JPH03250880A - Video tape recorder - Google Patents

Abstract

PURPOSE:To surely record a recording signal by overwriting a same recording signal onto a same recording area when the recording signal is recorded on the recording tracks formed sequentially with an azimuth angle on a driven recording medium. CONSTITUTION:A recording signal SREC is recorded on a recording track formed sequentially with an azimuth angle on a recording medium 1 driven in a prescribed direction. First recording heads 12A-12D record the recording signal SREC on a prescribed recording track on the recording medium 1 as a draft and 2nd recording heads 4A-4D overwrite the recording signal SREC on a prescribed recording track. Since a same recording signal is overwritten onto a same recording area, the recording signal is surely recorded.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A: Industrial field of application B: Overview of the invention C: Prior art (Figs. 7 to 11) D: Problems to be solved by the invention E: Means for solving the problems (Figs. 1 and 5) F action (Fig. 1, Fig. 2, Fig. 5, and Fig. 6) G embodiment (G1) First embodiment (Fig. 1 to Fig. 4) (G2) Second embodiment (Fig. 3 to Fig. 6) Figure 6) (G3) Other Embodiments H Effects of the Invention A Industrial Field of Application The present invention relates to a video tape recorder, and particularly to a video tape recorder (VTR) that records digital video signals and digital audio signals on magnetic tape. It is suitable for application to.

B. Summary of the Invention The present invention enables recording signals to be reliably recorded in a video tape recorder by overlappingly recording the same recording signals in the same recording area.

C. Prior Art Conventionally, in a video tape recorder (digital VTR) for recording and reproducing digital video signals, for example, a seventh
As shown in the figure, a recording signal 5RKC consisting of a digital video signal and a digital audio signal sent from the recording circuit 3 via the recording head 4A is sequentially recorded on the magnetic tape 1 running in the direction indicated by arrow a, and (By immediately reproducing the reproduction signal S read out through the reproduction head 5A in the reproduction circuit 6, it is possible to monitor whether the digital signal is being recorded correctly.

Furthermore, it has been proposed that during reproduction, the reproduced signal is temporarily stored, the recorded signal on the magnetic tape is erased, and the recorded reproduced signal is rewritten (in particular). Publication No. 56-156975).

Here, on the magnetic tape 1, as shown in FIG. 8, tracks TRI are sequentially arranged at a track pitch TP.
, TR2, ......, six tracks TR
The digital video signal and digital audio signal for one field are divided into six, with I to TR6 as one set, and are allocated to each track TRl to TR6 and recorded.

Each of the tracks TRI to TR6 is divided into an area ARV for recording digital video signals (this is called a video area) and an area ARA for recording digital audio signals (this is called an audio area).

As shown in FIG. 9, the video area ARV includes, for example, recording areas (this is called a sync block) SBV 1 to 5.
It is subdivided into BVk, and each sync block records a sync pattern, ID pattern, data block, and error control data.

Further, the audio area ARA is divided into, for example, four channel areas ARA1 to ARA4, and each channel area ARAI-A, R
A4 has n sync blocks 5BAt 1 to 5BAtn (t=1.2.3
．． 4), and the data of the digital audio signal of four channels is allocated to the sync block of each channel area and recorded.

In a digital VTR configured to record and reproduce digital video signals and digital audio signals on the magnetic tape 1 having such a format, I!
A rotating drum 7 having the configuration shown in FIG. 11 is used.

That is, the rotating drum 7 has the magnetic tape 1 wrapped around the circumferential side 7A by guide posts 8A and 8B.
The magnetic tape 1 runs in the direction indicated by the arrow a, and the rotating drum 7 rotates in the direction already indicated by the arrow.

This rotating drum 7 has four recording/reproducing systems, and a total of four recording/reproducing systems similar to the first recording/reproducing system consisting of the recording head 4A and the reproducing head 5A described above with reference to FIG. 7 are provided. .

That is, on the circumferential side 7A of the rotating drum 7, there is a track TRI.
A recording head 4A is provided for scanning (FIG. 8), and the recording head 4A is located at a position apart from the recording head 4A by an angular interval of 90 degrees in the counter-rotation direction of the rotary drum 7.
A reproducing head 5 that reproduces and scans the track TR1 following the
A is arranged to constitute a first recording/reproducing system (FIG. 7).

