JP2532906B2 - Information recording medium Disk recording / reproducing method - Google Patents

Description

The present invention relates to a recording / reproducing method for an information recording medium disk.

(Prior Art) With the increasing demand for recording various information signals with high recording density, information signals have been recently used by using information recording media made on the basis of various constitutional principles and operation principles. It is well known that high density recording / reproducing has been performed, for example, a recording / reproducing apparatus using a magnetic recording medium disk, or for example, forming irregularities according to an information signal on the signal surface of the information recording medium. A recording / reproducing apparatus, which records an information signal and reproduces the recorded information signal by optical means, or reproduces it by detecting a change in electrostatic capacitance value. It has already been put to practical use for recording / reproducing audio signals, and in order to meet the demand for high-density recording / reproducing in various technical fields, an information signal is recorded on the recording layer of an information recording medium. By irradiating a beam whose intensity has been modulated by a laser beam, a physical change or a chemical change according to the information signal is caused in the recording layer of the information recording medium, and the information signal recording medium is also studied. However, in recent years, as semiconductor lasers that operate stably have been easily obtained, various optical discs that use laser light for high-density recording and reproduction have already been put into practical use. As is well known, it is in the present state of being commercialized or being researched and developed for practical use.

That is, a recorded optical disc (playback-only optical disc) that is copied in large quantities from an original disc on which an information signal is recorded by pits formed as somewhat difficult concaves or convexes is, for example, a video disc or a compact disc. In addition to becoming popular as ordinary discs in homes,
Optical discs that can be additionally recorded by the user only once (write-once optical discs) and erasable optical discs are being actively researched and developed for practical use in, for example, office file memories and other applications. Even in the case of a write-once type optical disc or an erasable type optical disc, what kind of physical change the information layer is recorded by the heating action of the spot of the laser light beam in the recording layer in those types? When categorizing with attention, pit formation type, bubble or unevenness formation type, magneto-optical type,
In addition to various types such as phase change type (thermal transformation type in which light transmittance, reflectance, absorptance changes due to heat energy), recording and reproducing operations are also performed. Many proposals have been made for information recording media that can be performed using energy other than the above.

(Problems to be Solved by the Invention) By the way, in many recording / reproducing apparatuses in the related art, a desired information signal among information signals recorded in an information recording medium disk (hereinafter, also referred to as a disk) is desired. In order to make it possible to read quickly, the address information is previously recorded in the recording trace on the disc, or the information signal for specifying the recording trace is recorded when the information signal is recorded. There is.

For example, in a hard disk used for magnetic recording and reproduction, information for enabling high-speed access to each of a plurality of sectors provided so as to divide the recording area of the disk into a plurality of blocks in the circumferential direction. Is recorded in each sector. Further, for example, in a compact disc, a 1-bit subcode is recorded for each signal of one block so that it can be used for searching for a recording trace.

FIG. 7 is a diagram showing an example of a recording signal format on a hard disk, and FIGS. 8 and 9 are diagrams showing an example of a recording signal format on a compact disk. In FIG. 9 and FIG. 9, S and Sync are block synchronization signals, and SC is a subcode (auxiliary code signal).

In the above-mentioned hard disk, since information capable of specifying the recording trace is recorded for each sector, when the magnetic head is moved at high speed in the radial direction of the disc to search for the recording trace, it is recorded in each sector. There is a problem that the storage capacity of the data that can be stored in the hard disk becomes small because the information specifying the recording trace is recorded for each sector instead of reliably reading the recorded information. Further, in the above-mentioned compact disc, since only one bit subcode is attached to one block signal, the storage capacity for data can be sufficiently increased, while the subcodes in a plurality of blocks are consecutive. If it is not read, access information cannot be obtained.

Now, when searching for a predetermined recording mark on a disc at high speed, generally, when the distance between the target recording mark position and the current reproducing element is large, the reproducing element in the radial direction of the disc is The transfer speed is increased, and when the distance between the target recording mark position and the current reproducing element is small, the transferring speed of the reproducing element in the radial direction of the disk is reduced,
In the search operation, the recording / reproducing element is designed to quickly reach the targeted recording trace without the recording / reproducing element overshooting the targeted recording trace. When only one bit of subcode is attached to one block of signal, the recording / reproducing element is targeted so that the subcodes of a plurality of blocks of signals can be continuously read. A condition in which subcodes in signals of a plurality of blocks are continuously read unless the transfer speed of the reproducing element in the radial direction of the disc is set to be small from a position considerably distant from the recording trace. However, the problem is that the time required to search the target recording trace becomes long.

