JPH0814973B2 - Editing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A Field of Industrial Application The present invention relates to an editing apparatus, and is suitable for application to, for example, an editing apparatus of a video tape recorder (VTR).

B. SUMMARY OF THE INVENTION The present invention is an editing apparatus for switching and controlling signals from a plurality of signal sources in a predetermined transition mode. It is intended to further simplify the editing work by determining the editing start time point at which the operation is started.

C Conventional Technology Conventionally, in a VTR editing system, in addition to simply switching playback video signals obtained from a plurality of VTRs,
For example, a function of switching while performing an operation of a predetermined transition mode such as dissolve (these are called cross fade) and wipe is added.

That is, the switcher of the editing system receives the playback video signal output from the first and second VTRs that have been phased, and outputs the output signal from the first VTR at the timing of the trigger signal output from the editing device. Switch to the playback video signal of the second VTR. At this time, for example, when the switch is set to the cross fade mode in advance, the playback video signal output from the first VTR is started to fade out at the timing of the trigger signal and the second VTR is started.
Start the fade-in of the playback video signal output from.

Therefore, after setting the predetermined transition mode and the transition time required for the operation of the transition mode in the switcher, by instructing the timing of the trigger signal indicating the transition start time, that is, the edit start time, the first start time from the edit start time
Gradually starts transitioning from the VTR playback video signal of the second VTR playback video signal to the second VTR after a predetermined transition time elapses.
It is possible to obtain an output signal for switching to the playback video signal of the VTR.

D The problem to be solved by the invention is that the editing point of the crossfade that the operator can intuitively grasp in the series of editing operations is that the playback video signals of the first and second VTRs have almost the same level. It is an intermediate time point of the transition time, and it is extremely difficult to grasp the edit start time point of the transition start when the signal gradually changes.

For this reason, conventionally, when performing editing work in cross-fade mode, the operator's sensational edit point is used as a reference,
The operation is performed in consideration of the time lag between the sensuous editing point and the time when the editing is actually started by the editing apparatus.

That is, the operator determines the sensuous edit point and the transition time, and then calculates the time point that is half the transition time back from the sensuous edit point. As instructed.

Therefore, when repeating the editing work in such a transition mode, the operator must repeat the extremely troublesome and error-prone work of finding the editing start time of the editing device from the sensuous editing point each time. There was a problem.

The present invention has been made in consideration of the above points, and an object thereof is to propose an editing apparatus capable of simplifying such a troublesome work.

E Means for Solving the Problems In order to solve the problems, in the present invention, the signals VD1 and VD from the plurality of signal sources 4 and 5 via the switcher 7 are used.
In the editing device 3 in which the switching control of D2 is performed in the predetermined transition mode, at the intermediate point t2 of the transition time T1 of the transition mode.
The input circuits 2 and 16 for designating as the edit point, and the operation circuits 17 and 18 for calculating the edit start time t1 for starting the operation of the transition mode based on the edit point. Accordingly, the switching control of the switch 7 is started.

F action Almost halfway point t2 of transition time T1 required for operation in transition mode
As the edit point, and based on this, edit start time t1
By determining, it is possible to simplify the work of the conventional operator who calculates the edit start time from the edit point and inputs it.

G Embodiment An embodiment in which the present invention is applied to an editing apparatus will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an editing system as a whole, and when an operator operates a keyboard 2, the editing device 3 controls the reproduction video signals VD1 and VD2 of the first and second VTRs 4 and 5 and the reproduction audio signal. The signals AD1 and AD2 are selected to perform so-called AB roll editing for recording on the master tape of the third VTR6.

The first and second VTRs 4 and 5 are controlled by the control signals DC1 and DC2 output from the editing device 3 to output the corresponding playback video signals VD1 and VD2 to the switcher 7,
The reproduction audio signals AD1 and AD2 are output to the mixer 8.

Further, VTRs 4 and 5 are time code signals DT representing the tape position information recorded on the original tape, respectively.
1 and DT2 are output to the editing device 3.

The switcher 7 changes the gain on the basis of the control signals DCT1 and DCT2 to perform the fade-out and fade-in operations on the fade amplifier circuits 9 and 10 to reproduce the reproduced video signals VD1 and VD.
Upon receiving D2, the output signals of the fade amplifier circuits 9 and 10 are output as the output signal VD0 via the adder circuit 11.

Further, the switch 7 has a control circuit 12 therein, and based on the control signal DC3 output from the editing device 3, the control signal D
The fade amplifier circuits 9 and 10 are controlled by outputting CT1 and DCT2. For example, by the control signal DC3, the switch 7 is set in advance to the cross fade mode of the transition time T1 in which the playback video signal VD1 is faded out and the playback video signal VD2 is faded in. After that, when the control signal DC3 is input at time t1 in FIG. 2, the control circuit 12 outputs the control signals DCT1 and DCT2 to gradually decrease the gain of the fade amplifier circuit 9 and the gain of the fade amplifier circuit 10. Gradually increase.

As a result, the output signal VD0 of the switch 7 gradually lowers the level of the reproduced video signal VD1 output before the time point t1 and gradually raises the level of the reproduced video signal VD2.

Thus, after the time t2 (half the transition time T1) when the levels of the reproduced video signals VD1 and VD2 become equal,
At the end time point t3 of the period T1 from the time point t1, the signal level of the reproduced video signal VD1 becomes 0 level, and the operation in the cross fade mode is completed.

The mixer 8 receives the reproduction audio signals AD1 and AD2, and outputs the output audio signal AD0 based on the control signal DC4 output from the editing device 3 from the reproduction audio signals AD1 to AD.
Switch to 2 or vice versa.

The VTR6 is controlled by the control signal DC5 output from the editing device 3, records the output signal VD0 and the output audio signal AD0 on the master tape, and branches the signals VD0 and AD0 to the video monitor 13 and the audio monitor 14. Then, the master tape time code signal DT3 is output to the editing device 3.

The editing device 3 has a micro-computer configuration having an interface circuit 16, a memory 18 and a central processing unit (CPU) 17 therein, and outputs control signals DC1 to DC5 in response to a key operation of the keyboard 2 to output VTR4 to VTR6. And the editing system 1 as a whole.

Further, the editing device 3 uses the time code signal DT1 of VTR4-6.
.. DT3, the operation information of the editing system 1 is output to the display device 15 and the display device 15 is display-controlled.

In addition to the above configuration, in the present invention, the editing device 3
When editing the original tape in the transition mode, the CPU 17 executes the processing program shown in FIG.

That is, when editing in the cross fade mode, the work is started in step SP1, and in step SP2, the VT at the sensuous edit point determined by the operator is set.
The time code of the original tape of R4 and 5 (position information of the original tape of VTR4 and 5 at time t2 shown in FIG. 2) is taken in.

Incidentally, in the capturing operation, for example, by turning on the mark button provided on the keyboard 2 during reproduction of the original tape, the time code of the time code signal CT1 or CT2 of the original tape at the time of this ON operation is taken in. It is done by things.

Next, in step SP3, waiting for keyboard input, the editing operation mode (in this case, the cross-fade mode, the playback video signal VD1 of VTR4 becomes fade-out, the playback video signal VTR5 and VD2 becomes fade-in operation mode) and The transition time T1 of the operation mode is taken in, the control signal DC3 is output, and the switch 7 is set to the operation mode of the transition time.

Then, move to step SP4 and calculate the time code of VTR4 and VTR5 at the time of tracing back 1/2 hour T1 / 2 of the transition time T1 from the time code of VTR4 and 5 fetched in step SP2, respectively. Out point of VTR4 and
It is stored as the time code of the VTR5 IN point.

After that, VTR4 and VTR5 are pre-rolled so that the time code of the out point and the time code of the in point are output at the same timing from VTR4 and 5, and then the playback video signal VD1 of VTR4 is V
It is recorded at a predetermined position on the TR6 master tape.

At this time, the CPU 17 shifts to step SP5 to monitor the time code signals CT1 and CT2 of VTR4 and 5, and when the time code of the time code signal CT1 matches the time code of the out point of VTR4, the control signal DC3 is sent to the switch 7. Output and start fade-out of VTR4 playback video signal VD1.

Similarly, when the time code of the time code signal CT2 matches the IN point of VTR5, the CPU 17 outputs the control signal DC3 and VT
After starting the fade-in of the playback video signal VD2 of R5,
The processing moves to step SP6 and the processing program is ended.

Thus, VTR6 outputs the playback video signal VD1 of VTR4 until time t1 in FIG. 2 and starts crossfading from the edit start time t1 and the time after t2 of the sensuous edit point.
At t3, the output signal VD0 that switches to the reproduced video signal VD2 of VTR5 comes to be output.

In the above configuration, when performing the editing operation in the cross fade mode, if the edit mode and the transition time are input after the sensory edit points of the original tapes of the VTRs 4 and 5 are input, the CPU 17 of the editing device 3 Is the actual editing start time, that is, VTR4 and 5 at step SP4 in FIG.
The time code of the in point and the out point of is calculated.

Then, the editing device 3 uses the switch 7 and the mixer 8 based on the time code of the in point and the out point of step SP3.
To control the output signal VD0 and the output audio signal AD0 of the switcher 7 and the mixer 8 which are input to the VTR6.

According to the above configuration, since the editing can be started from the actual editing start point based on the editing point that the operator intuitively grasps, it is possible to omit the conventional troublesome calculation work for obtaining the editing start point. Therefore, the editing work as a whole can be simplified, and as a result, erroneous operations can be effectively prevented.

In the above-described embodiment, the case of the editing operation in the cross fade mode has been described, but the present invention is not limited to this and can be widely applied to a transition mode such as wipe.

Further, it can be widely applied not only to VTR editing, but also to, for example, an editing apparatus that switches a video signal obtained from the VTR and a video camera, and further an editing apparatus that switches, for example, an audio signal instead of the video signal.

H Effect of the Invention As described above, according to the present invention, it is possible to omit the calculation work for obtaining the edit start time from the edit point, which is conventionally performed, so that the edit work performed by the operator can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an editing apparatus according to the present invention, and FIGS. 2 and 3 are a signal waveform diagram and a flow chart for explaining the operation thereof. 1 ... Editing system, 2 ... Keyboard, 3 ... Editing device, 4, 5, 6 ... VTR, 7 ... Switcher, 9, 10 ...
… Fade amplification circuit, 17 …… CPU.

Claims (1)

[Claims] 1. An editing apparatus in which signals from a plurality of signal sources are switch-controlled in a predetermined transition mode through a switch, and an input circuit for designating an almost midpoint of the transition time of the transition mode as an editing point. And an arithmetic circuit for calculating an edit start time point for starting the operation of the transition mode based on the editing point, and the switching control of the switch is started according to the output from the arithmetic circuit. Characteristic editing device.