JPS6069877A - Video tape recorder editing device - Google Patents

Abstract

PURPOSE:To make insert editing possible without disturbing reproducing synchronism of video by running a reproducing head, which extracts a tracking control signal, in advance of a recording head and performing the tracking control with this signal. CONSTITUTION:Four magnetic heads 110A, 110B, 112A, and 112B are set to a rotary head drum 108 as shown in figure. Magnetic heads 110A and 110B are wide-band magnetic heads to record mainly video signals or the like on a video area 28 and reproduce them, and these magnetic heads are arranged with a phase difference of 180 deg. practically. Magnetic heads 112A and 112B are magnetic reproducing heads to read pilot signals f1-f4 and are arranged with a phase difference of 180 deg. and are placed in positions preceding magnetic heads 110A and 110B in the rotation direction of an arrow S1 of the drum 108. Since there is hardly the azimuth effect in these narrow-band low frequency magnetic heads, it is unnecessary that azimuths of them coincide with those of magnetic heads 110A and 110B in the rear.

Description

[Detailed Description of the Invention] The present invention relates to a videotape editing device, and more particularly, to a videotape editing device for inserting a collection into a videotape on which a tracking control signal is recorded together with a video signal and/or an audio signal using a helical scanning method. The present invention relates to a video cheap recorder editing device.

11 Inser I-editing, which records new footage (including sound R!1 in response to questions) on the recorded portion of the videotape, is done in order to avoid disturbing the video's +++ regeneration period. 11 on the trunk: 8 to ensure proper alignment and record new video signals
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Therefore, video or audio I
・Tracking river control (1
With a video cheap recorder that records ``i't+'', insert editing does not use the all-erase vent, but uses the previously recorded control signal as it is to convert it to the video.
The video signal was overwritten on the computer. However, for example, in a system in which video trunks and ranking signals are recorded in a superimposed manner, when a new video signal is recorded, the previous trunking control value -) is lost. Therefore, since trunking servo cannot be performed in this state, insert I-editing cannot be performed while accurately matching the previous record I rank.

(1) In view of these problems, the present invention inserts a trunking control signal into a video tape on which a video signal and/or an audio signal are recorded together with a helical scanning method without disturbing the video playback synchronization. An object of the present invention is to provide a video tape recorder editing device capable of editing video tapes.

According to the present invention, a video recorder editing device that performs insert editing in a method in which a tracking control signal is recorded along with a video signal on a video I rank using a helical scanning method rotates at a predetermined speed. a first vent carried by the rotating head assembly for recording a signal in the trunk; and a first vent carried by the rotating head assembly for recording a signal in the trunk;
``A second head carried by one body, a recording circuit means for supplying a video signal to the first head, and a trunking control signal is detected from the track via a second vent, and this tracking and tracking means for performing trunking control so that the first head follows the I rank in response to a control signal.

The present invention will now be described in detail with reference to the accompanying drawings.

For example, using the helical scanning method, video, sound, and I signals as well as tracking control signals are transmitted to video trunks! FIG. 1 shows an example of a recording formant of a videotape superimposed on -. According to this, the videotape 10 running in the direction of arrow H has the cue track 12 and the auxiliary fl, 7451. Rack 14 is recorded. A trunk 20 is recorded in a region between both trunks 12 and 14 by helical scanning. Here, for convenience of explanation 1--, the trunk 20 will be referred to as a "helical trunk."

The video area 28 mainly contains video signals and ? 'ffi
+¥5 communication) or FM recording. The data area 24 is
This is an optional area, which mainly includes the audio signal
CM is recorded. Also, in the circular areas 24 and 28, a signal for trunking control, that is, a pilot signal)
recorded. The frequency spectrum of the recorded signal is illustrated in FIG.

Pilot) (P) signal has four types of frequencies f, for example.
1. Using f2, f3 and f4, for example, the difference between frequencies f2 and fl, and the difference between f3 and f4 is about 16kHz
z, the difference between frequencies f3 and f2, and the difference between f4 and fl are approximately 46 kHz. Trunking servo is performed by detecting such a difference in pilot frequencies between adjacent tracks. Trunking control using such four-frequency pilot signals is called an ATF (automatic trunk following) method.

By the way, in insert editing, for example, all the signals recorded in the video area 28, including the pilot signal, are rewritten with new signals.

Therefore, unless trunking servo is performed by some method, a new message cannot be correctly written on the original trunk 20.

