JP2550185B2 - Data recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus which is preferably implemented as a magnetic recording / reproducing apparatus and an optical recording / reproducing apparatus.

Conventional technology For example, when data is input from the outside and is recorded on a recording medium such as a tape, conventionally, the data to be recorded is divided into certain information units, and for each information unit, management data for identification In addition to this, a configuration for recording on a recording medium is used.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention When retrieving the contents of data recorded as described above, it is necessary to reproduce all recorded data and find the desired data from among them. A long time corresponding to the reproduction time was required.

An object of the present invention is to provide a data recording / reproducing device that can search for desired data in a short time.

Means for Solving the Problems The present invention provides a data compression means for compressing input data, a storage means for storing compressed data, and input data recorded on a recording medium, in which all or predetermined data recording is performed. A data recording / reproducing apparatus comprising: a recording control means for recording the compressed data stored in the storage means in a predetermined area of a recording medium when a predetermined amount of data is completed.

Operation The data recording / reproducing apparatus according to the present invention comprises a data compression means, a storage means, and a recording control means, and the recording control means records the input data divided into information units on the recording medium at the same time when recording the data. The compression means performs data compression suitable for each type of data by the compression means, and stores the compressed data in the storage means. When the recording of data is completed for all or a predetermined amount,
The recording control means records the compressed data stored in the storage means in a predetermined area of the recording medium.

Therefore, at the time of reproduction, the recorded content of the recording medium can be immediately known by reproducing the area in which the compressed data is recorded, and the search time can be significantly shortened.

Embodiment FIG. 1 is a block diagram showing an electrical configuration of a data recording / reproducing apparatus 1 according to an embodiment of the present invention. Data recording /
A reproducing device (hereinafter referred to as a device) 1 is roughly divided into a tape drive system 2, a control system 2, and a signal system 4, and uses a magnetic recording tape (hereinafter referred to as a tape) 5 as a recording medium.

The tape drive system 2 includes a drive device 6 including a motor and a power source (not shown), a capstan 7, etc., and rotates the capstan 7 in response to a command from the control system 3.
The tape 5 is run.

The control system 3 includes a microcomputer 8 which is recording control means, an interface 9, and a memory 10 which is storage means.
And the like, and exchanges commands and data with the host computer 11 connected to the microcomputer 8 via the interface 9. The interface 9 is also interposed between the microcomputer 8 and the signal system 4 to manage input / output data.

The signal system 4 is a rotary head 12 that rotates in sliding contact with the tape 5.
A recording amplifier 13 and a reproducing amplifier 14 connected to the rotary head 12, a data modulation / demodulation circuit 15, and a data compression circuit 16 which is a data compression means. As will be described later, the data compression circuit 16 thins out the input data, for example, in the case of image data, thins out the data, calculates the difference in the case of recording position data, and the like for each data type. Optimal data compression. The compressed data indicates the content of the input data and is stored in the memory 10 as search data described later.

Next, the operation of this embodiment will be described with reference to FIG.
When recording data, the line from the host computer 11
l1-The recording command is transmitted to the microcomputer 8 via the interface 9. The microcomputer 8
In response to this recording command, the tape drive device 6 is activated to rotate the capstan 7, and the tape 5 is run in a predetermined direction.

Next, the microcomputer 8 requests recording data from the host computer 11,
From 11, the unit recording data Di such as image data
(I = 1,2,3, ..., n, reference numeral D is used for generic name)
Are sequentially sent to the control system 3. The sent recording data D is sent to the signal system 4 via the interface 9,
The data is supplied from the data modulation / demodulation circuit 15 to the recording head on the rotary head 12 via the recording amplifier 13 and recorded on the tape 5.

At the same time, the input recording data D is given to the data compression circuit 16 via the interface 9, is subjected to the data compression processing as described above, and then is stored in the memory 10 together with the data number (i). .

After that, the same operation is repeated, and as shown in FIG.
In the data recording area W1 on the tape 5, recording data D1, D2,
D3, ..., Dn are recorded. Further, the memory 10 stores compressed data B1, B2, ..., Bn corresponding to the respective recording data D1 to Dn (reference numeral B is used when collectively referred to).

When the recording of the final data Dn is completed, the microcomputer 8 commands the drive system 2 to rewind the tape 5, and the tape 5 is rewound to the tape start position.

Here, the microcomputer 8 runs the tape 5 again, and at the same time, the compressed data B stored in the memory 10
Are sequentially read and sequentially recorded in the index area W2.

In this way, at the beginning of the tape 5, the compressed data B in which the individual contents of all the contained data D are compressed is recorded. During reproduction, the control system 3 reads this compressed data B and transmits it to the host computer 11. The host computer 11 displays the compressed data B as search information on a display device (not shown) or the like. Therefore, the recorded contents of the tape 5 can be confirmed in a short time, and the search time for desired data can be significantly shortened.

Although the compressed data B is recorded at the start end of the tape 5 in the above-described embodiment, it may be recorded at the end or after the final data Dn as another embodiment of the present invention. The compressed data B may be recorded every time the recording data D is recorded by a predetermined fixed amount.

As described above, the data recording / reproducing apparatus according to the present invention is
At the time of data recording, input data divided into information units are recorded on a recording medium, and at the same time, the data compression circuit performs individual data compression on the individual data, and then stores the compressed data. Since the data is recorded in a predetermined area, it is possible to know the contents of all the stored data by reproducing only the area, and it is possible to significantly reduce the time required for the search.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a data recording / reproducing apparatus 1 according to an embodiment of the present invention, and FIG. 2 is a diagram showing a data recording area on a tape 5. 1 ... Data recording / reproducing device, 2 ... Drive system, 3 ... Control system, 4 ... Signal system, 5 ... Magnetic recording tape, 8 ... Microcomputer, 9 ... Interface, 10 ... Memory , 11 …… host computer, 12 …… rotary head,
15 …… Data modulation / demodulation circuit, 16 …… Data compression circuit

Claims (1)

(57) [Claims] 1. Data compression means for compressing input data, storage means for storing the compressed data, input data recorded on a recording medium, and all data recorded,
Alternatively, the data recording / reproducing apparatus includes a recording control unit that records the compressed data stored in the storage unit in a predetermined area of the recording medium when the predetermined amount of data is completed.