JPS63311669A - Data recorder - Google Patents

Abstract

PURPOSE:To contrive the improvement of the error correction capability by recording an error correction code by 1-several frames every time a prescribed frame of digital signals is recorded at the recording. CONSTITUTION:A rotary head 11 is provided and two slanted tracks are formed by one revolution of the rotary head 11, and a device DAT 1 is provided, where the two slanted tracks are used as one frame and the digital signal is coded and recorded/reproduced so that the digital signal is finished in one frame. An error correction code by 1-several frames is generated by the circuit 25 with respect to the prescribed frame of the digital signal at recording and a microcomputer 22 records the frame of the error correction code to the boundary part of the recording at every prescribed frame. Thus, the error correction capability is improved and the re-recording of the required data is smoothed without destroying it by recording the data up to the frame of the error correction code at re-recording.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recorder for recording data in a combination computer or the like using a rotary head type digital audio tape recorder (DAT).

[Summary of the Invention] The present invention relates to a data recorder, which utilizes a so-called 1) Al recording device, and generates error correction codes for one to several frames for each predetermined frame of a digital signal during recording. By recording this at the recording boundary of each predetermined frame, the recorded digital signals can be collected and re-recorded smoothly.

(Prior Art) For example, in a combination computer, in order to save data written on a hard disk or the like, the data is transferred to a so-called data recorder and recorded.

In this case, as the above-mentioned data recorder, so-called analog audio tape recorders have conventionally been widely used. However, in such an analog tape recorder, the amount of recording media consumed is extremely large, the data rate during recording is low, so it takes an extremely long time to transfer and record, and it is also difficult to locate the beginning of the desired recording section. There are problems such as that it is not possible to easily perform the following.

By the way, DA't' (digital audio tape recorder) has been developed.
Published by wJ Sony Corporation Shibaura Factory: l5S803B9
-1131: December 1985 issue, pages 11-17, etc.) According to this DA°l, it was originally designed to record and play back digital signals, so the above-mentioned It is suitable for recording data.

However, in the case of L) AT like this, 3! The width is larger than the width of the normal recording head and the rack pitch, and part of the previous track is alternately erased to perform guard panless floating recording. For this reason, for example, when a part of recorded data is to be reproduced, edited, and re-recorded, it is difficult to re-record this data, even though reproduction and editing can be performed easily.

(i.e., as described above), when iTE recording of edited data is performed, the recording head is wide, so the next trunk that was recorded earlier may be erased. The data that should be saved will be destroyed.

In response to this, when recording data using a DAT, Hito previously proposed that an ampoule signal period be provided at the beginning and end of each recording so that the recording could be performed smoothly. (See Japanese Patent Application No. 6L314922 proposing a device). However, in the case of this device, re-recording must be performed for all the data recorded at one time, and when there is a large number of data, an extremely large amount of time is wasted for reproducing and re-recording. .

[Problems to be Solved by the Invention] As mentioned above, with the conventional technology, there are problems such as: l) When an AT is used as a data recorder, recorded data cannot be easily re-recorded; There was a point.

[Means for Solving the Problems j] The present invention has a rotating head, and one rotation of the rotating head forms two inclined tracks, and these two inclined tracks are used as one frame to perform digital A device (L)AT (1)) is provided which records and reproduces the coded signal so that the signal is completed within one frame. The error correction code for one to several frames is generated (circuit (22)), and the frame of this error 61 correct code is recorded at the boundary of the recording for each predetermined frame (microcomputer (22)).
) is a data recorder.

[Effect]

According to this, an entertainment correction code for one to several frames is recorded each time a predetermined frame of digital (A) is recorded during recording, so the error correction ability is greatly improved. By recording up to the frame of this error correction code when re-recording, re-recording can be performed smoothly without destroying the necessary data, thereby forming a good data recorder using this D A 'l'. can do.

〔Example〕

In FIG. 1, (11) shows the configuration of a DAT (1), which is provided with a rotating head drum (11), and a magnetic tape (12) is placed around the drum (11). It is being transported wrapped around a 90 degree range.

On this drum (11), 82 recording and reproducing heads A are provided at angular intervals of 180 degrees, and two inclined trunks are recorded and reproduced by one rotation of this drum (11). It has become so.

