JPH03137874A - Digital data recording/reproducing device - Google Patents

Abstract

PURPOSE:To prevent a recording data from missing and lacking even in the case of a burst error and to reproduce the data at the real time by recording the occurrence of an error into a burst error data recording area when the error takes place at the time of recording. CONSTITUTION:At the time of recording, after processing an addition of an error correction data, etc., to an input data Di, its recording is performed in turn on a tape 2. Subsequently, it is reproduced by a reproducing head 5, and the contents of a recording data, in which a recording error occurs, are stored in a memory 9. Then, when the data recording to a real time data recording area 2b is completed, a burst error (BE) data and its position data, which are stored in the memory 9, are read out by a processing part 7, and are recorded in the BE data recording area 2c. At the time of reproducing, when a BE is detected by the processing part 7 during reproducing data, the BE data stored in the memory 9 is outputted via a changeover switch 11 for responsing to a changeover signal SW to a line L9. By this method, the recording data is prevented from missing and lacking, and the data can be reproduced at the real time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital data recording/reproducing device suitably implemented in a DAT (digital audio tape recorder) or the like.

2. Description of the Related Art Digital data recording/reproducing apparatuses, such as DAT, which record digital data on a tape-shaped magnetic recording medium or reproduce digital data recorded on the tape, include an error correction code in the data at the time of recording. There are two methods: one that performs signal processing such as adding data and interleaving data, and corrects errors during reproduction, and the other that rewrites the data when an error is detected in the recorded data.

Problems to be Solved by the Invention However, in the former method, which performs signal processing such as adding an error correction code and interleaving data, and performs error correction based on the above data during playback, it is difficult to avoid errors such as bit errors and block errors in the data. , is suitable for so-called random errors, but is not suitable for so-called burst errors where errors occur continuously.

On the other hand, the latter method, which rewrites the data after detecting an error in the recorded data, is not suitable for devices that do not need to process data in real time, such as external storage devices for computers such as data recorders. However, it is not suitable for data that must be processed in real time.

Therefore, it has been a technical challenge to realize a digital data recording/reproducing device that can solve these problems, deal with burst errors, and perform data processing in real time.

The present invention has been made in view of the above-mentioned problems, and includes:
It is an object of the present invention to provide a digital data recording/reproducing device that can cope with burst errors and execute data processing in real time.

Means for Solving the Problems The present invention provides a digital data recording/reproducing device that records input digital data on a recording medium, reproduces and outputs the recorded data, and converts the input data into the data format of the recorded data. a processing means for converting the reproduced data into a data format of output data; an error detection means for detecting a data recording error; and a delay means for delaying the reproduced data by a predetermined time, and the processing means stores the stored contents of the storage means after the recording of the input data is completed. This is a digital data recording/reproducing device characterized by recording at a predetermined position in a recording medium.

Function: The digital data recording/reproducing apparatus according to the present invention includes an error detection means for detecting recording errors such as burst errors, and a memory for storing data at the time of error detection and a position on a recording medium where the data is to be recorded. When a recording error is detected during recording of input data, the processing means stores the data causing the error in the storage means together with the data indicating the position. When the recording of the input data is completed, the stored data is read from the storage means and recorded in another predetermined area of the recording medium.

When reproducing data, the data stored in another area of the recording medium is first read out and stored in the storage device 2, and then the data is sequentially read out from the recording medium and delayed by a predetermined time using the delay means. When the reproducing operation reaches the error position, the data stored in the storage means is read out without delay to compensate for a portion of the error and output.

Embodiment FIG. 1 is a block diagram showing the electrical configuration of a digital data recording/reproducing apparatus 1 according to an embodiment of the present invention.

Digital data recording/reproducing device (hereinafter referred to as the device) 1
is a recording medium, magnetic tape (hereinafter referred to as tape).
A recording magnetic head (hereinafter referred to as a recording head) 3, which is a recording means for writing and recording input data to the Qi 12, and a recording amplifier 4, a reproducing device for reading and reproducing the data recorded in the Qi 12. It is provided with a reproducing magnetic head (hereinafter referred to as a reproducing head) 5 and a reproducing amplifier 6, which are means.

Here, the tape 2 is moved by an arrow A by a drive unit (not shown).
The recording head 3 and the reproducing head 5 are arranged adjacent to each other so that the recorded contents can be read and reproduced by the downstream reproducing head 5 immediately after recording by the upstream recording head 3. .

As shown in FIG. 2, the tape 2 has, in its longitudinal direction, a tape starting end 2a of a certain length, a real-time data recording area EIi2b which is a regular data recording area, and a tape recording area EIi2b which is a regular data recording area when a burst error occurs. Burst error data recording area 2c for recording and saving input data of
and tape end section 2 (1).In order to distinguish between the data recorded on tape 2 and the data reproduced from tape 2, the reference numerals representing the data will include the former. The lowercase letter W is used for the latter, and the r is used for the latter.

The device 1 also includes a signal processing unit 7 formed mainly of a microprocessor (not shown), a memory unit that is a storage means for writing and storing data in a predetermined area, and a system that detects the presence or absence of burst errors in the reproduced signal Dr. Error detection circuit 8, data delay circuit 10, and output selector switch 1
1.

Next, referring to No. 1121, the operation of the device RA, 1 will be explained. During recording, input data Di applied to the input terminal 12 is input to the signal processing unit 7 via the line 11,
After signal processing is performed in accordance with a predetermined format for recording digital data, such as adding error correction data, the signal is applied from line 12 to recording head 3 via recording amplifier 4, and is then applied to tape 2. Recorded data Dw on top
tracks are formed sequentially.

The recorded data Dw recorded on the tape 2 is reproduced by the downstream reproducing head 5 immediately after recording, and the reproduced data Dr is input to the reproducing amplifier 6. The regenerative amplifier 6 receives the regenerated data D
After amplifying the signal r and performing processing such as waveform shaping, the signal is input to the signal processing section 7 and the error detection circuit 8 via the line 13.

The error detection circuit 8 detects the presence or absence of a burst error when recording the reproduction data output from the reproduction amplifier 6, and when a burst error is detected, for example, a high level r is detected.
The error detection signal Se of H, is input to the signal processing section 7 via the line 14.

FIG. 3 is a waveform diagram showing the operation during data recording of this embodiment. Reference numbers correspond to FIG.

FIGS. 3(1) to 3(3) show waveforms of various parts when the reproduced data 9'Dr is normal and no burst error has occurred.

In this case, as shown in FIG. 3(1), the recording data DwODw1, Dw2 . Dw
3. ... (generally referred to as Dw) are sequentially recorded in the main code area A1 at the center of the track on the tape 2.

In addition, on both sides of the main code area A1,
Subcode area A2. A3 is formed.

The recorded data Dw is immediately converted into reproduced data Dry, Dr1 . Dr2, Dr3. ...(
When they are collectively referred to as the reference mark Dr), they are sequentially reproduced. As is clear from these FIGS. 3(1) and 3(2), the recorded data DwO corresponds to the reproduced data DrO, the data Dwl corresponds to the data Drl, and so on.

In this way, when the reproduced data Dr is normal without any burst errors, the output of the error detection circuit 8 is as shown in FIG.
As shown in 3), the low level is constant at "L", and the error detection signal Se is not output.

On the other hand, as shown in FIG. 3(4) and FIG. 3(5), when a recording error occurs in the recording data Dw2 due to a burst error, the error detection circuit 8 As shown in FIG. 6, the error detection signal Se of high level rHJ is derived to the line 14.

The signal processing unit 7 receives the error detection signal Se as LINE! 4, the recorded data Dw2 in which a recording error occurred
and data indicating the position where the burst error has occurred, such as the track number, are input to the memory 9 via the line 15 as burst error data Drn, as shown in FIG. 3 (7), and stored at a predetermined address. write and memorize it. While repeating the above operations, recording and reproduction on the tape 2 proceed simultaneously.

In this way, when the recording of data to the real-time data recording area 2b shown in FIG. 2 is completed, the signal processing section 7 reads out the burst error data Dm and its position data stored in the memory 9. , this is recorded in the burst error data recording area 2c following the real-time data recording area 2b shown in FIG. As a result, the recorded data D w 2 at the time of error occurrence,
The position data is recorded and stored in a separate S area without infringing on the real-time data recording area 2b on the tape 2 where regular data is recorded.

Next, at the time of reproduction, the recorded data Dw2 that is first recorded in the burst error data recording area 2C of the tape 2 is
is reproduced (along with the if data) and stored in the memory 9 as burst error data Drm.

Next, the tape 2 is rewound, the recorded data Dw recorded in the real-time data recording area 2b is sequentially reproduced, and the reproduced data Dr is inputted to the signal processing section 7 and the error detection circuit 8 via the line 13.

Referring to FIG. 1, during playback, the output of the signal processing section 7 is as follows:
The data is input to the data delay circuit 10 via line 18.

The data delay circuit 10 outputs reproduced data Dr after being delayed for a certain period of time, which will be described later, and the delayed data Drb is delivered to one individual contact of the changeover switch 11. The other individual contact a of the changeover switch 11 has a memory 9
Burst error data Drm is read from the signal processor 7 and output from the signal processing unit 7 via the line 17.

The changeover switch 11 responds to a changeover signal Sw derived from the signal processing section 7 via a line 16 to switch the output line 1
It is connected by switching the contacts a or b, and during normal playback, the contacts b and c are electrically connected, and the playback data D
When a burst error is detected during period r, contacts a and c are made conductive by the switching signal Sw, and the burst error data Drm stored in the memory 9 is transferred to the output line l! 9 is output.

FIG. 4 is a waveform diagram showing the dynamics during playback of this embodiment. FIGS. 4(1) to 4(3) show waveforms when the reproduced data Dr is normal.

Referring also to FIG. 1, if there is no recording error in the reproduced data Dr, the reproduced data Dr shown in FIG. The delay circuit 10 delays the reproduced original signal by, for example, 2T, as shown in FIG. 4 (2).
As the delay data Drb shown in the changeover switch 11
from one output line to output terminal 13 through contacts b-c.
is output as reproduced output data DO.

During this time, no burst error is detected in the reproduced data Dr, and the level of the error detection signal Se shown in FIG. 4(3) remains at the low level rl=J.

On the other hand, waveforms when there is a recording error in the reproduced data Dr are shown below in FIG. 4 (4). Here, it is assumed that the reproduced data DrO is lost during recording, and the data of that portion is stored as burst error data DrrnO in the memory 9 as described above.

As shown in FIG. 4 (4), for example, the playback data D
The omission of rO is detected by the error detection circuit 8, and the error detection signal Se is immediately outputted at the timing shown in FIG. 4(6). When the error detection signal Se is input, the signal processing section 7 reads out the burst error data DrmO stored in the memory 8 and outputs it to the line 17, as shown in FIG. 4 (7). The switching signal Sw shown in FIG. 4 (8) is
to establish continuity between contacts a and c.

As a result, the delay data Dr shown in FIG. 4(5)
As shown in FIG. 4 (9), the burst error data D r rn O compensates for the reproduced data DrO portion, which is a portion of the recording error. In this way, even if a burst error occurs, the playback data Dr.
is played in real time without any gaps.

In the above embodiment, the data delay time of the data delay circuit 10 is set to 2T, but this is selected as an appropriate time determined by the processing time from reading data from the memory 8 of the signal processing section 7 to outputting it. Of course, it is a good thing.

Effects of the Invention As described above, even if a burst error occurs during recording, the digital data recording/reproducing apparatus according to the present invention stores the recorded data at the relevant position in the memory, and further stores the recorded data at the predetermined burst error on the tape. Since the data is recorded in the data recording area, the recorded data is not lost, and data can be reproduced in real time without being lost during reproduction.

In addition, the area on the tape where data read from memory is recorded is a burst error data recording area that is separate from the area that stores regular real-time data, so real-time data is not compromised and the data will be stored safely and securely.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of a digital data recording/reproducing apparatus 1 according to an embodiment of the present invention, FIG. 2 is a diagram showing the recording area of a tape 2 according to the embodiment, and FIG. FIG. 4 is a waveform diagram showing the operation during data recording in this example, and FIG. 4 is a waveform diagram showing the operation during data reproduction in this embodiment.

Claims (1)

[Scope of Claims] A digital data recording/reproducing device that records input digital data on a recording medium, reproduces and outputs the recorded data, and converts the input data into a data format of recorded data, and converts the input data into a data format of recorded data, a processing means for converting the data into a data format of output data; an error detection means for detecting a data recording error; and a delay means for delaying the reproduced data by a predetermined time, and the processing means stores the stored contents of the storage means at a predetermined position in the recording medium after the recording of the input data is completed. A digital data recording/reproducing device characterized by recording on.