JPS63220480A - Disk-shaped recording carrier - Google Patents

Abstract

PURPOSE:To easily perform addition and change, by providing a recording area separation layer for distinction between the signals of a main channel and a subchannel. CONSTITUTION:The recording area separation layer 12 which performs the recording and reproduction of the main channel and the subchannel along grooves cut with prescribed pitches spirally from an inner periphery to an outer periphery, and distincts the signals of the main channel and the subchannel is provided. The recording area separation layer 12 is formed by recording a prescribed pattern for a prescribed time after completing recording. And the detection of the layer is performed by reproducing the prescribed pattern for the prescribed time, or the distinction of a recording signal is performed by forming the layer by changing the record of a prescribed recording signal pattern or the reflectance of a disk-shaped recording carrier 10 in advance and detecting the change of the recording signal pattern or reflected light from the disk-shaped recording carrier 10. In such a way, it is possible to detect a recording position at the time of adding or rewriting by the recording area separation layer 12, and to perform the retrieval of the recording signal by the recording area separation layer 12.

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. 4 is a recording/reproducing block diagram of a conventional disk-shaped record carrier. In FIG. 4, 41 is an A/D conversion block, 42 is an error correction coding block, 43 is an interleaving operation block, 44 is an EFM modulation block, 45 is a disk, 4
6 is an EFM demodulation block, 47 is an error correction decoding block, 48 is a deinterleave operation block, and 49 is a D
/A conversion block.

In FIG. 4, an analog audio signal is digitized by an A/D conversion block 41, an error correction code is added by an error correction encoding block 42, and at the same time, the data sequence is rearranged by an interleave operation block 43. After that, EFM modulation block 44
A modulation operation is performed and recorded on the disk 45. Conversely, during playback, the signal read from the disk 45 is
The EFM demodulation block 46 demodulates the data, the de-interleave operation block 48 rearranges the data, and at the same time, the error correction decoding block 47 decodes the data. will be returned to. Since the data series on the disk are interleaved, their order is discontinuous. (For example, ``Digital Audio J'' co-authored by Toshitada Doi and Akira Iga, Radio Gijutsusha).

Problems to be Solved by the Invention However, with the above configuration, although there is no problem when recording and reproducing normally, no consideration has been given to the recording method when adding or changing information. This has the problem of destroying recorded tracks or making it difficult to search for recorded signals.

In view of the above-mentioned problems, the present invention provides a disk-shaped record carrier on which additional writing and changes can be easily performed when a write-once or rewritable medium is used.

Means for Solving the Problems The disc-shaped record carrier of the present invention for solving the above problems is as follows:
It has a groove spirally cut at a constant pitch from the inner circumference to the outer circumference, and several main channels and sub channels are recorded and reproduced along the groove, and each of the recorded signals of the main channel and sub channel is recorded. A recording area separation layer is provided for differentiation, and the recording area separation layer is formed by recording a playback pattern for a certain period of time after the end of recording, and the detection thereof is performed by playing back the predetermined pattern for a certain period of time. Alternatively, a certain recording signal pattern may be recorded in advance or the reflectance of the disc-shaped record carrier may be changed to change the recording signal pattern or the reflected light from the disc-shaped record carrier during reproduction. It is designed to detect and distinguish recorded signals.

According to the present invention, with the above-described configuration, the recording position during additional writing or rewriting can be detected by the recording area separation layer, and the recording signal can be searched by the recording area separation layer.

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 on a disc-shaped record carrier according to an embodiment of the present invention.

In FIG. 1, 10 is a disc-shaped record carrier, 1) is a signal recording area portion, and 12 is a recording area separation layer. FIG. 2 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;
2 is a constant pattern generation circuit block, 23 is a selection circuit block that selects the outputs of the A/D conversion block 21 and the constant pattern generation circuit block 22, 24 is an error correction encoding block, 25 is an interleaving operation block, and 26 is a modulation block. , 10 is a disc-shaped record carrier, 2 is a demodulation block, 29 is an error correction decoding block, 210 is a de-interleave operation block, 21) is a constant pattern detection circuit block, 212 is a D/A conversion block, 213 is a This is a mute circuit block.

In normal recording, digital data A/D converted by an A/D conversion block 21 is selected by a selection circuit block 23, inputted to an error correction encoding block 24, where an error correction code is added, and at the same time, the digital data is interleaved. After being interleaved in the operation block 25 and modulated in the modulation block 26, the signals are recorded on the disc-shaped record carrier 10. For reproduction, the signal is demodulated by the demodulation block 28, subjected to error correction and deinterleaving by the error correction decoding block 29 and deinterleave operation block 210, converted to an analog signal by the D/A converter 212, and then sent to the mute circuit. It is output through block 213. Note that the main channel consists of, for example, audio information and video information, and the subchannel consists of, for example, address information.

Next, recording and reproduction during additional writing or rewriting will be explained with reference to FIGS. 1 and 2. At the end point of recording, after the end of recording, a fixed pattern is generated by the fixed pattern generation circuit block 22, which is selected by the selection circuit block 23, subjected to addition of an error correction code and interleaving, and then modulated and disk-shaped recording. It is scraped into the carrier 10 (
1) recording area separation layer portion). The time required for this constant pattern to occur is set to be longer than the time required for several revolutions of the disc-shaped record carrier 10. During additional recording, this constant pattern is searched for from the outer circumference toward the inner circumference, and after detection, recording is continued.