Further, a recording head 4B and a reproducing head 5B are arranged as a second recording/reproducing system, which sequentially scan the track TR2 with a deviation from the recording head 4A and the reproducing head 5A by a track pitch TP, respectively.

Furthermore, a recording head 4C and a reproducing head 5C are arranged as a third recording/reproducing system at positions separated by an angular interval of 180 degrees from the recording head 4A and reproducing head 5A, respectively, and are configured to sequentially scan the track TR3. At the same time, the track TR4 is shifted by the track pitch TP with respect to the recording head 4C and the reproducing head 5C.
A recording head 4D and a reproducing head 5D are arranged as a fourth recording/reproducing system.

In this way, four systems of recording and reproducing systems are formed in the rotating drum 7, and while the rotating drum 7 makes half a revolution, the recording head 4
After tracks TR1 and TR2 are scanned for recording by A and 4B, recording heads 4C and 4D are moved during the subsequent half rotation.
Tracks TR3 and TR4 are scanned for recording, and during further half-rotation, tracks TR5 and TR6 are scanned by recording heads 4A and 4B.

Therefore, every time the rotating drum 7 rotates 1.5 times, one field's worth of digital video signals and digital audio signals are sequentially recorded on the tracks TRI to TR6.

On the other hand, the reproducing heads 5A and 5B are
The tracks TRI and TR2 scanned by the recording heads 4A and 4B are scanned by the recording heads 4A and 4B, and the recording signals recorded by the recording heads 4A and 4B are immediately reproduced and monitored. 5C and 5D are tracks TR scanned by recording heads 4C and 4D.
3 and TR4 are scanned following the recording heads 4C and 4D, and the recording signals recorded by the recording heads 4C and 4D are immediately reproduced and monitored.

In this way, digital video signals and digital audio signals are sequentially recorded on the tracks TRl to TR6 of the magnetic tape 1 by the recording heads 4A to 4D, and the digital video signals and digital audio signals are correctly recorded by the subsequent playback heads 5A to 5D. It is possible to detect whether or not the

Problems to be Solved by the Invention By the way, in a digital VTR having such a configuration, the magnetic tape 1 is scanned by the recording heads 4A to 4D in sliding contact with each other.
Foreign matter such as dust gets caught between the recording heads 4D, causing a so-called dropout in which recorded data is partially lost, or foreign matter such as dust gets caught in the head gap of the recording heads 4A to 4D, causing the recorded data to become continuous. There is a problem in that so-called clogs that are missing occur and the reproduced image and reproduced sound deteriorate.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a video tape recorder that can prevent the loss of recorded data and avoid deterioration of reproduced images and reproduced sounds.

Means for Solving E-H Fish In order to solve this problem, in the first invention, recording signals S□ are recorded on recording tracks sequentially formed diagonally on a recording medium 1 running in a predetermined direction. In the video tape recorder 10, the first recording heads 12A, 12
B, recording signal S□ by 12C112D. After draft recording is performed on a predetermined recording track on the recording medium 1, the recording signal SIIEc is superimposed and recorded on the predetermined recording track by the second recording heads 4A, 4B, and 4C14D.

Further, in the second invention, the first recording head 22A,
22B and 22C122D are recording and reproducing heads, and in the overwriting recording mode, the second recording head 4A,
4B, 4C14D are controlled to move to the leading side, and the recording signal Sl! is applied to the recording track on which the second recording head 4A, 4B, 4C14D records and scans. c in advance, and in other recording modes, the movement of the second recording heads 4A, 4B, 4C14D is controlled to the trailing side, and the second recording heads 4A, 4B, 4C
The recording signal S tic recorded by 14D is reproduced on a monitor.

