JPH01290148A - Image information filing device - Google Patents

Abstract

PURPOSE:To perform the recording and reproduction of a large amount of image data by recording the image data and managing information on plural tracks recorded obliquely on a magnetic tape, and performing the reproduction by varying search speed based on the difference of the position of a desired track and that of the present track. CONSTITUTION:Data managing information is recorded on a part (sub data area of a rotary head type digital audio tape recorder R-DAT1) of the plural tracks T1-T4 recorded obliquely on the magnetic tape 1-1 by using the R-DAT1, and the image data is recorded on another part (PC area of the R-DAT1). And a means 3 to search those data is provided, and the speed of search is decreased as approaching targeted tracks T1-T4. In such a way, it is possible to record the large amount of image data in large quantities, and also, to read out and reproduce them rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image information recording device using a magnetic tape capable of recording, reproducing, and erasing a large amount of image data.

(Prior Art) Conventionally used image information 7 eyering devices include the following.

+1+ A device that applies photographic technology A device that uses photographic technology to record the image of an original onto a strip or sheet of film, and reproduces it by shining light onto the film; (2) A device that applies a computer storage device. A device that records and reproduces digitized image data by treating it as coded data using compression means such as MH encoding (hard disk device, floppy disk device, etc.); (3) Optical disk application device A device that uses laser light to read out image data digitally recorded on a disc-shaped storage medium using laser light; (4) Magneto-optical disc application device Apparatus for digital recording and reproduction using changes in magnetization (Problem to be solved by the invention) The apparatus described in (1) above takes time to record, and has a large volume and storage capacity.

It is inconvenient in terms of searching, the device (2) can record a fairly large amount of image data, but the overall capacity is still insufficient, and the device (3) can record a large amount of image data. However, it is difficult to erase the recording on the disc in use and immediately start recording something else, and although the device (4) can erase the recorded data and immediately start another recording, It was expensive.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a rotating head type digital audio tape recorder (R-DA).
T) is used to record large capacity and low price.

It constitutes a reproducible image data file, and data management information is recorded on some of the tracks (sub-data area of R-DAT) diagonally recorded on the magnetic tape, and other -i (R - Equipped with means for recording image fist data in DAT (DPCM area) and searching them;
In addition, the search speed was made to slow down as the vehicle approached the target track.

(Function) According to the present invention, by using a commonly used R-DAT and adding some parts, a large amount of image fist data can be recorded in large quantities, and quickly read and played back. . Since R-DAT has an extremely large capacity (120-minute tape has a total of 2.2 GB, υ, P
CM data area is 1.13GB.

(The sub-data area is 0.9 GB), in particular, a large amount of image data can be recorded without using compression means such as MH encoding.

Encoding allows even larger amounts of data to be recorded.

(Example) FIG. 1 is a block diagram showing the configuration of the present invention.

The controller 2 shown in FIG. 2 is connected to R-DATI, and the controller 2 has a scanner 3 and a printer 4.
．． And a display device CRT5 such as a cathode ray tube is connected. The scanner 3 optically reads a document such as characters and figures, converts it into an electrical signal, converts it into a digital signal, and inputs the image data to the controller 2 .

The printer 4 converts image data converted into a digital signal into an image that can be visually recognized using a thermal head or the like. In response to commands from the controller 2, the R-DATI records and reproduces digitized image data on a portion of the magnetic tape, and records and reproduces data management information on other portions of the magnetic tape.

The controller 2 includes an R-DATI, a scanner 8, a printer 4. It controls starting, stopping, etc. of the CRT 5, etc., and also performs image data display and keyboard input. FIG. 2 is a block diagram of the CPU 21. ROM22. R.A.
M23. DMA24, CRT control for cathode ray tube
C25゜Key input interface KEY I/F
27゜Scanner interface 5CANNERI/
F28° Graphic RAM29. Printer interface PRINTERI/F 80. R-DAT I/
F31 is connected. They are supplied with the necessary power by a power supply 82. Also, graphic RAM
29 is connected to the CRTC 25, and the output of the CRTC 25 is supplied to the CRT 5 via a driver 26. Keyboard, scanner8. The printer 4°R-DATl etc. is connected to the ROM 22. by the CPU 21 via each interface.
RAM21. It is punctured and controlled by the DMA 24, etc., and the necessary display is displayed on the CRT 5.