Reproduction of the disc-shaped record carrier 10 recorded in this manner is as follows:
In FIG. 2, demodulation is performed in two demodulation blocks, and error correction and deinterleaving are performed by an error correction decoding block 29 and a deinterleaving operation block 210. The fixed pattern detection circuit block 21) monitors data when error correction is performed, and mutes the data if it detects a fixed pattern written in at the joint during recording for a fixed period of time (e.g., a time corresponding to when interleaving is solved). The circuit block 213 is caused to generate a mute signal. Therefore, the reproduced signal is muted during that time, and no abnormality occurs at the joint. When a certain pattern ends, muting is canceled. Furthermore, if no signal is recorded as a fixed pattern to be recorded at the end of recording, there is no need to mute at the transition section 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.

The search is made possible by detecting the recording area separation layer 12 on the disc-shaped record carrier 10 and determining the relative position of the recorded signal. For example, the third recording signal from the inner circumference can be determined by detecting the recording area separation N1) three times from the inner circumference.

Next, regarding the disc-shaped record carrier of the second embodiment of the present invention,
This will be explained with reference to the drawings. FIG. 3 is a diagram showing a signal recording state on a disc-shaped record carrier according to a second embodiment of the present invention. In FIG. 3, 30 is a disk-shaped recording body, 31 is a signal recording area portion, and 32 is a recording area separation layer.

In FIG. 3, a recording area bone M layer 32 is previously formed on the disc-shaped recording carrier 30. As shown in FIG. This may be formed, for example, by a fixed pattern of recording signals, or if the disk-shaped record carrier 30 records and reproduces information using optical properties, the reflectance of light may be determined by adjusting the reflectance of the signal to the signal recording area 31. It may be formed differently. The recording area separation layer 32 is formed concentrically on the disc-shaped recording carrier 30 at appropriate intervals.

After the recording area separation layer 32 is detected, recording is started from the position where it ended. The search may be performed using the fact that the relative position of the recording signal can be determined by finding the position of the recording area separation layer 32.

Effects of the Invention As described above, the disc-shaped record carrier of the present invention has a groove spirally cut at a constant pitch from the inner circumference to the outer circumference, and several main channels and sub channels are formed along the groove. The recording area separation layer is characterized in that a recording area separation layer is provided to distinguish between the main channel and sub-channel signals to be recorded and reproduced, and the recording area separation layer keeps a predetermined pattern for a certain period of time after recording is completed. The detection is performed by reproducing the predetermined pattern for a certain period of time, or by recording a predetermined recording signal pattern in advance or by changing the reflectance of the disc-shaped record carrier, and then detecting the predetermined pattern by reproducing the predetermined pattern for a certain period of time. In some cases, recording signals are distinguished by detecting changes in the recording signal pattern or reflected light from the disc-shaped record carrier, so the recording position at the time of additional writing or rewriting is detected by the recording area separation layer. Furthermore, the recording signal can be searched using the recording area separation layer.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a signal recording state of a disc-shaped record carrier according to an embodiment of the present invention shown in FIG. , FIG. 3 is a configuration diagram showing a signal recording state of a disc-shaped record carrier according to a second embodiment of the present invention, and FIG. 4 is a diagram showing a recording state of a compact disc, which is one of the conventional disc-shaped record carriers. - It is a reproduction block diagram. 10... Disc-shaped record carrier, 1)... Signal recording area, 12... Recording area separation layer, 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.
... Modulation block, 27 ... Disc-shaped record carrier, 28 ... Demodulation block, 29 ...
・Error correction decoding block, 210... De-interleaving operation block, 21)... Constant pattern detection circuit block, 212... D/A conversion block, 213... ... Mute circuit block, 30 ... Disc-shaped record carrier, 31 ...
Signal recording area, 32...Recording area separation layer, 41
...A/D conversion block, 42...Error correction coding block, 43...Interleaving operation block, 44...EFM modulation block, 45... ... Disk, 46. Old EFM demodulation block, 47.. Error correction decoding block,
48... De-interleave operation block, 4
9...D/A conversion block. Name of agent Patent attorney Nakayashikio Haka1 List 1 Figure 10 - Disk-shaped record carrier 1) - Signal recording area Figure 3

Claims (5)

[Claims] (1) It has a groove spirally cut at a constant pitch from the inner circumference to the outer circumference, and several main channels and sub channels are recorded and reproduced along the groove, and the recorded signals of the main channel and sub channel are recorded. 1. A recordable or rewritable disk-shaped record carrier, characterized in that a recordable area separation layer is provided for distinguishing between the following. (2) The recording area separation layer is formed by recording a predetermined pattern for a certain period of time after the end of recording, and the detection thereof is performed by reproducing the predetermined pattern for a certain period of time. The disc-shaped record carrier according to item (1). (3) The disk-shaped record carrier according to claim (1), wherein the recording area separation layer is formed in advance at arbitrary intervals. (4) The recording area separation layer is formed by a certain recording signal pattern, detects the recording signal pattern during reproduction, and
A disc-shaped record carrier according to claim (3), characterized in that recording signals are distinguished. (5) The recording area separation layer is formed by changing the reflectance of the disc-shaped record carrier, and the detection thereof is based on a change in reflected light from the record carrier. disc-shaped record carrier.