The above points will be described below with reference to FIGS. 10 to 12. FIG. 10 shows the recording trace Tr of the disc D.
And a transfer direction X of the recording / reproducing element. When the target recording trace is searched as described above, the recording / reproducing element is arranged in the radial direction of the disk D (arrow X). The recording / reproducing element is rapidly transferred in the radial direction of the disk D (the direction of arrow X) to cross the recording marks one after another as described above. When it crosses diagonally, the envelope of the reproduced signal reproduced by the recording / reproducing element becomes wavy.

FIG. 11D shows the envelope of the reproduction signal reproduced from the recording / reproducing element in the state where the recording / reproducing element is correctly following the recording trace of the disk D, and FIG. ) And (b) are envelopes of a reproduction signal reproduced from the recording / reproducing element when the recording / reproducing element diagonally traverses the recording marks of the disk D one after another, and are shown in FIG. 11 (a). The reproduction signal is higher than the transfer speed of the recording / reproducing element when the reproduction signal shown in FIG. 11 (b) is obtained.

As described above, when the reproduced signal from the recording / reproducing element is wavy on the time axis as shown in (a) and (b) of FIG. 11, in the portion where the amplitude of the reproduced signal is small. Since it is impossible to read data or the reading becomes bad, like the case of the compact disc mentioned above,
For a long period of time required for the subcodes in a plurality of blocks of signals to be read continuously, a state in which a small amplitude portion does not occur in the envelope of the reproduction signal, that is, the reproduction element has a low transfer speed. It must be made to traverse the trace at an angle, thus increasing the time required to search for the target trace.

(C) of FIG. 11 and (a) and (b) of FIG. 12 are reproduction signals reproduced from the recording / reproducing element when the recording / reproducing element is moved so as to cross the recording traces while tracking control is performed. When the recording / reproducing element is moved so as to cross the recording marks one after another while performing tracking control, a portion with a large amplitude becomes relatively long. Since the amplitude drop in the portion becomes large, the above-mentioned problem cannot be solved when the recording / reproducing element is moved so as to cross the recording marks one after another while performing tracking control. In addition, (a) of FIG.
(B) shows how the envelope of the reproduced signal from the recording / reproducing element changes in correspondence with the narrowing of the tracking range.

(Means for Solving Problems) The present invention divides data to be recorded / reproduced into blocks, provides a block synchronization signal at the beginning of each block, and also provides a code error detection signal, a correction parity, A signal in the form of a signal containing one or more of auxiliary code signals such as a signal indicating the integrated value of data transfer amount, a signal indicating a time length, and an identification signal of the attribute of the recorded content. In a recording / reproducing method of an information recording medium disk, which is configured to continuously record and reproduce the block signal configured as above, a block signal including only a block synchronization signal and data, and the block synchronization described above. A block sync signal having a signal form different from the signal form of the block sync signal in a block signal including only signals and data, an auxiliary code signal, and data. The present invention provides a recording / reproducing method for an information recording medium disk, in which recording / reproducing is performed in a state where the provided block signals are arranged on the time axis.

(Examples) Hereinafter, detailed contents of an information recording medium disk and a recording apparatus thereof according to the present invention will be specifically described with reference to the accompanying drawings. 1 to 4 are diagrams showing examples of signal structures of recording / reproducing signals in the recording / reproducing method of the information recording medium disc of the present invention, and FIG. 5 is a signal to which the recording / reproducing method of the information recording medium disc of the present invention is applied. FIG. 6 is a block diagram showing an example configuration of a part of the processing system, and FIG. 6 is a block diagram showing an example configuration of a recording / reproducing system.

1 and 2 are diagrams showing an example of the signal structure of a recording / reproducing signal in the recording / reproducing method for an information recording medium disk according to the present invention. In FIGS. 1 and 2, S, S1, S2, S3 are shown. Is a block synchronization signal to be arranged at the head position of each block signal, but each block synchronization signal S, S1, S2, S3 described above.
Is configured as having respective different signal forms, each of the block synchronization signals S, S1, S2, S3,
The block synchronization signal S is used when the block signal has a specific configuration, and the block synchronization signal S1 is used when the block signal has another specific configuration. Further, the block synchronization signal S2 is used in the case where the signal configuration of the block signal is another specific one, and further, the block synchronization signal S2 is used when the signal configuration of the block signal is another specific one. The block synchronization signal having a different signal form is used every time the configuration form of the signal of the block signal is different such that the synchronization signal S3 is used.

Therefore, when the block signals used in the implementation of the present invention are of N types having different signal configurations, N types of block synchronization signals having different signal configurations are used. Will be done.

(A), (b) and (c) of FIG. 4 exemplify block synchronization signals which are configured to have different signal forms, and (a) to (a) of FIG.
11T, 12T, 1T, 2T, etc. in (c) indicate the signal length when the period of the bit clock signal is represented by 1T.

In the recording / reproducing signal illustrated in FIG. 1 and FIG. 2, each block signal is a signal portion from the beginning portion of the block synchronization signal to the portion immediately before the next block synchronization signal. As for the recording / reproducing signal shown in FIG. 1, the recording / reproducing signal shown in FIG. 1 is the block synchronizing signal S1 and the auxiliary code signal SC1.
And a data, a block signal including a block synchronization signal S and data, a block signal including a block synchronization signal S and data, and a block including a block synchronization signal S1, an auxiliary code signal SC1 and data. Signals are arranged on the time axis. For example, regarding the recording / reproducing signal shown in FIG. 2, the recording / reproducing signal shown in FIG. 2 is the block synchronization signal S1. Block signal consisting of auxiliary code signal SC1 and data, block synchronization signal S2 and auxiliary code signal SC2
Block signal consisting of data and data, and block synchronization signal
A block signal composed of S3, an auxiliary code signal SC3 and data, and a block signal composed of a block synchronization signal S2, an auxiliary code signal SC2 and data are arranged on the time axis.

Auxiliary code signal SC shown in FIGS. 1 and 2
1, SC2, SC3 are one or more of various signals such as a code error detection signal, a correction parity, a signal indicating an integrated value of data transfer amount, a signal indicating a time length, and an identification signal of an attribute of recorded contents. Is configured by selecting
3 (a) and 3 (b) show an example of the structure of the above-mentioned auxiliary code signal.

The auxiliary code signal shown in FIG. 3 (a) is an example of an auxiliary code signal composed of a time code signal, a block number, a music number and an error detection signal (CRC). The auxiliary code signal shown in FIG. 3 (b) is an example of the auxiliary code signal composed of the time code signal and the error detection signal (CRC).

FIG. 5 shows a recording / reproducing signal composed of a block signal in which the block synchronization signal S is used and a block signal in which the block synchronization signal S1 is used.
FIG. 6 is a block diagram showing a configuration example of a circuit arrangement for reproducing the types of block synchronization signals S, S1. In FIG. 5, 1 is an input terminal of a signal obtained by detecting a recording / reproduction signal, and 2 is a clock signal. Input terminals, 3, 4 are D-type flip-flops, 5 is an exclusive OR circuit, 6 is a shift register, 7 is a decoder, and the decoder 7 outputs the detection signal DS of the block synchronization signal S to the output terminal 8. Output terminal 9
From the decoder 7 to the detection signal DS1 of the block synchronization signal S1
Is output.

FIG. 6 is a block diagram showing an example of the structure of a part of the recording / reproducing system, 10 is a drive motor for driving and rotating the disk 11 at a predetermined number of revolutions, and 12 is a recording / reproducing device having a recording / reproducing element. The recording / reproducing head 12 is an actuator 20 of a tracking control system (and a focus control system).
Is driven and displaced to a predetermined position with respect to the disk 11. The data is read from the disk 11 by the recording / reproducing head 12, the data is demodulated by the demodulation circuit 13, and the demodulated signal is decoded by the decoding circuit 14 and then the digital-analog converter.
It is digital-to-analog converted by 15 and output to the output terminal 16.

Further, the demodulated signal output from the demodulation circuit 13 is decoded by the auxiliary code signal decoding circuit 17 and the control circuit
Supplied to 19. In the control circuit 19, a control signal is generated by the information (operation mode information) supplied from the operation unit 18 and the auxiliary code signal supplied from the auxiliary code signal decoding circuit 18 and supplied to the actuator 20 for recording. By the recording / reproducing element in the reproducing head 12, the information signal is satisfactorily read from the target recording trace on the disk 11.

In the search mode, a control signal is sent from the control circuit 19 to a recording / reproducing head transfer mechanism (not shown),
The recording / reproducing head 12 is moved in the radial direction of the disk 11 at a predetermined transfer speed. The above-mentioned transfer speed is the position information (for example, block number) of the recording trace read from the recording / reproducing element.
And the position information of the recording trace input from the operation unit 18 (for example,
Block number) and.

As is clear from the above, in the recording / reproducing method of the information recording medium disk of the present invention, the data to be recorded / reproduced is divided into blocks, and a block synchronization signal is provided at the beginning of each block, and a code error occurs. Detection signal,
One or more of auxiliary code signals such as a correction parity, a signal indicating an integrated value of data transfer amount, a signal indicating a time length, and an identification signal of an attribute of the recorded content are included in the block as necessary. In a recording / reproducing method for an information recording medium disc, which is configured to continuously record and reproduce a block signal configured as a signal in a signal form on a time axis, a block signal including only a block synchronization signal and data, A block synchronization signal having a signal form different from the signal form of the block synchronization signal in the block signal including only the block synchronization signal and the data, and a block signal including the auxiliary code signal and data are arranged on the time axis. And a block in a signal form including a block synchronization signal, an auxiliary code signal, and data. As the signal, a plurality of types of block signals having different signal forms of the block synchronization signal are used for each of the different auxiliary code signals included therein, and the plurality of types of block signals described above are time-based. Recording and reproduction are performed in the state of being arranged above, and it is configured to include position information (for example, a block number) of a recording mark in successive block signals that constitute a recording and reproduction signal. Since the one having the auxiliary code signal is intermittently present, the recording / reproducing element is moved at a high speed in the radial direction of the disk so as to perform a high-speed search operation. Also, since the position information can be satisfactorily read from the recording trace, the recording / reproducing element can be quickly made to reach the target recording trace even in the high-density recorded disc. Door can be.

(Effects of the Invention) As is apparent from the details described above, in the recording / reproducing method of the information recording medium disc of the present invention, the data to be recorded / reproduced is divided into blocks, and the data is recorded at the beginning of each block. A type of auxiliary code signal such as a code error detection signal, a correction parity, a signal indicating an integrated value of data transfer amount, a signal indicating a time length, and an identification signal of an attribute of the recorded content while providing a block synchronization signal. In a recording / reproducing method for an information recording medium disk, which is configured to continuously record and reproduce a block signal configured as a signal having a signal form including the above in a block as necessary, on a time axis, A block signal including only a block synchronization signal and data, and a signal form of the block synchronization signal in the block signal including only the block synchronization signal and data described above. Recording / reproducing method for an information recording medium disc, wherein recording / reproducing is performed in a state in which a block synchronizing signal having a signal form different from that of the above, a block signal including an auxiliary code signal and data are arranged on a time axis. Among the successive block signals forming the recording / reproducing signal, there are intermittent ones having an auxiliary code signal including the position information (for example, block number) of the recording trace. According to the present invention, since various information signals can be recorded at a high recording density on a disc configured by using various recording media, a large recording capacity is required for recording. Can easily provide image data files, digital audio discs, digital video discs, etc., which are required for high-speed search operation. Even if the recording / reproducing element is moved at a high speed in the radial direction of the disc as described above, the position information can be satisfactorily read from the recording trace, so that even high-density recorded discs are recorded intermittently collectively. It is possible to read the position information of the existing recording trace and make the recording / reproducing element arrive at the target recording trace quickly, and the above-mentioned conventional problems are encountered in the recording / reproducing method of the information recording medium disk of the present invention. It is possible to satisfactorily solve this problem, and if recording / reproducing is performed so that the recording / reproducing is performed at a constant linear recording density, a higher density recording can be realized, and further, the auxiliary code signal can be encoded. If the error check parity is added, the data can be read out better.

[Brief description of drawings]

1 to 4 are diagrams showing examples of signal structures of recording / reproducing signals in the recording / reproducing method of the information recording medium disc of the present invention, and FIG. 5 is a signal to which the recording / reproducing method of the information recording medium disc of the present invention is applied. Block diagram showing an example of the configuration of part of the processing system, the sixth
FIG. 7 is a block diagram showing an example of a part of a recording / reproducing system, FIGS. 7 to 9 are views showing an example of a signal structure of a recording / reproducing signal in a conventional recording / reproducing method, and FIG. 11 and 12 are plan views for explanation, and FIGS. 11 and 12 are views showing envelopes of reproduced signals. S, Sync, S1 to S3 …… Block sync signal, SC, SC1 to SC3 ……
Auxiliary code signal, Tr …… recording trace of disk D, 1 …… input terminal of signal obtained by detecting read / write signal, 2 …… input terminal of clock signal, 3,4 …… D-type flip-flop,
5 ... Exclusive OR circuit, 6 ... Shift register, 7 ...
... Decoder, 8, 9, 16 ... Output terminal, 10 ... Drive motor for driving and rotating the disk 11 at a predetermined speed, 12 ...
A recording / reproducing head equipped with a recording / reproducing element, 20 ... an actuator of a tracking control system (and a focus control system), 13 ... a demodulation circuit, 14 ... a decoding circuit, 15 ... a digital / analog converter, 17 ... Auxiliary code signal decoding circuit,
18 …… Operating part, 19 …… Control circuit,

Claims (1)

(57) [Claims] 1. Data to be recorded / reproduced is divided into blocks, a block synchronization signal is provided at the beginning of each block, and a code error detection signal, a correction parity,
A signal indicating the integrated value of the data transfer amount, a signal indicating the time length,
A block signal configured as a signal in the form of a signal containing one or more types of auxiliary code signals such as identification signals of the attributes of the recorded contents as needed is continuously recorded and reproduced on the time axis. In the recording / reproducing method of the information recording medium disc, the block signal including only the block synchronizing signal and data, and the signal of the block synchronizing signal in the block signal including only the block synchronizing signal and data described above. Recording / reproduction of an information recording medium disk in which recording / reproduction is performed in a state in which a block synchronization signal having a signal form different from that of the form, a block signal including an auxiliary code signal, and data are arranged on a time axis. Method