JPS60114930A - Data recording and reproducing device - Google Patents

Abstract

PURPOSE:To ensure secrecy and to improve reliability by recording data while adding a secret code at data recording and discriminating whether the code is coincident with a secret code inputted at reproduction or not. CONSTITUTION:Retrieved data is formed as shown in the figure and consists of a retrieved code of 20 bytes divided into, e.g., a maximum of 6 items, address information cof 5 bytes and a secret code 16 bytes added as required. The said address information consists of a picture information length L of 1 byte and a picture information recording block number 2 bytes, and designation information X representing the presence of the secret code is recorded to the front 1 bit of the area of anoriginal size S. The secret code protects secrecy of the picture information corresponding to the retrieved data, consists of a secret code for generation and a secret code for retrieval and added at recording. Moreover, the coincidence with the secret code inputted at reproduction is discriminated and only when they are coincident, the reproduction is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data recording/reproducing device such as an optical disk device for recording or reproducing data on or from an original disk.

[Technical landscape of invention]

In recent years, image information such as documents that are generated in large quantities is photoelectrically converted by two-dimensional optical scanning, and this photoelectrically converted image information is recorded on an image recording device, or it can be used horizontally or laterally as necessary. Recently, an original disk device has been used as an image recording device in a first group information file device that can be reproduced and output as a hard copy or a soft copy.

Conventionally, such optical disk devices use an optical disk that records data in a spiral manner, and the data is recorded or reproduced by an optical head that moves linearly in the radial direction of the original disk using a linear motor. O In the above source disk, the spiral or concentric tracks are divided into blocks of fixed length data, and block address data is recorded in advance at the beginning of each block. It has become.

By the way, in order to protect the confidentiality of image information, a secret code is assigned to the search data corresponding to the image information, and only when this secret code matches the secret code input by the key during playback, the corresponding image information can be played back. It is about to be done.

[Problems with background technology]

However, in the above-mentioned apparatus, since the storage medium in which the search code is stored can be replaced, there is a need for a device that can more reliably protect the security of image information.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and its purpose is to provide a data recording and reproducing device that can securely protect the confidentiality of data and improve its reliability.

[Summary of the invention]

According to the present invention, when recording data, a secret code is added to a necessary block and recorded, and when playing back the data, it is determined whether or not the input secret code matches the secret code of the corresponding data. The data is played back only when they match.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an image information file device according to the present invention. That is, No. 5 is a main control device, a CPU 52 that performs each page allocation, a main memory 53, and a buffer memory, such as a page buffer, having a storage capacity corresponding to at least one unit of image information (original page). (Recording device) 54, a compression/expansion circuit 55 that compresses (reduces the redundant layer) and expands (returns the reduced redundancy) information on drawing method, and stores pattern information such as characters and symbols. It consists of a pattern information generator 56, a display interface 57, and a title memory 58 for storing all data successively output from a floppy disk 68 by a floppy disk device 67, which will be described later.

On the other hand, 6θ is a reading device, such as a two-dimensional scanning device, which obtains an electrical signal corresponding to the image information on the document 61 by passing a laser beam over the document 6. be.

Reference numeral 62 denotes a source disk device which sequentially distributes image information and the like read by the two-dimensional scanning device 60 and supplied via the main control device 51 onto the optical disk 1. On the other hand, the key 63 is a single key and is used to input instructions such as registration or search of a unique search code corresponding to image information, and each bridge operation command.

Reference numeral 64 denotes an output device, such as a display unit, such as a CRT display device (hereinafter referred to as a CRT display device), which displays images read by a two-dimensional scanning device 6o and supplied via the main controller si. Information or optical disk device 62
It displays image information read out from the main controller 5 and supplied via the main controller 5, and together with the display interface 57 in the main controller 5, it constitutes an image information display device in a large sense. . Reference numeral 65 denotes a recording device that stores image information read by the two-dimensional scanning device 6o and supplied via the main controller 5, or image information read from the optical disk device 62 and supplied via the main controller 51. etc., are issued as a hard copy 66.

