JPH0231579A - Dubbing system - Google Patents

Abstract

PURPOSE:To restore normal video signals by reproducing video signals while each track on which the normal video signals is scanned twice and recording the field of one-side normal video signals reproduced from each track by the two-track quantity. CONSTITUTION:Tracks A of normal fields and tracks B of faulty fields are alternately recorded on a tape-(1) at every track. The 1st picture recording VTR 2 records the video signals reproduced from the tracks A of the normal fields by means of one of two rotary heads at every other track. The 2nd reproducing VTR 4 reproduces a tape-(2) on which pictures are recorded by means of the 1st picture recording VTR 2, but the reproduction is performed by means of rotary heads A and A' which scan the tracks A of the normal fields by twice. Therefore, video signals reproduced by the 2nd reproducing VTR 4 become signals in which the same normal video signal field continues twice. Thus only video signals of normal fields can be reproduced even when a faulty magnetic tape is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dubbing system, and in particular, when one of the video signals consisting of a first field and a second field is a normal video signal field and the other is a normal video signal field, the present invention relates to a dubbing system. The first field is a defective video signal field. The present invention relates to a dubbing system for restoring a recording medium such as a magnetic tape in which second fields are recorded alternately on every other track to a recording medium such as a magnetic tape in which only fields of normal video signals are recorded.

(Prior Art) Recently, video cameras, video tape recorders (hereinafter referred to as V
(sometimes written as TR).

Coupled with the miniaturization and massization, camera dancing (video shooting) using a camera-integrated VTR (so-called video movie), which is a combination of these devices, has become popular.

In particular, there are an increasing number of cases in which general users perform camera dances using the video A movie at weddings, overseas trips, and the like.

Furthermore, in a video tape recorder, video signals are recorded on a magnetic tape using two rotating heads attached to a rotating drum. Then, the first rotary head is rotated by one of the rotary heads.
One field of the video signal consisting of the second field is recorded by the other rotary head as one track (inclined track).

(Problem to be Solved by the Invention) However, in the above video movie, one of the rotary heads (or the other rotary head) becomes defective due to dew or dust, making it impossible to record video signals correctly. There are things I can't do. For this reason, one field (
Alternatively, the track of the other rotary head) becomes a track of a defective video signal.

Therefore, on the magnetic tape, racks of defective fields and tracks of normal fields are alternately recorded on each track.

Therefore, when the defective magnetic tape is played back and viewed, it is almost impossible to see a normal screen. For this reason, it is a shame that you cannot see the normal playback screen, especially in the case of precious tapes taken with a camera at a wedding or overseas trip, which you will never be able to see again.

Therefore, the present invention solves the problems of the conventional technology described above,
The purpose of the present invention is to provide a dubbing system for restoring only a field of a normal video signal onto a recording medium such as a magnetic tape.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method in which one of the video signals consisting of the first and second fields is a normal video signal field and the other is a defective video signal field. As the field of the video signal, the first . A first reproducing means [1] for reproducing a first recording medium in which second fields are recorded alternately on every other track, and one of the video signals reproduced by this first reproducing means is normal. A first recording means [2] records only fields of a normal video signal on a second recording medium every other track, and the second recording medium recorded by this first recording means is connected to the normal recording medium. A second reproducing means [4] that scans and reproduces the track on which the video signal is recorded twice each time, and a field of one normal video signal reproduced by the second reproducing means is scanned twice for each track. The present invention provides a dubbing system comprising a second recording means [5] for recording on the recording medium of No. 3; One of the video signals constituted by the second field is a normal video signal field, and the other is a defective video signal field. A reproducing means [10] for reproducing a first recording medium in which second fields are recorded alternately on every other track, and a video signal reproduced by this reproducing means is input, and the other defective video signal is A first signal processing means [11] which replaces the field with a synchronization signal and a blank signal and outputs the same, and the video signal output from this first signal processing means is input, and one field of the normal video signal is inputted. It is equipped with a memory that stores only one field period, and one field of the normal video signal among the input video signals is output as is, and the other field is the field of the normal video signal stored in the memory one field before. Second signal processing means [1
2] and recording means [13] for recording the video signal output from the second signal processing means on a second recording medium.

(Embodiment) First, a first embodiment of the dubbing system according to the present invention will be described.

FIG. 1 is a block diagram showing a first embodiment of a dubbing system according to the present invention.

In this first embodiment, the first. A two-stage process of the second stage is performed. 3A shows the configuration for the first stage of processing, and FIG. 3B shows the configuration for the second stage of processing.

First, in the first stage of processing shown in FIG. are supplied and synchronously coupled.

The first reproduction VTR 1 reproduces the tape 3 having the track pattern shown in FIG. 2(a), and supplies this reproduced video signal to the second recording VTR 2.

The tape (2) has a normal track A of one field and a defective track B of the other field alternately recorded on each track.

The first recording VTR 2 records the supplied playback video signal on the tape and performs dubbing, but at this time, one of the two rotating heads plays track A of the normal field. Record only the video signal on every other track.

Therefore, no signal is recorded on track B of tape 2, as shown in the track pattern shown in FIG. 2(b).

Next, in the second stage of processing in FIG. 1(b), 4 indicates that the second playback VTR 15 is the second recording VTR.

The second reproduction VTR 4c reproduces the tape 2 recorded on the first recording VTR 2t'a. At this time, as shown in FIG. 3, the rotary heads A and A' are placed at opposing positions, and as shown in FIG. The image is played back while being scanned twice.

Therefore, the reproduced video signal of the second reproduction VTR 4 is a signal in which the same normal video signal field continues twice.

This reproduced video signal is supplied to the second recording VTR 5.

The second recording VTR 5 records the supplied reproduced video signal onto a tape (2) and performs dubbing.

Therefore, as shown in FIG. 2(C), on the tape (2), fields of the same normal video signal are successively recorded for two tracks each.

In FIG. 1(b), 6 is a synchroscope (monitors the input and output waveforms of the second recording VTR 5), and 7 is the first . 2nd field confirmation monitor Arrow and 8 are monitors, which check the state of the reproduced video signal of the second reproduction VTR 4 supplied to the second recording VTR 5, and adjust the tracking of the second reproduction VTR 4 to obtain the optimal signal. etc.

As described above, it is possible to restore the tape (2) on which only normal video signal fields are recorded through the first and second steps.

In the above process, the audio signals recorded on the audio tracks in the longitudinal direction of the tape are normally dubbed.

Next, a second embodiment of the dubbing system according to the present invention will be described.

FIG. 4 is a block diagram showing a second embodiment of the dubbing system according to the present invention, and FIG. 5 is a diagram showing signal waveforms of various parts in FIG.

In the same figure, 10 is a playback VTR 111%, t processor, 12 is a frame synchronizer, and 13 is a recording VTR.
It is.

Further, 14 is a monitor for checking the state of the reproduced video signal of the reproduction VTR 1G.

Furthermore, 15 is a synchroscope for monitoring the input and output waveforms of the processor 11.

Furthermore, 16 is the first. 2nd field confirmation monitor, 1
A monitor 7 and a waveform monitor 18 are used to check the state of the output video signal of the frame synchronizer 12 that is supplied to the recording VTR 13, and perform various adjustments to obtain the optimal signal.

In addition, if necessary, 1. The state of the reproduced video signal of the reproduction VTR 10 is confirmed by the second field confirmation monitor 16, and various adjustments are made.

19 is a synchronizing signal generator, a reproduction VTR 10, a processor 11. Frame synchronizer 12. Recording VTR1
3. The same synchronizing signal is supplied to the synchroscope 15 and the waveform monitor 18, respectively, and these are synchronously coupled.

The reproduction VTR 10, like the first reproduction VTRI of the first embodiment described above, is a tape on which a normal track of one field and a defective track of the other field are alternately recorded for each track. Tape in Figure 2 (a) ■
), and this reproduced video signal (waveform in Fig. 5(a))
is supplied to the processor 11.

In this case, the reproduction VTR 10 performs synchronous reproduction by turning on and off the frame servo off power so that the defective field becomes the first field.

The processor 11 is supplied with a synchronization signal (black burst) as shown in FIG. 5(b) from the synchronization generator 19, and is supplied with a synchronization signal (black burst) as shown in FIG. 5(C) from the frame synchronizer 12.
An advanced sink is provided as shown in the figure below.

