JPS58114582A - Record device for video signal - Google Patents

Abstract

PURPOSE:To edit a color video signal without any hindrance by superposing two pieces of synchronized frame information on a control signal together with a two-phase recording signal to record. CONSTITUTION:A video signal supplied to an input terminal 4 is supplied to a two-phase encoder 5, where it is divided into two phases, i.e. phases A and B and also its time axis is expanded. Those signals of the two phases are supplied to recording terminals of video recording changeover switches 3A and 3B through FM modulators 6A and 6B and recording amplifiers 7A and 7B. On the basis of a horizontal synchronizing signal, an address generator 8 generates an address of every line. A two-frame pulse generator generates a pulse signal FP indicating the 1st frame. This pulse signal and input video signal are supplied to a recording control signal generating circuit 10 and then supplied to the recording-side terminal of a switch 3C through a recording amplifier 11. At the same time, the control signal CTL is supplied to a capstan servo circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video signal recording device that divides and records a video signal into a plurality of recording tracks.

When recording and playing back a wideband video signal such as a high-definition video signal with approximately twice the number of lines as usual, or when using a VTR that uses a small-diameter rotating drum, the relative speed between the rotating head and tape is slow. When recording a video signal, it has been proposed to divide it into, for example, co-phase (two channels) in units of horizontal sections, expand the time axis, and record on two recording racks. Interlaced video signal 1j: For example, the number of lines in /frame is odd 1al
Therefore, if the time axis is expanded by dividing each line into the Ω phase of the A phase and B phase, the video signal of the U phase after time axis expansion will be compared to the line number of the original video signal. The line numbers have the relationship shown in FIG. 1, and as can be seen from FIG. 1, the same pattern is repeated every coframe. When editing a video signal divided into co-phases, if the frame relationship between the previously recorded signal and the newly recorded signal is not synchronized, signal discontinuity will occur at the editing point.

Figure 2 is used to explain the problem during editing.The video signal (playback signal) of the previously recorded phase is shown in Figure 2A, and the newly recorded video When the signal is as shown in Figure B, if the editing point is the position where the line number of the previously recorded video signal of the human face changes, the video signal of the human face after editing will be as shown in Figure B. If the video signal includes a discontinuous portion as shown in C, a problem arises in that when time axis compression processing is performed, the video signal for 2 minutes of the discontinuous portion is lost.

In order to solve the problems that occur during editing as described above, this invention provides an Ω
Frame information is recorded superimposed on a control signal. By synchronizing this Ω frame information with Ω frame information synchronized with the newly recorded physiognomy video signal, continuity at the edit point can be maintained. Further, according to the present invention, the color frame information of the color video signal and the frame information of the above-mentioned physiognomy video signal are made to be in phase, so that the color video signal can be edited without any trouble.

An embodiment of this invention will be described below. In this embodiment, a helical scan type VTR is used to record phase and B phase video signals (modulated) on each of parallel inclined bidet tracks, and to The control signal shown in FIG. 3A is recorded on the extending control track. This control signal O
TL C has a delayed phase with respect to the line number of the physiognomic video signal shown in FIG. 3B. Further, the reference λ frame pulse regarding the human face video signal also has a phase delayed with respect to the line number of the video signal, as shown in FIG. This phase relationship between the three signals is an example determined in consideration of the tracking servo of the VTR.

The control signal cTL is a signal whose level is inverted every / field and a pulse signal FP is added to the beginning position of the first frame.
Represents frame information.

In an embodiment of the present invention shown in FIG. 7, a physiognomic encoder on the recording side is synchronized with a reproduction control signal (two-frame information).

In FIG. 7, 1 person and 1B indicate the rotating head of the recording side VTR, 1C indicates the fixed control head,
2 indicates the magnetic tee with which these heads slide. The rotary heads 1 and 1B exchange signals via a rotary transformer (not shown), and the rotary heads 1 and 1B simultaneously scan the same video track from the magnetic tape 2 to record the physiognomy and B phase. The signals are simultaneously reproduced and supplied to the reproduction side terminals (indicated by black circles) of the recording/reproduction changeover switches 3A and 3B. In addition, the recording/playback switch 3A and 3B
A signal to be newly recorded is supplied to the recording side terminal (indicated by a white circle).

A video signal supplied from an input terminal indicated by 4 is supplied to a physiognomic encoder 5, where it is divided into two phases, A and B, and is time-axis expanded. The physiognomy encoder 5 once converts the video signal into a digital signal, writes this into a memory such as RAM, controls the read address to divide it into physiognomy, and sets the read clock at a lower frequency than the write clock. This extends the time axis, and furthermore, D
/A converter converts the video signal back to an analog video signal. Then, it is supplied to FM modulators 6A and 6B, and FM modulation is performed such that each level of the sync tip and white tip is, for example, 3.3 (MHz:] and !; MHz, and this modulated video signal, that is, A recording signal is supplied to recording side terminals of recording/reproducing changeover switches 3A and 3B via recording amplifiers 7A and 7B.

An address generator 8 is provided for the memory of the physiognomic encoder 5 described above. This address generator 8 generates a line-by-line address based on a horizontal synchronization signal separated from the input video signal. A λ frame pulse generator 9 is also provided, which generates a reset pulse for the address generator 8 every λ frame, and also generates a pulse signal FP indicating the first frame of the physiognomic video signal. This pulse signal and the input video signal are supplied to the recording control signal generation circuit 10, where a recording control signal OTL is formed as shown in FIG. be done. At the same time, a control signal OTL is supplied to the capstan servo circuit 12. 13 indicates a capstan motor.

Also, a reproduction control signal F reproduced from the control track of the magnetic tape 2 and passed through the reproduction amplifier 14
B and OTL are supplied to the capstan servo circuit 12 and the Ω frame pulse decoder 15. Playback control signals PB, C! The capstancer TL is compared with a reference signal in a circuit 12 and tracking servo is applied. Further, in the Ω frame pulse decoder 15, a co-frame pulse is formed by detecting the pulse signal FP. This a-frame pulse is supplied to a λ-frame pulse generator 9.

During editing, the recording VTR and playback VTR enter the play state from a position several seconds before the editing point, perform phase adjustment,
A video signal from a playback VTR is supplied from an input terminal 4 to a physiognomic encoder 5. On the other hand, control head 1
Since a reproduced co-frame pulse synchronized with the reproduction control signals FB and OTL reproduced at C is generated from the co-frame pulse decoder 15, by synchronizing the a-frame pulse generator 9 with this reproduced λ frame pulse, the co-frame pulse is Physiognomy and B generated from phase encoder lf5
The phase video signal has the same frame relationship as that recorded on the magnetic tape 2. And at the editing point,
When the recording/reproducing switch 3A13Ey30 is switched to the recording state, a new human face video signal is recorded without causing any discontinuity with the originally recorded A-phase video signal.

FIG. 3 shows another embodiment of the invention. In this other embodiment, a reference video signal supplied from terminal 16 is supplied to a reference a-frame pulse generator 17, and both a reproduction VTR and a recording VTR are synchronized with respect to this reference a-frame pulse. A reference control signal is generated by a reference control signal generator 18 from the reference frame pulse and the reference video signal, and is supplied to the capstan servo circuit 12 of each VTR. The signal is then compared with the reproduction control signals FB, 0TT- reproduced by the control head 1C of each VTR, and the speed of the capstan motor 13 of each VTR is controlled so that the phases of the two coincide.

Then, the physiognomic signals reproduced by the rotating heads 1 and 1B of the reproduction VTR are sent to the time base collector via the reproduction side terminals of the recording/reproduction changeover switches 3A and 3B, the reproduction amplifiers 19A and 19B, and the IFM demodulators 20A and 20B. 2
1A and 21B, and time axis fluctuations are removed and time axis expansion is removed.

The video signals of the physiognomy appearing at the outputs of the time base collectors 21A and 21B are supplied as they are to the 7M modulators 6A and 6B of the recording VTR. In the other embodiment shown in Fig. 3, the VTR on the stand is synchronized with the reference co-frame pulse, so it is possible to edit and record the video signal of the physiognomy using the recording VTR. , a physiognomic encoder is not required.

Therefore, there is an advantage that there is no deterioration in image quality caused by passing the image through the physiognomic encoder.

FIG. 4 shows yet another embodiment of the invention.

In this embodiment, a phase comparison circuit 22 compares the reproduction Ω frame pulse from the recording VTR and the reproduction Ω frame pulse from the reproduction VTR, controls the switch circuit 23 based on the comparison output, and if they are in phase, the time base The two-phase video signals from collectors 21A and 21B are
1: Supply to the 7M modulators 6A and 6E of the recording VTR,
If the phases are opposite, the switch circuit 23 switches between the human phase and B.
7M modulators 6A and 6B of the recording VTR by switching the phases with the recording VTR.
It was designed to be supplied to This switch circuit 2
Switches 24A and 24B inserted between the 3M and 7M modulators 6A and 6B supply the video signal supplied from the input terminal 4 to the physiognomy encoder 5 to convert the physiognomy video signal obtained from the above-mentioned This is for switching between the output of the switch circuit 23 and the output of the switch circuit 23.

In the embodiment shown in FIG. 6, the line numbers of the original video signal shown in FIG. 7A are changed as shown in FIG. 7B.
The facial features are divided so that the line numbers of the facial features and B phase change. As is clear from Fig. 7B, by shifting the phase by /gO0 between the human face and the B phase, the human face in the first frame and the B phase in the co-frame are aligned. Therefore, the B phase of the 7th frame and the human figure of the 7th coframe match. Therefore, as described above, continuity at the editing point can be maintained by leaving the human phase and B phase of the video signal newly recorded by the switch circuit 23 as they are, or by replacing them.

Still, the seventh frame in FIG. 1 is phase-locked to the first and second co-fields of the color video signal;
By phase-locking the frame to the third and third fields of the color video signal (color frame B),
The pulse signal FP superimposed on the control signal is
It indicates both the two-frame information of the co-phase video signal and the co-frame information of the color frame. In the case of the PAL system, the color frame information is 7 frame information, but in this case as well, the a frame information and the green frame information in the case of co-phase can be made to be in the same phase.

, -11- FIG. 3 shows a configuration for making the U frame information and the color frame information of the co-phase video signal in phase in this way. An NTSG color video signal is supplied from the input terminal 4, divided into co-phases by a λ-phase encoder 5, and sent to FM modulators 6A and 6B and a recording amplifier 7A.
and 7 Br are supplied to the rotary heads 1 and 1B via the recording/reproducing switches 3A and 3B, respectively, and recorded on the magnetic chip 702.

In this case, a color frame pulse generator 25 is provided to form a /j Hz color frame pulse synchronized with the input color video signal, and this color frame pulse divides the line of the λ-phase encoder 5 into A phase and B phase. Orientation will be held. If it is a color frame A, a yellow-phase color video signal will appear from the co-phase encoder 5 in the relationship shown by the first frame and the co-frame in FIG. 1, and if it is a color frame B,
A co-phase color video signal appears from the co-phase encoder 5 in the relationship shown by the third frame and the first frame in FIG. Further, the color frame pulse is supplied to the recording control signal generation circuit 10, and a control signal OTL having both co-frame information and color frame information of the co-phase video signal can be obtained at its output, which is used for recording. Amplifier 11 and recording/playback switch 3
The signal is supplied to the control head 1C via C and recorded on the magnetic tape 2.

As can be understood from the description of the embodiments described above, according to the present invention, when the line number of a /frame is an odd number, a predetermined number of frames generated when recording is divided into polyphases is used as a unit. Since the frame information synchronized with the repetition is recorded superimposed on the control signal, it is possible to prevent discontinuity of the signal from occurring at the editing point during editing.

Generally, when the number of lines in a /frame is N and n-phase recording is performed, the same pattern is repeated in the frame (where [-] means an integer). Further, in this invention, by keeping the co-frame information of the co-phase signal in the same phase as the color frame information, the λ frame information detected during recording and reproduction of the color video signal can be used for both. There is.

[Brief explanation of the drawing]

Figure 1 is a route map showing the relationship between the line number of the original video signal and the line number of the co-phase signal, Figure 1 is a route map used to explain problems when editing the co-phase signal, and Figure 3 is Waveform diagrams used to explain control signals in one embodiment of this invention, FIG. 9 is a block diagram of one embodiment of this invention, FIG. S is a block diagram of another embodiment of this invention, and FIGS. 7
The figure shows a block diagram of still another embodiment of the present invention and a route map used for explaining the same, and FIG. 3 shows an example of a configuration for recording co-phase frame information and color frame information so that the control signal has it. FIG. IA, IB...Rotating head, 1C...
・・・・・・Control head, 2・・・・・・・・・
・Magnetic tape, 5・・・・・・・・・Co-phase encoder,
10... Recording control signal generation circuit, 12... Cazostan servo circuit, 1
5...Ω frame pulse decoder, 16...
...Reference video signal input terminal, 22...
...Phase comparison circuit. Agent Tadashi Sugiura 15 - ゛ Request (21 Tobicho; ~ Yodo

Claims (2)

[Claims] (1) The time axis of the input video signal is expanded by n times in units of horizontal sections, and this time-axis expanded video signal is sequentially divided into n recording tracks for each horizontal section, and A video signal recording device configured to record a pulse signal indicating a continuous position in frame units of a video signal divided into sections and recorded by superimposing it on a control signal. (2) A patent claim in which the time axis of the input video signal is expanded by a factor of 1, and the pulse signal is multiplied by color frame information of the input video signal, and the pulse signal is multiplied by color frame information of the input video signal. A video signal recording device according to item 1.