On the other hand, digital data from the outside is input to the 1o circuit (13), and from this 10 circuit (13), it is supplied to the digital signal processing circuit (14) where it is converted into the above-mentioned L)A'1'' formant. It will be done. This formatted signal is sent to the recording amplifier (15), the recording/playback switch (
16) is supplied to the heads A and B through the recording side contact,
Recorded on tape (12). Furthermore, when the signal recorded on the tape (12) is played back by heads A and B, this playback signal is supplied to the processing circuit (14) through the playback side contact of the recording/playback switch (16) and the playback amplifier (17). 10 circuits (
13) is output to the outside.

Furthermore, a control signal from the outside is supplied to the system control circuit (18), and this control circuit (
The signals from the control circuit (18) control the rotation of the head drum (11), the transfer of the tape (12), the switching of the switch (16), etc. During recording, the signals from the control circuit (18) 14) to form a predetermined subcode signal. Further, during reproduction, the signal extracted by the processing circuit (14) is supplied to the control circuit (19), where tracking and other controls are performed, and part of this signal is taken out to the outside.

With the above configuration, DA 'l' (11) is formed.In this device, a υA-AI) conversion circuit is provided outside the 10 circuit (13), and a control circuit (11) is provided outside the 10 circuit (13).
8) By providing a predetermined control device externally, it is possible to record and reproduce, for example, audio (analog) (?).

On the other hand, in the above-mentioned device, an arbitrary interface bus (3) is connected to the outside of the DAT (1) via the controller (2). interfnie here
SUHAS (31 and shite, for example, SC3I standard (r NIKK
T! 111! LBcTRONlcsJ, published by Nihon Keizai Shimbun, Inc. (see page 102-107, issue of IO, May 6, 1986) can be used. Furthermore, a post computer (5) and a hard disk drive a'! are connected to this bus (3) via an adapter (4). 6> etc. are connected.

In the above controller (2), the bus (3)
A protocol control circuit (21) is provided between the micro combinator (22) and the memory control (1) MA) circuit ( Data and control signals are exchanged between the bus 23) and the bus 3). Furthermore, state detection and operation control are performed between the micro combinator (22) and the DMA circuit (23), and the buffer memory (24) and bus (3) are connected through the MA circuit (23). Data is input and output between.

Furthermore, for this memory (24), this memory (2
A circuit (25) for generating an error correction code (ECC) for the data written in 4) is provided, and the error correction code generated by this circuit (25) is written to a predetermined portion of the memory (24). And this memory (24) and D AT fi
) 10 circuits (26) between the processing circuit (14) and
Human output of data is performed via (13). Further, control signals are exchanged between the microcomputer (22) and the system control circuit (18).

Therefore, in this device, the hard disk device (6)
The data written to the controller (3) is transferred to the controller (3) in response to a transfer request from the controller (3) during recording.
2) and written into the memory (24) via the MA circuit (23). Then, an error correction code is generated in a generation circuit (25) for the data written in this memory (24), and data including this error correction code is successively outputted via 10 circuits (26). T (1
) are input. Soshi-(' , :: 0) L)
In A T fl), the data manually entered into the 10 circuit (13) is regarded as the same as the data from the At) conversion circuit during audio recording, and the digital signal processing circuit (14) converts the data into the predetermined D A 1'. Head A converted to formant
.

It is recorded on the tape (12) at B.

During this recording, data is supplied from the memory (24) to the digital signal processing circuit (14) in the following manner.

In other words, in the DAT format, drum (11) 1
Two inclined tracks formed by rotation constitute one frame, and an original data amount of 5760 bytes can be recorded in one frame. So, for example, 12 frames are 1
As a unit, each of 117 frames has 5'
/ 60 bytes are recorded, and only 2176 bytes are recorded in the remaining frame, and the following is invalid data. As a result, the amount of data for one unit (12 frames) described above can be set to 65,536 bytes (64 bytes).

Therefore, when a byte is first written to this 64 in the above-mentioned memory (24), the generation circuit (25) generates the prefecture i1.
A correct code is generated. Here, as this error 1 correct code, for example, an error correction code for 2 frames is generated for the above-mentioned 12 frames of data using, for example, a Reed-Solomon code. This generated error 1 correct code is written into a predetermined part of the memory (24).

