JP3058467B2 - Information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording / reproducing information on a recordable recording medium such as various rewritable optical disks using a so-called incomplete interleave.

[0002]

2. Description of the Related Art Conventionally, a so-called compact disk (hereinafter referred to as a CD) in which continuous information such as music information is recorded as digital signals by optically detectable minute pits has been widely used. The CD is reproduced by a reproduction-only optical disk reproducing device.

FIGS. 9 and 10 are schematic diagrams for explaining a signal format used in a CD. As shown in FIG. 9, one frame 31a of the recording signal includes a frame synchronization signal 31b indicating the beginning of the frame, a subcode 31c (details will be described later) indicating additional information of data, and an error in the 24-byte data as main information. It is composed of a data field 31d to which a parity code for detection and correction is added.

[0004] The data in the data field 31d is stored in a CIRC (Cross Interleaved Reed So
Error detection and correction are performed by an error detection and correction method with incomplete interleaving called lomon code).

As shown in FIG. 10, a subcode 31c for 98 frames (constituting one sector 32a (one subcoding frame)) forms one subcoding block 32c.
2c indicates a track number (called a song number when the main information is music information), absolute address information on the disc, and the like.

The frame synchronization signal 32b and the data field 32d show a state where the frame synchronization signal 31b and the data field 31d of FIG. 9 are collected for 98 frames, respectively.

If the length of one sector 32a, that is, the sector length is, for example, 13.3 [ms], one sector is 75 seconds and the sector number on the disk is "minute" based on time. ":" Second ": can be represented by a combination of" sector number within one second (that is, any value from 0 to 74) ", and this sector number is continuous time information sequentially increasing from the innermost circumference of the disk. And location information.

FIG. 8 is a schematic diagram showing an area arrangement on a disk in a CD. The disk 33 includes a main information recording area 33a including main information such as music information and a sector number according to the subcode, and additional information regarding each piece of main information recorded in the main information recording area 33a, for example, a track number and TOC (Table Of Contents) area 33 in which the recording start sector number of the track is indicated by a subcode
b.

According to the above-mentioned format, the CD player loads the TOC area 3 when the disc 33 is loaded.
By reading the subcode information of 3b, the number of each piece of main information (corresponding to the number of music pieces in the case of music information) and the sector number of the recording start position are recognized, and a desired track is sent to a subsequent reproduction instruction. Is quickly executed by checking the subcode information of the TOC area 33b with the sector number by the subcode of the main information recording area 33a.

In the above-mentioned CD, recording is performed at a constant linear velocity (CLV).
(Constant Linear Velocity)) method,
The recording density is constant at any radial position on the disk 33, whereby the recording capacity can be improved.
In an actual CD player, at the time of reproduction, the rotation of the disc 33 is controlled so that, for example, the interval of the frame synchronization signal in the reproduction signal from the CD recorded in the above signal format becomes the reference length. CLV control is realized.

On the other hand, when recording and using various information such as music information or computer information on a rewritable optical disc such as a magneto-optical disc which has been developed in recent years, a conventional CD or CD-ROM (Compact Disk-Read Only M
It is desirable to provide a compatible information recording / reproducing apparatus by sharing a reproducing method with the emory).

In this case, especially in an initial disk on which no information is recorded, since there is no absolute address using a subcode according to the signal format of the CD or a frame synchronization signal which can be used for CLV control, the recording is not performed. Access to an arbitrary sector position prior to the
V control becomes impossible.

Therefore, as a recording method of an absolute address which replaces the recording by the sub-code, the absolute address is, for example, bi-phase mark modulated, and then the guide groove of the optical disk is set according to whether each bit is "0" or "1". (See Japanese Unexamined Patent Publication (Kokai) No. 1-39632), in which the disk is biased inward or outward in the radial direction of the disk, or the width of the guide groove is changed.

In this case, the frequency band of the absolute address by the biphase mark modulation and the EFM (Eight to Fourt) are used.
If the frequency band of the modulated recording information is made different, it is possible to separate them from each other and reproduce them. An access operation can be performed using the absolute address.

Also, in the CLV control, accurate speed control is possible by using the reproduced carrier component of the absolute address, and the CLV control can be performed even during recording.

