JPH0727712B2 - Video editing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention controls recording start and end of a recording side video tape recorder based on a recording start and end control signal of a reproducing side video tape recorder, The present invention relates to a video editing device that performs edit recording (dubbing recording).

[Conventional technology]

Among conventional rotary head type home video tape recorders (hereinafter referred to as VTRs), particularly high-end type recorders output control signals for recording start and end called camera remote signals. Some have editing functions to control editing records.

And the VTR with this kind of editing function is the VTR on the playback side,
Also, the same type of VTR or VTR without editing function
By using the VTR, a video editing apparatus for automatically controlling the recording start / end of the recording side VTR by the recording start / end control signal of the reproducing side to perform the edit recording is formed.

By the way, the control signal for starting and ending the recording rises to a high level (hereinafter referred to as H) at the start and rises to a low level (hereinafter referred to as L) at the end, for example, as shown in FIG. Consists of a descending signal.

On the other hand, the VTR on the recording side is controlled to the recording pause mode before the start of the edit recording, and the pause is released by the rise of the control signal of FIG. At the trailing edge of, the mode is switched to the stop mode and the recording is completed.

Then, the VT on the recording side is controlled by the recording start and end control signals.
Since the operation of R is controlled, the actual recording start and end timings of the VTR on the recording side are set to the rising and falling edges of the input control signal as shown in the recording mode signal of FIG. 5 (b), for example. From the operation delay time Ts, Te.

Therefore, the VTR on the playback side rewinds the tape to a tape position that is a certain value before the tape start position specified for editing, starts playback of the tape, and counts the tape playback control signal, for example, to set the operation setting. The start and end of the edited editing start and end, respectively, the timing of the tape playback position before and after the specified values of the tape end position, that is, the tape playback position set in consideration of the operation delay time Ts, Te of the VTR on the recording side. A control signal for starting and ending recording is output at a timing, and the tape reproduction signal for the section at the designated tape position for starting and ending editing is recorded in the VTR on the recording side.

[Problems to be solved by the invention]

By the way, the above-mentioned operation delay time Ts, Te differs depending on the manufacturer, the model, etc., and for example, with respect to the rising of the recording start / end signal in FIG. 6 (a), the operation delay times Ts, Te in FIG.
As shown in (d), when the operation delay time Ts of the VTR on the recording side becomes the specified value Ts ₀ , the value Ts ₁ shorter than the specified value Ts ₀ , and the longer value Ts _2, respectively, in the case of FIG. As shown by the shaded area in Fig. 7 (a), start editing the tape in the VTR section on the playback side.
Only the designated end tape positions Ps ₀ and Pe ₀ are dubbed and recorded. In the case of FIGS. 6 (c) and 6 (d), for example, as shown by the hatched portions in FIGS. 7 (b) and 7 (c), Excessive recording or insufficient recording occurs, making it impossible to perform accurate editing recording.

Then, when the edited and recorded tape is reproduced, if there is an extra image even in one frame (1/30 sec), the image becomes very noticeable and the editing effect is significantly reduced.

In addition, in order to correct the deviation between the specified time of the VTR start and end on the playback side and the operation delay time of the VTR start and end on the recording side, for example, the specified position of the start and end of editing is changed by the amount of deviation. It is conceivable to set the operation in anticipation, but in this case, for example, it is necessary to determine the desired start and end designated positions and then calculate the start and end designated positions to be actually set by correcting only the deviation amount. Yes, it requires very complicated operations and cannot be performed accurately.

It is also possible to variably correct the operation delay time of the VTR on the recording side in advance, but since the timing of continuous recording at the start of recording changes due to the correction, in practice,
It is difficult to correct the VTR operation delay time on the recording side.

The technical object of the present invention is to correct the above-mentioned deviation with a simple operation so that the edit recording can be performed in the section of the start and end tape designated positions.

[Means for solving problems]

The present invention has been made with the above points in mind,
From the video tape recorder on the playback side to the video tape recorder on the recording side, start recording at the timing of the tape playback position that is a specified value before the start / end tape editing position,
An end control signal is output, and the start and end of recording of the recording side video tape recorder are controlled based on the both control signals, and the operation delay time of the recording side video tape recorder from the timing of the both control signals. In a video editing apparatus that starts and ends editing and recording with a delay, the video tape recorder on the playback side starts the data at the tape playback position that is a specified value before and after the specified start and end tape positions. A storage unit arithmetically set as end point reference data, a correction counter unit in which one or both increase / decrease correction data of the both reference data are operated and set, and the increase / decrease correction data of each of the both reference data is added to the both reference data. This is opened when the calculated data is preset and the measured data at the tape playback position reaches the preset and end preset data. A video editing apparatus comprising: a measurement counter section that outputs each of start and end command pulses; and a control signal generation section that forms and outputs both control signals based on the both command pulses.

[Work]

Therefore, according to the video editing apparatus of the present invention, the output timing of the recording start and end control signals can be adjusted by adjusting the increase / decrease correction data of the start / end point reference data in the correction counter section. Only from the timing based on the specified value, the start and end timings of recording on the recording side video tape recorder are automatically corrected according to the operation delay time of the recording side video tape recorder with a simple operation, and start and end Editing and recording can be performed only on the section at the specified tape position.