F action By overlappingly recording the same recording signal SREc in the same recording area by the first recording heads 12A, 12B, 12C 112D and the second recording heads 4A, 4B, 4C, 4D, the first recording head 12A, 12B, 12C,
Even if a situation occurs in which the recording signal SIIEc such as a clog cannot be recorded on either the recording head 12D or the second recording head 4A, 4B, 4C, 4D, the data is recorded by the other recording head. The probability of occurrence of recording errors can be significantly reduced.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

(G1) First Embodiment In FIG. 1, in which parts corresponding to those in FIG. A recording signal S□ consisting of a digital video signal and a digital audio signal is passed through the draft recording head 12A and the recording head 4A. It is designed to record.

That is, the recording circuit 3 sends the recording signal syutc to the draft recording head 12A to draft the recording signal S□ on the track TRI of the magnetic stay 11, and also writes the recording signal S□. is sent to the delay circuit 14.

The delay circuit 14 delays the recording signal S□ for a predetermined period of time depending on the running speed of the magnetic tape 1 and the interval between the draft recording head 12A and the recording head 4A.
By sending out the recording signal S□, the recording head 4A uses the recording head 12A for drafting. The same recording signal S□ is overwritten on the track TR1 at the timing when the track TR1 on which the draft has been written arrives.

In this way, the recording signal S□. In this embodiment, as a method for overwriting the
Use.

That is, the rotating drum 15 has the magnetic tape 1 on the circumferential side 15A.
is wound helically by guide posts 8A and 8B, so that the magnetic tape 1 runs in the direction indicated by arrow a, and the rotary drum 15 rotates in the direction already indicated by arrow a.

This rotating drum 15 has four recording systems, and a total of four recording systems similar to the first recording system 10A consisting of the draft recording head 12A and the recording head 4A described above with reference to FIG. 1 are provided. There is.

That is, a track T is provided on the circumferential side 15A of the rotating drum 15.
A recording head 4A scans the RI (FIG. 8), and a track TRI is placed ahead of the recording head 4A at a position separated from the recording head 4A by a predetermined angular interval in the rotational direction of the rotary drum 15. A draft recording head 12A for recording and scanning is arranged, and a first recording system 10A (FIG. 1) is configured.

Further, a draft recording head 12B and a recording head 4B are arranged as a second recording system, which sequentially scan the track TR2 with a deviation from the draft recording head 12A and the recording head 4A by a track pitch TP, respectively.

Additionally, a draft recording head 12A and a recording head 4A
A draft recording head 12C and a recording head 4C are arranged as a third recording system at positions separated by an angular interval of 180 degrees from each other, and are configured to sequentially scan the track TR3, and to sequentially scan the track TR3. A draft recording head 12D and a recording head 4D are arranged as a fourth recording system, respectively, for sequentially scanning the track TR4 with a deviation from the recording head 12C and the recording head 4C by a track pitch TP.

In this way, a four-system recording system is formed in the rotating drum 15, and the recording signal SIEc is superimposed on each track TRI, TR2, . . . by the draft recording heads 12A to 12D and the recording heads 4A to 4D. It is written.

On the other hand, recording heads 4A, 4B, and 4C.

The reproducing heads 5A, 5B, and 5C15 are inserted in the counter-rotational direction of the rotary drum 15 from 4D by an angular interval of 90 degrees, respectively.
D is arranged so that the recording signals recorded by the recording heads 4A and 4B are monitored and reproduced by the reproduction heads 5A and 5B, and the recording signals recorded by the recording heads 4C and 4D are monitored and reproduced by the reproduction heads 5C and 5D. is being done.

In the above configuration, for example, when the recording head 4A is scanning the track TRI as shown in FIG. 3, even if a foreign object such as dust is caught in the head gap and the recording signal 50c cannot be recorded. , a recording signal S□ is previously applied to this area by the draft recording head 12A. As a result, on the track TRI, recorded data is formed almost continuously in the area 17A recorded by the draft recording head 12A and the area 17B recorded by the recording head 4A.

In this case, as shown in FIG. 4, when the recording head 4A is scanning, for example, the middle of the sync block 5BVt, a clog occurs and the recording signal S□. When the state M becomes such that recording cannot be performed, a boundary portion 19 between the area 17B recorded by the recording head 4A and the recording area 17A recorded by the draft recording head 12A is formed in the middle of the sync block 5BVt.

At this time, sink block SBV (t+1), SBV
At (t+2), . . ., the recording signal S□ is generated by the draft recording head 12A. are recorded correctly and the sync block 5BV (t-1), SBV
D-2), . . ., the recording signal S□ is generated by the recording head 4A. is recorded correctly.

Therefore, the recording head 4A receives the recording signal S by a clog or the like.
□. Even if it becomes impossible to record, the only area in which the recorded data becomes discontinuous and is not recorded correctly is in one sync block 5BVt, so dropout compensation is performed for only the recorded data in the sync block 5BVt during playback. By correcting the error using an error correction means such as the above, it is possible to prevent the reproduced video from deteriorating within a practically sufficient range.

Therefore, even if the recording heads 48 to 4D are unable to record due to clogs or the like, the draft recording heads 12A to 4D
12D is the correct recording signal S□. In each track TR1, TR2, .
It is possible to prevent continuous recording data from being missing, which would degrade reproduced images.

In addition, in contrast to this, recording heads 12A to 12D for drafting
Even when the recording signal SIc is not correctly drafted due to clogs or the like, the recording heads 4A to 4D output the recording signal S□. If the state is such that the recording head 4A to 4D can correctly record the recording signal S□, the recording signal S□ is correctly recorded by the recording heads 4A to 4D.

Therefore, the recording signal S1. It is possible to prevent deterioration of the reproduced video obtained by reproducing the recorded data in which the data is recorded.

Incidentally, the probability P1 that a state that cannot be recorded, such as a clog, will occur in one recording head is expressed by the following formula, Pi-2-''...
As expressed in (1), if the same recording signal is recorded overlappingly in the same area by the draft recording head and the recording head, there is a situation where it is impossible to record on both the draft recording head and the recording head. The probability of occurrence P2 is as follows, P2-2-"x2-'=2-th...
By achieving 2), it is possible to significantly reduce the probability that a transcript error will occur due to clogs or the like.

According to the above configuration, the draft recording heads 12A to 1
By overwriting the same recording signal S□0 by the recording heads 4A to 4D in the area where the recording signal S□ was drafted by the 2D, the recording head 4A to 4D or the draft recording head 12A to 12D Even if clogs or the like occur, recording errors that degrade reproduced images can be avoided.

(G2) Second Embodiment In FIG. 5, parts corresponding to those in FIG. 1 are denoted by the same reference numerals.
A is configured such that the recording head 4A and the recording/reproducing head 22A scan the magnetic tape 1 running in the direction shown by arrow a.

The recording head 4A is generally configured with a wide head gap, and the recording signal S□. When recording on the magnetic tape 1, the magnetic tape 1 is magnetized as deeply as possible in the thickness direction.

On the other hand, the recording/reproducing head 22 narrows the head gap to reproduce high frequency components by reproducing the magnetic flux in the shallowest possible part of the magnetic tape 1 when reading the recording signal recorded on the magnetic tape 1. It is designed so that it can be played up to.

Therefore, the recording signal S□. In the normal recording mode in which the recorded data is immediately monitored and reproduced, the recording/reproducing head 22A scans the magnetic tape 1 at the scanning position B, and the recording head 4A continues the recording scanned track ( The recording/reproduction head 22A performs reproduction scanning to monitor whether the recording signal smtc is being recorded correctly.

On the other hand, the same recording signal S□. In the overwrite recording mode in which the recording and reproducing heads 22A are superimposed and recorded on the same track, the recording/reproducing head 22A is moved to the scanning position F to scan the magnetic tape 1, and the recording/reproducing head 22A follows the track scanned by the recording/reproducing head 22A. The recording head 4A is designed to overwrite the same recording signal 5Rte.

That is, in the normal recording mode, the switching circuit 23 is switched to the switching input terminal 23A side, and the switching circuit 23 is switched to the switching input terminal 23A side.
4.25 and 26 are terminals 24A, 25A and 2 respectively
By switching to the 6A side, the recording signal S0C consisting of a digital video signal and a digital audio signal sent out from the recording circuit 3 is sent to the recording head 4A via the rotary transformer 28 and the switching circuit 23, whereby the magnetic tape is Recording signal S□ on the recording surface of 1,
The record data is recorded based on.