An embodiment of a videotape editing apparatus according to the present invention that solves this problem is shown in FIG. As conceptually indicated by a dotted line 100, the videotape 10, which is fed in the direction of arrow H by a capstan 104 driven by a capstan motor 102 and a pinch roller 106, is fed at a predetermined speed in the direction of arrow S.
To rotation that rotates steadily in the direction of 1 71" l・ui, 10
Drive around the edge of B. The length of the winding is approximately 2 in the above example.
21 or more -1. In addition, in the figure, elements that are not directly related to understanding the present invention are not shown to avoid complicating the figure.

As shown in the figure, the rotating bend driver AlO3 has four l-
Qihen l'1lOA, ll0B, 112A and UI1
2B is installed. Magnetic head ll0A and l
The IOB is a wide-area magnetic hand that records a video signal etc. in the video area 28 and also generates +Ir, and is arranged with a phase difference of substantially 180°. . The magnets 112A and 112B have a magnetic +Ir magnet for reading the pylond signal fl-f4, and are also arranged and sunk with a phase difference of 18Q° from each other, and in the direction of rotation S+ of the tram 108, the magnets 112A and 112B are connected to the magnet 112A and 112B.
It takes an i\' device that precedes OA and 110B. The smaller the distance between the magnetic heads 71.+12^ and 112B before the magnetic heads 110A and 110B, the smaller the amount of offset with respect to the magnetic bends 110A and 110B, which is advantageous.

These magnetic bends 112A, 112B, 112A and 112B may have substantially the same characteristics, but the magnetic heads 112A and 112B are designed to detect narrow band, low frequency pilot signals f1 to "4". In the latter case, the magnetic spatulas 112A and 112B do not need to form the width of the head camp so narrow as in the video head, and for example If the limit is about 200 kHz and the relative speed between the hent and the tape is about 3.8 m/sec, then about 9 m/sec is sufficient. Furthermore, such narrowband,
At low frequency magnetic hents, there is almost no asomass effect, so the magnetic hents 110A and I 108 located at the rear
It is not necessary to match the azimuth with the azimuth, and the azimuth may be O azimuth. Therefore, to magnetism, t112^ and ]12
For B, a low-cost one with a simple structure can be used. Furthermore, as will be described later, the ATF signal reproduction and control system does not include the video luminance signal component, causing interference to the signal recording system.
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Magnetic bends ll0A, ll0B, 112A and 11
2B is the winding 11 of the rotary lance 114, respectively.
Connected to BA, 116B, 118A and 118B. The output side of windings 116A and 116B, i.e. 2
The next side is as shown! /J (Connected to + contact 5lllll or SW5. Note that these cut base contacts S
For convenience of explanation, WI to SW5 are in the form of mechanical contacts, but in reality it is advantageous to implement them as electronic switches. In addition, the windings 118A and 11 of the rotary transformer 114
6B, 118A and 118B are normally located close to the companion car in the head tram assembly. However, as mentioned above, if you use 4,'r+1 different from 110A and 110B for magnetic 2A and 112B, the former will not pick up the imager's concentration, so Even if there is magnetic coupling between the phase/7: due to the close arrangement of the windings 118A, 11GB, 118A and 118B, there is little interference with the video signal.

9J base contact points SWI to SW5 are controlled by a mode control circuit 1213 as conceptually indicated by a dotted line 124. The mote control circuit 12B is a circuit that controls the operating mode of the mote switch, particularly the connection state of the contacts SWI to SW5, by control signals supplied to the control units 128, 130, 132 and 134. In this embodiment, these control signals are playback PB, recording REC, inserter) INS, and Bose P.
It is S. A tape count signal is also input from a tape counter 188 that counts the running length of the video tape 10. It should be noted that among the electric control lines that control each part of the water device from the mode control circuit 126, those that are not directly related to the understanding of the present invention are omitted from the diagram to avoid complication of the diagram.

Terminal A of the switching contact SW2 is the output 13 of the recording amplifier 138.
8, and the input power 139 of the recording amplifier 136 is connected to the output of the signal synthesis circuit 140. Synthesis circuit 140
The three inputs include F)4, gg door 1 circuit 142. Each output 148 of the video circuit 144 and the servo circuit 14Ei
, 150 and 152 are connected. Since the J switching contact S22 is connected to the two windings 1113A and 116B, the output signal of the recording amplifier 136 is
Supplied in parallel to both 10A and 110B.

Terminal B of switching contact SWI and terminal A of switching contact SW4 are 11
1 are connected together to an input 156A of a raw amplifier 154A,
The latter output +58 is a bandpass filter (BPF) 160
and to the input 166 of the servo circuit +48 via a low-pass filter (Li) F) 164.Similarly, the terminal fB of switching contact SW3 and the The terminals A of 5Il15 are both connected to the human power 15EiB of the Pf regenerative amplifier 154B, and the output of the latter is commonly connected to the output of the regenerative amplifier 154A.