〔Example〕

Next, the present invention will be described in detail with reference to FIGS. 1 to 4 showing one embodiment thereof.

FIG. 1 shows only the video tape recorder on the playback side, that is, the VTR on the playback side. In FIG. 1, (1) indicates the VTR on the playback side.
TR, (2) are system control or edit-dedicated microcomputers (hereinafter referred to as "microcomputers") provided in the VTR (1), and (3) is a storage unit for calculating and setting start and end point reference data. Based on the set edit start / end specified positions Ps ₀ , Pe ₀ , the data of the tape reproduction position before the specified start / end values Ps ₀ , Pe ₀ are calculated and set as the start / end reference data.

(4) is a correction counter unit in which increase / decrease correction data of one or both of the start and end point reference data of the storage unit (3) is operationally set, and (5) is a measurement counter unit. The data obtained by subtracting the increase / decrease correction data of the correction counter section (4) from the start / end point reference data of (3) are sequentially preset, and the tape which is input from the control head through the input terminal (6) is reproduced. The control signal is counted to form the measurement data of the tape reproduction position, and when the measurement data reaches the preset data of the start and end, the start and end command pulses are output.

(7) is a control signal generation unit for inputting start and end command pulses, and based on the input of both command pulses, control for start and end of recording that rises when the start command pulse is input and falls when the end command pulse is input. A signal is formed and the control signal is output to the VTR on the recording side.

The calculation of the start and end point reference data set in the storage unit (3) and the counting and discrimination of the counter unit (5) are actually performed by software processing of the microcomputer (2).

When editing is performed, first, the edit start and end tape designation positions are operated and set, and the edit point is set.

The operation setting of the start and end tape designation positions may be, for example, the desired start and end tape designation positions Ps determined in advance.
_This is done by setting the tape counter value of ₀ and Pe ₀ .

Next, the increase / decrease correction data is operated and set in the counter section (4), and after the setting, editing is started.

Note that the operation setting of the increase / decrease correction data may be performed by, for example, a preliminary edit record of the start and end specified values Ts ₀ , Te _0.
It is performed by discriminating a deviation between the timing based on the VTR and the timing based on the actual operation delay time Ts, Te of the VTR on the reproducing side.

By the way, when the start and end tape designated positions Ps ₀ and Pe ₀ are set, the tape playback positions before the preset designated positions Ps ₀ and Pe ₀ respectively by the specified values Ts ₀ and Te ₀ are calculated,
The both tape reproduction positions are set in the storage unit (3) as start and end point reference data.

Then, the tape reproduction position of the start and end reference data set in the storage unit (3) is the pulse number X of the reproduction control signal,
Y, and at this time, the tape playback start position is the specified position P
Assuming that the playback control signal is set 8 seconds before s ₀ , that is, 240 pulses before, and the start / end increase / decrease correction data is set to the pulse number x, y of the playback control signal, as shown in FIG. When the start and end reference data are set, the VTR (1) is automatically controlled to rewind, and at this time, the rewind amount is measured using the counter section (5) and the counter section ( The tape is rewound until the count value Z of the pulse number of the reproduction control signal of 5) becomes X-240.

Furthermore, when the tape is rewound by the specified value, VTR (1)
Is controlled to be reproduced and the editing is started. At this time, the counter section (5) subtracts and corrects the increase / decrease correction data x at the start of the counter (4) from the start point reference data X of the storage section (3). x is immediately preset.

Furthermore, when the count value Z of the counter section (5) reaches Z = X−x, a start command pulse is output from the counter section (5) to the generating section (7), and the generating section (7) outputs the recording side. VTR
A recording start control signal is output to the recording side VTR, the recording side VTR shifts from recording pause to recording, and recording of the tape reproduction signal of VTR (1) is started.

When the recording of the VTR on the recording side is started, the counter unit (5) subtracts the correction data y of the end of the counter (4) from the end point reference data Y of the storage unit (3) and corrects the data Y.
-Y immediately resets.

Then, when the count value Z of the counter section (5) reaches Z = Y−y, the counter section (5) outputs an end command pulse to the generating section (7), and the generating section (7) outputs to the recording side. VTR
A recording end control signal is output to the recording side VTR, the recording side VTR shifts from recording to stop, recording of the tape reproduction signal of VTR (1) ends, and editing recording ends.

By the way, the timing at which the recording start and end control signals are output becomes the respective counting timings of X-x and Y-y, and the actual recording start and end of the VTR on the recording side based on the recording start and end control signals. Operation delay time is also X−x, Y
-Y Match each counting timing.

Therefore, based on the recording start and end control signals output from the VTR (1), the VTR on the recording side has the count value Z of the counter section (5) at the start and end tape editing positions Ps.
_0, Pe ₀ to start recording when it reaches, finished, start, only the section end the deep specified position Ps _0, Pe ₀ is edited recorded.

