JPS62137767A - Disk type recording carrier - Google Patents

Abstract

PURPOSE:To avoid the disturbance of the primary information caused by the discontinuation at a joint part of the additional description in a reproduction mode, by recording the primary information after a prescribed pattern is recorded for a fixed period of time at the start of recording and then recording a prescribed pattern for a fixed period of time after the primary information is recorded at the end of recording respectively. CONSTITUTION:A fixed pattern is produced by a fixed pattern generating circuit block 22 at the end of recording of the audio signal at a preceding time point of a joint part, i.e., at an end time point of recording. This pattern is selected by a selecting circuit block 23 and written to a disk 27 after undergoing the addition of an error correction code and the interleave as well as the modulation. Then the signals sent from the block 22 are selected by the block 23 and recorded in the same way prior to the recording at a time point after the joint part, i.e., at a starting time point of the additional description. Then the block 23 selects the digital signals sent from an A/D converting block 21 and records them to the disk 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disc-shaped record carrier for recording and reproducing audio information, video information, etc.

2. Description of the Related Art Disk-shaped record carriers are often used for recording and reproducing audio information, video information, etc.

The compact disc, which is one of the conventional disk-shaped record carriers, will be explained below with reference to the drawings. FIG. 3 shows a description of a conventional disc-shaped record carrier. Fig. 2 is a construction/reproduction block diagram. In FIG. 3, 31 is an A/D conversion block, 32
is an error correction coding block, 33 is an interleave operation block, 34 is an EFM modification block, 35 is a disk, 36 is an EFM demodulation block, 37 is an error correction decoding block, 38 is a deinterleave operation block,
39 is a D/A conversion block.

In FIG. 3, an analog audio signal is digitized by an A/D conversion block 31, an error correction code is added by an error correction encoding block 32, and at the same time, the data sequence is rearranged by an interleave operation block 33. After that, EFM modulation block 34
A modulation operation is performed and recorded on the disk 35. Conversely, during playback, the signal read from the disk 35 is
The EFM demodulation block 36 demodulates the data, the de-interleave operation block 38 rearranges the data, and at the same time, the error correction decoding block 37 decodes the data. will be returned to. Since the data series on the disk are interleaved, their order is discontinuous. (For example, ``Digital Audio No. 1, co-authored by Toshitada Doi and Akira Iga, Radio Gijutsusha).

Problems to be Solved by the Invention However, with the above configuration, there is no problem when recording and reproducing normally, but when adding or changing information,
Since the main information becomes discontinuous at the connecting part, there is a problem in that the information becomes disordered at that part.

In view of the above-mentioned problems, the present invention provides a disc-shaped record carrier that eliminates abnormal phenomena caused by discontinuity of information at the transition point between additional writing and modification when a write-once or rewritable medium is used. It is something to do.

Means for Solving the Problems The disc-shaped record carrier of the present invention for solving the above problems is as follows:
It is a recordable or rewritable disc-shaped record carrier that records and reproduces information in a spiral manner, and at the start of recording, the main information is recorded after recording a predetermined pattern for a certain period of time, and at the end of recording, the main information is recorded. A predetermined pattern is recorded for a certain period of time after the information has been recorded. In addition, the non-signal information of the main information is used as a predetermined pattern, and an error correction code is used as a means for detecting disturbances in the information at the joint portion of the additional information, and if the disturbance at the joint portion of the main information is detected, error compensation is performed. It was made so that it could also be done.

Effects of the present invention With the above-described configuration, the predetermined pattern before and after is continuous at the transition portion during additional writing or rewriting, so no disturbance occurs during playback, and when no-signal information is recorded before and after,
Even if a disturbance occurs in the information at the joint, it is detected by the error correction code and error compensation is performed, so that the recorded non-signal information can be reliably reproduced. Therefore, abnormal phenomena due to disturbances in the connecting portions are prevented.

EXAMPLE Hereinafter, a disc-shaped record carrier according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a signal recording state at a recording junction in a disc-shaped record carrier according to an embodiment of the present invention. In FIG. 1, reference numeral 11 indicates a fixed pattern recording portion before the joint, 12 a fixed pattern recording portion after the joint, and 13 a normal signal recording portion. Second
The figure is a recording/reproducing block diagram of a disc-shaped record carrier according to an embodiment of the present invention. In FIG. 2, 21 is an A/D conversion block, 22 is a constant pattern generation circuit block, and 23 is an A/D conversion block.
24 is an error correction encoding block, 25 is an interleave operation block, 26 is an EFM modulation block, 27 is a disk, and 28 is an EFM demodulation block. , 29 is an error correction decoding block,
210 is a de-interleave operation block, 211 is a constant pattern detection circuit block, 212 is a D/A conversion block, and 213 is a mute circuit block.

During normal recording, digital data that has been A/D converted by the A/D conversion block 21 is selected by the selection circuit block 23, and is manually input to the error correction encoding block 24 where an error correction code is attached. , is interleaved in an interleaving operation block 25, and is modulated in an EFM modulation block 26 before being recorded on a disk 27. During playback, the EFM demodulation block 28 demodulates the data, and the error correction decoding block 29 . The signal is subjected to error correction and deinterleaving by a deinterleave operation block 210, converted to an analog audio signal by a D/A conversion block 212, and outputted through a mute circuit block 213. At this time, mute is not applied.

Next, recording and reproducing of the transition portion during additional writing or rewriting will be explained with reference to FIGS. 1 and 2. At the point before the transition, that is, at the end of recording, after the recording of the audio signal is completed, a constant pattern is generated by the constant pattern generation circuit block 22, which is generated by the selection circuit block 2.
3, and is subjected to addition of an error correction code and interleaving, then modulated and written to the disk 27 (
(Part 11 in Figure 1), the generation time of this constant pattern is set to be longer than the time required for interleaving to be resolved (approximately 15 ms for compact discs).Next, at the point after the splice, that is, the start point of additional writing, Prior to recording, the signal from the constant pattern generation circuit block 22 is selected by the selection circuit block 23 and recorded in the same manner (12 in FIG.
part).

The time for this constant pattern to occur is also set to be longer than the time for interleaving to be resolved. After that, the selection circuit pro 7ri 23
A digital signal from the D conversion block 21 is selected and recorded on the disk 27.

When playing back the disc 27 on which the joint portions have been recorded in this way, the EFM demodulation block 28 demodulates the disc 27 in FIG. be done. A constant pattern detection circuit block 211 monitors data when error correction is performed, and if a constant pattern written in a joint portion during recording is detected for a certain period of time (for example, a time corresponding to the time when interleaving is solved), a mute circuit is activated. generating a mute signal in block 213, during which the audio signal is therefore muted;
Therefore, no abnormality occurs at the connecting portion.

Furthermore, if no signal is recorded as a fixed pattern recorded at the joint, there is no need to mute the joint since there is no signal to begin with. Furthermore, even if errors occur at the joints due to synchronization disturbances, etc., they are detected by the error correction decoding block 29 and the errors are compensated for, so that no signals recorded at the joints can be reliably reproduced. .

Effects of the Invention As described above, the present invention is a recordable or rewritable disk-shaped record carrier that records and reproduces main information such as audio information and video information in a spiral manner. After recording a predetermined pattern for a certain period of time, the main information is recorded, and at the end of recording, by recording a predetermined pattern for a certain period of time after the recording of the main information is finished, the main information in the transition portion of additional recording is avoided during playback. It makes it possible to eliminate disturbances caused by continuity, and also uses non-signal information of the main information as a predetermined pattern, and uses an error correction code as a means of detecting disturbances of information at the joints of additional notes, to detect disturbances at the joints of the main information. If so, by performing error compensation, it is possible to reliably reproduce the non-signal information in the joint portion and prevent abnormal phenomena due to disturbances in the joint portion.

[Brief explanation of drawings]

FIG. 1 is a +U diagram showing a signal recording state at a recording junction in a disk-shaped record carrier according to an embodiment of the present invention, and FIG. 2 is a recording/reproduction diagram of a disk-shaped record carrier according to an embodiment of the present invention. Block Diagram FIG. 3 is a recording/reproducing block diagram of a compact disc, which is one of the conventional disk-shaped disc type 78 discs. 11... Fixed pattern recording portion before the joint, 12... Fixed pattern recording portion after the joining, 13... Normal signal recording portion, 21...
... A/D conversion block, 22 ... Constant pattern generation circuit block, 23 ... Selection circuit block, 24 ... Error correction coding block, 25
...Interleave operation block, 26...
... EFM modulation block, 27 ... disk, 28 ... EFM demodulation block, 29 ...
...Error correction decoding block, 210...De...
Interleaving operation block, 211... Constant pattern detection circuit block, 212... D/A
Conversion block, 213...Mute circuit block, 31...A/D conversion block, 32...
...Error correction coding block, 33...Interleave operation block, 34...E F M
a m circumference block, 35...disc, 3
6...E F M return B round block, 37...
... Error correction decoding block, 38 ... De-interleave operation block, 39 ... D/
A conversion block. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 1 Figure 2

Claims (2)

[Claims] (1) A recordable or rewritable disc-shaped record carrier that records and reproduces information in a spiral pattern, and at the start of recording,
After recording a predetermined pattern for a certain period of time, the main information is recorded, and at the end of the recording, by recording the predetermined pattern for a certain period of time after the recording of the main information is finished, the main information of the additionally recorded transition part is recorded during playback. A disc-shaped record carrier characterized by eliminating disturbances caused by discontinuities. (2) A disk-shaped record carrier that uses non-signal information of the main information as a predetermined pattern and uses an error correction code as a means for detecting disturbances of information at the joints of additional writing, which detects disturbances at the joints of the main information. 2. The disk-shaped record carrier according to claim 1, wherein when detected, error compensation is performed to ensure that the non-signal information in the joint portion can be reproduced.