Enable inputs 190A and 180B of both 11f raw amplifiers 154A and 1511B are alternately supplied with RF switching pulses, so that only the video domain 28 signal is output from these reproduction amplifiers 154^ and 154B.

The mode control circuit 12El connects the switching contacts 5WI-SW5,
In the normal ++4 cow mode, all connections are made to the terminal B side, and in the insert mode, all connections are made to the terminal A side.In the normal recording mode, contacts 5WI-3W3 are connected to the terminal A side, and contacts SW are connected to the terminal A side.
4 and SW5 are controlled to be connected to the terminal B side, respectively.

BPF 160 is a band pass filter with FMt' put into the voice circuit 142, and LPF 184 is about 200k.
This is a low-pass filter that has a cutoff frequency of Hz, passes pilot signals of frequencies f1 to f4, and inputs them to the servo circuit 146.

The FM audio circuit 142 demodulates the input +82 gap Ih signal and outputs it to the audio monitor 170 as ITr listening audio, or directly outputs it to the output 148 to the synthesis circuit 140, or inputs it from the external input 172. F
6 The video circuit 144 is a circuit that modulates the video signal from the input 168 and outputs it to the output 148.
74 as a visible image, or directly to the output 150 to the synthesis circuit 140, or to the external input 1.
This is a video processing circuit that outputs the video signal manually input from 78 to Inser 1-W to the output 15 (l).

The servo circuit 146 is a control circuit that mainly performs trunking servo control such as ATF. Servo circuit 14
The control output 178 of 6 is connected to a drive circuit +80 that drives the capstan motor 102, and its output 182 drives the motor 102.

The TF control section of the servo circuit 14B detects a pilot signal from an adjacent track as a crosstalk component;
The frequency difference with the main trunk is 18kHz and 4
8 kHz, and tracking control is performed by determining these two amplitude levels, and ATF control is performed.

The operation of this device will be explained with reference to the time chart shown in FIG. In the case of insert editing in which another video is recorded in a certain part of a videotape that has already been recorded, the tape counter 188 is set to O at the end of the insert part. Next, turn the device into rewind mode and rewind the tape to the front of the insert section.

When the playback button (not shown) of the device is operated at time tl (FIG. 4), the switches SWI-9W5 are respectively connected to the ends f-B.

In the 1'f raw state, the video heads ll0A and ll0B
The signals read from each helical track 20 by
) is FM via the il amplifier 154A or 154B.
Audio circuit 142. Video circuit 144 and servo circuit 14
6. Of course, in this state, the servo circuit 146
ATF control is performed using pilot frequencies fl-f4.

While watching the video monitor 174, when the beginning of the insert portion is reached at time t2, for example, a pause button (not shown) is operated, and the mode control circuit 126 temporarily stops the running of the tape IO using the Bose signal PS. .

Therefore, for example, at time t3, the insert button (
(not shown), the mode control circuit 126 changes to the insert mode in response to the insert signal INS, the video system changes from PB to the REC mode, and the servo system changes to the P mode.
Maintain B mode. The mode control circuit 126 controls the switches 5WI-5W5 and connects them all to the terminal A side. This allows the signals from 112A and 112B to be transferred to the magnetic regenerative amplifiers 154A and 154.
4B, and the 4B number from the recording amplifier 136 becomes ready to be supplied to the magnetic spatulas F110^ and 110B.

When the pause button is operated to cancel the pause at time t4, the mode control circuit 12B cancels the temporary stop of tape running and performs the insert operation.

At the same time, a video signal to be inserted is input to the video input terminal 178, and an audio signal to be inserted is input to the audio input terminal 172, if necessary.

In insert operation, magnetic heads 112A and 112
One of B, for example 112A, is one helical I
・Scan rank 20 and then magnetically apply l'1lOA
and 1] one side of the OB, i.e. vent 11 in this example.
0A scans the same track 20. When the heads 112A and 110A start scanning one trunk and the head drum +08 rotates approximately 180 degrees in the direction of arrow S1, the magnetic fields 71 and 110A move toward the other magnetic field, respectively.
112B and 110B enter the next track. Each trunk 20 has a drag z, +0 in the scanning direction S as described above.
Since it is expanded over a rotation angle of about 2'20',
For a rotation angle of approximately 30'' at the beginning of head entry, both sets of noses 112A, 112A, and 1128.110B are used.
will scan their corresponding tracks.

In this way heads 112A, ll0A and 11
In the insert mode in which the tracks 2B and 110B are scanning the track 20, the signals read from the magnetic heads 112A and 112B are supplied to the regenerative amplifiers 154A and 154B.
Then, the audio signal is supplied to the FM audio circuit 142, and the video signal is supplied to the video circuit +44.

On the other hand, the servo circuit 148 is connected to the head 112 as described above.
A due to pilot belief extracted at A or 112B
Performs TF control.

Therefore, the video signal to be inserted inputted from the external video input 171 is outputted to the output 150 of the video circuit 144, and the audio signal from the external input 172 or BPF 1. B
The audio signal read from the corresponding track 20 of the tape 10 is supplied from the reproducing amplifiers 154A and 154B via the LPF 164, which also appears at the output 152 of the servo circuit 146, to the reproducing amplifiers 154A and 154.
The pilot signal read from the corresponding track 20 of the tape 10 supplied from the tape 4B is synthesized by the synthesizing circuit 140 and input to the recording amplifier 13B.

This composite signal is sent to the magnetic vent 110^ and the magnetic vent 110 through the switch SW2 connected to the terminal A side.
8 in parallel and recorded in the video area 28 of the corresponding helical track 20. Since the FM luminance signal acts as a high frequency bias, if it is overwritten on a previously recorded signal, the information of the previous signal will be lost.
Information on the new signal will be recorded as valid information.

Note that in this example, since the PCM area 24, which is an optional area of the trunk 20, is not used, the same signal as the video area 28 is recorded in this area 24 as well as in the previous trunk. However, when recording signals on the PC in area 24, the head ll
A switching circuit may be provided in which 0A and 110B alternately switch with slight overlap every 180 degrees of rotation of the tram 108.

When the tape counter 118, which was previously set to O at the end of the insert portion, reaches O at time t5 (FIG. 4), the motor control circuit 12B responds to this by canceling the insert motor 14, and the field enters the stop mode. The insert editing operation ends.

In the insert editing operation in this embodiment, track 2
For the pilot signal newly recorded in 0, the pilot signal recorded in that trunk is input to the servo circuit 146, and the pilot signal of the same frequency is input to the synthesis circuit 1.
40 and is recorded on that track via a recording amplifier 136. Or the pilot of the track immediately before the pause in the playback operation up to time t2 in Figure 4! - The frequency of the signal may be identified and stored, thereby determining the next pilot frequency to be generated after the pause is released, and thereafter the pilot signal frequency may be sequentially switched in response to the RF switching pulse.

Effects--y As described above, the videotape editing apparatus according to the present invention outputs the trunking control signal prior to the recording head in the insert editing operation of the videotape on which the tracking control signal is recorded together with the video signal by the helical scanning method. The extracting reproducing head runs and is configured to perform tracking control, and can be configured with nine tracking signal reproducing heads.
A low-cost head can be used, and insert editing can be performed without disturbing video playback synchronization.

[Brief Description of the Drawings] The IF diagram is an explanatory diagram showing an example of the recording format of a videotape recorded by a helical scanning video tape recorder. FIG. 3 is a block diagram showing an embodiment of the videotape editing apparatus according to the present invention; FIG. 4 shows an insert editing operation in the embodiment of FIG. 3. FIG. 5 [10, , , , videotape 20, , , , helical track +02. , , Capstan motor + 1OA,
112A, magnetic head +26. , , , mote control circuit +38. , , recording amplifier +40. , , , Signal synthesis circuit 142, , , , FM audio circuit +44. , , , video circuit 14B, ゛, , , servo circuit 154A, 154B, regenerative amplifier +64. , , , low-pass filter SWI~SW5, switching contact

Claims (1)

[Scope of Claims] 1. A video cheap recorder editing device that performs insert editing in a helical scanning method in which a tracking control signal is recorded in video 1 rank L along with video A 1'f, the device comprising: a rotary head assembly that rotates at a predetermined speed; a first head that is supported by the rotary head assembly and records a signal-3 on the toner; a first head that rotates at a predetermined speed; Nohe. a second head carried in the assembly in a position preceding the head; recording circuit means for supplying video signals to the first head; A tracking control signal is detected from the track, and the first
2. A video tape recorder editing device comprising: trunking means for performing trunking control so that C follows the track. 2. The video tape recorder editing device according to claim 1, wherein the recording circuit means supplies a frequency-modulated video signal to the head of ff1l. 3. The apparatus according to claim 2, wherein the recording circuit means supplies a tracking control signal detected from the track via a second head to the first head. Cheap recorder editing device.