Now, the start and end tape designation positions Ps ₀ and Pe ₀ are set to 0,2400 counts respectively, and the start and end specified values Ts
Assuming that ₀ and Te ₀ are both set to a count number of 60 (20 sec) and correction data x and y are both set to a count number of 30 (1 sec), the tape of VTR (1) is set as shown in FIG. Starts the reproduction from the point S of -240 count, and the control signal of the start and end is the point Ps _{0 of the} specified timing at which the recording start and end control signals before the specified values Ts ₀ and Te ₀ are output. ′, Pe ₀ ′ is delayed by 30 counts at each point Ps, Pe. At this time, the recording side VTR start and end operation delay times Ts, Te are both 30 counts (1se
Since it is c), the actual recording is the recording section of 0 count to 2000 count, that is, the portion from the start tape designation position Ps _{0 to the} end tape designation position Pe ₀ .

That is, the start tape designation position Ps ₀ shown in FIG.
There is set, this time, the prescribed value if the start reference data based on Ts _0, FIG designated position Ps ₀ as shown in (b)
Based on the start increase / decrease correction data, the recording start / end control signal that rises 2 seconds before is corrected to rise 1 second before the specified position Ps ₀ as shown in FIG. On the tape of the VTR on the side, as shown in FIG.
Recording starts from the specified position Ps ₀ .

Furthermore, the end position of recording is corrected in the same way as the start position based on the increase / decrease correction data, and as described above, the specified position Ps
Only the section of ₀ and Pe ₀ is edited and recorded.

Therefore, based on the start / end increase / decrease correction data,
The timing of the recording start and end control signals is corrected from the specified timing based on the specified start and end values Ts ₀ , Te ₀ according to the operation delay time Ts, Te of the VTR on the recording side. Recording starts and ends automatically,
Corrected to the playback timing of the specified end position Ps ₀ , Pe ₀ ,
In this case, a complicated process such as the case where the start and end tape designated positions are corrected by operation, for example, the start after the actual start and end tape designated positions Ps ₀ and Pe ₀ are determined and the correction amount is corrected, The process of obtaining and setting the end tape start position is not necessary, and the edit recording can be performed only in the section of the start and end tape designation positions Ps ₀ and Pe ₀ accurately by a simple operation.

Also, once setting the start / end increase / decrease correction data,
It is not necessary to set the increase / decrease correction data at the time of subsequent edit recording, and there is an advantage that the operability is remarkably improved.

Further, since the operation is performed by the software processing of the microcomputer (2), for example, only the software of the conventional VTR system control for the reproducing side or the exclusive editing microcomputer is changed or the software is changed and the counter (4) is used. Can be formed easily and inexpensively.

In addition, in the above embodiment, both the start and the end are corrected,
Usually, when the edited and recorded tape is reproduced, the extra recording at the start portion is particularly conspicuous. Therefore, for example, only the increase / decrease correction data of the starting point reference data may be set and the start only may be corrected.

〔The invention's effect〕

As described above, according to the video editing apparatus of the present invention,
By operating and setting the increase / decrease correction data of one or both of the start and end reference data, the timing of the control signal for recording start and end is corrected by an amount corresponding to the correction data,
The actual recording start / end timing of the video tape recorder on the recording side is automatically corrected to the playback timing of the edit start / end tape specified position, and the correct start and end tapes can be made with a simple operation. Editing and recording can be performed, and operability is significantly improved.

[Brief description of drawings]

1 to 4 show an embodiment of a video editing apparatus of the present invention. FIG. 1 is a block diagram of a video tape recorder on the reproducing side, and FIGS. 2 and 3 are flow charts for explaining the operation. Schematic diagrams, FIGS. 4A to 4D are timing charts for explaining the operation, and FIGS. 5A and 5B are timing charts for explaining edit recording of a general video editing apparatus.
FIGS. 6A to 6D and FIGS. 7A to 7C are timing charts for explaining the deviation of the operation delay time and the deviation of the recording position of the video tape recorder on the recording side. (1) …… VTR on playback side, (2) …… Microcomputer, (3)
... storage section, (4) ... correction counter section, (5) ... measurement counter section, (7) ... control signal generating section.

Claims (1)

[Claims] 1. A recording start / end control signal is output from a video tape recorder on the reproducing side to a video tape recorder on the recording side at a timing of a tape reproducing position which is a specified value before the start / end tape specified position of editing. Controlling the start and end of recording of the video tape recorder on the recording side based on the both control signals, and starting the edit recording with a delay of the operation delay time of the video tape recorder on the recording side from the timing of the both control signals. , In the ending video editing apparatus, the data of the tape reproducing position which is before the specified start and end tapes by the specified value of the start and end is calculated and set as the start and end reference data in the video tape recorder on the reproducing side. A storage unit, a correction counter unit in which increase / decrease correction data for one or both of the reference data is set, and Data obtained by arithmetically correcting the increase / decrease correction data of each of the reference data are preset to the quasi-data, and start and end command pulses are output when the measurement data at the tape reproduction position reaches the preset and end preset data. A video editing apparatus comprising: a measurement counter section; and a control signal generation section that forms and outputs both control signals based on both command pulses.