducing low-frequency components of the signal. Has been done. As a result, it is possible to obtain a good reproduction signal with a low frequency component even in a CD-ROM having a large amount of fixed data.

In contrast to the read-only optical disc such as the CD-ROM, there is a rewritable optical disc such as a magneto-optical disc. Here, for example, as shown in FIG. 4, on the rewritable optical disc D, recording tracks TR are arranged in a spiral shape, and data of a block B composed of a plurality of frames is recorded on the recording tracks TR. become. The recording is performed at a constant linear velocity, for example.

An optical disk recording / reproducing apparatus for recording and reproducing a signal on such a rewritable optical disk has a head that moves in the radial direction of the optical disk, and the head scans on the rotating optical disk. By doing so, the signal is recorded and reproduced.

Here, in the reproducing system of the optical disk recording / reproducing apparatus, for example, a so-called doubled Reed-Solomon code is usually used as an error correction code. Here, C1 of the Duplex Reed-Solomon code is subjected to relatively short interleaving, and C2 is subjected to relatively long interleaving. Furthermore,
In the reproducing system, in order to improve the correction capability, so-called erasure correction is performed by referring to the correction result in C1 in C2.

[0006]

By the way, the head for recording and reproducing data on the rewritable optical disc is usually not in contact with the optical disc. Therefore, when data is recorded on the optical disc, a track jump may occur due to disturbance or the like.

Therefore, in the above-mentioned conventional optical disc recording / reproducing apparatus, if a track jump or the like occurs during recording of data on the optical disc as described above, the optical disc is rotated, and therefore, for example, Data may be recorded on another block different from the block on which the data is to be recorded. That is, it is possible that data is recorded or rewritten (overwritten) on the other block, for example, over several frames (for example, about 10 msec). The data of the above-mentioned several frame valve itself is normal and can be read.

Therefore, in the above-mentioned conventional optical disc recording / reproducing apparatus, when data of several frames is erroneously recorded in another block by the track jump as described above, the data of several frames itself is normal. Therefore, the short interleaved C1 correction may hardly be detected as an error. That is, in the other blocks, errors may not be detected even though erroneous recording is performed. On the other hand, the interleaving of C2 is, for example, about 1.5 blocks (about 50 ms).
Therefore, in the C2 correction, erroneous recording for several frames due to the track jump is almost always detected as an error. Therefore, if the erasure correction is performed at C2 on the basis of the correction result indicating that there is no error at C1, the possibility of erroneous correction at C2 becomes extremely high.

In the optical disc recording / reproducing apparatus,
As a method for surely determining that a track jump has occurred during data recording on an optical disc on the side of the device,
For example, there is a method of determining whether or not the addresses such as absolute addresses premastered on the disc are discontinuous. However, it is not realistic to frequently put the address such as the absolute address on the optical disc, and since an error is included, it takes some times of the frequency to read it reliably, therefore, The above method is not preferable because it takes time to make a judgment.

Therefore, the present invention has been proposed in view of the above situation, and is different from a block which should be originally recorded due to, for example, a track jump occurring at the time of recording on a rewritable optical disk. Provided is an optical disc recording / reproducing apparatus capable of detecting the erroneously recorded portion and correcting the error when reproducing the optical disc even if data is recorded in the block. That is the purpose.

[0011]

The optical disk recording / reproducing apparatus of the present invention has been proposed in order to achieve the above-mentioned object, and scans the above-mentioned optical disk in which a head moving in the radial direction of the optical disk rotates. An optical disk recording / reproducing apparatus for recording and reproducing data by using an error correction code adding means for adding an error correction code to the data recorded on the optical disk, and a scramble means for scrambling the data to which the error correction code is added. And whether or not the reproduction data is correct data by using the descrambling means for descrambling the signal reproduced by the head from the optical disc, and the reproduction data and the reproduction error correction code obtained by the descramble means. Error correction means for determining the error The recording error due to rack jump is obtained so as to detect the recording detecting unit erroneously constituted by the said descrambling means and said error correction means.

Here, the scramble means performs the scramble processing in block units of, for example, about 33 msec, and the descramble means also performs the descramble processing in block units. Further, the erroneous recording detection unit including the descrambler and the error corrector can detect the erroneous recording due to the track jump and also perform the error correction.

[0013]

According to the optical disk recording / reproducing apparatus of the present invention, since the data to be recorded on the optical disk is scrambled, even if, for example, several frames of data are erroneously recorded in a block, If this optical disk is reproduced and descrambled, error correction is possible.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an optical disk recording / reproducing apparatus of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an optical disc recording / reproducing apparatus of this embodiment, and FIG. 2 shows a format of data recorded on an optical disc D of this embodiment.

That is, as shown in FIG. 1, the optical disk recording / reproducing apparatus of this embodiment scans data on the optical disk D by rotating a head (not shown) moving in the radial direction of the optical disk D. It is a rewritable optical disk recording / reproducing apparatus for recording and reproducing. Here, the recording system 10 of the recording / reproducing apparatus is provided with C2 as an error correction code adding means for adding an error correction code to the data supplied through the input terminal 11 for recording on the optical disc D.
An encoder 12, an interleave circuit 13, a C1 encoder 14, an interleave circuit 15, and a scramble circuit 16 for scrambling the data to which the error correction code is added by the error correction code adding means are arranged. Further, the reproducing system 30 uses the descrambling circuit 33 for descrambling the signal reproduced by the head from the optical disc D, and the reproducing data and reproducing error correction code obtained by the descramble circuit 33 for the reproducing operation. A deinterleave circuit 34, a C1 decoder 35, a deinterleave circuit 36, and a C2 decoder 37 as error correction means for determining whether the data is correct data and performing error correction are arranged. In the recording / reproducing apparatus, an erroneous recording due to a track jump at the time of recording the data is detected by the erroneous recording detecting section composed of the descramble 33 and the error correcting means, and the error is corrected and output from the output terminal 38. I am trying to output.

First, in FIG. 1, for example, the audio data supplied to the input terminal 11 is subjected to the so-called doubled Reed-Solomon code C2, which is the above-mentioned C.
2 is sent to the encoder 12. The C2 encoder 12
Then, the parity of the Reed-Solomon code of C2 is added. The data to which the parity is added is sent to the interleave circuit 13, and the interleave circuit 13 performs an interleave process for changing the order of the data. The output of the interleave circuit 13 is sent to the C1 encoder 14, and the C1 encoder 14 adds the parity of the Reed-Solomon code of C1. The output of the C1 encoder 14 is further interleaved by the interleave circuit 15 and then sent to the scramble circuit 16.

In the scramble circuit 16, about 33 m
A process of scrambling the data is performed for each block of sec. The scrambling range is a range of data after the data frame shown in FIG. 2 described later and before (2,7) modulation in the modulation circuit 17 described later other than the frame sync and Resync. The scramble process is preset for each block.

Here, the scramble data generation polynomial by the scramble circuit 16 is as follows. That is, in order to secure randomness, the scrambling cycle may be longer than the number of scrambling data. Here, for example, in FIG.
(Frame address 1 byte + audio data 60 bytes + AUX data 6 bytes + C1 parity 6 bytes +
The C2 parity is 6 bytes) × the number of data frames is 98 frames = 7742 bytes. Therefore, in this embodiment,
For example, from 2 ¹³ = 8192, a primitive polynomial of degree 13 or higher is required.

P (x) = X ¹⁴ + X ¹⁰ + X ⁶ + X + 1
(Cycle 2 ¹⁴ -1)

The data subjected to the scramble processing as described above is subjected to, for example, (2,7) modulation by the modulation circuit 17, and then sent to a head (not shown) through a terminal 18, and the head causes the data to be processed as described above. It is recorded on the optical disc D.

A signal is reproduced from the optical disk D by the head, and the signal from the head is demodulated by the demodulation circuit 32 for demodulating the (2,7) modulated signal through the terminal 31 of the reproduction system 30 of the apparatus. Sent to. The demodulation circuit 32
Then, the data obtained by demodulating the (2,7) modulation is sent to a descramble circuit for performing a process opposite to the scramble process in the scramble circuit 16 of the recording system 10 to descramble the scramble. . The output of the descrambling circuit 33 is deinterleaved by the deinterleave circuit 34 which performs the reverse processing of the interleaving processing by the interleave circuit 15, and the C1 decoder 35
Sent to. The C1 decoder 35 mainly corrects random errors and sets the C1 pointer flag. The output of the C1 decoder 35 (including the C1 pointer flag) is sent to the deinterleave circuit 36. The deinterleave circuit 36 performs a process reverse to the process in the interleave circuit 13, and the data (including the C1 pointer flag) subjected to the deinterleave process is the C2 decoder 3
Sent to 7. In the C2 decoder 37, the burst error is mainly corrected by using the C1 pointer flag. The output of the C2 decoder 37 is the output terminal 3
8 is reproduced as reproduction data of the optical disc D.

In the reproducing system 30 of the optical disc recording / reproducing apparatus, the components after the descramble circuit 33 operate based on the timing signal generated by detecting the sync signal.