At this time, the recording/reproducing head 22 reads the recorded data recorded by the recording head 4A while immediately reproducing and scanning the track recorded by the recording head 4A at the scanning position B, and transmits the reproduction signal S□ via the switching circuit 26. The signal is sent to the reproducing amplifier circuit 29 and amplified to a predetermined signal level, and then sent to the reproducing circuit 6 via the switching circuit 25, rotary transformer 31, and switching circuit 24 for reproduction, thereby being recorded by the recording head 4A. recorded signal S
It is designed to monitor whether mIC is being recorded correctly.

On the other hand, in the overwrite recording mode, the switching circuit 23 is switched to the switching input terminal 23B side, and the switching circuits 24, 25 and 26 are switched to the terminals 24B and 25, respectively.
By switching to the B and 26B sides, the recording signal SOC sent from the recording circuit 3 is transferred to the switching circuit 2 via the switching circuit 24, the rotary transformer 31, and the switching circuit 25.
6 and the delay circuit 33.

At this time, the recording/reproducing head 22A is controlled to move to the scanning position F, thereby writing the recording signal S0° input via the switching circuit 26 onto the magnetic tape 1, and the recording head 4A is moved to the delay circuit 33 and the switching circuit 26. A recording signal S■ is input via the circuit 23. is overwritten on magnetic tape 1.

At this time, the delay time in the delay circuit 33 is
and the interval between the scanning position F of the recording/reproducing head 22A and the scanning position C of the recording head 4A.
At the timing when the track TRI on which the recording signal 5lllIC is drafted by A arrives at the scanning position C by the recording head 4A, the recording head 4 is applied to the track TRI.
The same recording signal S, I! . are overwritten.

Therefore, in the track TRI of the magnetic tape 1, the same recording signal s0° is superimposed on the same recording position by the recording/reproducing head 22A and the recording head 4A.

As a method for overwriting the same recording signal S-0 on the magnetic tape 1 by controlling the movement of the recording/reproducing head 22A in this manner, in this embodiment, a rotating drum having the configuration shown in FIG. 6 is used.

That is, the magnetic tape 1 running in the direction shown by arrow a is wound around a rotating drum 35 by guide bosses 8A and 8B, and the rotating drum 35 is configured to rotate in the direction already shown by the arrow.

This rotary drum 35 is provided with a total of four recording/reproducing systems similar to the recording/reproducing system 2OA described above with reference to FIG.

That is, a track T is provided on the circumferential side 35A of the rotating drum 35.
A recording head 4A that scans the RI (FIG. 8) is provided, and scans the track TRI at a position separated by an angular interval of 90 degrees in the counter-rotation direction of the rotating drum 35 with respect to the recording head 4A. A recording/reproducing head 22A is arranged, and a first recording/reproducing thread 20A (FIG. 5) is configured.

Also, the track TR2 is shifted by the track pitch TP with respect to the recording head 4A and the recording/reproducing head 22A.
A recording head 4B and a recording/reproducing head 22B for scanning are arranged as a second recording/reproducing system.

Furthermore, a recording head 4C and a recording/reproducing head 22 are provided as a third recording/reproducing system at positions separated by an angular interval of 180 degrees from the recording head 4A and the recording/reproducing head 22A, respectively.
A recording head 4D and a recording/reproducing head 22D are arranged to scan the track TR3, and a recording head 4D and a recording/reproducing head 22D are arranged to scan the track TR3 with a deviation of track pitch TP from the recording head 4C and the recording/reproducing head 22C, respectively. It is arranged as a fourth recording/reproducing system.

Here, the recording/reproducing heads 22A, 22B and 22C122
D serves as a head drive mechanism for dynamic tracking operation, with one end fixed to bimorph plates 37 and 38 (formed by stacking piezoelectric ceramic plates) fixed to a rotating drum 35, By controlling the applied voltages to the bimorph plates 37 and 38, it is possible to control the movement of the recording/reproducing rads 22A, 22B, and 22C122D in a direction parallel to the rotation axis of the rotary drum 35.