When information is rewritten on a rewritable disk using the CD signal format, the data to be rewritten and the data to be rewritten on an actual disk are obtained by the incomplete interleaving by the CIRC. Since the data before and after are mixed in the same sector, and an error correction link is given between them, it is difficult to rewrite only the desired data in order to maintain this link. (For details, refer to JP-A-1-55787 and the like).

In other words, if only certain data is rewritten, near the recording start point and end point of the rewritten data, the association of error correction between the preceding and succeeding data is lost. Is more likely to occur.

To prevent this reproduction error, for example,
Additional data (dummy data) including a parity code for correcting a reproduction error that may occur near the recording start point or end point of the data before and after the data to be actually recorded and reproduced.
It is conceivable to provide an additional sector in order to record.

For example, in the case of the CD format, the CIR
In order to achieve the original correction capability of C, a code propagation length of 105 frames is required due to the non-completed interleaving, so (105/98) ≒ 1.07 sectors before and after a sector composed of 98 frames. In other words, it is desirable to provide additional sectors substantially every two sectors. The additional sector at the front is a PLL from the re-recording start point.
(Phase Locked Loop).

In order to facilitate address management and the like when rewriting information, a block is formed for each of a predetermined number of sectors, and two blocks are provided at the beginning and end of each block, for example, as described above. By setting an additional sector of, information can be rewritten in block units.

[0021]

However, when an additional sector is set for each block, and when a large amount of data is recorded over a large number of sectors, the additional data is stored in the additional sectors provided for each block. Since it is necessary to record, there is a problem that the use efficiency of the disc is lowered and the data transfer speed is lowered.

[0022]

In order to solve the above-mentioned problems, an information recording / reproducing apparatus according to the present invention provides a recordable recording medium in which a physical sector number of a recording area is given by a pre-recorded address. In an information recording / reproducing apparatus for recording / reproducing information using an incomplete interleave, an n1 front additional sector is set at the front and n2 rear additional sectors are set at the rear for every predetermined number n of effective sectors. (N +
Information to be recorded is one block or a small number in units of a block composed of (n1 + n2) sectors.
Then, for the information of the effective sector of each block, a front additional data to be recorded in the front additional sector of the block and a rear additional data to be recorded in the rear additional sector of the block are generated and added, and the information is recorded. 1 mode and (n +
Many blocks composed of (n1 + n2) sectors
Continuously record the information to be recorded over a number , and
A second mode in which the front additional data is added only to the front n1 sectors in the first block of the information to be recorded and the rear additional data is added only to the rear n2 sectors in the last block. a recording means for recording information by either mode, information to be recorded
The mode is selected according to the volume of the information .

[0023]

According to the above arrangement, if the data to be recorded has a relatively small capacity such as character information, the information is recorded in one or a relatively small number of blocks by performing recording in the first mode. It can be recorded, and the recorded information can be easily rewritten in block units.

In this case, by adding the front additional data and the rear additional data to each block, detection and correction of a reproduction error can be performed, and the data volume is relatively small. The addition of the rear additional data causes a slight decrease in the use efficiency of the recordable recording medium.

On the other hand, if the data to be recorded has a large capacity that covers a large number of blocks, by performing recording in the second mode, a predetermined number of front additional data and Since only predetermined information is continuously recorded in other blocks only by adding the rear additional data, the use efficiency of the recordable recording medium when recording large-capacity data can be improved. .

In this case, no additional data is recorded in blocks other than the first and last blocks. However, since error correction associativity is continuously provided between adjacent blocks by incomplete interleaving, reproduction errors are not caused. Is reliably detected and corrected.

The second mode is particularly suitable for data having a relatively large capacity such as still image data and a fixed data length. In other words, when large-capacity data having a fixed data length is recorded in the second mode, when rewriting is performed, the data is written in a recording block group of conventional still image data or the like in a replacement format. Address management accompanying rewriting can be easily performed.

Even if the data has a relatively large capacity and the data length is not constant, the data may be recorded in the first mode.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to FIGS.

As shown in FIG. 6, a magneto-optical disk 1 as a rewritable recording medium has a TOC on its inner peripheral end.
The area 1a is provided, and most of the area closer to the outer periphery than the TOC area 1a is an information recording area 1b.

In the information recording area 1b, music information,
Various information such as characters, images, and code data are recorded. On the other hand, in the TOC area 1a, additional information relating to each information recorded in the information recording area 1b, for example, a start block position and an end block position for each information Etc. are recorded.

As shown in FIG. 7, spiral guide grooves 2.2 (shown by hatching for convenience) are provided in the TOC area 1a and the information recording area 1b of the magneto-optical disk 1 at predetermined intervals in the disk radial direction. It is formed apart. After the bi-phase mark modulation, the absolute address (address) on the disk corresponds to whether each bit is "1" or "0", and guide grooves 2.2 are formed on the magneto-optical disk 1. It is recorded by offsetting radially outward or inward.

The above absolute address indicates a position on the disk and is also used as rotation control information when performing CLV control or the like. Since the absolute address in this embodiment corresponds to each sector in the CD format, the absolute address is hereinafter referred to as a physical sector number.

In the block diagram of FIG. 5, the information recording / reproducing apparatus according to the present embodiment irradiates the spindle motor 3 for supporting and rotating the magneto-optical disk 1 and irradiating the magneto-optical disk 1 with laser light during recording and reproduction. An optical head 4 and a coil 5 for applying a magnetic field to the magneto-optical disk 1 during recording are provided.

The optical head 4 and the coil 5 constitute recording means, and record information in the first or second mode under the control of the controller 13 as described later.

The present information recording / reproducing apparatus is configured to perform recording by a so-called magnetic field modulation method, and is capable of performing overwriting for recording new information on recorded information.

The information recording / reproducing apparatus records / reproduces data from a host device (not shown) such as a so-called personal computer.
A terminal 6 is provided for receiving an instruction for reproduction or the like, and for inputting and outputting data such as character and image information with a higher-level device. The supplied information is supplied from the interface 18 to the switching circuit 19 as digital data f. The higher-level device issues commands such as recording and reproduction to the information recording / reproducing device.

The switching circuit 19 includes an interface 18
Digital data f from the sector data generation circuit 2
The additional data e from 0 has been input. When the controller 13 receives an instruction to record information or the like from the host device via the terminal 6 and the interface 18, the controller 1
3 sends a switching instruction to the switching circuit 19. The switching circuit 19
Based on this switching instruction, one of the data e and f is selected and output to the recording signal processing circuit 7 as digital data h.

The recording signal processing circuit 7 generates and adds parity for error detection and correction to the digital data h, adds the subcode information from the subcode generation circuit 17, and performs EFM modulation. A frame synchronization signal is added and supplied to the coil driver 8.

The coil driver 8 drives the coil 5 based on the supplied signal. At the same time, the optical head 4 irradiates the magneto-optical disk 1 with laser light.
The signal is recorded. The signal format here can be, for example, the same as that shown in FIGS. 9 and 10 as a conventional example.

On the other hand, at the time of reproduction, a signal reproduced by the optical head 4 is amplified by the reproduction amplifier 10 and sent to the prerecorded information detection circuit 11 and the reproduction signal processing circuit 15. The prerecorded information detection circuit 11 is configured by, for example, a bandpass filter and a PLL, and generates a clock synchronized with the prerecorded information in the reproduction signal extracted by the bandpass filter by the PLL. . Then, a clock synchronized with the prerecorded information, which is a biphase mark modulation signal of an absolute address, is supplied to the CLV control circuit 9.

The CLV control circuit 9 compares the synchronization clock from the prerecorded information detection circuit 11 with a reference frequency stored therein, and controls the rotation of the spindle motor 3 based on the difference signal. Has become. Thereby, accurate CLV control is realized. The prerecorded information in the reproduced signal extracted by the prerecorded information detection circuit 11 is supplied to the address detection circuit 12.

The address detection circuit 12 comprises, for example, a biphase mark demodulation circuit and an address decoder.
After the prerecorded information extracted by the prerecorded information detection circuit 11 is demodulated by a bi-phase mark, the address is decoded into an address on the disk, that is, a physical sector number by an address decoder, and the physical sector number is supplied to the controller 13. Is done.

In the reproduction signal processing circuit 15, the reproduction amplifier 10
EFM from the magneto-optical signal component in the reproduction signal supplied from
Demodulation is performed, and further, error detection and correction processing using parity for error detection and correction is performed. Then, the reproduced signal data is output from the terminal 6 to the host device via the interface 18.

The subcode information EFM-demodulated by the reproduction signal processing circuit 15 is supplied to a subcode detection circuit 16,
The subcode information recognized by the subcode detection circuit 16 is supplied to the controller 13. The controller 13
A recording / reproducing instruction is received from the host device via the terminal 6 and the interface 18.

The controller 13 receives the physical sector number from the address detection circuit 12 and recognizes the position of the optical head 4 on the magneto-optical disk 1, and the optical head 4 and the coil 5
Optical head 4 and coil 5 by a moving mechanism (not shown)
Has an access function to move the to a predetermined position.

Further, the controller 13 selects the subcode information supplied from the subcode detection circuit 16 and
The information related to the TOC content from the host device, which is stored in the OC memory 14 or provided via the interface 18, is stored in the TOC memory 14, and the content of the TOC memory 14 can be read. .

The sub-code information in the TOC memory 14 is supplied to a sub-code generation circuit 17 as needed, where a sub-code is generated.
It is FM-modulated and supplied to the coil driver 8. As a result, the subcode information in the TOC memory 14 is recorded in the TOC area 1a of the magneto-optical disk 1.

FIG. 1 shows a first mode of the present invention in which small-capacity information da suitable for recording / reproduction in units of blocks, such as relatively small-capacity information such as character information or management information such as a directory, is magneto-optical. FIG. 3 is a schematic diagram showing an information arrangement when recording information on a disk 1, in which I is a block configuration, II
Indicates the sector configuration of each block.

As shown at I in FIG. 1, each block has B0,
Block numbers such as B1, B2,.
As shown in II in the figure, individual sectors in each block include:
"Minute": "second": "sector number within one second based on time (in this embodiment, 75 sectors are included in one second,
A physical sector number consisting of a combination of any of 0 to 74) "is assigned. The data dg of each block is 8
For example, a physical sector number (01:00:00) is assigned to the first sector of the block having the block number B0.
Is given.

When recording information, the controller 13
In response to a recording instruction of a predetermined block number range given from the host device via the interface 18, the arithmetic unit determines which value of the actual physical sector number the predetermined block number range corresponds to. This will be described specifically with reference to the example of FIG.

For example, block numbers B1 to B1
When there is a recording instruction for the block B3, the number of sectors per block is "8", and the physical sector number at the head of the block with the block number B0 is (01:00:00) as described above. Is predetermined, the physical sector number at the head of the block with the block number B1 at which recording is started is (01: 00: 0)
0) + block number (1) × sector number (8) = (01:
00:08), and the head physical sector number of the block with the block number B1 can be easily obtained.

When the physical sector number of the block with the block number B1 is obtained in this way, an access operation to the block is executed. Then, with respect to the block of the block number B1 (see FIG. 3 (a)), the sector n ₁ piece provided by the data generating circuit 20, wherein the two front additional data d1 (same to be recorded on the front additional sectors FIG. (D)), additional data e (FIG. (B)) composed of n ₂ , in this case, two rear additional data d2 to be recorded in the rear additional sector, and an upper level given via the interface 18. Digital data f composed of divided data D1 (FIG. 10C) obtained by dividing small-capacity information da such as character information from the apparatus into four sectors corresponding to the effective sector dd is sequentially switched by the switching circuit 19. Desired information recording is performed.

The recording procedure of the block with the block number B1 will be described once. First, the physical sector number (0
1:00:08), the front additional data d1 to be recorded in two sectors from the sector is supplied from the sector data generation circuit 20, supplied to the recording signal processing circuit 7 via the switching circuit 19, and supplied to the magneto-optical disk 1. Is recorded in the information recording area 1b (period t1 in FIG. 3).

Subsequently, in the small-capacity information da such as character information from the higher-level device provided through the interface 18, the divided data D 1 corresponding to the size of the effective sector dd is set as the sector (01:00:10). The data is supplied to the recording signal processing circuit 7 via the switching circuit 19 and is recorded (period t2).

Thereafter, the rear additional data d2 corresponding to two sectors from the sector of (01:00:14) is given by the sector data generation circuit 20, supplied to the recording signal processing circuit 7 via the switching circuit 19, and recorded. (Period t
3).

With the above operation, recording for one block is completed, and thereafter, blocks of block numbers B2 and B3 are successively recorded through the operations shown at t4 to t9.

In this way, if only the block number is specified from the host device such as a personal computer,
The information recording / reproducing apparatus can record the small-capacity information da by adding the additional data e, and the recorded blocks can be independently rewritten in block units.

As for the area management of the recorded small capacity information da, the higher-level device allocates a predetermined block using the area management information itself as the small capacity information da, and records it through the same operation as described above, or , Controller 1
3 and the subcode generation circuit 17 via the TOC memory 14
After converting the data into a predetermined format, the data may be supplied to the recording signal processing circuit 7 for recording. In the latter case, usually
The TOC area 1a is used as a recording area for area management information.

Next, a recording operation when recording large-capacity information db having a relatively large capacity such as still image information in the second mode of the present invention will be described with reference to the example of FIG. In FIG. 2, I indicates a block configuration, and II indicates a sector configuration. As described above, one block of data dg is composed of eight sectors. III indicates large-capacity information db to be recorded.

First, interface 1
In response to a recording command from the block of the designated block number given via the controller 8, the controller 13 performs an operation of converting the block into an actual physical sector number. This will be specifically described with reference to the example of FIG.

For example, the host device sends the physical sector number B5
When there is a recording instruction from the block 625, the number of sectors per block is "8", and the physical sector number of the first sector of the block of the block number B0 is (0).
1:00:00), the physical sector number of the first sector of the block with the block number B5625 at which recording is started is (01:00:
00) + block number (5625) × number of sectors (8) =
(01:00:00) + 45000 = (11: 00: 0)
0), and the physical sector number of the leading sector of the block with the block number B5625 can be easily obtained.

The physical sector number (1
After performing necessary access operations on the sector (FIG. 4 (a)) at 1:00:00), first, the switching circuit 19 is switched to the sector data generation circuit 20 side (FIG. 4 (b)).
Additional data e supplied from the sector data generation circuit 20
Is supplied to the recording signal processing circuit 7 as digital data h, so that the front additional data d is added to the first two sectors in the first block having the block number B5625.
1 (FIG. 4D) is recorded (period t1).

Next, the switching circuit 19 is switched to the interface 18 side, and large-capacity information db supplied as digital data f from the host device via the terminal 6 and the interface 18 is supplied to the recording signal processing circuit 7 as digital data h. As a result, the block number B56
Large-capacity information db such as still image information is stored in the remaining 25 sectors.
(FIG. 4C) is recorded (period t2).

Subsequently, the large-capacity information db is continuously recorded after the subsequent block number B5626 (period t).
3) According to the data length, for example, the block number B68
Recording is continued up to 95 blocks (period t3).

When the recording of the large-capacity information db is completed, the switching circuit 19 is switched to the sector data generation circuit 20 side, and the rear additional data d2 is recorded in, for example, the last two sectors of the block with the block number B6895 ( Period t5).

In this case, since the large capacity information db ends at the sixth sector of the last block, the rear additional data d
2 but is recorded in the last two sectors of the end of the block, even when a large-capacity information d b has been completed in five sectors th previous last block, the rear additional data d followed by
2 just needs to be recorded.

The large-capacity information d recorded as described above
Regarding the area management of b, according to an instruction from a higher-level device,
After being converted into a predetermined format by the subcode generation circuit 17 via the controller 13 and the TOC memory 14 as area management information, the converted data is supplied to the recording signal processing circuit 7 and recorded. In this case, as the recording area of the area management information,
The TOC area 1a is used.

The small capacity information d recorded as described above
a or the large-capacity information db is reproduced by transmitting a reproduction command from a higher-level device and a block number of an area to be reproduced to the controller 13 via the interface 18 to the physical sector number in the same manner as in the above-described recording. After performing the conversion, the necessary access operation is performed.

When the reproduction information is the small capacity information da,
1, the reproduction signal from the optical head 4 is amplified by the reproduction amplifier 10, and the reproduction signal processing circuit 15 performs EFM demodulation on the magneto-optical signal component in the reproduction signal. Error detection and correction processing using the parity for correction is performed.

In the error detection and correction operation, the front additional data d1 recorded in the front additional sector in FIG.
The reproduction process of the valid sector dd is also performed using the additional data e of the rear additional data d2 recorded in the rear additional sector. Then, among the reproduced signal data, four sector division data D1 and D2 corresponding to the effective sector dd.
.. Are output to the higher-level device via the interface 18 for each block.

When the reproduction information is the large-capacity information db, the reproduction signal from the optical head 4 is reproduced by the reproduction amplifier 10 and the reproduction signal After the EFM demodulation is performed on the magneto-optical signal component and the error detection and correction processing using the parity for error detection and correction is performed, the signal is output to the host device via the interface 18 and the terminal 6.

In this case, since the front additional data d1 and the rear additional data d2 are added to the front and rear of the large capacity information db, when an error occurs at the beginning and end of the large capacity information db. Detection and correction are performed reliably.

As described above, when recording the small capacity information da having a relatively small capacity, the first mode is selected and the front additional data d1 and the rear additional data d2 are added for each block. By performing recording, information can be rewritten in block units at the time of rewriting, so that information management becomes easy.

In this case, since the small-capacity information db ends recording in one or a small number of blocks, even if the front additional data d1 and the rear additional data d2 are added to each block, magneto-optical The use efficiency of the recording area of the disk 1 does not decrease so much, and the data transfer efficiency also becomes good.

On the other hand, large capacity information db having a relatively large capacity
Is recorded, the second mode is selected and the front additional data d1 and the rear additional data d2 are added only to the first and last blocks, so that the utilization efficiency and the transfer efficiency of the magneto-optical disk 1 are reduced. Can be secured.

In this case, if the data length of the large-capacity information db is constant, it is possible to rewrite the large-capacity information db by rewriting the block position where the large-capacity information db was recorded before rewriting. The second mode is particularly suitable for large-capacity information db having a fixed data length because address management at the time is prepared. Even if the information has a relatively large capacity, the information whose data length is not constant may be recorded in the first mode.

When recording on the magneto-optical disk 1 by the present information recording / reproducing apparatus for backup of information to be recorded on another recording medium,
Since the rewriting frequency is low, it is preferable to perform recording in the second mode in which the use efficiency of the recording area is high.

Prior to the start of recording on the magneto-optical disk 1, the upper-level device gives the area where data is to be recorded in each of the first and second modes, the number of sectors per block, and the like. One predetermined area can be registered.

As described above, instead of separately setting each mode area on the magneto-optical disk 1 in advance, an identification code indicating which mode each information is recorded in is attached. Then, the recording information in the first and second modes may be mixed on the magneto-optical disk 1.

In the above embodiment, one block is composed of eight sectors. However, this is a numerical value used for convenience of explanation, and the block size can be variously changed as necessary.

The absolute address may be in any form such as a pit form as long as it is prerecorded and recognizable information.

Further, in the above-described embodiment, the disk-shaped recording medium of the magneto-optical system has been described. However, not only other rewritable recording media but also write-once recording media which can be recorded only once can be used. Applicable. As a write-once recording medium,
For example TeO _X, it includes TeC and organic dye film and the like.
Further, the shape of the recording medium is not limited to the disk form described in the above embodiment, and a tape-shaped or card-shaped recording medium can be implemented without departing from the spirit of the present invention.

[0084]

As described above, the information recording / reproducing apparatus of the present invention uses an incomplete interleave on a recordable recording medium to which a physical sector number of a recording area is given by an address recorded in advance. In an information recording / reproducing apparatus for performing recording / reproducing of (i), (n + n1 + n2) sectors in which n1 front additional sectors are set at the front and n2 rear additional sectors are set at the rear for every predetermined number n of effective sectors. as a unit composed of blocks, blanking information to be recorded
Locks are divided into one or a small number, and for the information of the effective sector of each block, front additional data to be recorded in the front additional sector of the block and rear additional data to be recorded in the rear additional sector are generated and added. In the first mode for recording the information, the information to be recorded is continuously recorded over a large number of blocks each composed of (n + n1 + n2) sectors, and the front of the first block of the recorded information is recorded. The front additional data is added to only n1 sectors, and the rear n data in the last block is added.
There is provided recording means for recording information in one of a second mode in which the rear additional data is added to only two sectors, and a mode is selected according to the capacity of the information to be recorded.
It is a configuration that.

Thus, if the data to be recorded has a relatively small capacity such as character information, the information is recorded in one or a relatively small number of blocks by performing recording in the first mode. In particular, when the present invention is applied to a rewritable recording medium, recorded information can be easily rewritten in block units. In this case, by adding the front additional data and the rear additional data to each block, it is possible to detect and correct a reproduction error, and since the data volume is relatively small, the front additional data and the rear additional data are added to each block. , The use efficiency of the rewritable recording medium is slightly reduced.

On the other hand, if the data to be recorded has a large capacity that covers a large number of blocks, by performing recording in the second mode, a predetermined number of front additional data and Since only predetermined information is continuously recorded in other blocks only by adding the rear additional data, the use efficiency of the recordable recording medium when recording large-capacity data can be improved. .

In this case, no additional data is recorded in blocks other than the first and last blocks. However, since error correction associativity is continuously provided between adjacent blocks by non-complete interleaving, reproduction errors are not caused. Is reliably detected and corrected.

The second mode is particularly suitable for data having a relatively large capacity such as still image data and a fixed data length. In particular, when a rewritable recording medium is used, large-capacity data having a fixed data length is recorded in the second mode. If the group is written in the replacement format, address management at the time of rewriting large-capacity information becomes easy.

It should be noted that even if the data has a relatively large capacity and the data length is not constant, the data may be recorded in the first mode.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a relationship between a block number, a physical sector number, and recording information according to the present invention when recording small-capacity information.

FIG. 2 is an explanatory diagram showing a relationship between a block number, a physical sector number, and recording information according to the present invention when large-capacity information is recorded.

FIG. 3 is a time chart showing a flow of information according to the present invention when recording small-capacity information.

FIG. 4 is a time chart showing a flow of information according to the present invention when large-capacity information is recorded.

FIG. 5 is a block diagram of the information recording / reproducing apparatus of the present invention.

FIG. 6 is a schematic plan view of the magneto-optical disk of the present invention.

7 is an enlarged plan view of the magneto-optical disk shown in FIG.

FIG. 8 is a schematic plan view of a conventional compact disc.

FIG. 9 is a schematic diagram showing a frame signal format of a conventional compact disc.

FIG. 10 is a schematic diagram showing a sector format of a conventional compact disk.

[Explanation of symbols]

 Reference Signs List 1 magneto-optical disk (recordable recording medium) 4 optical head (recording means) 5 coil (recording means) d1 front additional data d2 rear additional data

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuaki Okumura 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Shigeo Terashima 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp shares In-company (56) References JP-A-63-285778 (JP, A) JP-A-1-86371 (JP, A)

Claims (1)

(57) [Claims] An information recording / reproducing apparatus for recording / reproducing information on a recordable recording medium to which a physical sector number of a recording area is given by an address recorded in advance by using an incomplete interleave. number of valid sectors n1 pieces of the front additional sector in its front part each block as a unit composed of setting the n2 or rear additional sector in the rear (n + n1 + n2) number of sectors, the block information to be recorded One or
Divide the data into a small number and generate / add the front additional data to be recorded in the front additional sector and the rear additional data to be recorded in the rear additional sector of the effective sector information of each block, and record the information. And a block composed of (n + n1 + n2) sectors.
Continuously record the information to be recorded over many of the
A second mode in which front additional data is added only to the front n1 sectors in the first block of information to be recorded, and rear additional data is added only to the rear n2 sectors in the last block. a recording means for performing any of the modes by the recording of information with the recording of
An information recording / reproducing apparatus, wherein a mode is selected according to the capacity of information to be read.