Next, in the data format of this embodiment shown in FIG. 2, one block consists of 6 preamble frames, 98 frame data frames, and 1 frame.
The frame consists of a postamble frame.

Here, one frame of the preamble frame is a 34-bit amble frame sync AFS, a 2-bit "0", a 1-byte frame address, a 3-byte block address, and a 2-byte frame in the recording direction. CRC, 21-byte PLL (phase-locked loop) pull-in 0-data (2, 7) modulation repetition data RP, 22-bit Resync, 1-byte frame address, 3-byte block address, 2-byte CRC, It is composed of 20 bytes of the data RP, 22 bits of Resync, 1 byte of the frame address, 3 bytes of the block address, 2 bytes of CRC, and 20 bytes of the data RP. Note that each frame address of this preamble frame indicates 80h to 85h of time information (for example, minutes, seconds, frames).

One frame of the above-mentioned data frame is also a 34-bit data frame sync and a 2-bit MD status flag (however, part C
There is a frame that becomes RC or "0" data), 1-byte frame address, 26-byte audio / AU
X data, 22-bit Resync, 10-byte audio / AUX data, 6-byte C2 parity, 1
It is composed of 0 burst of audio / AUX data, 22 bits of Resync, 20 bytes of audio / AUX data, and 6 bytes of C1 parity. Each frame address of this data frame indicates 00h to 61h of the time information.

One frame of the postamble frame is also a 34-bit amble frame sync AFS, 2-bit "0", 1-byte frame address, 3-byte block address, 2-byte CRC in the recording direction. , 21 bytes 0 for pulling in the PLL
Repeated data RP of (2,7) modulation of data, 22-bit Resync, 1-byte frame address, 3
Byte block address, 2-byte CRC, 20-byte data RP, 22-bit Resync, 1
It is composed of a frame address of bytes, a block address of 3 bytes, a CRC of 2 bytes, and the data RP of 20 bytes. Each frame address of this postamble frame indicates 86h of the above time information.

Further, in the data format, C1 is applied to the frame address, audio / AUX data, and C2 parity in the data frame, and audio / AUX in the C2H data frame.
It is designed to be applied only to data.

FIG. 3 shows a specific example of the scramble circuit 16. The scramble circuit of FIG. 3 includes 14 flip-flops 50 ₁ to 50 ₁₄ and Ex-OR (exclusive OR) gates 51 to 54, and each of the flip-flops 50 ₁ to 50 ₁₄ is An Ex-OR gate 51 is provided between the flip-flops 50 ₁ and 50 ₂ while being cascade-connected, and an Ex-OR gate 52 is provided between the flip-flops 50 ₆ and 50 _7. An Ex-OR gate 53 is provided between 50 ₁₀ and the flip-flop 50 ₁₁ . The Ex-OR gates 51, 52, 5
3, the output from the previous stage flip-flop is supplied to one input terminal, and the output of the flip-flop 50 ₁₄ is supplied to the other input terminal.
The outputs of the Ex-OR gates 51, 52 and 53 are
Each is sent to a flip-flop in the subsequent stage.

Further, each of the flip-flops 50 ₁ to 50 ₁₄
Operates according to the byte clock from the terminal 61 and is preset by a preset signal (for example, all “1”) from the terminal 60. Also, the flip-flops 50 ₁ , 50 ₂ , 50 ₃ , 50 ₄ , 50 ₅ , 5
Each of the outputs 0 ₆ , 50 ₇ , and 50 ₈ has an Ex-OR gate 5
4 to one of the input terminals.

By supplying the data supplied from the terminal 62 (the output of the interleave circuit 15 of FIG. 1) to the other input terminal of the Ex-OR gate 54,
The data at the terminal 62 can be interleaved, and the interleaved data is sent from the terminal 63 to the modulation circuit 17 in FIG.

Although a concrete example of the scramble circuit 36 shown in FIG. 1 is omitted, the configuration is the reverse of that shown in FIG.

Further, as the scramble circuit 36, it is possible to use a ROM or the like which outputs a random signal according to input data.

As described above, in the optical disk recording / reproducing apparatus of the present embodiment, first, the randomness of the (2,7) modulated signal pattern is increased to reduce the low frequency component, and secondly, the optical disk D is used. In order to make it possible to recognize as an error by C1 correction when the data written in the incorrect position due to the track jump during recording to, is scrambled for every 33 msec block, for example. ing. By scrambling the data for each block in this way, even if you accidentally record data in the middle of a block, it is possible to slightly shift it from the position in the originally recorded block. For example, when it is descrambled during playback, it will be descrambled to data that is completely different from the original signal. Therefore, the erroneously recorded portion is more likely to be reliably judged as an error in both C1 and C2, and erasure correction can be performed correctly. Therefore, in the erasure correction of the C2 decoding of the above-mentioned mistakenly recorded portion, the probability of erroneous correction can be greatly reduced.