Reference numeral 67 denotes a magnetic disk device which stores original image area information consisting of a search code entered by the keyboard 63 and a storage address on the original disk 1 where the image information corresponding to this search code is stored. Search data is stored on the magnetic disk 68 for each piece of image information.

FIG. 2 shows the structure of search data.

In other words, one search data consists of a 20-byte search code divided into a maximum of 6 items, 5-byte address information,
and a 16-byte secret code added as necessary. The above address information includes 1-byte intermittent information (length: protaf number) L, 2-byte image information recording block number (block number) T-ADR, 1-byte image information recording track address T-ADR, and 1
It consists of a byte original size S. However, original size S
In the area, the document size information is actually recorded in the rear 3 bits, and the remaining 1 bit on the front side records the secret code presence/absence 1 specification information X, which indicates the presence or absence of the secret code. . This confidential code presence/absence designation information X is 1
It is a code of "or 0", and l# indicates that a secret code exists after the address information, and O" indicates that a secret code does not exist. - 10,000, secret code is intended to protect the confidentiality of the image information corresponding to the search data, and includes a secret code for generation to ensure that only the file creator can change or delete the image information, and a password for authorized users. It consists of a secret code for searching to ensure that only the user or a related person can perform the inspection process on the image information.In other words, the secret code that was conventionally set in the management information can be used for various images. This is configured to be set in the search data corresponding to the information as necessary.Therefore, the secret code answer can also be changed for each troupe information.

FIG. 3 shows the configuration of the original disk device.

That is, the optical disc 1 is rotationally driven by the motor 2.

As shown in Fig. 4, the original disk has a donut-shaped metal coating layer such as tellurium or bismuth coated on the surface of a circular substrate made of glass or plastic, for example. A thick section or reference position mark 11 is provided near the center. Further, the optical disc 1 has a reference position mark 1
It is divided into 256 sectors from 0 to 255, with 1 being 0.

On the optical disk 1, fixed length information is recorded over a mantissa block, and the optical disk 1
Information of 300,000 blocks is recorded in the rack 36,000 above. The number of sectors in one block on the original disk 1 is, for example, 40 sectors on the inner side and 20 sectors on the outer side. In addition, if each block does not end at the sector switching position, a block gap is provided as shown in the first block and the first block shown in FIG. 4, so that each block always starts at the sector switching position. ing. A block header A consisting of a block number, track number, etc. is recorded at the start position of the block, for example, when the original disc 1 is manufactured.

As shown in FIG. 5, the original disk 1 is composed of an innermost track, a non-recording track, a querier area 1m, a user-inaccessible area lb, and a user-accessible area 1c. The non-recorded track area 1 & consists of, for example, the innermost 10 tracks, and is provided as a margin area for detection and alignment correction of the innermost track. The above-mentioned user-inaccessible area [C] is made up of blocks corresponding to an access error since the optical radar 12 described later is accessed when accessed, and is made up of, for example, 200 blocks (hex). Only the Glock header A is recorded in each program in this user-inaccessible area 1b.

The user accessible area 1c is composed of a defective block management information recording area 1d and a data recording area 1e. In the defective block management information recording area 1d, defective block management information consisting of the (start) address of the defective block and the number of consecutive defective blocks is recorded. The defective block management information is recorded as shown in Table 1, for example.

Table 1 and FIGS. 6(a) and 6(b) show the recording format of fixed length blocks recorded along the track grooves on the optical disc 1. The above block is composed of a block header area and a data area. The block header area is composed of 39-byte preamble data indicated by 'B3', a pre-header consisting of 8 frames, and an additional recording header consisting of 4 frames. Between the above-mentioned green header and additional recording header. is provided with one frame with a slicing gag caused by the recording time lag.

The above header is a header that is written in advance before the user records data on the optical disc 1, and the additional recording header is recorded before the tK encoded data of the header of that block when recording data of this block. This is the header.