Therefore, in the normal recording mode, the recording heads 4A to
The tracks scanned by the 4D are recorded on the playback heads 22A to 22.
By controlling the movement of the recording and reproducing heads 22A to 22D to positions where they can be scanned following each other, the recording and reproducing heads 22A to 22D scan the magnetic tape 1 at the scanning positions shown in FIG. There is.

Therefore, in the normal recording mode, the recording heads 4A and 4B scan the tracks TR1 and TR2 in advance.
The recording/reproducing heads 22A and 22B follow and perform reproducing scanning, and the recording/reproducing head 22 tracks TR3 and TR4, which were previously recorded and scanned by the recording heads 4C and 4D.
C and 22D follow and reproduce and scan, so that the recording/reproducing heads 22A and 22B monitor and reproduce the recording data recorded by the recording heads 4A and 4B, and the recording data recorded by the recording heads 4C and 4D are recorded. Monitor reproduction can be performed using the reproduction heads 22C and 22D.

On the other hand, in the overwrite recording mode, the voltages applied to the bimorph plates 37 and 38 are controlled to control the movement of the recording/reproducing heads 22A to 22D by a predetermined amount in a direction parallel to the rotation axis of the rotary drum 35. , the recording/reproducing head 22 determines the position scanned by the recording heads 4A to 4D in advance.
The rads 22A to 22D are controlled to move to positions where they can scan in advance, respectively, so that the rads 22A to 22D scan the magnetic tape 1 for recording and reproduction at the scanning position F shown in FIG. Therefore, in the overwrite recording mode, the recording pads 4A and 4
The recording and reproducing heads 22A and 22B respectively perform draft scanning on the tracks TRI and TR2, which are recorded and scanned by the recording head B, and the recording and reproducing heads 22C and 22D respectively perform draft scanning on the tracks TR3 and TR4, which are recorded and scanned by the recording heads 4C and 4D. By performing draft scanning in advance, the recording heads 4A to 4D scan tracks TRI and T, respectively.
Before recording the recording signal S*XC on R2, . . . , the recording signal S*tc can be drafted on the corresponding tracks TRI, TR2, .

In this way, by controlling the movement of the recording and reproducing heads 22A to 22D to the scanning position B or F and operating them as a monitor reproducing head or a draft recording head, it is possible to switch between the normal recording mode and the overwrite recording mode. There is.

In the above configuration, in the overwriting mode, the recording and reproducing heads 22A to 22D scan the scanning position F (FIG. 5), so that the recording and reproducing heads 22A to 22D sequentially perform draft scanning on the tracks TRI to TR4, and The same track T is recorded by subsequent recording heads 4A to 4D.
RI to TR4 are sequentially overwritten and scanned, and the respective recording signals SR1! recorded by the recording/reproducing heads 22A to 22D! . is overwritten.

At this time, similarly to the case described above with reference to FIG.
Even if it becomes impossible to record tc, this track TR
A recording signal S- is preliminarily applied to I by the recording/reproducing head 22A.
Because 0 is written as a draft, the recording data is almost continuously recorded in the area 17B recorded by the recording head 4A and the area 17A recorded by the recording/reproducing head 22A.

At this time, area 17B recorded by RAD 4A
Then, when reproducing only the recorded data of the sync block 5BVt (Fig. 4), where the data is discontinuous due to the boundary portion 19 of the recording area 17A recorded by the recording/reproducing head 22A, error correction means such as dropout compensation is used. By making the correction, it is possible to prevent the reproduced image from deteriorating within a practically sufficient range.

Therefore, clogs and the like occur in the recording heads 4A to 4D, and the recording signal SII! Even when e is not recorded, the recording/reproducing heads 22A to 22D record the recording signal S□. If the recording/reproducing head 22A~ is in a state where it can be recorded correctly,
Recording signal S□ by 22D. By writing the data as a draft, it is possible to prevent continuous recording data from being missing, which would deteriorate the reproduced image, in each track TRI, TR2, . . . .

In contrast, clogs and the like occur in the recording/reproducing heads 22A to 22D, resulting in a recording signal S□. Even if the draft is not correctly performed, the subsequent recording heads 4A to 4D produce the recording signal S□. If the recording head 4A to 4D is in a state where it can correctly record the recording signal S□. is recorded correctly.