Figure 3 shows the configuration of R-DATI, and Figure 4 shows the configuration of R-DATI.
2 is a schematic diagram of the track pattern of T. These standards are
It was defined in detail by the DAT conference held in April 1986, and this application will only outline its outline. A widely used magnetic tape l-1 for R-D AT, which is housed in a case, contacts the rotating magnetic head 1-2 at a certain angle, and has a track pattern as shown in FIG. Perform recording and playback. The head amplifier circuit 1-3 amplifies the reproduction signal from the rotating magnetic head 1-2, and also amplifies the recording signal in accordance with the head characteristics during recording. The servo circuit 1-4 operates the rotating mother air head 1-2 by pulses etc. from the rotating magnetic head l-2.
The rotation speed is controlled by applying feedback to the rotation. The error correction circuit 1-5 performs error correction using a double Reed-Solomon code, which is error correction based on the R-DAT format. Image data
Inter7Ace circuits 1-6 are R-DA for the present invention.
It is added to T and has the function of passing image data to be recorded and reproduced to and from the controller, and has two data lines and one clock line.

! The chip microcomputer control circuit 1-7 controls switching between recording and reproduction, high-speed search, and the like. host computer
The interface circuit 1-8 is connected to a host computer (
Reception and transfer of commands such as playback and recording from the controller (controller) are performed, and data is recorded as shown in the format of the fourth factor. Each of these circuits is connected as shown in the figure.

In FIG. 4, the magnetic tape 1-1 includes diagonal TI,
T2. T8. Data is recorded on tracks such as T4, etc., and in the case of a normal R-DAT, sub coat portions 5C-1 and 5C- at both ends of each track are used.
2 is the tape position.

Time, etc. are recorded, and in the PCM section in between, music data converted into PCM is recorded. In this embodiment of the invention, subcode portions 5C-1,
5C-2 records the tape position and other data management information, and the PCM section records image data converted into PCM.

Since R-DAT standardizes data recording using PCM, if image data is also recorded using PCM, a common circuit can be used. However, it is also possible to record other digital codes.

The solid line arrow 16FF and the dotted line arrow 20OFF in FIG.
It indicates the direction of the search, and the search speed of 20OFF is faster than that of 16FF. Through this search, while reading the management information of the subcode sections 5C-1 and 5cm2, fast winding is performed until the desired file position is read. In this case, the speed of fast winding is changed depending on the magnitude of the difference between the target file position and the current position, as will be described later. In the figure, R-
Margins and ATF (Automatic Trackin) placed before and after subcodes according to the DAT standard
gFinding) is omitted.

When the desired file is found, playback and recording are performed. When recording, subcode section 5C-1
, 5C-2 and other data that does not need to be changed can be left unchanged, and after-recording can be performed by rewriting only the image session data in the PCM section.

In this way, an image data file can be constructed without breaking the audio format standardized by R-DAT, and even if there is an abnormality in a few pieces of data, the image data file as a whole can be Taking advantage of the characteristic of image data that there are no problems, acoustic error correction can be used in its entirety. If image data were to be recorded and played back without being compressed and encoded, the error correction ability would be equivalent to the error rate of R-D AT for audio (approximately 10), which would be sufficient for practical use, and a format shared with that for audio would be possible. It can be used.Incidentally, hard disks etc. have 10
Lower error rate.

Regarding the format of the file used in the above-mentioned present invention, please refer to the patent application filed on August 7, 1986 by the present applicant.
8-53197.

A means for rapidly reading virtual image data recorded on magnetic tape will be described below. First, as shown in Fig. 4, adjacent tracks record data at different azimuth angles, two tracks constitute one frame, 25 frames constitute one unit, and 16 units constitute one block. It is assumed that 720 blocks are stored on one tape. A desired recording/reproducing position is specified by the host computer or controller using this block number e(m) and unit number (match). In the subcode sections 5C-1 and 5C-2 of the tape, pre-allocated blocks, unit frames, etc. are recorded as described above.

FIG. 5 shows a block configuration of a speed changing RAM built in the one-chip microcomputer control circuit 1-7 shown in FIG. It is constituted by a register 52 and a speed table 58.

The start register 5 holds position data (block floor, unit position, etc.) transferred from the controller together with the search command.The start register 52 holds the block floor unit position of the track currently facing the rotating magnetic head. , frame N11'41-.The speed table 58 determines whether the servo circuits 1-4 in FIG. The numbers shown in table 58 represent the number of tracks, and since 1 unit is 25 frames and therefore 50 tracks, the number of units is multiplied by 50. W is 50 times the difference in unit Na between the start register 51 and the null register 52. Incidentally, REV means rewinding, FF means forwarding, and each value is a summary of the speed.

The sixth factor shows a flowchart of an example of traveling speed conversion.

In step 101, based on the search command sent from the controller and the position data to be searched,
The start register 51 is made to store the search block (NIL frame m, etc.).

In step 102, a standard feed rate IFF is set in the servo circuit 1-4.

In step 108, the block level, unit), Nl frame level, etc. recorded in the subcode of the current track are stored in the Nara register 52.

In step 104, the difference W between the data stored in the start register 51 and the null register 52 is calculated. When a difference between units is detected, it is calculated by multiplying it by 50 and converting it into the number of tracks, as described above.

In step 105, based on the table 58, either REV (13 steps) or forward feed (FF) (4 steps) is selected from the value of W. For example, when W=1000, feed is specified at 16FF (16 times the standard speed), and w=-+oo.

In this case, rewinding is specified at 16REW (16 times the standard speed).

In step 106, if the REV or FF stage designated in step 105 is not IFF (standard progressive speed), the process advances to step 107, and if it is IFF, step! Proceed to 09.

In step 107, the search speed specified in step 105, for example, 16FF, is set in the servo circuit 1-4.

In step 108, for example, the block fish is read from the subcode section, and if the blocks are 10 blocks apart, it is 8000) racks, so it is (50X 1
[6
Search with FF, and if the next subcode read is W≦512, it has entered the area of the specified block, so follow the Yes line and step 104.
Return to

Next, proceed to step 106, and if the difference in the number of tracks is 500, it is IFF, and the comparison with IFF is yes, so step! At step 09, a search is performed in the IFF, and the subcode designated by the start register 5I is compared with the actual subcode on the tape.

In step 110, recording and reproduction of nine tracks that coincide with step 109 are performed.

(Effects of the Invention) According to the present invention, by using a commonly used R-DAT and adding some circuits, a large amount of image data can be recorded and reproduced, and the desired data can be quickly obtained. Tracks can be detected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of its controller, and FIG.
The figure is a schematic block diagram of R-DAT, and Figure 4 is R-DA
Track pattern of T, Figure 5 shows RAM for speed change
The block diagram of FIG. 6 shows a flowchart of speed change. l...R-DAT% 2...Controller 8...Scanner, 4...Printer 51...Start register, 52...Nara register 53...Speed table man l 2 Coil 4 Figure 2 Figure $6 [21

Claims (1)

[Claims] 1. Multiple tracks recorded diagonally on a magnetic tape,
An image having image data and management information recorded on each track, means for specifying a desired track, means for varying the search speed depending on the difference between the desired track position and the current track position, and reproduction means. information filing device