JPH01140402A - R-dat signal recording system - Google Patents

Abstract

PURPOSE:To surely record a signal on a tape by recording the signal to be recorded with an azimuth head on a track as it is by means of a sub-azimuth head when the prescribed signal is not recorded with a main azimuth head. CONSTITUTION:The sub-azimuth heads 13 and 14 are provided which detect the signal recorded on the track by tracing the main azimuth heads 11 and 12 on the track where the signal is recorded by the main azimuth heads 11 and 12. Further, when it is judged that the prescribed signal is not recorded on the track from the signal detected by the sub-azimuth heads 13 and 14, the signal to be recorded by the main azimuth heads 11 and 12 is recorded on the track by means of the sub-azimuth heads 13 and 14. Thus, when the main azimuth heads 11 and 12 are defective at the time of the recording, the signal can be recorded on the tape by the sub-azimuth heads 13 and 14, and the signal can be surely recorded on a tape 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an R-DAT signal recording method, and in particular, even if the main azimuth head becomes defective during recording,
R-D capable of recording with a sub-azimuth head
This relates to an AT signal recording method.

R-DAT is a rotary head.
) type D A T (Digital Audio T
ape recorder), and has superior performance in terms of SZN ratio 1 frequency characteristics, distortion rate, dubbing characteristics, random access, etc., compared to conventional analog tape radars.

[Conventional technology]

In recent years, research and development of DAT has progressed, and in particular, R-DAT, which can be applied to VTR technology, has already been put into practical use.

This R-DAT is, for example, approximately 6°23 with respect to the tape.
Digitize and time-compress data signals such as stereo music onto 13.6 μm wide tracks with
The data is compressed to about 1/2 or more) and recorded.

As per the R-DAT standard, on both sides of the part (PCM part) where data signals such as stereo music are recorded, ATF (Auto
atic Track Finding) signals and sub-codes (C3UB code) for displaying the elapsed time of the song, program number, etc., and furthermore, margins are provided on both sides of each track.

[Problem that the invention seeks to solve]

Conventionally, when recording signals on a magnetic tape in an R-DAT, it has sometimes become impossible to record signals temporarily or continuously due to head clogging, disconnection, or the like. When playing back such tapes, phenomena such as distortion, noise, or audio interruptions may occur in the played music signals, and furthermore, it may not be possible to play the music signals at all. Sometimes I couldn't.

To address this problem, conventional approaches have been to make the head less likely to clog by improving the shape of the head and the magnetic material and binder of the tape, and by installing a separate CTL servo to track the head during playback even if the head is defective during recording. Measures were taken to enable control. However, these measures are not fundamental, and even if the shape of the head and the magnetic material and binder of the tape are improved, there are limits.Also, even if a CTL servo is installed separately, there will be problems in terms of compatibility. there were.

The present invention addresses the problems of the conventional R-DAT signal recording method described above, and when a predetermined signal is not recorded on a track by the main azimuth head, it is recorded by the main azimuth head by the sub-azimuth head. The purpose of this method is to ensure that signals are recorded on the tape by recording the desired signals on the tracks.

[Means for solving problems]

According to the present invention, there is provided an R-DAT signal recording method in which a signal is recorded on a track of a tape by an azimuth head, and the track on which the signal is recorded is traced from behind the main azimuth head. A sub-azimuth head is provided for detecting a signal recorded on the track, and when it is determined from the signal detected by the sub-azimuth head that a predetermined signal is not recorded on the track, the sub-azimuth head detects a signal recorded on the track. There is provided an R-DAT signal recording method characterized in that a signal to be recorded by the main azimuth head is recorded on the track.

[For production]

According to the R-DAT signal recording method of the present invention having the above-described configuration, when a predetermined signal is not recorded on a track by the main azimuth head, the sub-azimuth head records the signal to be recorded by the main azimuth head. Record to track.

Thereby, even if the main azimuth head becomes defective during recording, signals can be recorded on the tape by the sub-azimuth head.

〔Example〕

Hereinafter, the R-DAT signal recording method according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an example of a head configuration for realizing the R-DAT signal recording method according to the present invention.

As shown in the figure (a), the rotating drum 1 has 18
The main azimuth heads 11 and 12 form an angle of 0'.
is provided. The tape 3 is configured to run at a wrapping angle of 90'' with respect to the rotating drum. In these two main azimuth heads 11 and 12, the azimuth angle of the main positive azimuth head 11 is the same as the tracing direction of the head. The azimuth angle of the main negative azimuth head 12 is set at a minus 20° angle with respect to the direction perpendicular to the tracing direction of the head. When the plus azimuth head 11 and the main minus azimuth head 12 reproduce signals recorded on adjacent tracks, the azimuth loss makes it difficult for them to influence each other.

In addition, the rotating drum 1 has a main positive azimuth direction 11.
A sub-positive azimuth head 13 and a sub-minus azimuth head 14 are provided at positions delayed by an angle of 90 degrees with respect to the main negative azimuth head 12, respectively. That is, the sub-azimuth head 13 (14) is connected to the main azimuth head IH1 as shown in FIG. 1(b).
2), 0.5 track in the head height direction (
It is provided below by a distance #d of approximately 6.8 μm). Then, when the main azimuth head IH 12) reaches the end position of the recording track, the sub azimuth head 13 (1
4) is positioned at the starting end position of the track. Here, reference number 2 indicates a fixed drum, on which the rotating drum 1 will rotate.

The sub-azimuth head 13 (14) is the main azimuth head 1
The main azimuth head 11
(12) finishes tracing a predetermined track, the sub-azimuth head 13 (14) immediately starts tracing the predetermined track. The sub azimuth head 13 (14) is the main azimuth head 11.
The signal recorded in step (12) is detected to determine whether a defect has occurred in the main azimuth head IH12). That is, the output of the sub-azimuth head 13 (14) that detects the signal recorded by the main azimuth head IH 12) is supplied to the defect detection circuit 5 via the switch 61, and in the defect detection circuit 5 is sent to the main azimuth head IH 12). It is determined whether a defect has occurred. When the defect detection circuit 5 determines that a defect has occurred in the main azimuth head 11 (12), the switch 62 is controlled to remove the main azimuth head IH1.
2) to the sub azimuth head 13 (1).
4) and sends the signal to the sub azimuth head 13 (14).
). Here, the switch 61 is for selecting one of the sub-azimuth fields 13 or 14 for tracing the tape 3.

FIG. 2 is a diagram showing the recorded contents of a tape for explaining the R-DAT signal recording method of the present invention. As shown in the figure, the plus and minus azimuth heads are connected to tape 3.
13 having an angle of approximately 6″23° with respect to the direction of movement of
．． Data signals such as stereo music are alternately digitized and time-compressed and recorded on tracks with a width of 6 μm. Here, according to the R-DAT standard, each track (for example, plus azimuth track 31) has PCM, which is a data signal such as stereo music.
A portion 314 is recorded in the center, and ATF portions 313 for tracking control are provided on both sides of the PCM portion 314.
, 315, SUB code portions 312, 316 and margin portions 311, 317 that display the elapsed time of the song, index number, etc. are arranged symmetrically.

For example, when a signal is recorded on the plus azimuth track 31 by the main plus azimuth head 11, the signal recorded on the plus azimuth track 31 is immediately detected by the sub plus azimuth head 13 tracing the plus azimuth track 31. to be (regenerated). At this time, if no signal is recorded on the positive azimuth track 31 due to clogging of the main positive azimuth head 11, etc.
It is possible to determine whether the main positive azimuth head 11 is defective from the signal detected at the secondary positive azimuth track 31 traced on the positive azimuth track 31.

Specifically, for example, the signal of the margin 311 provided at the starting end portion of the positive azimuth track 31 (4,7M1l
z signal) is detected by the sub-plus azimuth head 13, and when the signal level becomes below the level, it is determined that the main plus azimuth head 11 is defective, and the sub-plus azimuth head The azimuth head 13 records on the plus azimuth track 31.

FIG. 3 is a circuit diagram showing an embodiment of the R-DAT signal recording method of the present invention, and FIG. 4 is a waveform diagram showing signals at various parts in the circuit of FIG. As shown in FIG. 3, during recording, the main positive azimuth head recording signal s2 is supplied to the main positive azimuth head 11 via the recording amplifier 41, and the main negative azimuth head 12 is supplied with the recording amplifier 42. A main negative azimuth head recording signal S is supplied through the main negative azimuth head recording signal S. These main azimuth head recording signals S2 and S are supplied to the main azimuth heads 11 and 12 only when the respective main azimuth heads 11 and 12 trace on the tape 3. Here, it goes without saying that the recording amplifiers 41 and 42 are in an on state during recording.

Signals recorded on predetermined tracks of the tape by the above-mentioned main azimuth heads 11 and 12 are detected by sub-azimuth heads 13 and 14. Furthermore, the signal detected by the sub-positive azimuth head 13 is transmitted to the reproduction head amplifier 45.
The signal detected by the sub-minus azimuth head 14 is amplified by the reproduction head amplifier 46 and supplied to the other contact of the switch 61. The switch 61 alternately connects the sub azimuth heads 13 and 14 in accordance with the sub azimuth head switching control signal S1, and supplies the reproduction envelope signal S4 of the sub azimuth head 13 or 14 to the band pass filter 51. Here, the bandpass filter 5I is designed to pass only the recording frequency 4.7MI (z) of the margin provided at both ends of each tiger/vine. The detected reproduced envelope signal S4 is, as shown in FIG.
, , SUB code part signal S, 2°ATF part signal S43
and a PCM signal section S44.

The output signal of the bandpass filter 51 is supplied to an envelope detection circuit 52, and the output signal of the envelope detection circuit 52 is supplied to a comparator 53.

Here, the comparator 53 is connected to the sub-azimuth head 13°1.
It compares whether the signal level of the margin part of each track detected in step 4 is equal to or higher than a certain value, and when the signal level of the detected margin part is equal to or higher than a certain value, a high level signal is output. . The output signal of the comparator 53 is supplied to a digital signal processing circuit 54,
In the digital signal processing circuit 54, 4.7M1l
Based on the Z-check timing signal St, it is determined whether the signal level of the first margin portion of each track is greater than or equal to a certain value.

Hereinafter, the case where the main positive azimuth head 11 becomes defective will be described in detail with reference to FIGS. 2 to 4. Among the output signals of the comparator 53, the positive azimuth track 3
When the signal level of the first margin section 311 of 1 is not higher than the value, that is, the digital signal processing circuit 54
, the comparator 5 corresponding to the margin section 311
When the output signal No. 3 is not at a high level, it is determined that the main positive azimuth head 11 is defective. Then, the recording amplifier control signal S for the sub-plus azimuth head
6 is set to a high level to turn on the recording amplifier 43 connected to the sub-plus azimuth head 13, and the sub-plus azimuth head recording signal S7 is supplied to the recording amplifier 43. As a result, the sub-plus azimuth head 13, for example, starts the first sUB code 312 with respect to the track 31.
The signal will be recorded from. Here, the sub-plus azimuth head recording signal S7 recorded by the sub-plus azimuth head 13 is the same as the main plus azimuth head recording signal S2 to be recorded by the main plus azimuth head 11, and the sub-plus azimuth head recording signal S7 is Head I3
It goes without saying that the track on which the signal is recorded is the same as the track on which the signal is to be recorded on the main positive azimuth head 11 (for example, the positive azimuth track 31).

In the embodiment described above, the position of the sub-azimuth head 13 (14) provided on the rotating drum 1 is at a position delayed by an angle of 90' with respect to the main azimuth head IH12) described above, and at the same time in the height direction of the head. The main azimuth head 11 (12) traces the track on which the signal was recorded immediately after, and detects the signal recorded on that track. It can be provided at any position on the rotating drum 1 as long as it is possible.

〔Effect of the invention〕

As described above in detail, in the R-DAT signal recording method according to the present invention, when a predetermined signal is not recorded on a track by the main azimuth head, the sub-azimuth head is used to record a signal to be recorded by the main azimuth head. By recording the signal on the track, it is possible to reliably record the signal on the tape.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the head configuration for realizing the R-DAT signal recording method according to the present invention, and FIG.
FIG. 3 is a circuit diagram showing an embodiment of the R-DAT signal recording method of the present invention, and FIG. 4 is the circuit shown in FIG. 3. FIG. (Explanation of symbols) ■...Rotating drum, 2...Fixed drum, 3...Tape, 11...Main positive azimuth head, 12...Main negative azimuth head, 13...Sub positive azimuth Head, 14... Sub-minus azimuth head, 41, 42.
43.44... Recording amplifier, 45.46... Playback head amplifier, 51... Band pass filter, 52... Envelope detection circuit, 53... Comparator, 54... Digital signal processing circuit.

Claims (1)

[Claims] 1. R-DAT signal recording method in which a signal is recorded on a tape track by an azimuth head, and the track on which the signal is recorded by the main azimuth head is traced from behind the main azimuth head. and a sub-azimuth head that detects a signal recorded on the track, and when it is determined from the signal detected by the sub-azimuth head that a predetermined signal is not recorded on the track, the sub-azimuth head detects the signal recorded on the track. An R-DAT signal recording method characterized in that a head records a signal to be recorded by the main azimuth head on the track. 2. The main azimuth head is composed of two positive and negative azimuth heads installed on a rotating drum at an angle of 180°, and the sub azimuth head is
2. The system according to claim 1, wherein two positive and negative heads are provided on the rotating drum in correspondence with the two azimuth heads. 3. The sub-azimuth head is provided at a predetermined angle with respect to the rotation direction of the main azimuth head and spaced apart in the height direction by a distance corresponding to the angle,
2. The method according to claim 1, wherein when the main azimuth head comes to the end position of a recording track, the sub-azimuth head comes to the start end position of the track. 4. The sub-azimuth head detects the signal level of the margin recorded on the tape, determines whether the main azimuth head is defective, and causes the sub-azimuth head to record from the signal of the next sub-code of the margin. The system according to claim 1, wherein: