JPS60133583A - Information recording and reproducing system - Google Patents

Abstract

PURPOSE:To manage and access recored information easily by each picture unit in an optical information recording and reproducing by including a signal indicating the sector of a sector string in the leading and final sectors. CONSTITUTION:A picture information signal from an input device 510 is corrected at its error and encoded by an encoder 511, arrayed as a sector string in each fixed number bit unit and written in a sector buffer 512. A sector signal, outputs from synchronizing signal, program searching signal and address signal generating circuits 513-515 and output from a sector information signal generating circuit 516 for a signal indicating the leading sector are supplied to a write processing circuit 517, the picture information is recorded in an optical disc 501 as a sector string and the signal indicating the leading sector is included in the leading sector. In the sector recording system, the information recorded in the optical disc device of the optical information recording and reproducing device can be easily managed and accessed in each picture unit. The signal indicating the sector can be similarly included in the final sector or both the leading and final sectors.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an information recording and reproducing method, and particularly to an information recording and reproducing method that allows easy information management.

[Technical background of the invention and its problems@] In recent years, so-called optical disk devices have been attracting attention as recording M recording devices that perform high-density and extensive information recording. For example, this is done by focusing a laser beam to a diameter of about 1 μm and irradiating it onto a disk-shaped recording medium called an optical disk, forming bits with a width of 0.6 to 1 μm and a length of 1 to 2 tim on the recording medium. This is then reproduced using a similar laser beam with reduced power.

This flexible disk device has 10 to 100 times the storage capacity compared to conventional magnetic memory devices.)
l) The use of C is expanding as an electronic tool device for storing document images and still images.

In order to have versatility as a storage device, the optical disk device 4 has a recording unit consisting of a certain number of bits.
That is, recording and reproduction are performed in units of sectors.

FIG. 1 shows a conventional sector structure, in which each sector has an information signal 101 consisting of a certain number of information bits, an address signal 102 indicating the address of the sector, a cue signal 103 indicating the start of the address signal 102, and a synchronization signal 102. signal 10
It consists of 4.

As long as such a structure is adopted, and as is clear from the concept of sectors, it is only possible to access and manage one sector at a time.

This can be said to be one of the characteristics of handling data in units of sectors, but in optical disk devices that store image information, a single piece of image information is often made up of a plurality of sectors.

Therefore, when handling image information, accessing and managing only one sector is inherently inconvenient.

For example, it is necessary to hold at least the first and last addresses of a group of sectors forming a single piece of image information as management information.

[Object of the Invention] In view of the above points, the present invention provides an optical information recording and reproducing method that is versatile, allows recorded information to be searched easily, quickly and accurately, and that allows recorded information to be easily managed on an image-by-image basis. is to provide.

[Invention No. 11; also essential] In this invention, f:I:, an I'ft information signal that selects each sector from a certain number of information pits, an address signal that indicates the address of the sector, and a head that indicates the start of the wet address signal. Kushishi 7 signal, O 1: In addition to the synchronization signal, there is also a document image; I5
Z) Or, it is recorded as a series of information signals outside one still image (! It is possible to record the information signal as a series of information signals outside one frame of a still image. It is possible to overcome the above problems and achieve the object of the invention.

[Effects of the Invention] I In the present invention, the first sector or the last sector in a sequence of sectors recorded as a series of information signals such as a document image or a silent image in each sector (P-L intermediate-1-
Since the information indicating the relative position of the sector such as V1 and 111ζ is recorded, it is very easy to manage and access this information in the image.

1. Embodiment 1 of the Invention FIG. 2 shows an embodiment of the sector structure of a recording signal to which the method of the present invention is applied. Each sector is composed of an information signal 201 consisting of a fixed number of information bits, an address signal 202 indicating the address of the sector, a cue signal 203 indicating the start of the address signal 202, a synchronization signal 204, and a sector information signal 205.

In this embodiment, the sector information signal 205 is composed of 2 bits as shown in FIG. When the sector is the final sector, the lower bit is set to 111, and when the sector is the intermediate sector, both the upper and lower bits are set to K''O', that is, 1001. In addition, when the data amount of a series of recorded information signals is within the number of information bits that can be recorded in one sector, upper and lower bits are included in the sector information signal to indicate that the sector is the first sector and the last sector. 111, ie, "ii" is recorded in both.

FIG. 4 is a diagram showing a sector array on an optical disk of a series of information signals recorded in the following manner. A series of information in a document image or still image is expressed in units of a certain number of bits, 4101.4102. ~.

It is recorded on the optical disk as m sector rows of 410, n-2, 410, . . . 410 watts. Each sector has an information signal 401, an address signal 402, and a cue signal 4.
03, consists of a synchronization signal 404 and a sector information signal 405, and the core address signal 402 is Al in the order of sector column.

Al+I, A1+2, 41+In-2, A1-+
-rlt-1 and the number is incremented and recorded. The sector information signal 40 of the first sector 410 of the sector sequence is still
5 has 110'', the sector information signal 405 of the final sector 410□ has 101'', and the intermediate sectors 410□~
In the sector information signal 405 of 410㎜-, 1001 indicating that it is an intermediate sector is recorded. Further, in the sector information signal 405 of the first sector 4111 of the sector sequence in which the next series of information signals are recorded, sector information "10I" indicating that it is the first sector is again recorded. FIG. 5 shows the method of the present invention. 5 is a schematic configuration diagram of an applied optical disk device. In the figure, 501 is an optical disk as a recording medium, which is rotated by a motor 502.5
Reference numeral 03 denotes an optical system for recording and reproducing information by irradiating the optical disc 501 with a laser beam from a directly modulated semiconductor laser with a predetermined beam diameter.

During recording, a series of information signals provided from an input device 510 are guided to an encoder 511 and subjected to error correction encoding. This error correction code has redundancy, for example, by adding m check bits generated based on a predetermined rule to the bit input, and has a code length n.
(= k + m). If such encoding is performed, errors within the correction or detection capability of the error correction code can be corrected or detected by checking the mutation pattern according to the above encoding law during playback, and the system can be improved. The signal thus subjected to i%A correction encoding by the encoder 511 is stored in the sector buffer 512 in units of a fixed number of bits. Then, the synchronization signal generated by the synchronization signal generation circuit 513, the cue signal generation time M5
The cue signal and address signal generation circuit 5 generated in 14
Following the sector address generated at step 15 and the sector information signal generated at the sector information signal generation circuit 516, the encoded signal stored in the sector buffer 512 is read out to form one sector, which is then sent to the write processing circuit. 517. The write processing circuit 517 sequentially processes these applied signals and modulates the semiconductor laser by using the signal as a modulation signal. In this way, the optical disk 501 receives a synchronization signal, a cue signal, an address signal,
Sector information signal, sector single Rrt including information signal:
A series of 1i1/information signals transferred from the human-powered device 510 are optically recorded as a series of interference signals in the form of a so-called bit string.

On the other hand, during [1 playback], the optical system 503 is input from the optical disc 501 to iiT+, and the reproduced signal obtained as an electrical signal is first demodulated by the readout processing circuit 521, then the synchronization circuit 522, and the cue signal detection circuit M523. The address signal detection circuit 524 and the sector information signal detection circuit 525 separately detect the address signal and the sector information signal, and send the information signal to the sector buffer 5.
Store on 26. The signal stored in this sector buffer 526 is subjected to error detection and correction processing by a decoder 527 and is then provided to a signal output device 528.

FIG. #I6 is a schematic diagram of the operational flow when a series of information signals such as a document image or a still image is reproduced image by image according to the method of the present invention. When reproducing information, although it is not written in the main text, the system only instructs the sector address at which to start reproducing.

Accordingly, the optical disc device moves the optical system 503 in the radial direction to the position on the optical disc 501 where the designated sector is recorded, and plays back the sector without performing focus or tracking control. access the selected sector. When the designated sector address is detected, a check is then made to see if the sector information signal is the first sector of a sector string in which a series of information signals are recorded. I representing the sector information signal trap first sector
When a 1Xw times signal is being recorded, the information signal stored in the sector pad 7a 526 is transferred to the output device 528 [7, Sector 1/ is used as a noise signal to represent the final sector j = 1Xl The signal is reproduced up to the sector where the signal is recorded and the information signal continues to be transferred to the Yamao device 528.Also, if the 11X1 signal representing the first sector is not recorded in the sector information signal of the designated sector, the system The read address is determined to be incorrect, an error flag is set, and the playback operation is terminated.

As described above, according to the present invention, by recording sector information signals such as the first sector, middle sector, and last sector in a sector sequence in which a series of information signals such as document images or still images are recorded in each sector, recording is possible. By simply specifying the address of the first sector of the image, it is possible to reproduce the image in units of images, making it easy to control the reproduction. In addition, since one image can be specified only by the address of the first sector, management of recorded images becomes extremely easy.

In addition, in order to improve the reliability of the memory device, it is necessary to detect whether or not the light reflected from the optical disk is small during pit recording.
640) When an uncorrectable defect is detected, there is a method in which a reject signal is recorded in that sector, the sector address is counted up, and an information signal of the defective sector is recorded in the next sector position. Even in this case, by recording a sector information signal in each sector, there is no need to manage and manage defective sectors that occur when recording a series of information signals on an optical disk, and the management of recorded images is extremely difficult as described above. Easy to press.

Further, as described in the present invention, by checking whether the 01X signal representing the leading sector is recorded in the sector information signal of the designated sector, the reliability of the reproduced image can be improved.

It goes without saying that in the present invention, it is also possible to reproduce information signals in units of sectors, as in the prior art.

[Other Embodiments of the Invention] In the embodiments described above, the three yuzu signals representing the first sector, middle sector, and last sector were used as sector information signals, but this is not limited to signals representing either the first sector or the last sector. You can also get the same effect. Furthermore, the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways such as the sector structure, sector information signals, etc. In short, the present invention can be implemented in various forms without departing from the gist of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a sector structure employed in conventional magnetic disks and optical disk devices, FIG. 2 is a diagram showing a sector structure of a recording signal according to the present invention, and FIG. 3 is a diagram showing sector information according to the present invention. FIG. 4 is a diagram showing a signal configuration, FIG. 4 is a diagram showing a sector sequence of a recording signal recorded on an optical disk according to the present invention, and FIG. 5 is a diagram showing an optical disk device to which the information recording/reproducing method according to the present invention is applied. FIG. 6 is a schematic diagram of the operational flow for reproducing a series of information signals such as document images or still images image by image using the method of the present invention. (201)...Information signal, (202)...Address signal. (205)...Sector information signal 0

Claims (1)

[Claims] (In a method of recording an information signal on a recording medium sector by sector, the first sector of a sequence of sectors in which the information signal is recorded includes a first sector signal indicating that it is the first sector. (2) When the information amount of the information signal is equivalent to one sector, the last sector of the sector string in which the information signal is recorded is the last sector of the series of information. , one or both of the last sector signals, (3) When the information amount of the information signal is equivalent to three sectors or more, the first sector of the sector sequence in which the series of information signals are recorded, and the middle excluding the last sector. (4) The information signal is a continuous sector system on the recording medium. (5) The reproduction of the information signal recorded on the recording medium is recorded in the sector. Claims 1 to 4 are characterized in that the information signal is transmitted in units of the information signal using an address signal and a first sector signal, or an address signal and a last sector signal, or an address signal, a first sector signal, and a last sector signal. (6) The information recording and reproducing method according to Claims 1 to 5, characterized in that the recording medium is disk-shaped, and information is recorded and reproduced optically by irradiation with a laser beam. information recording and reproducing method.