JPH0773600A - Method and device for optical recording/reproducing and optical recording medium - Google Patents

Abstract

PURPOSE:To secure a recording area as much as possible by setting error detecting and correcting capability corresponding to the information in accordance with kinds of information to be recorded. CONSTITUTION:When a sign string expressing information to be recorded is inputted to an input section 6, the signal is branched to an error detecting and correcting circuit 5 and an information kinds discriminating means 8, the means 8 discriminates whether a kind of information is code information in the signal or continuous information, and this discriminated information is sent to a redundancy factor setting means 7. The means 7 sets an appropriate redundancy factor for the circuit 5 in accordance with the discriminated information. After the sign string expressing information to be recorded is converted to 'sign string having the prescribed redundancy factor' by the circuit 5, and modulated to variation of a driving current of a laser beam by a modulating means 4. A beam modulated to variation of beam strength is emitted from a light source of a laser beam and an irradiating optical system unit 3 to a magnetooptical disk 1, and recording is performed by action of its heat and recording magnetic field.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing method, an optical recording / reproducing apparatus and an optical recording medium.

[0002]

2. Description of the Related Art Optical recording, which can store information at a high density, is expected to become popular as a method for realizing a large capacity memory. Among optical recording media, an optical disk is particularly attracting attention as an external memory of a computer because it can realize a high transfer rate. While various optical discs and their recording / reproducing devices have been proposed due to the difference in information storage method and size, what is standardized by the ISO standard is that the size of 5.25 inches is
A write-once type that can be written only once, a rewritable type that can be repeatedly rewritten, and a 3.5-inch diameter size, a read-only type, a rewrite type, and a partial ROM that mixes a read-only type and a rewrite type. There is something called. These are expected to become even more widely marketed in the future. Recently, in the digital audio field, CD-Rs (write-once discs of the same size as CDs) and MDs (minidiscs: 2.5-inch diameter, with read-only and rewritable types) have appeared. Therefore, it is expected to spread in the future.

Except for the read-only type, these optical disks have a concave or convex groove as a guide for arranging marks to be recorded by a laser beam of a recording / reproducing apparatus in an orderly and high density, that is, for tracking. The disk is spirally formed from the inner circumference to the outer circumference. This groove is called a guide groove. According to the definition of the ISO standard, the guide groove is called a land when a concave portion, that is, a distant portion when viewed from the incident side of the laser beam, and a convex portion, which is a near portion. Information is recorded on either lands or grooves. Recording on a land is called a land recording method, and recording on a groove is called a groove recording method. The zone where information is recorded is called a track. The distance from the center of a track to the center of the adjacent track is called the track pitch.

Information to be recorded is previously converted into a binary signal of 0 and 1 (this signal is called a bit). In accordance with this binary signal, information units are recorded in dots on the track. The information unit is an island-shaped protrusion or a depression (also called a pit) in a read-only type such as an LD or a CD, a depression (also called a pit) in a write-once type, and an optical characteristic of a track whose ground is a rewritable type. It is an area called a mark (also called a bit) different from the part.

The information unit recorded on the track corresponds to one of 0 and 1 of the binary signal. Actually, the ground portion of the track surface corresponds to either 0 or 1,
The information unit recorded on the track corresponds to the other. The information to be recorded consists of a matrix of 0, 1 binary signals,
This matrix of 0s and 1s is called a code string. By the way, if there is a defect such as a scratch or dust on the track, an error may occur because the information unit is not completely formed in that part. The types of errors are roughly classified into random errors in which errors in information units occur discretely and burst errors in which errors occur concentrated in a certain range of a code string.

Since the optical disc has a very high recording density,
Compared to other media having a low recording density, it is relatively susceptible to minute defects, and many random errors and burst errors occur. Therefore, it is essential to perform error detection / correction processing, and various error detection / correction processing methods have been proposed so far. The simplest method of error detection
There is a parity check. To briefly explain this method, first, a code string representing the information to be recorded has a predetermined number of binary signals (number of bits), for example, if this is 3, 000/0 every 3 bits.
Divide like 01/010/111 etc. and make this division an information word. Extra 1 in information word for parity check
A new information word is created by adding more parity bits than this bit and this information word is recorded. parity·
The number of bits is determined so that the total number of bits of "1" in the new information word is an even number, so that the occurrence of an error can be checked by counting the number of "1". However, this method is simple but low in power, and is only used as a supplement for optical recording.

In optical recording / reproducing, a method called Reed-Solomon code, which is an error detecting / correcting process having higher capability, is generally adopted. This Reed-Solomon code combines a parity word (word composed of parity bits) calculated according to a certain convention with an information word to form a new information word. It features high efficiency and a high degree of freedom in setting correction capability and information word length. Furthermore, by using interleaving together, burst errors can be sufficiently resolved.

Interleaving is a method of converting a burst error into a random error by dividing a code string into units of bits or information words as shown in FIG. 6, rearranging the order and recording. . The Reed-Solomon code is originally a random error detection / correction code,
By using interleaving together, sufficient detection / correction capability can be shown even for burst errors.

In the error detection / correction processing, the ratio of the code sequence added to the code sequence representing the information to be recorded to the entire "code sequence" after the addition is called redundancy. By the way, examples of information to be recorded on the optical recording medium include continuity information typified by audio, moving images, and still images, and code information such as characters and numbers. Since voices and images are information that has temporal or spatial continuity,
Even if a part of it is lost, it can be restored based on the information before and after. On the other hand, since code information such as characters and numbers has no temporal or spatial continuity, if an error occurs in a part of the code information, it will be transformed into another information. In order to make such a situation less likely to occur at the time of recording or reproducing code information, for example, in an optical disc, the error rate when error detection / correction processing is not performed is usually 10 ⁻⁴ to 10 ^−6, which is relatively large. However, the error rate is made as small as 10 ⁻¹² to 10 ⁻¹³ by performing error detection / correction processing. Therefore, high capability is required for error detection / correction processing. In other words, this means that a large degree of redundancy is required. However, in the case of voice or image information, the error rate need not be so low.

If the redundancy in the error detection / correction process is increased, the error detection / correction capability is generally improved, but it goes without saying that the amount of information that can be stored in the recording area is only the redundant bits or redundant words. Decrease.

[0011]

Conventionally, in the error detection / correction processing in optical recording and reproduction, a code which requires the highest error detection / correction processing so as to deal with any kind of information. Great redundancy was adopted according to the information. Therefore, although continuity information such as images and sounds requires a larger amount of information than code information, information that can be recorded by performing error detection / correction processing with excessive capacity for these items. There was a problem that the amount was reduced more than necessary. The object of the present invention is to solve this problem.

[0012]

As a result of earnest research for solving this problem, the present inventors first discriminate or instruct (input) the type of information, and select an appropriate type corresponding to the type of information. The inventors have found that the above problems can be solved by setting the redundancy, and have completed the present invention. Therefore, in the first aspect of the present invention, “the code string representing the information to be recorded is detected as
Correcting process "converts into a" code string with a predetermined degree of redundancy "and irradiates an optical recording medium that is moving relative to the beam while modulating the laser beam according to this" code string " In the optical recording method for recording information, by setting the redundancy corresponding to the type of the information, the recording method is provided.
Second, "the input part of the code string representing the information to be recorded, and the" error detection / correction "for converting the code string into the" code string having a predetermined redundancy "by" error detection / correction processing " Processing circuit ", laser beam light source, modulation means for modulating the intensity of the laser beam according to the" code string ", irradiation optical system for guiding the beam from the light source to an optical recording medium, and the medium relative to the beam. In the optical recording device including a moving unit that moves the information, the information type determining unit that determines the type of the information and outputs the type information, and the redundancy corresponding to the type information from the determining unit is "error detection". A recording device characterized by adding redundancy setting means for setting to the "correction processing circuit", and thirdly, "the input part of the code string representing the information to be recorded, the code string" Error detection / correction "Error detection / correction processing circuit" for converting into a "code string having a predetermined redundancy" by means of "processing", a laser beam light source, a modulation means for modulating the intensity of the laser beam according to the "code string", An optical recording apparatus comprising: an irradiation optical system for guiding a beam from the light source to an optical recording medium; and a moving means for moving the medium relative to the beam, wherein type information indicating a type of the information is input. A record having two input sections and redundancy setting means for setting the redundancy corresponding to the type information inputted from the second input section to the "error detection / correction processing circuit". Device, and fourthly, "input part of code string representing information to be recorded, converted to" code string with predetermined redundancy "by" error detection / correction processing "of the code string. "Error detection Correction processing circuit ",
Laser beam light source, modulation means for modulating the intensity of the laser beam according to the "code sequence", irradiation optical system for guiding the beam from the light source to an optical recording medium, and moving the medium relative to the beam. An optical recording device comprising a moving means, further comprising a third input section for inputting the redundancy degree.
To "an optical recording medium characterized in that, in addition to the information, type information indicating the type of information or redundancy is recorded", and sixth, "the code string indicating the information to be recorded is" error detection ".・ "Code sequence with predetermined redundancy" by "correction process"
By irradiating a laser beam on the optical recording medium converted and recorded to read the "code string", by returning to the original code string by the "error detection / correction process",
In the reproducing method of optical recording for reproducing information, type information indicating the type of information or the redundancy is recorded on the medium, and the redundancy information corresponding to the read type information is used for the error detection / detection. And a moving means for moving the optical recording medium relative to the laser beam.
A laser beam light source, an irradiation optical system for guiding the laser beam to the medium, a demodulation means for receiving a beam transmitted through the medium or a beam reflected by the medium and demodulating into a "code string having a predetermined redundancy". A reproduction optical system for guiding the beam transmitted through the medium or the beam reflected by the medium to the demodulation means, and the "code string having a predetermined redundancy" reproduced by the demodulation means In an optical recording / reproducing apparatus comprising an "error detection / correction processing circuit" for converting a recorded information itself into a code string representing the recorded information, and an output unit of the code string representing the information to be recorded. Type information reading means for reading "type information representing the type of information" recorded on the medium, and the redundancy corresponding to the type information from the reading means are set for the "error detection / correction processing circuit". Eighth, "recording device characterized by adding redundancy setting means", and eighthly, "moving means for moving the optical recording medium relative to the laser beam, a laser beam light source, and the laser beam Irradiation optical system for guiding the medium, demodulation means for receiving the beam transmitted through the medium or the beam reflected by the medium and demodulating into a "code string having a predetermined redundancy", the beam transmitted through the medium or the above A reproduction optical system for guiding the beam reflected by the medium to the demodulation means, and a "code string having a predetermined redundancy" reproduced by the demodulation means are recorded based on the predetermined redundancy. Predetermined redundancy recorded on the medium in an optical recording / reproducing apparatus including an "error detection / correction processing circuit" for converting into a code string representing the information itself, and an output unit of the code string representing the information itself to be recorded. Read, the information reproducing apparatus characterized by the addition of redundancy reading means for setting for the "error detection and correction processing circuit""
I will provide a.

[0013]

The present invention is roughly classified into recording and reproduction. In the record,
The information to be recorded is divided into a case where it has type information indicating the type of information and a case where it does not have type information. In the former case, the information type determining means of claim 2 determines the type of information. In the latter case, the operator of the recording device inputs the type information or redundancy to the second or third input section of the device according to claim 3 or 4 before recording. In the latter case, the type information or redundancy may or may not be recorded on the optical recording medium. When recorded, an optical recording medium in which the type information or redundancy is recorded (claim 5) is obtained.

In reproduction, the type information or the redundancy used for recording is recorded on the optical recording medium, so that it is first read. Then, a code string having a predetermined redundancy is read, the code is decoded based on the predetermined redundancy, and the original recorded information is output. Therefore, in the reproducing apparatus, the type information reading unit for reading the type information and the redundancy setting unit for setting the predetermined redundancy based on the read type information,
Alternatively, a redundancy reading means for reading the predetermined redundancy of claim 8 is added. The original code string is decoded based on the predetermined redundancy from these means.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

[0016]

[Embodiment 1] This embodiment is that of a recording apparatus according to claim 2, and this apparatus mainly comprises a motor 2 for rotating a magneto-optical disk 1, a laser beam light source and an irradiation optical system unit as shown in FIG. 3, modulation means 4, error detection / correction processing circuit 5, information input section 6, redundancy setting means
It is composed of 7 and information type discriminating means 8 and functions as follows.

When a code string representing the information to be recorded is input to the input unit 6, the signal is branched to the error detection / correction processing circuit 5 and the information type discriminating means 8, and the information type discriminating means 8 outputs the signal in the signal. The type is discriminated by the portion indicating the type of information, which is code information or continuity information, and this discrimination information is sent to the redundancy setting means 7. The redundancy setting means 7 sets an appropriate redundancy for the error detection / correction processing circuit 5 according to the discrimination information. The code string representing the information to be recorded is converted into a "code string having a predetermined redundancy" by the detection / correction processing circuit 5 and then modulated by the modulation means 4 to change the driving current of the laser beam. From the laser beam light source and irradiation optical system unit 3, a beam whose shape is changed into intensity change is emitted to the magneto-optical disk 1, and recording is performed by the action of the heat and the recording magnetic field.

[0018]

[Embodiment 2] This embodiment is the same as that of the recording apparatus according to claim 3, and as shown in FIG. 2, this apparatus mainly comprises a motor 2 for rotating the magneto-optical disk 1, a laser beam light source and an irradiation optical system unit. 3, modulation means 4, error detection / correction processing circuit 5, information input section 6, redundancy setting means
It is composed of 7 and the second input section 9 for inputting the type of information, and functions as follows.

First, when type information representing code information or continuity information is input to the second input section 9 in advance, the redundancy setting means 7 performs error detection / correction processing on an appropriate redundancy according to the information. Set for circuit 5. The code string representing the information to be recorded is converted into a "code string having a predetermined redundancy" by the detection / correction processing circuit 5 and then modulated by the modulation means 4 to change the driving current of the laser beam. From the laser beam light source and irradiation optical system unit 3, a beam whose shape is changed into intensity change is emitted to the magneto-optical disk 1, and recording is performed by the action of the heat and the recording magnetic field.

[0020]

[Embodiment 3] This embodiment is the same as that of the recording apparatus according to claim 4, and as shown in FIG. 3, this apparatus mainly comprises a motor 2 for rotating the magneto-optical disk 1, a laser beam light source and an irradiation optical system unit. It is composed of 3, a modulation means 4, an error detection / correction processing circuit 5, an information input section 6, and a third input section 10 for inputting redundancy, and functions as follows.

First, when the redundancy suitable for either code information or continuity information is input to the third input section 10 in advance, the redundancy is set for the error detection / correction processing circuit 5. The code string representing the information to be recorded is converted into a "code string having a predetermined redundancy" by the detection / correction processing circuit 5 and then modulated by the modulation means 4 to change the driving current of the laser beam. From the laser beam light source and the irradiation optical system unit 3, a beam whose intensity is changed is emitted to the magneto-optical disk 1, and recording is performed by the action of the heat and the recording magnetic field.

[0022]

[Embodiment 4] This embodiment is the same as that of the recording apparatus according to claim 7, and as shown in FIG. 4, this apparatus mainly comprises a motor 2 for rotating the magneto-optical disk 1, a laser beam light source, and irradiation / reproduction optics. The system unit 13, the demodulation means 14, the error detection / correction processing circuit 15, the output section 16 for outputting the reproduced information, the type information reading means 17, and the redundancy setting means 18 function as follows.

When a beam of reproduction level intensity is emitted from the laser beam source and irradiation / reproduction optical system unit 13 to the magneto-optical disk 1 on which information to be recorded is recorded, the intensity signal of the reflected light is transmitted to the unit 13. Incident. The signal converted into the current change form by the detector incorporated in the unit 13 is output to the demodulation means 14 and demodulated into a code string representing information from the current change form, and the error detection / correction processing circuit 15 and the type It is output to the information reading means 17.
The type information reading means 17 selectively reads only the part representing the type of information and outputs it to the redundancy setting means 18, where the redundancy according to the type of information is given to the error detection / correction processing circuit 15. Is set. The error detection / correction processing circuit 15 removes the “predetermined redundancy” part from the “code sequence having a predetermined redundancy” and outputs the code sequence representing information from the output unit 16 for reproduction.

[0024]

[Embodiment 5] This embodiment is the same as that of the recording apparatus according to claim 8, and as shown in FIG. 5, this apparatus mainly comprises a motor 2 for rotating the magneto-optical disk 1, a laser beam light source and an irradiation optical system, and Reproduction optical system 13, demodulation means 14, error detection / correction processing circuit 15, output section for outputting reproduced information
It is composed of 16 and redundancy reading means 19, and functions as follows.

When a beam of reproduction level intensity is emitted from the laser beam light source and irradiation / reproduction optical system unit 13 onto the magneto-optical disk 1 on which information to be recorded is recorded, the intensity signal of the reflected light is transmitted to the unit 13. Incident. The signal converted into the form of current change by the detector incorporated in this unit 13 is output to the demodulation means 14, demodulated into a code string representing information from the form of current change, and redundant with the error detection / correction processing circuit 15. It is output toward the reading means 19. The redundancy reading means 19 selectively reads only the portion representing the redundancy and sets it in the error detection / correction processing circuit 15. The error detection / correction processing circuit 15 removes a predetermined redundancy part from the "code string having a predetermined redundancy" and outputs a code string representing information from the output section 16 for reproduction.

In the first to fifth embodiments described above, the redundancy setting means 7
Sets the degree of redundancy for performing standard processing of the ISO standard (hereinafter referred to as processing 1) in the case of code information, and in the case of continuity information such as voice and image, processing with a smaller degree of redundancy than the standard processing of the ISO standard ( Hereinafter, the redundancy for performing the process 2) is set. This has the same basic configuration as the redundancy setting means 18.

Here, the process 1 is as follows. That is, the information is subjected to error detection / correction processing with 1200 bytes as one unit. The breakdown of 1200 bytes is a recording capacity of information itself of 1024 bytes, a defect management pointer of 12 bytes, CRC (Cyclic Redundancy Check) data of 4 bytes as an error detection code, and error correction code data of 160 bytes.
CRC data 4 bytes and error correction code data 1
A total of 164 bytes of 60 bytes is the redundant part. The data structure is shown in FIG. These are expanded into a two-dimensional matrix with 120 columns and 10 rows and interleaved. Of course, Reed-Solomon code is used as the error correction code.

The process 2 refers to the setting of redundancy as shown below. That is, as a breakdown of 1200 bytes, the recording capacity of the information itself is 1104 bytes, the defect management pointer is 12 bytes, and the CRC is
The data is 4 bytes and the error correction code data is 80 bytes.
Therefore, in this case, a total of 84 bytes of 4 bytes of CRC data and 80 bytes of error correction code data is a redundant portion. The data structure is shown in FIG.

[0029]

[Sixth Embodiment] An unrecorded I is recorded in the recording apparatus of the first embodiment (FIG. 1).
The SO standard 130 mm rewritable magneto-optical disk 1 was set. First, for recording, type information representing code information and an M-sequence signal that was regarded as code information were input to the input unit of the recording device, and recording was performed with a laser beam intensity optimum for recording on this optical disk. Next, the optical disk on which this recording was performed was set in the reproducing apparatus (FIG. 4) of Example 7, reproduction was carried out with the laser beam intensity optimum for reproduction, and the average error rate was measured. The result was 3.4 × 10 ^-13 , and it was proved that the information type discriminating means and the redundancy setting means of the recording device and the type information reading means of the reproducing device functioned properly, and the process 1 was performed. .

Next, the optical disk is set again in the recording apparatus of the embodiment 1 and all the above M-sequence signals are erased.
Type information representing continuity information and an M-sequence signal that was regarded as continuity information were input to the input section, and recording was performed with the optimum laser beam intensity for recording on this optical disc. Next, the optical disk on which this recording was performed was set in the reproducing apparatus of Example 7, and reproduction was performed with the laser beam intensity optimum for reproduction, and the average error rate was measured. The result was 7.5 × 10 ^-9 , which shows that the error detection / correction capability was clearly lower than when recorded as code information. That is, when the type of the input information is changed to the continuity information, the information type discriminating unit and the redundancy setting unit of the recording device and the type information reading unit of the reproducing device properly function, and the process 2 is performed. Proved.

As described above, in the case of continuity information such as voice and image, the error rate becomes relatively higher than that in the case of code information, as can be seen from the comparison between FIG. 7 and FIG. Is 13.7% in the case of code information, while it is as small as 7% in the case of continuity information.
Along with this, the recording capacity of the information itself is 1,024 bytes in the case of code information per 1200 bytes, whereas it is 1,104 bytes in the case of continuity information, which is about 8%.
You can see that there are many. Therefore, by setting the redundancy of the error detection / correction processing corresponding to the continuity information, a larger recording capacity is secured.

[0032]

[Seventh Embodiment] An unrecorded I is recorded in the recording apparatus of the second embodiment (FIG. 2).
The SO standard 130 mm rewritable magneto-optical disk 1 was set. For recording, the operator inputs in advance the type information representing the code information into the second input section, and subsequently inputs the M-sequence signal used as the code information into the input section, and the optimum laser beam intensity for recording on this optical disc is obtained. Recorded in. Next, Example 7
The optical disk on which this recording was performed was set in the reproducing apparatus of No. 1 and reproduction was also performed at the laser beam intensity optimum for reproduction of this optical disk, and the average error rate was measured. The result was 3.3 × 10 ⁻¹³ , which was almost the same as in Example 1.

Next, using the recording apparatus of the second embodiment again, after all the above signals have been erased, type information representing continuity information is input to the second input section, and subsequently the continuity information is input to the input section. The M-series signal, which was assumed to be, was input, and recording was performed with the optimum laser beam intensity for recording on this optical disk. Next, the optical disk on which this recording was performed was set in the reproducing apparatus of Example 7, and reproduction was performed with the laser beam intensity optimum for reproduction,
The average error rate was measured. The result is 7.6 × 10 ^-9 , which is an error detection / compared to when recorded as code information.
It can be seen that the correction ability has obviously decreased. That is, it is understood that the same effect as in the case of Example 1 was obtained.

[0034]

[Embodiment 8] I that has not been recorded in the recording apparatus of Embodiment 3 (Fig. 3).
The SO standard 130 mm rewritable magneto-optical disk 1 was set. For the recording, the operator inputs the redundancy for performing the process 1 in advance to the third input section, and subsequently inputs the M-sequence signal used as the code information into the input section, and the optimum laser for recording on this optical disc. The beam intensity was recorded. Next, Example 8
The optical disk on which the recording was performed was set in the reproducing apparatus (FIG. 5), and the average error rate was measured by performing reproduction with the laser beam intensity optimum for reproducing the optical disk. The result was 3.4 × 10 ⁻¹³ , which was almost the same as in Example 1.

Next, using the recording apparatus of the third embodiment again, after all the above signals are erased, the redundancy for performing the process 2 is input to the third input section, and subsequently the continuity is input to the input section. An M-series signal, which was used as information, was input, and recording was performed with a laser beam intensity optimum for recording on this optical disc. Next, the optical disk on which this recording was performed was set in the reproducing apparatus of Example 7, and reproduction was performed with the laser beam intensity optimum for reproduction,
The average error rate was measured. The result is 7.6 × 10 ^-9 , which is an error detection / compared to when recorded as code information.
It can be seen that the correction ability has obviously decreased. That is, it is understood that the same effect as in the case of Example 1 was obtained.

[0036]

According to the present invention, according to the type of information,
Since error detection / correction processing suitable for the information is performed, a large recording capacity can be obtained with a practical error rate.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating an overall configuration of an optical recording device according to a first embodiment (claim 2) of the present invention.

FIG. 2 is a block diagram illustrating an overall configuration of an optical recording device according to a second embodiment (claim 3) of the present invention.

FIG. 3 is a block diagram illustrating an overall configuration of an optical recording device according to a third embodiment (claim 4) of the present invention.

FIG. 4 is a block diagram illustrating an overall configuration of an optical reproducing device according to a fourth embodiment (claim 7) of the present invention.

FIG. 5 is a block diagram illustrating an overall configuration of an optical reproducing device according to a fifth embodiment (claim 8) of the present invention.

FIG. 6 is an explanatory diagram showing the principle of interleaving.

FIG. 7 is an explanatory diagram showing a data structure based on redundancy when recording code information.

FIG. 8 is an explanatory diagram showing a data configuration based on redundancy when recording continuity information such as voice and images.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk 2 ... Motor 3 ... Laser beam light source and irradiation optical system unit 4 ... Modulation means 5 ... Error detection / correction processing circuit 6 ... Input section 7 ... Redundancy setting means 8 ... Information type determination means 9 ... Second input section 10 ... Third input section 13 ... Laser beam light source and irradiation / reproduction optical system 14 ... Demodulation means 15 ... -Error detection / correction processing circuit 16 ... Output unit 17 ... Type information reading means 18 ... Redundancy setting means 19 ... Redundancy reading means

Claims (8)

[Claims] 1. A code string representing information to be recorded is a "code string having a predetermined redundancy" by "error detection / correction processing".
In the optical recording method of recording information by irradiating an optical recording medium that is moving relative to the beam while modulating the laser beam in accordance with this “code string”. A recording method, wherein the redundancy is set and recorded according to the type. 2. An input unit of a code string representing information to be recorded, and "error detection / correction processing" for converting the code string into a "code string having a predetermined redundancy".
A correction processing circuit ", a laser beam light source, a modulation means for modulating the intensity of the laser beam according to the" code sequence ", an irradiation optical system for guiding the beam from the light source to an optical recording medium, and the medium with respect to the beam. In an optical recording device comprising moving means for relatively moving, an information type discriminating means for discriminating the type of the information and outputting the type information, and the redundancy corresponding to the type information from the discriminating means is "error". A recording device characterized in that a redundancy setting means for setting is added to the "detection / correction processing circuit". 3. An input unit for a code string representing information to be recorded, and "error detection / correction processing" for converting the code string into a "code string having a predetermined redundancy".
A correction processing circuit ", a laser beam light source, a modulation means for modulating the intensity of the laser beam according to the" code sequence ", an irradiation optical system for guiding the beam from the light source to an optical recording medium, and the medium with respect to the beam. An optical recording device comprising moving means for relatively moving, a second input section for inputting type information indicating the type of information,
And a redundancy setting means for setting the redundancy corresponding to the type information input from the second input unit to the "error detection / correction processing circuit". 4. An input unit for a code string representing information to be recorded, and "error detection / correction process" for converting the code string into a "code string having a predetermined redundancy".
A correction processing circuit ", a laser beam light source, a modulation means for modulating the intensity of the laser beam according to the" code sequence ", an irradiation optical system for guiding the beam from the light source to an optical recording medium, and the medium with respect to the beam. An optical recording device comprising moving means for relatively moving the recording device, wherein a third input section for inputting the redundancy is added. 5. An optical recording medium characterized in that, in addition to the information to be recorded, type information indicating the type of information or redundancy is recorded. 6. A code string representing information to be recorded is a "code string having a predetermined redundancy" by "error detection / correction processing".
The information is reproduced by irradiating a laser beam on the optical recording medium converted and recorded into a “code string” to read the “code string”, and then returning to the original code string by the “error detection / correction process”. In the optical recording reproducing method, the type information indicating the type of information or the redundancy is recorded on the medium, and the "error detection / correction process" is performed according to the redundancy corresponding to the read type information. A reproducing method characterized by performing. 7. A moving means for moving the optical recording medium relative to the laser beam, a laser beam light source, an irradiation optical system for guiding the laser beam to the medium, a beam transmitted through the medium or reflected by the medium. Demodulation means for receiving the received beam and demodulating into a "code string having a predetermined redundancy", a reproduction optical system for guiding the beam transmitted through the medium or the beam reflected by the medium to the demodulation means, An "error detection / correction processing circuit" for converting the "code string having a predetermined redundancy" reproduced by the demodulating means into a code string representing the recorded information itself based on the predetermined redundancy, and A type information reading unit for reading "type information indicating the type of information" recorded on the medium in an optical recording reproducing device including an output unit of a code string representing the information itself to be recorded,
And a redundancy setting means for setting the redundancy corresponding to the type information from the reading means to the "error detection / correction processing circuit". 8. A moving means for moving an optical recording medium relative to a laser beam, a laser beam light source, an irradiation optical system for guiding the laser beam to the medium, a beam transmitted through the medium or reflected by the medium. Demodulation means for receiving the received beam and demodulating into a "code string having a predetermined redundancy", a reproduction optical system for guiding the beam transmitted through the medium or the beam reflected by the medium to the demodulation means, An "error detection / correction processing circuit" for converting the "code string having a predetermined redundancy" reproduced by the demodulating means into a code string representing the recorded information itself based on the predetermined redundancy, and , A predetermined redundancy recorded on the medium is read in an optical recording reproducing apparatus including an output unit of a code string representing information to be recorded, and the information is set to an "error detection / correction processing circuit". Reproducing apparatus characterized by the addition of redundancy reading means.