JP2521921B2 - Video editing control system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a video editing apparatus that controls two video tape recorders using a bidirectional data bus line to edit a video tape.

[Conventional technology]

Conventionally, as a so-called helical scan type video tape recorder that records and reproduces a video tape signal using a rotary magnetic head device, it is controlled by a control track provided along the tape running direction on the magnetic tape, separately from the video track. A so-called CTL type device that records a (CTL) signal and thereby performs tracking control using the above control signal at the time of reproducing operation, and a pilot (ATF) signal of four types of frequencies for tracking control. There is provided a so-called AFT system device in which the signal is sequentially frequency-multiplexed with a video signal and stored in a video track, and tracking control is performed by using the pilot signal during a reproducing operation.

In addition, generally, in a video tape recorder, so-called joint shooting is performed by using a recording pause operation for temporarily interrupting the recording operation. Then, in the joint shooting operation using the recording pause operation, if the tracks to be newly recorded are misaligned with respect to the recording tracks or the control signal becomes discontinuous, the tracking servo is deviated during reproduction and the reproduced image is displayed. Since it will be disturbed, by controlling so that it will be in the pause state at the position where it is rewound by a sufficient amount to start up the servo system when releasing the pause, the recording pattern will be continuous and the phase of the control signal will be correct during the above-mentioned joint shooting operation. I try to line up.

A video editing apparatus has been conventionally provided which edits a recorded tape by using the continuous shooting function of the video tape recorder.

Conventionally, in a video editing apparatus using a CTL type video tape recorder, the tape position is managed by counting the CTL signals recorded on the control track, and a predetermined CT is used during the recording pause operation of the recording side video tape recorder.
By rewinding the tape for L minutes and making it stand by in the playback pause state, the editing start operation unpauses the video tape recorder on the recording side and prerolls the video tape recorder on the playback (master) side by a predetermined CTL amount. , Using that position as the editing point, the video tape recorder on the recording side is switched to the recording operation and the video tape recorder on the reproducing side is switched to the reproducing operation, and the video tape recorder on the recording side is connected by overwriting for 2 to 3 CTL. Editing control is performed such that shooting is performed.

Further, in a video editing apparatus using an ATF video tape recorder without a CTL signal, the tape position is managed according to time, and edit control is performed such that continuous recording is performed by overwriting for about 0.8 seconds.

Further, conventionally, there has been a control system that performs bidirectional communication of serial data between two devices such as a video camera and a video tape recorder or between three devices through a bidirectional data bus line to perform interlocking control. Proposed. For example, in the case of bidirectional communication of serial data between a master device and a slave device through a single transmission line, the applicant of the present application has a communication section composed of a plurality of communications that do not overlap each other in time and a pause in which communication is not performed. While the section is cyclically repeated, each of the plurality of communication areas is either transmission or reception communication when viewed from the master device side, but the start bit of the communication area is from the master device. The bidirectional serial data communication method was proposed in which the communication section and the communication section have a fixed length, and processing other than the communication can be performed in this pause section. (See Japanese Patent Application No. 59-263537).

[Problems to be solved by the invention]

By the way, as described above, in the video editing apparatus dedicated to various systems such as the CTL system and the ATF system, the editing points are uniformly determined, and when the video tape recorders of different systems are used, the editing points are shifted, If video tape recorders of different systems are used on the master side and the recording side, the errors of the editing points on the master side and the reproducing side are added.

Therefore, in view of the above-mentioned conventional problems, an object of the present invention is to provide a video editing apparatus capable of performing highly accurate video editing by using a plurality of video tape recorders having different control sequences. is there.

[Means for solving problems]

In order to solve the above-mentioned problems, a video editing apparatus according to the present invention includes a video editing control apparatus, a video editing control apparatus, a video editing control apparatus, and a video editing control apparatus via bidirectional data bus lines. And a slave-side video recording device connected to each other, and the master-side video reproducing device transmits the category code indicating the model of the device through the first bidirectional data bus line in a time division manner. In addition, the video editing control device includes control means for receiving an edit control signal time-divisionally transmitted via the first bidirectional data bus line and performing a reproduction operation according to the edit control signal.
The slave-side video recording device transmits a category code indicating the model of the device via the second bidirectional data bus line in a time division manner, and the video editing control device transmits the second bidirectional data bus line. The video editing control device receives a category code transmitted by the master-side video reproduction device. The video editing control device receives a category code transmitted by the master-side video reproduction device. Then, at the timing corresponding to the control sequence, the operation control signal is transmitted to the master side video reproducing apparatus, and at the same time, the slave side video recording apparatus receives the category code and receives the category code at the timing corresponding to the control sequence. The operation control signal to the master video recording device, Characterized in that it comprises control means for controlling the operation of the serial slave video recorder.

[Action]

In the video editing apparatus according to the present invention, the master-side video reproducing apparatus and the slave-side video recording apparatus, which are respectively connected to the video editing control apparatus via the bidirectional data bus line, time-divisionally transmit category codes indicating respective models. . Then, the video editing control device controls the operations of the master-side video reproducing device and the slave-side video recording device to perform edit control, based on the category code transmitted by the master-side video reproducing device. The model of the video reproducing device is determined, and the operation control signal is transmitted to the master side video reproducing device at the timing corresponding to the control sequence of the model, and the above-mentioned is based on the category code transmitted by the slave side video recording device. The model of the slave side video recording device is determined, and an operation control signal is transmitted to the slave side video recording device at a timing corresponding to the control sequence of the model.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In the embodiment shown in the block diagram of FIG. 1, the master side video tape recorder (VTR) 10 is a recording / reproducing block 1 by counting CTL signals with an instrument model.
The system controller 12 for controlling the operation of 1 can manage the tape position, and a video signal as a reproduction output for editing reproduced in the recording / reproduction block 11 from a recorded magnetic tape (not shown). Output an audio signal. The system controller 12 of the master side VTR 10 is a bidirectional data bus line via an interface circuit 13 that performs serial / parallel conversion of data.
It is connected to BM. In addition, the slave video tape recorder (VTR) 20 is a CTL system or AFT for general household use.
A video tape recorder adopting various control methods such as a method, and the operation of the recording / reproducing block 21 according to the method is controlled by the system controller 22. The system controller 22 of the slave VTR 20 is connected to the bidirectional data bus line BS via the interface circuit 23 that performs serial / parallel conversion of data. Then, the bidirectional data buses BM and BS
Is connected to a control microcomputer (hereinafter, referred to as a microcomputer) 32 via an interface circuit 31 of the video editing control device 30.

In this embodiment, the master-side VTR 10 and the slave-side VTR 20 have a function of allowing each system controller 12, 12 to time-divisionally transmit a category code indicating each model via the bidirectional data bus lines BM, BS. At the same time, the video edit control device 30 receives an edit control signal which is time-divisionally transmitted via the bidirectional data bus lines BM and BS at each of the system controllers 12 and 22 and responds to the edit control signal. Each recording / playback block 1
The operation control of 1,21 is performed as follows.

That is, in this embodiment, the master side VTR1
When the master control signal transmitted from the video editing control device 30 is received and the content indicates the editing point MP, 0 indicates, for example, 5 seconds (150CTL) from the tape position as shown in FIG. ) Only rewinds the tape, and becomes the playback pause state at the position MA. When a master control signal for instructing the start of editing is given from the video editing control device 30 in this playback pause state, a pre-roll operation is performed for 5 seconds to switch the recording / playback block 11 from the editing point MP to the playback operation. The reproduced video signal and reproduced audio signal are supplied to the recording / reproducing block 21 of the slave VTR 20.

In addition, the video editing control device 30 is
Receives the category code that is transmitted in a time-division manner from the two-way data bus lines BM and BS, and determines each model of the master VTR10 and slave VTR20 based on the category code received by the control microcomputer 32. Then, a master control signal and a slave control signal having a timing according to a predetermined control sequence set for each model are formed as an edit control signal, and each VTR 10, Send to 20.

When the slave VTR 20 is, for example, an ATF video tape recorder, when a slave control signal for instructing a recording pause at the timing of an editing point SP for performing splicing shooting editing is provided by the video editing control device 30, The tape is rewound for 2 seconds from the editing point SP, and the system controller 22 controls the operation of the recording / reproducing block 21 so as to be in the reproduction pause state at the tape position SA.

Then, the video editing control device 30 transmits a master control signal instructing the VTR 10 on the master side to start editing and then, after 3.8 seconds, transmits a slave control signal to instruct the VTR 20 on the slave side to start editing. Above slave side
The system controller 22 of the VTR20 releases the pause operation immediately after receiving the slave control signal for instructing the editing start, performs the playback operation for 1.2 seconds to start up the servo system, and then edits the MP of the VTR10 on the master side.
The joint shooting control corresponding to the ATF control sequence for starting the recording operation at the timing t ₀ that coincides with By the joint photographing control, as shown in FIG. 2, the desired editing work can be performed by overwriting for 0.8 seconds from the editing point MP of the master side VTR 10.

When the slave VTR 20 is a CTL type video tape recorder, a slave control signal for instructing a recording pause at the timing of the edit point SP for performing joint shot editing is given by the video edit control device 30. As shown in FIG. 3, the CTL type slave VTR 20 rewinds the tape for 21 CTLs from the editing point SP, and the system controller 22 performs the recording / reproducing so that the tape is in the reproduction pause state at the tape position. The operation of the block 21 is controlled. Then, the video editing control device 30 transmits a master control signal for instructing the master side VTR 10 to start editing, and then transmits a slave control signal for instructing the slave side VTR 20 to start editing after a lapse of time 131CTL. Slave VTR of the above CTL method
20 is a connection corresponding to the control sequence of the CTL method that switches to the recording operation after canceling the pause operation and performing the playback operation for 19 CTLs to start the servo system when receiving the slave control signal instructing the editing start. By performing shooting control by the system controller 22, an edit operation having an overwrite period of 2CTL from the edit point MP of the master side VTR 10 is performed.

〔The invention's effect〕

As described above, in the video editing apparatus according to the present invention, the master side video reproducing apparatus and the slave side video recording apparatus, which are respectively connected to the video editing control apparatus via the bidirectional data bus line, are category codes indicating respective models. Is transmitted by time division, the respective models of the master side video reproducing device and the slave side video recording device can be discriminated by the video editing control device based on each category code. That is, the video editing control device determines the model of the master side video reproducing device based on the category code transmitted by the master side video reproducing device, and the master side video at a timing corresponding to the control sequence of the model. While transmitting an operation control signal to the playback device, the slave side video recording device determines the model of the slave side video recording device based on the category code transmitted by the slave side video recording device, and the slave device operates at a timing corresponding to the control sequence of the model. By transmitting the operation control signal to the side video recording device, the operations of the master side video reproducing device and the slave side video recording device can be controlled to perform editing control.

Therefore, the video editing apparatus according to the present invention can perform highly accurate video editing by using a plurality of video tape recorders having different control sequences.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video editing apparatus according to the present invention, and FIG. 2 shows an editing control operation when an ATF video tape recorder is used as a slave VTR in the above embodiment. It is a timing chart,
FIG. 3 is a timing chart showing the editing control operation when the CTL type video tape recorder is also used. 10,20 …… VTR 11,21 …… Record / playback block 12,22 …… System controller 13,23,31 …… Interface circuit 30 …… Video editing controller 32 …… Control microcomputer

Claims (1)

(57) [Claims] 1. A video editing control device, and a master-side video reproducing device and a slave-side video recording device, which are connected to the video editing control device via bidirectional data bus lines, respectively. Editing in which the category code indicating the model of the device is time-divisionally transmitted via the first bidirectional data bus line, and the video editing control device is time-divisionally transmitted via the first bidirectional data bus line. The slave side video recording device is provided with a control means for receiving a control signal and performing a reproducing operation according to the edit control signal, and the slave side video recording device transmits a category code indicating a model of the device via a second bidirectional data bus line. And time-division transmission by the video editing control device via the second bidirectional data bus line. The video editing control device includes a control means for receiving a control signal and performing a reproducing operation according to the editing control signal, and the video editing control device receives the category code transmitted by the master side video reproducing device and corresponds to the control sequence. At the same time, the operation control signal is transmitted to the master side video reproducing apparatus, and the category code transmitted from the slave side video recording apparatus is received to control the operation to the slave side video recording apparatus at the timing corresponding to the control sequence. Send a signal,
A video editing apparatus comprising a control means for controlling the operation of the master side video reproducing apparatus and the slave side video recording apparatus.