In this way, one recording head 4A to 4D or 22A
~22D is the recording signal S□. Even if it is not possible to record correctly, the recording signal S is recorded accurately to the extent that only the recording data of the sync block SBV t where the boundary portion 19 occurs needs to be corrected during reproduction.

Therefore, the recording heads 4A to 4D or the recording/reproducing head 22A
Even if a recording error occurs in any one of 22D and 4A to 22D due to a clog or the like, the reproduced image will be reproduced within a practically sufficient range.
Unless 2D recording errors occur at the same time, it is possible to prevent recording data from being continuously lost.

Therefore, the probability that recorded data will be continuously deleted can be significantly reduced.

According to the above configuration, the recording/reproducing head 22A is preliminarily placed on the track on which the recording signal is to be recorded by the recording heads 4A to 4D.
By drafting the same recording signal S□ by ~22D, it is possible to significantly reduce the probability that continuous recording data omissions that degrade the reproduced image will occur.

By the way, by using a head for monitor playback in the normal recording mode as the draft head, overwriting can be performed with a simple overall configuration without the need to provide a new draft recording head. can.

(G3) Other Embodiments (1) In the above-mentioned embodiments, a case was described in which one field of digital pinned image signal was divided into six tracks and recorded, but the present invention is not limited to this. It can also be applied when recording on one track or other multiple tracks.

(2) In the above-mentioned embodiment, the case where the same recording signal is overwritten twice has been described, but the number of overwriting is not limited to this, and various times can be applied as long as it is two or more times.

(3) In the above embodiment, the present invention is applied to a digital VTR having a rotating drum consisting of four recording and reproducing systems, but the present invention is not limited to this.
Digital VTR with rotating drum of various numbers of heads
Furthermore, it can be applied to a fixed head type magnetic recording device.

(4) In the embodiments described above, the present invention is applied to digital V
Although the case where it is applied to TR has been described, the present invention is not limited to this, and the present invention is also applicable to a magnetic recording device that records recording signals on recording tracks on a magnetic tape, and further to recording recording signals on a recording medium such as a magneto-optical tape. It can be widely applied to other recording devices made like this.

Effects of the Invention As described above, according to the present invention, by overlappingly recording the same recording signal in the same recording area, it is possible to realize a video tape recorder that can reliably record the recording signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the video tape recorder according to the present invention, FIG. 2 is a route diagram showing the configuration of the rotating drum of the first embodiment, and FIGS. 3 and 4 are explanations of its operation. FIG. 5 is a block diagram showing a second embodiment of the video tape recorder according to the present invention, FIG. 6 is a route diagram showing the configuration of the rotating drum of the second embodiment, and FIG. 7 is a conventional one. A block diagram showing an example, FIGS. 8 to 10 are plan views showing the format on a magnetic tape, and FIG. 11 is a route diagram showing the configuration of a conventional rotating drum. 1...magnetic tape, 3...recording circuit,
4A, 4B, 4C, 4D... Recording head, 5A
, 5B, 5C15D... Playhead, 6...
...Reproduction circuit, 7.15.35...Rotating drum, 1O120...Video tape recorder, 1
2A, 12B, 12C, 12D... Draft recording head, 14.33... Delay circuit, 22A, 2
2B, 22C, 22D...recording/reproducing head.

Claims (2)

[Claims] (1) In a video tape recorder that records recording signals on recording tracks sequentially formed diagonally on a recording medium running in a predetermined direction, a first recording head transfers the recording signals to predetermined positions on the recording medium. A video tape recorder characterized in that, after draft recording is performed on the recording track, the recording signal is superimposed and recorded on the predetermined recording track by a second recording head. (2) The first recording head is a recording/reproducing head, and in the overwriting recording mode, the first recording head is controlled to move to the preceding side of the second recording head, and the second recording head performs recording scanning. The recording signal is written on the recording track in advance, and in other recording modes, the second recording head is moved to the trailing side and the recording signal recorded by the second recording head is monitored and reproduced. A video tape recorder according to claim 1, characterized in that the video tape recorder is configured to: