JP2745982B2 - Composite video signal editing method and composite video signal editing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite video signal editing method and a composite video signal editing apparatus.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional electronic editing system, FIG. 5 is a flowchart of a conventional electronic editing system, FIG. 6 is a conceptual diagram for explaining editing with priority given to an editing position, and FIG. FIG. 9 is a conceptual diagram for describing editing in which a frame is prioritized. Hereinafter, a conventional technique will be described with reference to the drawings.

In FIG. 4, a master VTR 1 is a reproducing side of a video / audio signal, and the reproduced signal is supplied to a slave VTR 2 which is a recording side and is recorded. These VTRs are controlled by the editing device CT to execute editing. Further, in order to synchronize the color frames of the video signal, the color frame signal CF is supplied to each device. Note that this color frame signal CF is NTSC
The system has a 4-field period and the PAL system has an 8-field period, which differs depending on the broadcasting system. Hereinafter, the NTSC system will be described as an example.

Next, the relationship between the above-described components will be clarified while explaining the flowchart of the conventional electronic editing system with reference to FIG. In the figure, first, electronic editing starts from step S1. When step S1 ends, the process proceeds to step S2.

In step S2, an editing start point is input by operating the editing device CT, and the master VT is input before dubbing.
Preroll R1 and slave VTR2. At this point, neither VTR is synchronized with the color frame signal CF. When step S2 ends, the process proceeds to step S3.

In step S3, the master VTR 1 on the reproducing side receives the color frame signal CF and synchronizes the running of the magnetic tape with the color frame signal CF. Then, step S3
Is completed, the process proceeds to step S4.

At step S4, the phase of the slave VTR 2 is adjusted with respect to the master VTR 1. That is, the master VT
A command signal for comparing the traveling position information of the magnetic tape supplied from R1 and the traveling position information of the magnetic tape supplied from the slave VTR2 with the editing device CT, and varying the traveling speed of the slave VTR2 so that they match. Is supplied from the editing device CT to the slave VTR 2. If the running speeds of both VTRs match after the end of the phase adjustment, the editing start points of both VTRs match at the same time.
When step S4 ends, the process proceeds to step S5.

In step S5, similarly to step S3, the recording side slave VTR 2 receives the color frame signal CF and synchronizes the running of the magnetic tape with the color frame signal CF. When the synchronization is performed, the editing start point of the slave VTR 2 may be shifted. When step S5 ends, the process proceeds to step S6.

In step S6, editing is executed to dub the magnetic tape. When this is completed, the process proceeds to step S7, where the editing is completed.

[0010] As described above, conventionally, color video signals have been edited.

[0011]

However, in the above-described conventional editing system, the slave VTR 2 is synchronized with the color frame signal CF in step S5, so that the continuity of the color frame can be maintained, but the editing start point of the slave VTR 2 can be maintained. May be shifted.
This point will be described with reference to FIGS.

FIG. 6 illustrates the relationship between the editing position and the color frame when the editing position is prioritized. The relationship between the editing position and the color frame is not directly related to the above-described prior art, but will be described to clarify the problem. FIG. 3A shows a color frame of the color frame signal CF, and “a”, “b”, “c”, and “d” in the figure are symbols representing the respective color frames. . FIG. 2B shows a color frame of the master VTR 1, in which "P-2 to P + 1" are frame numbers indicating the order of the frames, and a downward arrow indicates an edit. This is the starting point. Further, FIG. 3C shows a color frame of the slave VTR 2, and “Q-1 to Q-1” in FIG.
“Q + 2” is a frame number indicating the order of frames,
The upward arrow is the editing start point.

When editing is performed with priority given to the editing start position, the frame number of the edited magnetic tape becomes "... Q-
1, Q, P, P + 1..., But when the frame number is switched from the frame number Q to the frame number P, the color frame is switched from “b” to “a”. When reproducing a magnetic tape, there is a problem that colors are disturbed at an editing start point.

On the other hand, FIG. 7 shows the relationship between the editing position and the color frame when the color frame corresponding to the above-mentioned prior art is prioritized, and the editing start point shown in FIG. It is assumed that the input is made in S2. FIG. 6A shows the color frame and frame number of the master VTR 1, and the editing start point is a downward arrow, which is the same position as in FIG. 6B. FIG. 2B shows the slave VTR 2
And a frame number of the color frame signal CF in step S5.
Therefore, there is a problem that the editing start point is shifted from a desired editing start point shown by a solid line to an upward arrow shown by a dotted line, and accurate editing cannot be performed.

[0015]

SUMMARY OF THE INVENTION The present invention provides the following structure to solve the above-mentioned problems.

A composite video signal editing method for performing color frame conversion between a master VTR and a slave VTR, wherein the running of the magnetic tape of the slave VTR is synchronized with a reference color frame, and the master VTR is connected to the slave VTR. Phase-shifting, once converting the composite video signal output from the master VTR into a component signal, and supplying the composite video signal obtained by re-conversion while synchronizing with the reference color frame to the slave VTR. Characteristic composite video signal editing method.

A composite video signal editing apparatus for performing color frame conversion between a master VTR and a slave VTR, means for supplying a first command signal for synchronizing with a reference color frame to the slave VTR,
Means for providing a second command signal for adjusting the phase of the master VTR, means for temporarily converting a composite video signal output from the master VTR to a component signal, and means for synchronizing with the reference color frame. It is an object of the present invention to provide a composite video signal editing apparatus characterized by comprising means for supplying a third command signal for recording a composite video signal obtained by re-conversion from a predetermined start point.

[0018]

1 is a block diagram of one embodiment of an electronic editing system according to the present invention, FIG. 2 is a flowchart of one embodiment of an electronic editing system according to the present invention, and FIG. 3 is a concept for explaining an editing position. FIG. Hereinafter, embodiments will be described with reference to the drawings. 4 to 6 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 differs from FIG. 4 in that the master VT
The point is that the component conversion means 4 is newly inserted between R1 and the slave VTR2. The reproduced composite video signal 1a is supplied from the master VTR 1 to the decoder 41 in the component conversion means 4, where it is once converted into a component signal (for example, an RY signal and a BY signal) unrelated to the color frame. And the signal
2, the composite video signal 4a obtained by re-conversion while synchronizing with the color frame signal CF is supplied to the slave VTR2.

Therefore, even when the reproduced composite video signal 1a, which is the output signal of the master VTR 1, is not synchronized with the color frame signal CF, the composite video signal 4a supplied to the slave VTR 2 always has the color frame signal CF. It is a source of synchronization.

Now, a flow chart of the electronic editing system according to the present invention will be described with reference to FIG. In the figure, first, electronic editing starts from step S1. When step S1 ends, the process proceeds to step S2.

In step S2, the editing start point is input by operating the editing device CT, and the master VT is input before dubbing.
Preroll R1 and slave VTR2. At this point, neither VTR is synchronized with the color frame signal CF. When step S2 ends, the process proceeds to step S3.

In step S3, the slave VTR 2 receives the color frame signal CF based on the first command signal 3a supplied from the editing device CT, and synchronizes the running of the magnetic tape with the color frame signal CF. As a result, the running of the magnetic tape of the slave VTR 2 is as shown in FIG.
It matches the reference color frame of F. It should be noted that the downward arrow in FIG. 3B indicates the editing start point. When step S3 is completed, step S4
Proceed to.

In step S4, the master VTR 1 is adjusted in phase with respect to the slave VTR 2. That is, the master VT
The traveling position information 1b of the magnetic tape supplied from R1 and the traveling position information 2b of the magnetic tape supplied from the slave VTR 2 are compared by the editing device CT, and the traveling speed is varied so that the two coincide. The command signal 3b is supplied from the editing device CT to the master VTR1. If the running speeds of the two VTRs match after the completion of the phase adjustment, the editing start points of the two VTRs coincide at the same time, and the editing start points of the slave VTR 2 in FIG. As shown in FIG. 3C, the editing start point of the reproduced composite video signal 1a which is the output signal of the master VTR 1 matches. Since the composite video signal 4a, which is the output signal of the component conversion means 4 at this time, is synchronized with the color frame signal CF by the encoder 42, the color frame also matches as shown in FIG. It will be. When step S4 ends, the process proceeds to step S5.

In step S5, the master VTR 1 on the reproducing side locks to a reference signal (not shown). When step S5 ends, the process proceeds to step S6.

In step S6, editing is executed to dub the magnetic tape. That is, the third command signal from the editing device CT to start recording at a predetermined editing start point is output from the slave V
Supply to TR2. When dubbing is completed, the process proceeds to step S7, and editing is completed.

In this way, editing can be performed with color frames synchronized regardless of the editing start position.

In the embodiment described above, the component conversion means 4 may be used also as a time axis correction circuit, a frame synchronizer and the like.

[0029]

As described above, according to the configuration of the present invention,
In particular, since the composite video signal reproducing means is synchronized with the reference color frame before the phase adjustment and the composite video signal obtained by the reconversion is supplied to the composite video signal recording means, the synchronization of the color frames is maintained and the desired There is an effect that accurate editing can be performed from the editing start point.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of an electronic editing system according to the present invention.

FIG. 2 is a flowchart of an embodiment of the electronic editing system according to the present invention.

FIG. 3 is a conceptual diagram for explaining an editing position.

FIG. 4 is a block diagram of a conventional electronic editing system.

FIG. 5 is a flowchart of a conventional electronic editing system.

FIG. 6 is a conceptual diagram for explaining editing in which an editing position is prioritized.

FIG. 7 is a conceptual diagram for explaining editing with priority given to a color frame.

[Explanation of symbols]

 1 Master VTR (Composite Video Signal Reproducing Means) 2 Slave VTR (Composite Video Signal Recording Means) 3 Electronic Editing Device (Composite Video Signal Editing Device) 3a First Command Signal 3b Second Command Signal 3c Third Command Signal

Claims (2)

(57) [Claims] 1. A composite video signal editing method for performing color frame conversion between a master VTR and a slave VTR, the method comprising: synchronizing a magnetic tape of the slave VTR with a reference color frame; After adjusting the phase of the VTR and once converting the composite video signal output from the master VTR into a component signal,
A composite video signal editing method, characterized in that a composite video signal obtained by reconversion while synchronizing with the reference color frame is supplied to the slave VTR. 2. A composite video signal editing apparatus for performing color frame conversion between a master VTR and a slave VTR, comprising: means for supplying a first command signal for synchronizing with a reference color frame to the slave VTR; Means for supplying a second command signal to the VTR for adjusting the phase of the master VTR, means for temporarily converting a composite video signal output from the master VTR to a component signal, and synchronization with the reference color frame Recording a composite video signal obtained by re-converting from a predetermined start point
A composite video signal editing device, comprising: means for supplying a command signal of the following.