JPS60258766A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To output surely a reproduced sequence end signal in the unit of sector by using in common the method detecting a data mark and calculating a reproduction end signal and a method obtaining the reproduction end signal through the detection of a sector mark. CONSTITUTION:In calculating the reproduction end signal 26 from a recorded data, the reproduction end signal 26 is outputted after the reproduction of a recorded data and a reproduction enable signal 27 representing the process of reproduction is brought into the OFF state from the ON state. When the reproduction enable signal 27 is keeping the ON state even after the reproduction of the recorded data, however, the sector mark S is detected and a sector identification signal 28 is obtained, the sector recognizing signal 28 is regarded as the reproduction end signal and the reproduction enable signal 27 is brought into the OFF state. Erroneous propagation and data reproduction stop at the next sector caused when one sector reproduction end signal is not outputted are prevented by generating the sector reproduction end signal in such a way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an original information recording and reproducing apparatus for recording and reproducing information on an optical recording disk having a sector structure in which a guide track is divided into a plurality of areas.

Conventional configuration and its problems As an optical information recording/reproducing device, for example, an optical recording disk coated or vapor-deposited with a photosensitive material is rotated, and a beam of light from a laser light source is projected onto the disk surface with a diameter of 1 μm.
By irradiating a minute spot light focused on the following and modulating its optical output intensity with a recording signal, video can be created in real time as optical changes such as phase changes due to unevenness or changes in reflectance and transmittance on the optical recording disk. There are devices that can record information such as signals and digital signals, and can reproduce the recorded information by detecting changes in the optical characteristics.

In such devices, due to the high density of recording tracks, discrete partial writing, erasing, etc.
Concentric, optically detectable guide tracks on the rack
Alternatively, an optical system is provided in advance in a spiral shape, and a well-known tracking control is applied so that a minute spot light generated by a laser follows the guide track, and information is recorded on a predetermined track and information is reproduced from the track. A digital information recording device can be considered.

When recording digital information whose data length is variable, the track is divided into multiple areas (sectors) and information is recorded and played back in sector units in order to use the recording area efficiently. There is. A conventional data recording format is shown in FIG. Each sector is composed of a synchronization signal 1 for synchronization pull-in of a self-regenerating clock generation circuit, a data start identification signal 2 (hereinafter abbreviated as data mark) for identifying the start of data, and a data section 3.

As shown in FIG. 2, a block B of a sector in which a synchronization signal 1, a data mark 2, and a data section 3 are concatenated is divided into sectors from a sector identification signal S for identifying the beginning of a sector to a next sector identification signal S (hereinafter referred to as It is inserted and recorded in the period up to (abbreviated as sector mark).

The sector mark S is preformatted with a specific bit pattern that can be identified as data to be recorded or a sector address that indicates the address of the sector.

When reading data recorded on an optical recording disk, if no data mark is detected, the subsequent data portion becomes invalid. A possible method for reducing such loss is a frame structure in which one sector is further divided into a plurality of information recording units (frames). FIG. 3 shows an example of a frame structure recording format. Each frame F is composed of a data mark 2 and a data section 3 for identifying the beginning of data. One sector recording signal block B is composed of a synchronization signal and a plurality of frames F.

A common method for outputting a signal indicating the end of a data reproduction sequence is to use data recorded on an optical recording disk and calculate a reproduction end signal from the data. For example, there is a method of counting the number of data marks and outputting a reproduction end signal when a set number is reached. However, if some data marks cannot be detected, the playback end signal is not output at the predetermined position, and 1
The reproduction sequence of seven sectors will not be completed and will affect the reproduction of the next sector.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an original information recording and reproducing device that reliably outputs a reproduction sequence end signal in sector units during data reproduction of sector recording signals on an 8AFi optical recording disk.

Composition of the Invention The present invention is capable of detecting a sector mark that is preformatted on an optical recording disk and used to identify the beginning of a sector when reproducing data in a sector consisting of a synchronization signal, a data mark, and a data section. , generates a data reproduction end signal for the previous sector.

Description of examples Examples of the present invention will be described below.

An example of the optical recording disk used in the present invention is shown in FIG. 4. The optical recording disk 4 has a sector area 5 for recording information consisting of 81 to SN, a sector area 5 consisting of Sm1 to SoN, and a sector area 5 for recording address information. It consists of mark 6. Information recording and reproduction is performed sector by sector.

Clock pulses for self-clock reproduction can be easily extracted from the data actually recorded on the optical recording disk. In addition, the data is modulated according to a certain conversion algorithm for the purpose of making the signal form suitable for the recording medium.

When attempting to reproduce data in a certain sector, in order to extract and demodulate only the data part of the recorded signal, data marks are detected from the binary signal after waveform equalization.
Demodulation of data begins at that timing.

FIG. 5 shows a block diagram of data reproduction. The reproduced signal 8 taken out from the photodetector 7 is passed through an amplifier 9 and a waveform equalizer 10.
, a binary reproduction signal 12 passes through a comparator 11. This binary reproduction signal 12 is transmitted to the sector mark detection circuit 1.
The binarized reproduction signal is sequentially shifted in a shift register 16 in accordance with the clock pulse 15 which is added to the clock pulse 15 and extracted by the clock reproduction circuit 14 . Data mark detection circuit 1
7, if a certain focus pattern is detected,
A data mark detection signal 18 is output. Further, a sector mark is detected by the sector mark detection circuit 12, and a sector mark detection signal 19 is output. With this data mark detection signal 18 and sector mark detection signal 19,
The reproduction gate signal 2o and the reproduction timing clock signal 21 are transmitted to the reproduction gate timing clock generation circuit 22.
The demodulated data 24 demodulated by the demodulation circuit 23 is written into the sector buffer memory 25 using these signals, and the capture of one sector of reproduced data is completed.

When data reproduction is performed in units of sectors, this embodiment detects and counts data marks, which are recorded data, as a means to obtain a sector reproduction end signal indicating where the reproduction data has been captured. As a result, a method of calculating a reproduction end signal and a method of obtaining a reproduction end signal by detecting a sector mark are used in combination.

Hereinafter, a method for obtaining a reproduction end signal in this embodiment will be explained.

The sector mark S is pre-format l- on the guide track.
(Figure 6-a).

Professional consisting of synchronization signal, data mark and data section,
The mark B is inserted and recorded between the sector mark S and the next sector mark s-1 (FIG. 6 = b). When calculating the reproduction end signal 26 from the recorded data, the reproduction end signal 26 is output after the recorded data is reproduced (Fig. 6-c).
), the reproduction enable signal 27 indicating that reproduction is in progress changes from the ON state to the OFF state (FIG. 6-d). However, the reproduction enable signal 27 remains ON even after the recorded data is reproduced.
If the state continues to be maintained, the sector recognition signal 28 is detected by detecting the sector mark S and obtaining the sector recognition signal 28.
is regarded as a reproduction end signal, the reproduction enable signal 27 is turned off, and the reproduction sequence of one sector is completed (FIG. 6-f).

By generating the sector playback end signal using this method, even if there is an error such as a burst error in the data in the sector recorded on the optical recording disk and the playback end signal is not output at a predetermined position, the optical recording disk By detecting pre-formatted sector marks,
A sector reproduction end signal is output, and a method of outputting a sector reproduction end signal from recorded data is supported.

Effects of the Invention When reproducing data recorded on an optical recording disk, the present invention not only calculates from the recorded data and outputs a reproduction end signal, but also calculates the reproduction end signal by detecting sector marks preformatted on the optical recording disk. By providing the optical information recording and reproducing apparatus with a circuit that outputs a reproduction end signal for one sector, the reproduction sequence for one sector is always completed. This makes it possible to prevent error propagation in the next sector, data reproduction stop, etc. that would occur if a reproduction end signal for one sector is not output, and has a great practical effect.

[Brief explanation of drawings]

Figure 1 is a format diagram showing an example of a conventional recording format, Figure 2 is a layout diagram showing the positions of sector marks and recording blocks, and Figure 3 is a format diagram showing an example of a frame-structured data recording format. , FIG. 4 is a pattern diagram showing an example of an optical recording disk, FIG. 5 is a block diagram of data reproduction, and FIG. 6 is a time chart diagram showing an example of reproduction of one sector. 4... Optical recording disk, ε... Sector area, 6-... Sector mark, 7... Photodetector, 13
... Sector mark detection circuit, 17 - Data mark detection circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure B Figure 2 Figure 3 Figure 4 Rice bran Figure 6

Claims (3)

[Claims] (1) A means for recording and reproducing data in a sector of an optical recording disk having an optically detectable guide track and in which the guide track is divided into a plurality of sectors, and a means for recording and reproducing data from the data recorded in each sector. a first means for obtaining a reproduction end signal of the sector; and a second means for obtaining a sector identification signal for identifying the sector preformatted on the optical recording disk; 1. An optical information recording/reproducing apparatus characterized in that a sector reproduction end signal is obtained by using the above means in combination. (2) The optical information recording/reproducing apparatus 0 according to claim 1, wherein the sector identification signal is composed of a specific bit pattern that can be identified from the data to be recorded. (3) The original information recording/reproducing apparatus according to claim 1, wherein the sector identification signal has a sector address indicating the address of the sector.