Note that this advance sync is a signal whose phase is advanced by 23H (H is a horizontal scanning period) with respect to the synchronization signal @ (black burst).

Then, the processor 11 sufficiently covers the fields before and after the field (first field) of the defective video signal of the supplied video signal (input video signal), and also covers the vertical synchronization signals before and after the field (first field). ) At the timing of the switching pulse shown in FIG. 5(d), the input video signal has a defective video signal field (first field), a synchronization signal (black burst), and a blank pulse shown in FIG. 5(e). The signal (processor output) shown in FIG. 5(f) is obtained by replacing the
Supply to 2.

Here, the advance sync in FIG. 5(C) uses switching pulses (waveform in FIG. 5(d)) and blank pulses (waveform in FIG. 5(d)).
It is used as a reference signal to stably create the waveform shown in FIG. 5(e). Further, the blank pulse has a pulse width of about 1oH and is located at the last timing of the first field. The switching pulses cover approximately 108 times before and after the first field.

The frame synchronizer 12 has a digital IC memory (
field memory), in which video information for one field of the input video signal is written in synchronization with the input video signal (processor output), and
By reading this in field synchronization, the input video signal (processor output) can be output with a delay of one field period.

The frame synchronizer 12 refers to the synchronization signals (black burst) and blank pulses before and after the first field (the field in which the defective video signal was replaced) of the processor output shown in FIG. By delaying the second field (normal video signal field) by one field period using the above field memory, the second field one field before is output during the period when the first field is output, and the second field is output. During this period, the second field is output as is.

In other words, instead of the first field, the normal second field one field before is replaced and output, and the normal second field is replaced.
Each field is output twice.

The output of this frame synchronizer 12 is shown in Fig. 5(g).
Shown below.

The recording VTR 13 is the video signal (restored video signal) shown in FIG. 5(g) output from the frame synchronizer 12.
Record it on another tape and dub it.

In the manner described above, it is possible to restore a tape (tape ■ in FIG. 2(C)) on which only fields of normal video signals are recorded.

Note that in the above processing, the first
As in the embodiment, the audio signals recorded on the audio tracks in the longitudinal direction of the tape are normally dubbed.

FIG. 6 is a block diagram showing a more detailed configuration of the processor 11.

In the figure, a reproduced video signal (waveform in FIG. 5(a)) of a reproduced VTR 10 is input to an input terminal 21, and a reproduced video signal (waveform in FIG.
A synchronization signal (black burst) (waveform in Fig. 5(b)) is input to the input terminal 23, and an advance sync signal (Fig. 5(b)) is input to the input terminal 23.
C) waveform) are respectively input.

The input video signal (a) is supplied to a switching circuit 25 via an amplifier 24.

Further, the synchronization signal (black burst) (b) is supplied to the switching circuit 25 via the amplifier 26.

Further, the advance sync (C) is supplied to the vertical synchronization separation circuit 28 via the synchronization separation circuit 27.

The output of the vertical synchronization separation circuit 28 is sent to the phase adjustment circuit 29°3.
0, 31 and 32, respectively.

The output of the phase adjustment circuit 29 is a 1/2 flip-flop 33 which divides the frequency by 1/2, a 1/4 flip-flop 34 which divides the frequency by 1/4, and a buffer ? 35 to the matrix circuit (
(switching pulse matrix circuit) 36. Further, the output of the 1/2 flip-flop 33 is supplied to the matrix circuit 3G via a buffer 37.

The output of the matrix circuit 36 is then transferred to a buffer 738.
, or supplied to the switching circuit 25 as a switching pulse (d) via buffers 38 and 39.

On the other hand, the output of the phase adjustment circuit 30 is divided by 1/172.
The signal is supplied to a matrix circuit (blank pulse matrix circuit) 43 via a 1/4 flip-flop 40, a 1/4 flip-flop 41, and a buffer 42. Further, the output of the 1/2 flip-flop 40 is also supplied to the matrix circuit 43 via the buffer 44.

Further, the output of the phase adjustment circuit 31 (synchronous pulse) and the output of the phase adjustment circuit 32 (blank pulse) are also supplied to the matrix circuit 43.

The output of the matrix circuit 43 is then supplied to the switching circuit 25 as a blank pulse (e).

In the switching circuit 25, as described above, the incoming video signal (a) is switched at the timing of the switching pulse (d).
a field (first field) of a defective video signal;
A synchronizing signal (black burst) (1)) and a blank pulse (e) are exchanged, and this is outputted from an output terminal 46 as a processor output (f) via an amplifier 45 and supplied to the frame synchronizer 12.

Note that in the above processor 11, the playback VTR 10
Frame synchronizer 1 by the tape played in
Since the best operating points of the two are different, the switching pulse (d
) and the timing of the blank pulse (e).

Further, in the processor 11 described above, the input video signal (a)
The direct current (DC) level of the second field of the processor output (f) is likely to change depending on the brightness and darkness of the field and the presence or absence of the first field signal (defective video signal), so adjust the DC balance between the first field and the second field. Let's do it.

With the dubbing system described above, for example, a valuable tape that will never be played again is a defective tape that has one defective rotating head and has a defective video signal field on one side, making it impossible to see the normal playback screen. However, it is possible to dub the defective tape and restore it to a normal tape that allows you to see both sides of the tape.

In the above-mentioned embodiments, a case has been described in which a video signal recorded on a magnetic tape by a VTR is dubbed onto a magnetic tape, but the present invention is also applicable to dubbing performed by a disk recording/reproducing device using a magnetic disk or the like as a recording medium. It is also possible.

(Effect of the invention) As described above, according to the dubbing system of the present invention, the first
．． A record in which the first and second fields are alternately recorded every other track, with one of the video signals consisting of the second field being a normal video signal field and the other being a defective video signal field. A recording medium in which only fields of normal video signals are recorded can be restored from the medium.

[Brief explanation of the drawing]

1 and 4 are block diagrams showing each embodiment of the dubbing system according to the present invention, FIG. 2 is a diagram showing the tape pattern at each stage in the embodiment of the present invention, and FIG. 3 is a diagram showing the tape pattern at each stage in the embodiment of the present invention. 5 is a diagram showing the arrangement, FIG. 5 is a diagram without showing signal waveforms of each part in FIG. 4, and FIG. 6 is a block diagram showing a more detailed configuration of a part of the embodiment of FIG. 4. 1... 1st reproduction VTR, 2... 18th picture VTR. 3.19... Synchronization signal generator, 4... Second reproduction VT
R15...2nd recording mVTR, 10-% raw VTR. 11...Processor, 12...Frame synchronization, 13...Recording VTR. Patent Applicant: Japan Victor Co., Ltd. Representative Umiki
Japanese map chart

Claims (2)

[Claims] (1) One of the video signals consisting of the first and second fields is a normal video signal field and the other is a defective video signal field, and the first and second fields are arranged every other track. a first reproducing means for reproducing the first recording medium recorded alternately on the first recording medium; and a field of only one normal video signal of the video signals reproduced by the first reproducing means every other track. a first recording means for recording on a second recording medium; and the second recording medium recorded by the first recording means, while scanning the track on which the normal video signal is recorded twice each time. A dubbing system comprising a second reproducing means for reproducing, and a second recording means for recording two tracks of fields of one normal video signal reproduced by the second reproducing means onto a third recording medium. . (2) One of the video signals consisting of the first and second fields is a normal video signal field and the other is a defective video signal field, and the first and second fields are arranged every other track. a reproducing means for reproducing a first recording medium recorded alternately on the first recording medium; a video signal reproduced by the reproducing means is inputted, and the field of the other defective video signal is replaced with a synchronization signal and a blank signal; A first signal processing means for outputting the video signal; and a memory for storing the field of one normal video signal for one field period, into which the video signal output from the first signal processing means is input; One field of the normal video signal among the signals is output as is, and the other field is the one stored in the memory.
a second signal processing means for outputting the normal video signal field in place of the previous field, and a second signal processing means for outputting the video signal outputted from the second signal processing means;
A dubbing system consisting of a recording means for recording on a recording medium.