Each frame of the above pre-header consists of 39 bytes,
1-byte header frame synchronization code (block synchronization code), 8-byte forward and reverse polarity header address data, and 22-byte 'B3 as dummy data.
”...For example, positive polarity is rlol
oJ, the opposite polarity is rolol J
It becomes. The header address data consists of a 1-byte frame number in the header, a 3-byte block number, a 2-byte track number, and 2-byte "00" data as dummy data. The frame number in the above header is 121ii11 in the same block header.
This is a number that identifies each frame, and is assigned in order from 1 to 12. The above header frame synchronization code is, for example, a Rolo code that is obtained by modifying a part of encoded data obtained by modulating "B3" data according to 2-7 code conversion.
11071 called oloooooooooooo J is 8
Encoded data arranged in rows is recorded.

This encoded data is demodulated as B3'' in the case of VI modulation.Furthermore, frames with splice gear lag include a 1-byte header frame synchronization code on the Nori header side, and 8-byte header address data of both forward and reverse polarities. , 2-byte dummy data, 2-byte suno rice gyatto used for connection during recording, and 18-byte dummy data on the additional recording header side.

Each frame of the above additional recording header consists of 39 bytes, including a 1-byte header frame synchronization code, 8-byte forward and reverse polarity header addresses, 16-byte secret code (for example, PIN code, operator code, etc.), and 6-byte header address. 'B3' as dummy data.The above secret code is the same as the secret code stored corresponding to the search data described above, and includes sb, an 8-byte generation secret code, and an 8-byte search code. The above-mentioned secret code is set as necessary, and if it is not set, dummy data is recorded in that area.

The above data area consists of 152 data frames9.
The valley data frame is obtained by modulating the recording data by 2-7 modulation, and consists of a 1-byte (data) 7L/-M code and 38 bytes of frame cutout data. The above frame synchronization code is, for example, RO which modulates "B3" data according to the 2-7 code conversion shown in Table 2 below.
xo.

Encoded data 100000001000J is recorded. As a result, the fixed length data within the data block is divided into 152 fixed length data. The frame synchronization code is used to resynchronize code break positions during code decoding and to resynchronize data frames. Further, each frame is given its own ECC code (error correction code) for error checking.

Table 2 In other words, as shown in FIG. 7, the control circuit 15, which will be described later, interleagues 4-byte (fixed length) block data from the user, interleagues it in the ECC addition time wI31, and converts it into an ECC code (error correction code). ) and add 577
This data is converted into 6-byte encoded data, this data is cut out into frame data of every 38 bytes by the frame cutting circuit 32, and a frame synchronization code is added to this frame data by the frame AIJ code adding circuit 33, resulting in 39-byte frame data. It is designed to output 152 frames.

The frame synchronization code has a pattern in which the modulated code has seven consecutive O#s.

This pattern of 7 consecutive ONs is
1 byte of data is “F3”, “33”.

It can be seen from the 2-7 conversion table shown in Table 2 that it will occur when either B3'' (hexadecimal).
The suffix of a code with 7 consecutive 0''s must be [・
. . 100000001000J, and the boundary when demodulating from code to data can be determined by detecting a pattern in which seven consecutive numbers 0# are detected. In other words, it is now possible to resynchronize the decoding boundaries.

2 bits for 2-7 modulation of recording data.

The 3-bit and 4-bit variables encode 4 bit strings, and the frame synchronization code is "33" or B3.
”, when it is “33”, it is 0”
711fi consecutive turns may occur twice in a row, and if the synchronization code is detected by detecting a pattern of seven consecutive 0''s, the synchronization code will be detected in the middle of a 1-byte synchronization code. There is a possibility of doing this.

Therefore, among the 2-7 code conversion threads shown in Table 2, IIB3# is the most suitable 1-byte frame synchronization code. This results in a frame sync code″
By adding 'B3' to each frame, even if there is a bit shift during decoding, the frames can be resynchronized using the frame synchronization code.

The motor 2 shown in FIG. 3 is constituted by a Hall motor whose rotational speed is controlled by a speed control section 17, which will be described later. As shown in FIG. 8, the shaft 3 of the motor 2 has a
A disk 4 on which signal generation marks 4M are provided at regular intervals is fixed, and the marks 4M on this disk 4 are optically detected by a detector 7 consisting of a light emitting diode and a light receiving element. ing. Further, a detector 8 consisting of a light emitting diode and a light receiving element for optically detecting the reference position mark 11 is provided below the disk 1. The output of the detector 7 is supplied to the clock pulse input terminal of the sector counter 10 via the amplifier 9, and the output of the detector 8, that is, the output of the light receiving element is supplied to the clock pulse input terminal of the sector counter 10. The output of is supplied via the amplifier section 11.

An optical head 12 for recording and reproducing information is provided below the original disc 1 so as to be movable in the radial direction of the optical disc 1. This optical head is well known and includes, for example, a semiconductor laser oscillator, a collimating lens, a beam snoritter, a λ/4 wavelength plate, an objective lens, and a light receiver. The output of the optical head 12 is supplied to a binarization circuit 13, and the signal binarized by the binarization circuit 13 is demodulated by a demodulation circuit 14 and supplied to a control circuit 15.

Well, the demodulation circuit 14 converts the signal from the binarization circuit 13 into 2-
For example, as shown in FIG. 9, the output of the shift register 41 stores the reproduced signal, and the output of the shift register 41 is used to perform resynchronization and resynchronization. Re-synchronization pattern detection circuit 42 that detects an arm turn, re-synchronization! An AND circuit 43 takes an AND between the output of the turn detection circuit 42 and the frame synchronization code detection mask, and the shift register 4 is operated by the output of the AND circuit 43.
The code extraction circuit 44 extracts the output from the code extraction circuit 44, and the data demodulation/frame resynchronization circuit 45 demodulates the output of the code extraction circuit 44 by inversely converting the mark conversion code according to the output of the AND circuit 43. There is. In other words, the resynchronization turn in which the demodulation code contains seven consecutive 0#s is the first
As shown in FIG. 0, the resynchronization/mother turn detection circuit 42 generates a resynchronization pattern detection signal. This resynchronization 9th turn detection signal is the 11th turn detection signal.
As shown in the figure, the frame synchronization code of the previous frame and the frame synchronization code detection mask generated after a certain time interval from the position detection timing are ANDed in the AND circuit 4.
3, and resynchronizes the code decoding delimiter position at the timing when the AND is established. In addition, the frame synchronization code detection mask is normally one bit, but when data is re-cut out due to frame synchronization, the resynchronization pattern detection signal is set at the bit position where it should originally be generated, as shown in Figure 12. The front plate is made to have a width of 3 bits between each side.

By providing such a width to the frame synchronization code detection mask, even if a bit shift occurs during data demodulation and is demodulated, the shift can be corrected if the shift is within 3 bits before and after. This is the timing at which resynchronization pattern detection indicates a byte break in the frame synchronization signal. Even if the frame synchronization code is encoded between the preceding and following data, there is no regular resynchronization pattern within 3 bits before and after. This is because it does not include this twisted /4' turn. Therefore, by adding a frame synchronization code to each frame data, frame synchronization can be performed even if a shift in the delimiter position of the code S reading or software within ±33 bits of the demodulated data occurs during data demodulation. be.

Further, the control circuit 15 controls the entire apparatus according to signals from the main control device 5. The above control circuit 1
For example, when a block number for recording or reproduction is supplied, the block number 5 calculates the track number and start sector number to be accessed according to the conversion table stored in the storage circuit 16, and also obtains speed information.

It is. As shown in FIG. 13, the storage circuit 16 contains speed information of the source disk 1 for each 256 tracks, the number of sectors of 1f lock at this speed, and the number of the first program in the 256 tracks at the above speed. A conversion table is stored that corresponds to the start sector of the block. For example, when the control circuit 15 is supplied with block number "10" from the main controller 5, the block number is set to θ according to the memory contents of the memory circuit 16.
~255 tracks, the block number of the first block in that track is "0" and the starting sector is "0".
0", the number of sectors in one block is "40", and the number of tracks and sectors of block number "10" are calculated accordingly. That is, r-((target block number-
First block number) x number of sectors (starting sector) ÷ 25
6+track number of the first block", the quotient obtained is the number of tracks and the remainder is the number of sectors. In this case, track "1" starting sector r144J is calculated.

The control circuit 15 rotates the motor 2 so that the track of the optical disk 1 relative to the optical head 12 has a constant linear velocity by controlling the speed control unit 17 according to the speed information obtained at the time of access. It is something.

Furthermore, when the track arrival amount is calculated, the 1e+J circuit 15 converts the track number into a scale value, and drives the linear motor until this scale value matches the position detected by the output of a position detector (not shown). driver 18
It is designed to drive and control. The linear motor driver 18 is configured to move the optical head 12 using an IJ near motor mechanism 19 under the control of the control circuit 15 so that the beam source of the optical head 12 illuminates a predetermined track. The linear motor mechanism 19 moves the optical head 12 in the radial direction above the original disk 1. Further, the control circuit 15 causes the optical head 12 to start recording and reproducing operations when the optical head 12 corresponds to the target track at the time of access and when the start sector and the count value of the sector counter 10 match. is.

Mata, the above flflJ Go'INr 15 Ha Lord? t
The recorded data from the fLl 1a1 device 51 is transferred to the transformation circuit 2.
The signal is modulated by 0 and supplied to the laser driver 21. The radar driver 21 records information by driving a semiconductor laser (not shown) within the optical head 12 in accordance with a modulated signal supplied thereto.

Further, the control circuit 15 detects a defective block by detecting a header frame using the timer 22 and the timer 23, stores the defective block detection result in the storage circuit 16, and when the defective block detection is completed. , is recorded in the defective block management information recording area 1d. Further, the control circuit 15 causes the header counter 24 to count the number of header frames detected for each block. The timer 22 operates for the playback time from the block header to the block header of each block, and the timer 23 defines the reading time of the block header for each block.

Next, the operation in such a configuration will be explained. For example, now, select and set the key go-to drawer 3 registration mode and enter a search need for image information to be registered. For this,
The CPU 52 checks the validity of input data using 9-digit character types according to the predefined horizontal code format (cyclic redundancy check, CRC check).
Also, the search codes that have already been registered are checked to see if there is any double registration, and if the horizontal code is correct as a result of these checks, it is stored in the main memory 53.

In addition, input the size of the manuscript, the secret code for generation, the whistle code for search, etc. using KeygoDro 3. in this case,
The secret code for generation and the secret code for search are input as appropriate depending on the importance of the image information on the manuscript, etc., and are not input unless necessary. The above input data is also stored in the main memory 53 in correspondence with the search code. Then, the original is set on the two-dimensional scanning device 60, and the CPU J
2 operates the original disk device 62 and the two-dimensional scanning device 60. The two-dimensional scanning device 60 two-dimensionally scans the image information of the set document and photoelectrically converts it.

This photoelectrically converted line information is sequentially stored in the page buffer 54. When one page of image information is stored in this page buffer 54, the image information is stored in the display interface 57 in a fresh memory (not shown).
The image information is stored in the CRT display device 6.
4 is displayed.

By the way, if the image displayed on the CRT display device 64 is satisfactory, a recording key (not shown) is turned on. Then, the CPU 52 performs band compression on one unit of Ii!li image information stored in the buffer 54 for each line information using the well-known MH (Modify Hoffman) conversion in the compression/expansion circuit 55, and performs the compression. The line information thus obtained is supplied to the optical disk device 62. Accordingly, the original disk device 62 records the supplied image information on the optical disk 59.

That is, the CPU 52 sends the recording data and the recording address (
block number) is supplied to the control circuit 15. Then, the control circuit 15 uses the conversion table in the storage circuit 16 to calculate the track, start sector, and speed information of the target block. That is, the control circuit 15 determines the range and speed information of the track that includes the target block number in the conversion table, and converts the range of "((target block number - first block)" according to the range data of the track. number) ×
The following calculation is performed: tens of sectors (start sector) ÷ 256 + track number of the first Glock, and the track number and start sector of the target block are calculated from the result of this calculation.

Thereby, the control circuit 15 controls the speed control section J7 according to the speed information. Then, the speed control section 17 drives the motor 2 to rotate the optical disc 1 at a rotation speed corresponding to the track. Also, based on the track number, the control circuit 15 converts the track number into a scale value, and drives the linear motor driver 18 until this scale value matches the position detected by the output of a position ejector (not shown). By doing so, the optical head 12 is moved.

Next, the control circuit 15 controls the laser driver 2 when the count value of the sector count 1o matches the start sector.
1 is driven, followed by a 2-byte Snorice gap, and 4 is written as an additional recording header (additional recording address data).
One header frame is recorded, and following that recording, a data frame of the block 152 is recorded in the recording data. That is, when the 8th frame of the green header becomes the 19th byte, 18 bytes of dummy data ("00") is recorded after 2 bytes (tin rice gear lag) from the end position of the preheader. Subsequently, four header frames (39 bytes each) are recorded. This 4-horn header frame contains the header frame synchronization code recorded in the pre-header described above, header address information of opposite phase and positive phase, encrypted data (8 bytes) as a secret code for generation, and secret code for search. The encrypted data (8 bytes) is recorded. Then, 1
152 data frames each consisting of a byte frame synchronization code and 38 bytes fixed length data are recorded. That is, the control circuit 15 interleaves the 4-byte recording data, adds interleap and FCC with the Ecc addition circuit 3, converts it into 5776-byte encoded data, and converts this data into 38-byte encoded data with the frame extraction circuit 32.
A 1-byte frame synchronization code is added to this frame by a frame synchronization code adding circuit 33, and frame data of every 39 bytes is output for 152 frames. This output is supplied to the laser driver 2-1 via the modulation circuit 20. Thereby, the laser driver 21 drives a semiconductor laser (not shown) in the optical head 12 in accordance with the supplied data, thereby recording the data subsequent to the additional recording header on the optical disc 1.

In addition, other data is also recorded in a predetermined block.

When the recording of image information is finished in this way, the CPU
52 stores recording addresses such as block numbers, track numbers, and stroke lengths in which image information is recorded in the main memory 53 in correspondence with search codes. Next, the CPU
52 is the search data stored in the main memory 53;
A search code, a block number, a track number, an image length, a secret code for generation, a secret code for search, etc. are supplied to the magnetic disk device 67. Accordingly, the air disk device 67 stores the supplied search data on the magnetic disk 68. Thereafter, other image information is recorded on the optical disc 19 in the same manner.

Next, a search for image information registered as described above will be explained. First, the search mode is set using the keypad 63 and the search code is input. Then, the CPU 52 sequentially compares and collates the search code with the search codes stored on the magnetic disk 68, and sequentially checks whether the search code matches the input search code. For matching search codes, specify the presence or absence of confidential code in the selected search code'+ft
If the information This set search secret code and the search secret code of the selected search code are compared, and if the two match, the search operation is started for the first time.As a result,
A block of image information corresponding to the search code is searched. Then, the CPU 52 reproduces the track on the optical disk 59 corresponding to that track number from the original disk H.
Perform it on IIIi62. That is, the reproduction block number is supplied from the CPU 52 to the control circuit 15.

Then, the iυII N circuit 15 uses the conversion table in the storage circuit 16 to calculate the track, start sector, and speed information of the target block. That is, the control circuit 15
determines the range and speed information of the track that includes the target block number in the conversion table, and calculates the following formula according to the track range data: ((target block number - first block number) x number of sectors + starting sector )÷256+track number of the first block", and the track number and start sector of the target block are calculated from the result of this calculation. Thereby, the control circuit 15 controls the speed control section 17 according to the speed information. Then, the speed R1
The control unit 12 drives the motor 2 to rotate the optical disc 1 at a rotation speed corresponding to the track. Further, based on the track number, the control circuit 15 converts the track number into a scale value, and drives the linear motor driver 18 until this scale value matches the position detected by the output of a position detector (not shown). Okay, move the optical head 12. Next, when the count value of the sector counter 10 and the start sector match, the control circuit 15 drives the laser driver 21 to start reading the optical disc 1. As a result, the read signal is binarized by the binarization circuit 13 and demodulated by the demodulation circuit 14.
supplied to

The trowel adjustment circuit 14 performs inverse conversion of the supplied binary signal (code) into a 2-7 conversion code and outputs it to the control circuit 15. As a result, the control circuit 15 compares each eight bytes of opposite-phase header address data reproduced following the header frame synchronization code with the positive-phase header address data, bit by bit, using exclusive OR. , the exclusive sum operation results are all "1", and the frame number of the header frame is "1 to 12",
It is determined that the header frame has been read correctly. In this case, the number of header frames to be decoded may be one or more. Next, the control circuit 15 checks whether the address data matches the address data of the block to be reproduced, and if they match, causes the additional recording header recorded following the green header of the header frame to be reproduced. The secret code for generation and the secret code for search are read from this additional recording header frame, and the control circuit 15 outputs them to the CPU 52. Then, the CPU 52 retrieves the search secret code set by the operator mentioned above and the optical disk device 6.
Compare ' with the search aircraft command code supplied from 2, and if the two match, it is determined that the image information is being read,
The signal is output to the optical disk device 62. As a result, the optical disc device 620 control circuit 15 starts data reproduction of the corresponding block.

Then, the read signal is also binarized by the binarization circuit 13 and supplied to the demodulation circuit 14. Then, the supplied binary signal (demodulated signal) 1 is supplied to the resynchronization pattern detection circuit 42 and the code extraction circuit 44 via the SAZOFT processor 41. As a result, the resynchronization pattern detection circuit 42 outputs a resynchronization pattern detection signal to the AND circuit 43 when seven consecutive bits of "0" are supplied.

At this time, based on the previous frame (in the case of the first frame data, based on the synchronization timing of the next frame)
If the frame synchronization code detection mask signal is supplied, the AND circuit 43 is established, and the timing signal from the AND circuit 43 is supplied to the code extraction circuit 44 and the data demodulation and frame resynchronization circuit 45. Accordingly, the code extraction circuit 44 extracts the demodulated signal from the shift register 41 using the timing signal from the AND circuit 43, and the data demodulation and frame resynchronization circuit 45 also uses the timing signal to demodulate data and resynchronize the frame. I do. In this way, 152 frame V-frame data are 11th-order demodulated and supplied to the control circuit 15.

If the frame synchronization master turn detection signal and the frame synchronization code detection mask do not match and the timing signal is not output, the frame synchronization code detection mask is expanded to 7 bits as described above and the above operation is repeated again. It looks like this. This allows rereading to be performed reliably even if bit shift occurs.

Furthermore, data in other blocks are also reproduced in the same manner as described above.

The image information (compressed information) from the optical disk device 22 is supplied by the CPU 52 to a compression/expansion circuit 55 for each scanning line, and subjected to band expansion by MH inverse conversion, and the original 1# information is transferred to the page buffer 54. sequentially supplied to In this way, when all the image information for the reproduced page is stored in the page buffer 54, the CPU 52 stores the image information in the
It is displayed on the RT display gray device 64 or recorded on the recording device 65.

Furthermore, when performing generation processing such as changing or deleting image information, the secret generation code in the selected search code, the input secret generation code, and the Unless the search code of the block matches the secret code for generation of the corresponding block, generation processing such as change, deletion, etc. will not be executed.

As mentioned above, when recording 1iI111# information, a confidential code is added to the search code corresponding to the image information, and a confidential code is also added to the additional recording header of the corresponding block of the optical disc, thereby protecting the confidentiality of the image information. As a result, optimal security protection can be performed according to the importance of the 1gl1 image information, and an excellent function can be achieved in terms of strict security protection.

In addition, in the above embodiment, the case where the confidential code is stored in the search data of the magnetic disk and also recorded on the optical disk has been described, but the present invention is not limited to this, and the same can be implemented in the case where the secret code is recorded only on the original disk. . Also, I used the secret code P for generation and the secret code for iPtPt crosspiece,
The number is not limited to this, and either 10,000 may be used.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a data recording and reproducing device that can securely protect data security and improve reliability.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention, and FIG. 1 is a schematic block diagram of an image information file device, FIG. 2 is a diagram for explaining the structure of search data, and FIG. 3 is an optical disk. A schematic configuration diagram of the device, FIGS. 4 and 5 are plan views showing the configuration of the original disk, FIG. 6 is a diagram showing an example of the block format, FIG. 7 is a diagram showing the configuration of the main part of the control circuit, FIG. 8 is a diagram for explaining the relationship between the optical disc and the detector, FIG. 9 is a diagram showing the configuration of the main part of the demodulation circuit,
0 figure is resynchronization/1? Figures 11 and 12 are diagrams for explaining the turn detection signal, Figures 11 and 12 are diagrams showing the relationship between the frame synchronization code position detection signal and the frame synchronization code detection mask, and Figure 13 is a diagram showing an example of storage of conversion data. be. DESCRIPTION OF SYMBOLS 1... Optical disk (recording medium), 12... Optical head, 13... Binarization circuit, 14... Modulation circuit, 15
... Control circuit, 17... Speed control section, 18... Linear motor driver, 19... Linear motor mechanism, 2
0...Modulation circuit, 21...V-the-dry noma, 3...Interleaze, ECC addition circuit, 32...Hummu extraction circuit, 33...Frame synchronization code addition circuit, 41... Shift register, 42... Re-synchronization/Zeta-7 detection circuit, 43... AND circuit, 44... Code extraction circuit, 45... Data demodulation, frame re-synchronization circuit,
5th... Main control device, 52... CPU, 53...
Main memory, 60... Two-dimensional scanning device, 61...
Original, 62... Optical disk device, 63... Key is -
64...CRT display device, 65...recording device, 67...magnetic disk device, 68...magnetic disk. Applicant's Representative Patent Attorney Takehiko Suzue Figure 3 Figure 4 Figure 7 Figure 9 Figure 10 Figure 11 Figure 12 Procedure Amendment Act January 9, 1939 Commissioner of the Patent Office Kazuo Wakasugi Japanese Patent Application No. 58-222579 8 Name of the invention Relationship with the Nagisa case for amending data recording and re-exporting device Patent applicant (307) Spontaneous amendment by the representative of Tokyo Shibaura Electric Co., Ltd.

Claims (3)

[Claims] (1) A means for inputting a confidential code in a data recording/reproducing device that divides a track on a recording medium into blocks and records or reproduces data; - Adding a confidential code to a necessary block when recording said data; and a recording means for recording data, and when reproducing data, when a confidential code is added to a block of data to be reproduced, whether or not the code input by the input means matches the confidential code of the corresponding data. 1. A data recording/reproducing apparatus comprising means for determining the data and reproducing the data only when the data match. (2) The data recording/reproducing device according to claim 1, wherein the secret code is recorded before the data. (3) The data recording/reproducing device according to claim 1, wherein the @ secret code is encrypted data. (4) The data recording and reproducing apparatus according to claim 1, wherein the secret code is composed of a secret code for generation and a secret code for search.