Further, the optical disc recording / reproducing apparatus of this embodiment can reduce the low frequency component of the signal as in the conventional case.

[0035]

As described above, in the optical disc recording / reproducing apparatus of the present invention, the data to which the error correction code is added is scrambled and recorded on the optical disc, and the signal reproduced from the optical disc is descrambled and then the error correction is performed. By doing so, even if, for example, a track jump occurs when recording a rewritable optical disc and data is recorded in another block of the optical disc, the portion that was erroneously recorded is reproduced when the optical disc is reproduced. In addition to being able to detect, it is possible to correct errors.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a data format of this embodiment.

FIG. 3 is a block diagram showing a specific example of a scramble circuit of the present embodiment.

FIG. 4 is a diagram showing tracks and blocks on an optical disc.

[Explanation of symbols]

 12 ... C2 encoder 13, 15 ... interleave circuit 14 ... C1 encoder 16 ... scramble circuit 17 ... modulation circuit 32 ... demodulation circuit 33 ... descramble Circuits 34, 35 ... Deinterleave circuit 35 ... C1 decoder 37 ... C2 decoder D ... Optical disk

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 6, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Therefore, in the above-mentioned conventional optical disc recording / reproducing apparatus, if a track jump or the like occurs while recording data on the optical disc as described above,
Since the optical disc is rotating, for example, data may be recorded on another block different from the block on which the data is to be recorded. That is, it is possible that data is recorded or rewritten (overwritten) on the other block, for example, over several frames (for example, about 10 msec). Data itself of the number of frames is normal and is capable of reading.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

First, referring to FIG. 1, the input terminal 11
The audio data supplied to the C2 encoder 12 is sent to the C2 encoder 12 that performs C2 encoding of a so-called dual Reed-Solomon code. The C2 encoder 1
2, the parity of C2 Reed-Solomon code is added. The data to which the parity is added is sent to the interleave circuit 13, and the interleave circuit 13 performs an interleave process for changing the order of the data. The output of the interleave circuit 13 is sent to the C1 encoder 14, and the C1 encoder 14 outputs C
One Reed-Solomon code parity is added. The output of the C1 encoder 14 is further interleaved by the interleave circuit 15 and then sent to the scramble circuit 16.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Further, in the data format, C1 is applied to the frame address in the data frame, audio / AUX data and C2 parity, and C2 is applied to the audio / AUX in the data frame.
It is designed to be applied only to data.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

Further, each of the flip-flops 50 ₁ to 50
₁₄ operates in response to the byte clock from the terminal 61 and is preset by a preset signal (for example, all "1") from the terminal 60. Also,
Flip-flops 50 ₁ , 50 ₂ , 50 ₃ , 50 ₄ , 5
Each output of 0 ₅ , 50 ₆ , 50 ₇ , and 50 ₈ is 8 Ex
It is adapted to be sent to one input terminal of the OR gate 54.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Here, the data supplied from the terminal 62 to the other input terminal of the Ex-OR gate 54 (see FIG. 1).
(The output of the interleave circuit 15) is supplied, the data of the terminal 62 is scrambled , and the scrambled data is sent from the terminal 63 to the modulation circuit 17 of FIG.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

Although a specific example of the scramble circuit 36 in FIG. 1 is omitted, the configuration is the reverse of that in FIG. The descramble circuit 33 of FIG. 1 is also the same as that of FIG.
It has the same structure.

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiji Hirai Inventor Keiji Hirai 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (1)

[Claims] 1. An optical disc recording / reproducing apparatus for scanning and recording data on the optical disc, wherein a head that moves in the radial direction of the optical disc rotates, to add an error correction code to the data to be recorded on the optical disc. Correction code adding means, scrambling means for scrambling the data to which the error correction code is added, descrambling means for descrambling the signal reproduced by the head from the optical disk, and reproduction obtained by the descramble means. The data descrambler and the reproduction error correction code are used to judge whether or not the reproduction data is correct data, and an error correction means for performing error correction is provided, and erroneous recording due to a track jump at the time of recording the data is descrambled. Error detection composed of means and the error correction means Optical disc recording and reproducing apparatus characterized by detecting by.