JPH02240874A - Inspection device for recording or regenerating signal of digital audio tape recorder and its method - Google Patents

Abstract

PURPOSE: To improve accuracy by checking an error generating state using a retrieval head, reexecuting a recording or reproducing operation, and correcting errors. CONSTITUTION: The data, which is modulated by DSP 50 so that information is fitted to a recording form, is stored in a recording and reproducing buffer 30, amplified by a recording and reproducting amplifier 20, and then recorded on a tape through the head (b) of a channel 1 and a rotary transformer channel 1. A retrieval head (a) at 45 deg. behind, reads the data recorded by the head (b), storing it in a retrieval buffer 40 via a channel 2 through the amplifier 20. A comparator 60 compares data from the buffers 40, 30, outputting to a controller 70 a state comparison signal which is 0 if the data are the same and 1 if different. In the case of 0, the buffer 30 is controlled with the next data recorded and, in the case of 1, the buffer 30 is controlled with the error generating data recorded again; if no correction is made in spite of the repeated re- recording operation, it is determined as a system error. Thus, accuracy is improved at the time of recording.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an input/output data inspection device in a data storage device using digital audio tape.
In particular, a 4-head drum using a 2-channel rotary transformer is used to record and play data using an auxiliary head to check whether an error has occurred, and if an error occurs, the error is corrected and then re-recorded. This relates to signal inspection equipment/equipment.

Conventional techniques and problems Conventionally, when recording data on a digital audio tape (hereinafter referred to as DA), as an example, a digital signal display processor (hereinafter referred to as DS) is used as shown in FIG.
The signal generated from the drum P is stored in a buffer 60 and then input to the drum 10 through a playback amplifier 20 to be recorded on a tape.

Therefore, it is impossible to determine whether or not there is an error in the input data until after the entire amount of data desired to be recorded has been recorded on the tape and the tape is played back from the beginning.

For this reason, not only is there the problem of not being able to input data accurately, but also the error correction work is performed by replaying the data from the beginning after the recording process is complete and checking the error positions one by one. However, there was the inconvenience of complicating the work process.

Also, in the case of playback data, at the same time as playback, confirm whether or not an error has occurred and play it again! Since there was no way to obtain it, it had the disadvantage of low accuracy.

Means for Solving the Problems Accordingly, an object of the present invention is to construct a four-head drum with two auxiliary heads for error detection and reproduction using a two-channel rotary transformer, and to record 15 An object of the present invention is to provide a recording and reproducing inspection device that searches for and corrects the error in order to enable re-recording or reproduction.

Hereinafter, the present invention will be described with reference to the accompanying drawings! , explain to FIH.

FIG. 2 is a head arrangement diagram according to the present invention, in which head b of channel I CH+ and head d of channel 20H2 are attached at 180 degrees, and search head a of channel 1 and search head C of channel 2 are attached. For convenience 1
It is installed at an 80° angle.

Also, head b of channel 1 and search head a of channel 1 form an angle of 45°, and head d of channel 2 and search head C of channel 2 also form an angle of 45°, but at 90°. and when the drum rotates counterclockwise, channel 1
Search head a of channel 1 is positioned behind head b of channel 1.

FIG. 3 is an exemplary diagram showing how each head is connected to a rotary transformer. Head b of channel 1 and search head C of channel 2 are connected to rotary transformer channel 1, head d of channel 2 and channel 1.
A search head a is connected to channel 2 of the rotary transformer.

FIGS. 4(A) and 4(B) show channels 1 and 1, respectively, when the heads are connected as shown in FIG. This is the signal waveform transmitted to the rotary transformer of channel 2.

At this time, in the case of DAr, the tape winding angle is 90°.

FIG. 1 is a system block diagram of the present invention, which includes a 4-head drum 10 having a 4-head configuration as shown in FIG. 2 using a 2-channel D-tally transformer, and video and audio to be recorded. The data is amplified and the drum 10
output to the heads of channel 1 and channel 2 to record audio and video data on tape, or output to heads b and d of channel 1 and channel 2 and channel 1
and a recording/reproducing amplifier 20 for amplifying the video and fame data read out from the search heads a and C of channel 2, a DSP 50 for modulating and outputting the video and audio data to suit recording or reproduction, and the above. The recording video and audio data read out from the DSP 50 may be stored and output to the recording/playback amplifier 20 or the drum 10.
a recording/playback buffer 30 for storing playback video and audio data read out from channels 1 and 2 heads b and d and read out via the recording/playback amplifier 20 and outputting it to the DSP 50; Video and audio data to channel 1
and play again through channel 2 search head a, c (
A search buffer 40 that stores the data after amplifying it in the recording/reproducing amplifier 2o (hereinafter referred to as "search data")
And the recording/playback buffer mentioned above? -30 and search buffer 1
- a comparator 60 that compares the video and 8-voice data (recorded and reproduced data and search data) stored in the 40 and outputs a comparison signal in a predetermined state, and a data error occurs during recording and reproduction depending on the state of the comparison signal. The recording/reproducing buffer 30 and a controller 70 determine whether or not the recording/reproducing buffer 30 and the instrument section are rerecorded or reproduced again.

The present invention will be described in detail based on the configuration described above.

In the case of recording the first f1 data, explanation will be given by taking the channel 1 head b and the channel 1 search head a as an example.

The first step is to record the video or audio information you want to record on the DAr.
When the DSP 50 shown in the figure modulates and outputs the data to match the recording format, the processed video and 8-voice data are stored in the recording/playback buffer 30 and are amplified by a predetermined amount through 2 recording/playback 7 amplifiers 2o. After that, the recorded data is recorded on a tape through the rotary transformer channel 1 and head b of channel 1, which are connected as in FIGS. 1 and 2.

At this time, the search head a of channel 1 located 45 degrees behind reads the data recorded by the head b of channel 1, and this search data is transmitted through the rotary transformer to channel 2 for recording and reproduction. The signal is amplified to a predetermined value by the amplifier 20 and stored in the search buffer 40.

The stored search data is sent to the comparator 60 when output, and the comparator 60 compares the search data input to the search buffer 40 with the data input from the recording/playback buffer 30, and if they are the same, " A state comparison signal of 0° and “1′° when they are different is output to the controller 70.

The 1IIllll device 70 inputting the above comparison signal checks the state of the comparison signal and when it is 0', data recording is steady, so the above recording/reproduction buffer is continuously checked. -30, the next data to be recorded is recorded as described above, and if it is "1", it means that an error occurred during data recording, so the above recording/playback buffer is used. 30 to record the data in which the error occurred again. However, if an error occurs at this time, the above re-recording operation is repeated N times, and even after repeating up to N times, the error is corrected. When an error occurs, it is treated as a system error and processed.

On the other hand, head b of channel 1 and search head C of channel 2 are operated in the same manner as described above.

Also, when reading out and reproducing the video'IIIFTj audio signal recorded from the drum 10, the four heads operate in the same manner as during recording. That is, the reproduction data through channel 1 and channel heads b and d is stored in the recording and reproduction buffer 30 via the recording and reproduction amplifier 20, and the search data read through the search heads a and C of channel 1 and channel 2 is stored in the recording and reproduction buffer 30 through the recording and reproduction amplifier 20. Recording/playback amplifier 2
0 and then stored in the search buffer 40. Therefore, based on the comparison result of the comparator 60 which inputs data from the above two buffers 30 and 40, the Ijiil device 70 tiIImg the recording and reproducing buffer 30 and continuously performs DS.
The process of outputting playback data to P50 or turning a device (not shown) to rewind the tape to the error occurrence position and play it again can be performed up to N. At this time, if the error is not corrected even after repeated reproduction up to a set number of times, a system error process is performed. Here, the drum 10 has 20GOr, El
, -, one diameter is 30 mm, and the normal tape running speed is 8.15 tapes/sec, but each recording/playback head and search head are separated by 45 degrees. Assuming this, when the track recorded by head b of channel 1 exceeds the 45° angle at which search head a of channel 1 attempts to read it, the track is deviated by about 3.01 μm.

However, the gap width of the DAr currently in use is 20
．． In the worst case, the track width proposed by the standard is 13.5μ.
Since it is 59 .mu.-, the entire width of the head can be read even if the deviating width of 3.01 .mu.m is added.

Further, the problem of leakage of channel 1 and channel 2 is solved by assuming that the search heads of channel 1 and channel 2 have the same azimuthal angle.

Effects of the Invention As described above, accuracy during data reproduction and recording can be improved by checking the error occurrence status using the search head and correcting the error by re-performing the recording or reproduction operation. There are advantages that can be achieved.

[Brief explanation of drawings]

Figure 1 is a system block diagram of the present invention, Figure 2 is a head arrangement diagram according to the present invention, Figure 3 is a connection diagram of the 0-tally transformer of each head, and Figures 4 (A) and (B) are The input/output diagram of the head, FIG. 5, is a conventional system block diagram. 10...Drum, 20...Amplifier for recording and playback, 30
... Recording and playback bag? -14o...search bag? -150...Digital signal display processor 6
0...Comparator, 7o...Controller.

Claims (1)

[Scope of Claims] (1) A recording and reproduction data error inspection device for a digital audio tape recorder including two data recording and reproduction heads (b, d) connected to a two-channel rotary transformer and the recording and reproduction heads (b, d) connected to a two-channel rotary transformer; A four-head drum (10) consisting of two playback-only search heads (a, c) that determine whether an error has occurred in data recorded or played back by the playback heads (b, d), and audio and video. a digital signal display processor (50) that modulates data; and a digital signal display processor (50) that amplifies and outputs video and audio data for recording to the recording/reproducing head of the drum (10) depending on the recording or playback mode selection state; Playback head (
a recording/reproducing amplifier (20) that amplifies and outputs the video and audio data for reproduction read out from the search heads (a, c) and the search data read out from the search heads (a, c); A recording and reproducing buffer (30) that inputs and stores reproduced data from 20) and recording data from the above-mentioned DSP 50.
and a search buffer (40) that inputs and stores search data from the recording/playback amplifier (20), and compares the data output from the record/playback buffer (30) and the search buffer (40). a comparator (60) that outputs a comparison signal in a predetermined state; and a comparator (60) that outputs a comparison signal in a predetermined state;
30) so that when the recorded/reproduced data and search data are the same, the corresponding operation is performed continuously during the recording or reproducing operation, and when they are different, the corresponding operation is repeated a predetermined number of times. A device characterized by comprising a controller (70). 7 In a recording and playback data error checking method for a digital audio tape recorder equipped with a two-channel drum equipped with first and second heads (b, d) and first and second search heads (a, c), A first step of recording or reproducing the input/output data of channel 1 with the first head (b); After performing the first step, reproducing the input/output data of channel 1 with the first search head (a) and reproducing the input/output data of channel 1. a second step of outputting a search signal; and after performing the second step, the recording or reproducing signal of channel 1 is compared with the search signal of channel 1, and if they are the same, performing the next data recording or reproducing operation; a third step of repeatedly recording or reproducing the error occurrence data for a predetermined number of times at different times, and recording input/output data of channel 2 with a second head (d) after performing the third step; or a fourth step of reproducing, and a fifth step of reproducing the input/output data of channel 2 with the second search head (c) to output the search signal of channel 2 after performing the fourth step, and performing the fifth step. Afterwards, the recorded or reproduced signal of channel 2 is compared with the search signal of channel 2, and if they are the same, the next data is reproduced or output, and if they are different, the error data is repeated for a predetermined number of times. and a sixth step of recording or reproducing. (3) In the four-head drum (10), the channel 1 head (b) and the channel 2 search head (c) are connected to the rotary transformer channel 1, and the channel 2 head (d) and the channel 1 search head ( 2. Device according to claim 1, characterized in that a) is connected to a rotary transformer channel (2).