At the time of recording, the memory (24) is configured such that first, one frame's worth of error correction codes are output one after another, then 12 frames' worth of data signals are output one after another, and finally one frame's worth of error and one correct code is output one after another. reading is controlled.

As a result, the recording pattern on the tape (12), for example, as shown in FIG. ) followed by 1
A data signal period of two frames (partially omitted) is provided, and an ECC signal of one frame is further provided. During reproduction, a desired ECC frame interval is extracted using a timing signal such as a frame number in the data signal.

On the other hand, when re-recording this data signal after editing or other processing, the rotational phase servo of the drum (11) etc. is removed from the part before being re-recorded. As shown in FIG. 3, head B starts recording the ECC signal in the latter half of the ECC frame, and after recording 12 frames of data signals, head A only records the HCCffi number, and ends the 11th recording.

As a result, recording is performed as shown in FIG. Here, when re-recording, the error 8j correct code is reduced by one frame, but this is because these frames are treated as lost frames and error correction is performed during endogenous generation, so the Hatake 1 stopping ability is somewhat reduced. Since the data signals are preserved, no problems will occur in normal use.

Therefore, in this device, data signals between ECC frames can be arbitrarily re-recorded, and recorded data signals can be easily edited and replaced.

In the above-mentioned apparatus, if a frame error correction code is provided, for example, it is possible to correct errors up to frame 2 in the recorded signal. Therefore, when verifying errors in signals recorded using a so-called read-after-write head, errors up to the above-mentioned frame can be ignored; It can be simplified to

Also, when the number of error frames becomes larger than k,
The entire block between the above-mentioned ECC frames may be repeatedly recorded. In this case, since the block is divided into small blocks by the 11CC frame, this block can be easily repeatedly recorded.

In the case of re-recording, the above-mentioned value of k is set to -1.

In addition, in the case of re-recording, in order to prevent the risk of detecting the remaining ECC frames from the previous time, for example, a code indicating the number of times of re-recording is inserted into each frame, and frames other than those with the same number of times are You may choose to ignore it.

Furthermore, in the above-mentioned device, the data used to generate the error correction code is a data string that can be interleaved between each track, which improves the ability to correct errors caused by so-called horizontal scratches on the tape. can be done.

In addition, in the above-mentioned device, a sufficient number of ECC frames are formatted, and high-grade models generate error correction codes for all frames, while low-grade models only generate error correction codes for some of the frames. It is also possible to generate this and use the rest as meaningless data.

Thus, according to the device described above, L)AT can be used as a data recorder, in which case according to the configuration described above, the rotary head drum (11) is rotated, for example, at 2000 rpm, and the data is recorded at a rate of 192,000 rpm per second. This is done at an extremely high speed of bytes, and the amount of recording media consumed can be extremely reduced. Furthermore, in this case, the above-described configuration allows smooth re-recording, so that good data can be recorded using this.

〔Effect of the invention〕

According to this invention, the error correction code for one to several frames is recorded every time a predetermined frame of digital equalization code is recorded during recording, so the ability to stop errors is greatly improved. At the same time, by recording up to the frame of this error correction code when re-recording, re-recording can be performed smoothly without destroying necessary data, thereby forming a good data recorder using this DAT. Now I can do it.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an example of the present invention, and FIG. 2 is a diagram for explaining the same. (11 is D A i', +21 is the controller, (
3) is a lotus, (4) is an adapter, (5) is a host computer, (6) is a hard disk device, (11) is a rotating head drum, (12) is a tape, (14) is a digital signal processing circuit, (16) is a switch, (18) is a system control circuit, (22) is a microcomputer, (23) is a DMA, (24) is a memory, (
25) is an error analysis and correction code generation circuit, and A and B are recording and reproducing heads.

Claims (1)

[Claims] It has a rotating head, and one rotation of the rotating head produces two
At the same time as the inclined tracks of the book are formed, a device is provided which records and reproduces the two inclined tracks as one frame and encodes the digital signal so that it is completed within this one frame. Sometimes, an error correction code for one to several frames is generated for each predetermined frame of the digital signal, and a frame of this error correction code is recorded at the boundary of the recording for each predetermined frame. A data recorder characterized by: