JPS60134573A - Video synthesis recorder - Google Patents

Abstract

PURPOSE:To obtain a video image of special effect easily even for a home use video tape recorder by adjusting a control signal of a magnetic tape with a prescribed phase relation with respect to a vertical synchronizing signal of a new video signal and inserting an inserted part for a desired period after a desired period is elapsed to a head changeover signal. CONSTITUTION:Phase control servo is applied to the running of a magnetic tape 10 to which a new video signal is inserted by using a control signal 26 of a track 12 of the tape 10 and a vertical synchronizing signal of the new video signal. As a result, the phase of the running of the tape 10 is adjusted so that the phase of the control signal 26 is provided with a prescribed phase relation to a vertical synchronizing signal VSYNC. The original video signal is reproduced on a video monitor 104 from magnetic heads 102A, 102B through a reproducing circuit 142. On the other hand, the inverted part 22 of the new video image is recorded to a part 22 corresponding to the track 16 from the heads 102A, 102B by throwing a switch 114 to the position opposite to the position as shown in the figure for the period. In this case, the original video signal is erased by being written with a new video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video synthesis recording device, particularly a magnetic tape on which a video signal is recorded, in which a part of the screen formed by the video signal is replaced with another video and recorded. The present invention relates to a video synthesis recording device that performs inserting.

Sometimes it is necessary to insert a new video signal into a magnetic tape on which a video signal has already been recorded so that a part of the screen can be replaced with a different video. For example, there may be cases where it is desired to record a video with a back title inserted into a screen that has already been recorded on a magnetic tape. In addition, if you want to record an ongoing event in the distance and foreground and combine them into one screen, you can record the combined video as one screen to compare two events that are progressing separately in parallel. There are cases where you want to do so.

Conventionally, two video signals output from a TV right camera or a video tape recorder have been partially combined to form one screen. However, no device has hitherto been proposed for performing such a partial insertion in one screen into a video signal already recorded on a magnetic tape by a video tape recorder, especially by Baum video.

Insert another video signal, i.e., a new video signal, output from another video signal source such as a TV right camera or a video tape recorder into the video signal already recorded on the magnetic tape, i.e., the original video signal. In this case, an important issue is how to synchronize the two video signals.

More specifically, the new video is always at the same position for each field, i.e. each field's vertical sync signal (event)
It must be inserted at a position spaced apart by a predetermined number of horizontal scanning lines (H). However, in general, no synchronization is established between the playback operation of the magnetic tape on which the original video signal is recorded and the operation of other sources that supply the new video signal, so no control is required. If this is not done, it will not be possible to always insert new images at the same position for each field, and when this is played back, the images will be distorted.

”-” In view of these demands, the present invention provides a video synthesis method that can insert a part of the screen formed by the video signal into another video and record it on a magnetic tape on which the video signal is recorded. The purpose is to provide &8 recording devices.

The video synthesis recording device according to the present invention includes a running means for running a magnetic tape on which a first video signal of a television format is recorded, and a plurality of magnetic heads, and a plurality of magnetic heads. a recording means for recording a video signal on the magnetic tape by running one of the leads on the magnetic tape; a detection means for detecting a control signal recorded on the magnetic tape; and a second video in television format. a synchronization extraction means for receiving the signal and extracting a vertical synchronization signal included in the second video signal; and controlling the traveling means based on the control signal detected by the detection means and the vertical synchronization signal extracted by the synchronization extraction means. , a first control means that adjusts the running of the magnetic tape so that the control signal has a predetermined phase relationship with the vertical synchronization signal; and a second control means for causing the recording means to record the second video signal on the magnetic tape from the time the first period has elapsed until the second time period has elapsed.

According to one aspect of the invention, the first and second time periods are each independently variable.

Next, an embodiment of the video synthesis recording apparatus according to the present invention will be described in detail with reference to the brazed drawings.

Before describing embodiments of the present apparatus, first, an insert for recording a part of the screen formed by the original video signal by replacing it with a new video will be described.

Referring to FIG. 1, an example of a recording format of a magnetic tape or videotape used for conventional home video is shown. In this example, a control track 12, an audio track 14, and a video track 1B are recorded on the magnetic tape 10 running in the direction of arrow P. Video track 1B has one vertical scanning period (m (in this example, l/
80 seconds), and in this example:
Two image magnetic helads 1 carried on a rotating head drum
02A and 102B (FIG. 4) run in the direction of arrow Q. Further, in the control track 12, a control signal (CTL) 2B is recorded every 2v period, that is, at 30 Hz.

In this embodiment, the original video signal is azimuthally recorded on each track 16. A new video signal 22 is inserted and recorded by this apparatus for only a certain period of time 2 from a position 20 which is a certain time of 1 after the position of the vertical synchronization signal (VSYNC) 18 at the beginning of each track 16. In the figure, the new video signal portion is indicated by hatching. These periods τ1 and τ2 are set substantially equal to an integral multiple of 1H.

A screen 24 as shown in FIG. 2A is reproduced from the video trunk 1B inserted and recorded in this manner. Screen 2
4 is one screen (field) of a television video reproduced on the video monitor device 104 shown in FIG. 3, for example.
It is. As will be seen from now on, a new image 22 is inserted for a period τ2 from a position separated by a period τ1 in the vertical scanning (V) direction.

According to the invention, these periods τ1 and τ2 are variable, and the position and size of the inserted portion 22, that is, the position and width in the V direction, can be manually adjusted. For example, if we set 1 to O in time, it will be inserted in the upper half of the screen as shown in Figure 2B, and if we make the sum of 2 in time and l to be substantially equal to 1v, it will be inserted in the upper half of the screen as shown in Figure 2C. inserted into the bottom half of the screen. Of course, insert part 2
The widths of 2 are also shown to be different in these figures.

An embodiment of the video synthesis recording apparatus according to the present invention that realizes such an insert is shown in the block diagrams of FIGS. 3 and 4. Two magnetic helads 102A and 102B are supported on a rotating magnetic head drum (not shown) which is rotationally driven in a predetermined rotational direction by a drum motor (M2) 10Ei, and these are rotated in the direction of an arrow by a capstan motor (old) 108. The magnetic tape 10 alternately runs in the direction of the arrow Q relative to the video track 16 of the magnetic tape 10 which is driven to run in the P direction.

Magnetic helads 102A and 102B are read and write heads or transducers, and their signal line 1
1OA and 110B 7 are connected to a switch 114 via a head switching circuit 112. The head switching circuit 112 is a circuit that alternately connects one of the two magnetic heads 102A and 102B to the switch 114 in response to a head switching signal supplied from the delay circuit 180 to the control line 11B via the interlace symbol A. It is.

The device has a signal input terminal 11B for manually inputting a new video signal to be inserted, which is connected to the switch 11 via a synchronization separation circuit 120 and a recording circuit 122 on the one hand.
It is connected to the terminal 124 of No. 4. On the other hand, it is also connected to the terminal 12B of another switch 126. The recording circuit 122 drives the magnetic healds 102A and 102B according to the video signal on the signal line 131, and records the video track 1.
This is the circuit that records this in B.

A television format video signal is input to the signal input terminal 118 from another video signal source such as a TV camera or a video tape recorder. Synchronous separation circuit 1
20 is a circuit for extracting the vertical synchronizing signal VSYN'G from this video signal. Its output 130 has a signal VSYNC.
is output, which is connected to the frequency divider circuit 132.

The output 134 of the divider circuit 132 is connected through an interlaced symbol B to switches 136, 138 and 140 of FIG. In this example, the frequency dividing circuit 132 is a circuit that divides the frequency of the 80 Hz signal VSYNC into 1/2 and outputs a 30 Hz frame frequency signal.

Switch 12B is connected to video monitor device 104 via playback circuit 142. As shown, switch 1
21 (is connected to the switch 114 by connection tJ1144. The regeneration circuit 142 is connected to the magnetic herad 102A
This circuit drives the video monitor device H104 in response to the video signal reproduced from the track 16 by 102B or the video signal input to the signal input terminal 118, and causes the video monitor H104 to display a video thereon.

Both switches 114 and 126 may be, for example, MO9 elements or relays, and their switching operations are controlled by a recording/reproduction switching signal forming circuit 158, as conceptually indicated by an arrow control line 14B. Recording/reproduction switching signal forming circuit 15
8 is an AND gate 1451 delay circuit 1 as shown in the figure.
48. Inverter 148. Monostable multibibreak (
MM) 150 and 152. OR gate 154. and a diode 156. The head switching signal 300 (FIG. 5) on the control line 116, which is the output of the delay circuit 180, is supplied to the input 116 of the recording/reproducing switching signal forming circuit 158 via an interlace symbol A. Further, the other input of the AND gate 145 receives a signal INS that is at a high level in the insert mode.

In this embodiment, the delay time of the delay circuit 148 is variable and can be manually adjusted as conceptually shown by the variable resistor 14γ. Furthermore, the time constants of the monostable multivibrators 150 and 152 are also variable, and as conceptually shown by the two variable resistors 151 and 153 associated with each other by a dotted line 155, both change by the same amount in conjunction with each other. It is manually adjustable.

Referring to FIG. 4, control track 1 of magnetic tape 10
A magnetic reproducing head or control head 16 running over 2
2 is connected to a Schmitt circuit 166 via an amplifier circuit 164. The output 168 of the Schmitt circuit 166 is connected to an automatic phase control circuit (APC) 1 via a switch 170.
72 and the output 174 of the automatic phase control circuit 172
is supplied to the capstan motor 108 through the amplifier 17B. A clock input terminal 178 of the automatic phase control circuit 172 is connected to a clock generator (C) through a switch 140.
The reference clock generated by LK) 180 or the frame frequency signal output from frequency divider circuit 132 (FIG. 3) are selectively supplied.

The frame frequency signal on signal line 134 is connected to switch 138.
The output 184 of automatic frequency control circuit 182 is also connected to amplifier 17B. Automatic frequency control circuit 18
The output of a frequency generator 188 is fed to the clock input 186 of 2 through an amplifier 180 and a Schmitt circuit 11+2. Further, the output of the Schmitt circuit 182 is also supplied to the switch 170 via the frequency dividing circuit 1E15. Frequency generator 188 is a tacho generator that generates a frequency according to the rotational speed of capstan motor 108. Therefore, automatic frequency control circuit 182 and frequency dividing circuit 195 are supplied with a frequency signal corresponding to the rotational speed of capstan motor 108.

The drum motor 106 includes a frequency generator 184 that generates a frequency according to its rotational speed, and a phase signal generator that generates a phase signal indicating the position of the magnetic healds 102A and 102B in the rotational direction according to the rotation of the rotary head drum. 186. The output of frequency generator 194 is input to automatic frequency control circuit 202 via amplifier 198 and Schmitt circuit 200, and output 204 of automatic frequency control circuit 202 is connected to drum motor 106 via amplifier 206. Further, the output of the phase signal generator 1H is input to the delay circuit 160 via the amplifier 208 and the Schmitt circuit 210, and
The output 11θ of 60 is the head switching signal 30O (Fig. 5)
On the one hand, it is connected to amplifier 20B via automatic phase control circuit 212. On the other hand, it is connected to the delay circuit 148 and head switching circuit 122 of FIG. 3 through the interlace symbol A. Automatic phase control circuit 21
A frame frequency signal is supplied from the frequency divider circuit 132 to the clock input of No. 2 via the switch 138.

In tape constant speed running mode such as normal recording and playback that is not insert mode, switch 138 and 138 in Figure 4
, 140 and 170 are connected in the opposite state to that shown, that is, on the B side. Therefore, automatic phase control circuit 17
2 and the automatic frequency control circuit 182 are supplied with a reference clock generated by a clock generator 180, and the frequency generator 188 of the capstan motor 108 feeds back a rotational speed signal, causing the capstan motor 108 to rotate at a constant speed. . A reference clock is also supplied to the automatic phase control circuit 2]2 from the clock generator 180, and feedback from the frequency generator 184 and the phase signal generator 186 causes the drum motor 10B to rotate at a constant speed and the head switching circuit 1
The magnetic heads 102A and 102B are alternately switched by the magnetic head 12 at a predetermined phase.

At this time, since it is not the insert mode, the signal INS is not supplied to the input 143 of the AND gate of the recording/reproducing switching signal forming circuit 158 in FIG. Therefore Swift 11
4 and 128 remain in the illustrated state or in the opposite state to the illustrated state 1E, and the video signals or signals read from the video I/rack 1G of the magnetic tape 10 by the magnetic heads 102A and 102B. Input terminal 118
A video signal inputted from the magnetic tape and recorded on the magnetic tape is reproduced by the reproduction circuit 142 on the video monitor device 104 as a visible image.

In insert mode, switch 13El, 138,1
40 and 170 switch to the state shown in FIG. 4, and signal 1NS is applied to input 143 of ND gate 145. A new video signal to be inserted is input to the video signal input terminal 118 from another source. Therefore, automatic frequency control is performed on the capstan motor 08 in relation to the vertical synchronizing signal VSYN(?) of this new video signal.

/ More specifically, the signal VSYNG separated from the new video signal by the synchronization separation circuit 120 is sent to the frequency division circuit 13.
The frequency is divided into 1/2 by 2, and is input to the automatic frequency control circuit 182 and the automatic phase control circuit 172 as a frame frequency signal of 30H2 in this example. Therefore, the automatic frequency control circuit 182 performs automatic frequency control on the capstan motor 108 based on the feedback from the frequency generator 188 based on the frame frequency signal of the new video signal, and also controls the capstan motor 108 on the control track 12 of the magnetic tape 10. The control head 1B2 detects the recorded control signal 2B with a repetition frequency of 30H2, and using this, the automatic phase control circuit 172 controls the control signal 26 to have a predetermined phase relationship with the vertical synchronization signal V3YNC. capstan motor 1
08 automatic phase control is performed.

The running of the magnetic tape 10 is controlled by phase control servo based on the control signal 26 of the control track 12 of the tape 10 and the vertical synchronization signal of the new video signal. the result,
In response to the vertical synchronizing signal VSYNC of a new video signal input to the input terminal 118 at a signal speed that is not under the control of this device, the control signal 26 has a predetermined phase relationship with the vertical synchronizing signals VSYN, C. magnetic tape! The phase of the zero run is adjusted.

Therefore, the rotation phase of the rotation drum motor 106 is also
It is controlled by the automatic phase control circuit 212 based not on the reference clock generated by the clock generator 180 but on the vertical synchronization signal VSYNC of the new video signal.

The original video signal is reproduced from the magnetic healds 102A and 102B to the video monitor 104 through the reproduction circuit 142. Part 22 of the new video to be inserted (Fig. 1,
2) are recorded from the magnetic heads 102A and 102B onto the corresponding portions 22 of the tracks 16 by switching the switch 114 to a state opposite to that shown in FIG. 3 for that period. At this time, since the video signal is recorded using frequency modulation and phase modulation, the original video signal is overwritten with a new video signal and erased.

Since the switch 126 is switched at the same time as the switch 114, the monitor device 104 can monitor the entire video into which the portion 22 has been inserted. In addition, video track 16
The function of reproducing the original video recorded on the monitor device 104 and the new video inserted into the monitor device 104 in this way is not essential to the idea of the present invention, and this reproducing function is not provided as a video synthesis recording device. It will be advantageous in handling the device if it is.

Switching of these switches 114 and 126 is controlled by a recording/reproducing switching signal forming circuit 158. In the insert mode, the signal INS is at a high level, so the hend switching signal 300 is transferred from the delay circuit 180 to the AND gate 145.
The signal passes through and is input to the delay circuit 148. The head switching signal 300 is time-delayed by l by a delay circuit 148 with a delay time determined by manual adjustment of the variable resistor 147, and is passed to the monostable monomultivibrator 150 on the one hand and to the monostable monomultivibrator 152 through the inverter 148 on the other hand. is input. The time constant τ2 of the monostable monomultivibrators 150 and 152 is dependent on the manual adjustment of two linked variable resistors 151 and 153.

The setting of 1 and τ2 in these periods determines the position at which the new image 22 is inserted in the vertical scanning direction of the screen and its width. Periods τ1 and τ
2 is variable from 0 to a time equal to a 1V period, the sum of which never exceeds 1V. Also, each is I
It is desirable that it is an integral multiple of H. For example, 1 in hours
If it is set to O, it will be inserted in the upper half of the screen as shown in Figure 2B, and if the sum of 2 is made substantially equal to 1v for time τ1, it will be inserted in the lower half of the screen as shown in Figure 2C. inserted. Of course, the width of the insert portion 22 can also be varied.

Output signal 302 of monostable monomultivibrator 150
and the output signal 30 of the monostable monomultivibrator 152
4 are combined in an OR gate 154, and a recording/reproducing switching signal 308 is outputted through a diode 156. The switches 114 and 126 are switched to the illustrated state, ie, the reproduction state, when the recording/reproduction switching signal 308 is at a low level, and are switched to the opposite state, ie, the recording state, when the recording/reproduction switching signal 308 is at a high level. Therefore, reproduction and recording are switched for each field (1v), and a video signal into which a new video signal portion 22 is inserted is recorded on the video track 16 of the magnetic tape 10.

To summarize, in the insert mode, the running of the magnetic tape 10 is phase adjusted such that the control signal 26 of the magnetic tape 10 maintains a predetermined phase relationship with the vertical synchronization signal VSYNC of the new video signal. Further, the new video signal portion 22 to be inserted is inserted for a desired period 2 after a desired period 1 has elapsed with respect to the head switching signal.

According to the present invention, it is possible to insert, in a magnetic tape on which a video signal is recorded, a part of the screen formed by the video signal by replacing it with another video.

Moreover, this video synthesis recording device can be constructed using a simple analog circuit without performing complicated digital processing on the video signal. Furthermore, since the position and width of the insert portion can be made variable, videos with various special effects can be obtained with simple operations even in home videos.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an example of the recording format of a magnetic tape used for normal home video, and Figures 28 to 2C show examples of screens with new video inserted into the original video. Explanatory diagrams, FIGS. 3 and 4 are block diagrams showing an embodiment of the video synthesis recording device according to the present invention, and FIG. 5 shows signals used to explain the operation of the recording/reproduction switching signal forming circuit in the embodiment of FIG. 4. FIG. !・) 7 10. , , ,Magnetic tape 16, , ,Video track 2B, ,Control signals 102A, 102B, Magnetic head +06. , , ,rotating rad drum motor 108, ,
, , Capstan motor +14.1.26', ,
Switch 147.151. , variable resistor 148, , , delay circuit 150.152. , monostable multivibrator 182
, ,', ,control head 188.194. , frequency generator 19B, , , phase signal generator 172.212. , automatic phase control circuit 182.202
．． , automatic frequency control circuit patent applicant Fuji Photo Film Co., Ltd. Figure 1 O

Claims (1)

[Scope of Claims] 1. A running means for running a magnetic tape on which a first video signal in a television format is recorded, and a plurality of magnetic heads, and any one of the magnetic heads is placed on the magnetic tape. a recording means for recording a video signal on the magnetic tape by running it; a detection means for detecting a control signal recorded on the magnetic tape; and a recording means for detecting a control signal recorded on the magnetic tape; synchronization extraction means for extracting a vertical synchronization signal included in the signal; controlling the traveling means based on the control signal detected by the detection means and the vertical synchronization signal extracted by the synchronization extraction means; a first control means for adjusting running of the magnetic tape so as to have a predetermined phase relationship with respect to vertical rotation No. 48; and after any one of the plurality of magnetic heads starts running over the magnetic tape. a second control means for causing the recording means to record a second video signal on the magnetic tape from the lapse of the first period until the lapse of the second period; Device. 2. In the device according to claim 1, the second control means includes a first adjustment means that makes the first period variable;
and a second adjusting means for making the second period variable. 3. The apparatus according to claim 1, wherein the recording means is configured to record a first record recorded on the magnetic tape.
The second control means has a function of reproducing the video signal of
A video synthesis recording device characterized in that the first video signal is reproduced by the recording means during periods other than the second period.