JPH0524573B2 - - Google Patents

Description

[Detailed description of the invention] The invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art (Figures 7 to 10) D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example G. ₁ Editing system (Fig. 2, Fig. 3) G ₂ Explanation of editing operation (Fig. 1, Fig. 4, Fig. 5) G ₃ Explanation of other examples (Fig. 6) H Effects of the invention A Industrial effects Field of Application This invention can be used, for example, by using editing controls.
The present invention relates to technology for controlling video signal reproducing devices and recording devices using communication, such as when controlling editing work in a VTR.

B. Summary of the Invention This invention transmits control data to a video signal reproducing device and a video signal recording device to which the reproduced video signal is supplied and recorded, respectively, to control the video signal reproducing device and the video signal recording device in a predetermined manner. In the method for controlling the video signal recording device to the state, the video signal recording device is provided with a time counting means, and the controller sends a playback start command to the video signal playback device and the video signal recording device to put each into a playback state,
The controller sends control data for each field to the time counting means of the video signal recording device, indicating how many fields of time there are from a predetermined time position before the target time to the target time, and the time counting means reads the control data. When the counting time of the time counting means reaches a preset time value, the target time arrives and the recording of the video signal recording device starts or ends. This system not only improves the system but also enables real-time control.

C. Conventional technology For example, when trying to edit something recorded on a VTR, the editing system consists of a playback VTR 1 that plays back the tape on which the image information to be edited is recorded, and a raw tape loaded as shown in Figure 7. It is composed of a recording VTR 2 and an editing controller 3.

Played video signal VI from playback VTR1
and audio signal AU are supplied to the recording VTR 2 via control cables 4 and 5, respectively.

In addition, control data from controller 3 is transmitted to the VTR via connection cables 6 and 7, respectively.
1 and 2.

Conventionally, the connecting cables 6 and 7 are 40 to 60 pin round cables, and the controller 3 controls the two VTRs 1 and 2 in a method similar to parallel control. In other words, in this case, it functions similarly to a controller.

Editing (for example, assemble mode) is performed, for example, as follows.

That is, FIG. 8 is a diagram for explaining this.First, put the VTR1 into playback mode, and while watching the playback screen, select the starting point of the image part to be recorded on the VTR2.
Determine INP and end point OUP, and store these two points in the controller 3. These points INP and OUP are
It can be determined as the value of the tape counter of VTR1.

Next, rewind VTR1 and stop it slightly before the starting point INP. Then, set controller 3 to edit mode and start editing operation.
When the VTR 1 returns to the playback state, the VTR 2 also returns to the playback state. However, at this time, the drum phase servos of VTRs 1 and 2 are arranged so that the rotational phase of the rotary head is phase-locked to the vertical synchronization signal of the reproduced video signal from VTR 1. For this reason,
Even though it is a raw tape, a control signal is recorded at the end of the tape in the width direction for a certain amount of time at the beginning of the tape.

Then, when the starting point INP is reached, the VTR 2 enters the recording mode, and the reproduction signal of the VTR 1 is recorded in the VTR 2 until the ending point OUP, and when the ending point OUP is reached, it stops and the editing operation ends.

However, such a system using multiple cables has the disadvantage that the hardware configuration becomes complicated and reliability may decrease.

Therefore, as a control system that does not have such drawbacks, a method using a communication method for data communication between the VTRs 1 and 2 and the controller 3 has been considered.

In this type of communication system, as a method that can reliably bring the controlled device into the state according to the command even if a communication error occurs, command data etc. are sent periodically in synchronization with the vertical synchronization signal of the video signal. The applicant had previously proposed a communication method (see Japanese Patent Application No. 1983-270042, filed on December 21, 1982).

In other words, in this communication method, each device has a microcomputer (hereinafter referred to as microcomputer) for communication, and performs asynchronous serial data transmission, and the communication data has a structure as shown in Figure 9. The start bit is generated only from one device, such as the controller 3, as a master device, so that bidirectional communication can be performed using a single line. Of course, the data communication may be performed using two separate communication lines, one for the transmission line and one for the reception line.

In this case, between VTR1 and controller 3,
If a communication line is provided between the VTR 2 and the controller 3, the data structure will be as shown in Figure 9.
When connecting with a real communication line, the data structure may be such that the controller 3 outputs a start bit four times for each field, and the transmission period and reception period for each VTR 1 and 2 are determined in advance.

In this case, when transmitting command data from the controller 3 to the VTRs 1 and 2, for example, the same command data is transmitted four times in a row to prevent communication errors and data decoding errors, and the receiving side When the data matches, the microcomputer decodes and executes the command.

Therefore, if this communication method is directly applied to the above editing system, the result will be as shown in FIG. 10.

In other words, start the VTR from the position before the starting point INP.
Both 1 and 2 are brought into the reproducing state, and the drum servo is locked using the same reference signal. Then, when the starting point INP is reached, controller 3 sends the VTR
2, a command to set it to the recording state is sent four times (four feeds) consecutively. The VTR 2 receives this and changes from playback mode to record mode when 2 to 4 matches are found. Next, when the end point OUP is reached, the controller 3 sends a command to the VTR 2 four times in succession (four fields) to set it in the playback state. VTR2 receives this and 2~
When a match is found four times, the mode shifts from the recording mode to the playback mode.

At this time, a mode signal is sent from the VTR 2 side to the controller 3 side, confirming that the mode has changed. Command 2 due to communication error etc.
If the VTR 2 cannot match up to 4 times, this mode signal indicates that the mode has not changed, and in that case, the controller 3
The recording or playback command is issued again four times in a row.
Sent to VTR2.

D. Problems to be Solved by the Invention Although it is possible to control editing operations using the communication method as described above, editing operations require accuracy on a field-by-field or frame-by-frame basis.
However, in the above case, the VTR mode actually changes after 4 fields at worst from the start point INP and end point OUP, and furthermore, if there is a communication error, it will change after 8 fields, and from the viewpoint of editing accuracy. The drawback is that it cannot withstand use.

E. Means for Solving Problems In the present invention, control data is transmitted field by field from the controller 13 to the video signal reproducing device 1 and the video signal recording device 2 to which the reproduced video signal is supplied and recorded. and a video signal reproducing device 1 and a video signal recording device 2.
In the method of controlling the video signal recording device 2 to a predetermined state, the video signal recording device 2 is provided with a time counting means, and the controller 13 transmits a playback start command to the video signal playback device 1 and the video signal recording device 2 to put them in a playback state, The controller 13 sends control data for each field to the time counting means of the video signal recording device 2, indicating how many fields of time there are from a predetermined time position before the target time to the target time, and the time counting means is activated. The control data is advanced in synchronization with the control data, and when the counting time of the time counting means reaches a preset time value, the target time arrives and the recording of the video signal recording device 2 starts or ends. This is what I did.

F Effect The time counting means of the video signal recording device 2 advances in synchronization with the controller data transmitted from the controller 13 for each field, and when the counting time of the time counting means reaches a preset time value, the target is reached. When the time comes, recording by the video signal recording device 2 starts or ends.

G Example An example of the method of this invention was carried out using two machines as described above.
An example of editing using a VTR and controller will be explained.

_G1 Description of Editing System FIG. 1 is a timing chart of editing operations using the method of this invention, and FIG. 2 shows an example of the editing system.

The system shown in FIG. 2 utilizes the above-mentioned communication method, and the reproduction VTR 1, recording VTR 2, and editing controller 13 are each provided with communication microcomputers 1C, 2C, and 13C, respectively.

The playback audio signal AU and playback video signal VI of the VTR 1 are connected to connection cables 14 and 1, respectively.
5 to the VTR 2. Also,
A reproduction control pulse CTL from the VTR 1 is supplied to the controller 13.

In this example, the controller 13 and
The VTRs 1 and 2 are connected by a single communication cable 16, and this controller 13 side serves as a master machine to synchronize communications, and communications are repeatedly performed in synchronization with the vertical cycle.

The structure of data sent and received in one communication is as follows.
As shown in the figure, four start bits X ₁ to X ₄ are generated by the controller 3 during one field, and when viewed from the controller 13, the data after the first start bit X ₁ is The period is the transmission period from controller 3 to VTR 1, after start bit X ₂ it is the reception period of data from VTR 1, after start bit X ₃ it is the transmission period to VTR ₂ , after start bit This is the period for receiving data from the VTR 2, and communication is performed in a time-division manner.

Although this is a case where bidirectional communication is performed using one communication line, a configuration in which a transmission line and a reception line are provided separately may also be used.

G ₂ Explanation of editing operation Figure 4 is a flowchart of the program executed by the microcomputer 13C of the controller 13 during editing operation, and Figure 5 is a flowchart of the program executed by the microcomputer 2C of the VTR 2.The timing chart of Figure 1 is as follows. Editing operations will be explained with reference to these flowcharts.

First, find the starting point INP and ending point OUP of the image part to be recorded on VTR 2 in VTR 1,
This is stored in the controller 13.
For example, when starting playback of the VTR 1, the counter is reset to "0", and when the playback state is started, the control pulse CTL is counted as the count clock of the counter (microcomputer) of the controller 13, and each point INP, OUP may be stored as a count value from the reset point.

Next, as shown in FIG.
Edit mode commands such as assemble and insert are sent from the VTRs 1 and 2 (step [101]). Next, when the editing start button is pressed (step [102]), the VTR 1 brings the tape to the starting point INP, as shown in Figure 1, and then
Rewind from INP (steps [103] and [104]), 7 seconds or 30Hz control pulse
When you go back by 210 CTLs (step [105]),
Stop once (step [106]). Next, the counter (microcomputer) of the controller 13 is preset to, for example, a count value of "210" (step [107]). Next, from this point on, a command is sent from the controller 13 to put VTRs 1 and 2 into playback mode.
Sent to VTRs 1 and 2. Then, as shown in FIG. 1, the VTRs 1 and 2 enter the playback state at the same time, and the counter of the controller 13 counts down the playback control pulse CTL from the VTR 1 (step [109]). Then, the NEXT message with the content “The next mode is recording” is sent to VTR2.
Send the REC command (step [110]).

The countdown progresses and the count value becomes "5".
i.e. the control pulse than the starting point INP
When a time point five times before the CTL is detected (step [111]), as shown in FIG.
Data showing that it is 9 feeds up to INP
BFIN i=9 is sent (step [112]). Then, sequentially, for each field, i of data BFIN i indicating that there are i fields left is counted down (step [113]), and BFIN i=
It is sent to 0 (steps [113] to [114]).

Then, as explained later, at BFIN 0,
That is, at the starting point INP, the VTR 2 is changed from the playback state to the recording state.

Next, the counter of the controller 13 is preset to the number of controller pulses corresponding to the time length from the end point OUP to the start point INP (step [115]). Since VTR1 continues to play, its playback control pulse
Count down CTL from this preset value (step [116]).

Next, a NEXT PB command indicating that "the next mode is playback" is sent to the VTR 2 (step [117]).

Then, the countdown of the counter of the controller 13 progresses and the count value becomes "5", that is,
This time, control pulse from end point OUP
When a time point 5 times before CTL is detected (step [118]), in the same way as for the starting point INP,
Data BFOUT9 is sent from the controller 13 to the VTR 2, indicating that there are nine fields left until the end point OUP (step [119]). Then, one field after another, j
The value of j of data BFOUTj indicating that it is a field is counted down (step [120]),
It is sent to j=0 (steps [120] [121]).

Then, as will be described later, when j=0, the VTR 2 changes from the recording state to the playback state. With this, the editing operation by the controller 13 is completed.

Next, let us explain the flowchart of the operation of the VTR 2 shown in Figure 5.

First, when an editing command is received from the controller 13, the VTR 2 enters an editing standby state (step [201]). Next, a playback mode command (step [108]) is received from the controller 13, and as shown in FIG.
It enters playback mode at the same time as VTR1 (step [202]).

Then, a NEXT REC command indicating "the next mode is recording" is received from the controller 13.

When it is determined that the BFIN9 data has arrived from the controller 13 (step [203]), the counter of this VTR2 (microcomputer 12
The count value C of the counter C is preset to "9". Then, the count value C of this counter starts to be counted down by the double signal of the control pulse CTL (step [205]).
Next, the count value C of this counter is calibrated using the data BFIN i from the controller 13 (step [206]). That is, when C=i, the count value C is correctly counted down in synchronization with the data, and the countdown continues as it is. Furthermore, when C>i, the count value C has preceded the count value C.
is re-preset to match i. C
When <i, the value of i is ignored.

When it is detected that the count value C thus calibrated has become 0 (step [207]), the VTR 2
changes from the playback state to the recording state (step [208]).

Since the point in time when C=0 is exactly the starting point INP as shown in FIG. 1, the VTR 2 correctly shifts to the recording state from the starting point INP.

Note that when BFIN1, the erasing rotary head is activated, and when BFIN0, recording is made immediately.

When the recording state is entered in this way, as shown in Figure 1, the controller 13 sends a command NEXT PB indicating "the next mode is playback" to the VTR 2, which is received and decoded by the microcomputer 12C. ing.

In this recording state, when it is determined that the data of BFOUT9 has arrived from the controller 13 (step [209]), the counter of the VTR 2 is again preset to the count value C=9 (step [210]), and the Similarly, a down count is started by a 60Hz clock signal (step [211]). Then, as described above, the count value C of the counter is calibrated using the data BFOUT j from the controller 13 (step [212]).
When it is detected that C=0 (step [213]), the VTR 2 shifts from the recording state to the playback mode (step [214]).

This C=0 position exactly corresponds to the ending point OUP, so the VTR2 is placed at the starting point as shown in Figure 1.
A recording state is entered from INP to the end point OUP, and an editing operation has been performed. Note that at BFOUT1, the erasing rotary head is turned off,
The time point of BFOUT0 is set to be the correct recording end point. This concludes the process.

In this way, the VTR 2, which is the controlled device, has a built-in counter, and at a point before the command start point or end point, the counter is triggered with data indicating that point, and the counting operation of this counter is started. Since the command is executed by detecting the start point or end point as the count value, even if there is a transmission error from the controller 13, there is no problem with the counting operation of the counter, and the command is reliably executed near the start point or end point. Implemented. Furthermore, if the count value is set in units of one field, the accuracy is in units of one field, which is much higher precision than the conventional one.

Note that the same effect can be achieved by providing a timer for a certain period of time on the controlled device instead of a counter, and triggering the timer from the controller for the specified period of time before the start point or end point. .

However, as described above, if the counter is calibrated with the transmitted data and counts down to find the start and end points, control with very high accuracy can be achieved.

In addition, when using the communication method described above,
Since commands such as mode change can be sent before the start point or end point, other information can also be sent in the remaining time.

Also, even if the commands BFIN i and BFOUT j that trigger the VTR2 counter are interrupted while being sent, the counter will continue to increment by itself.
Reliable control is possible.

Furthermore, when the above communication method is used, even if there are multiple communication partners, control can be performed at the same time because of periodic communication.

It should be noted that the counter of the VTR 2 may, of course, be configured to count up instead of counting down, and execute the command when it reaches a predetermined count value.

G ₃ Explanation of other examples In addition, although the above example is a case where there is only one recording VTR, the present invention can also be applied when multiple recording VTRs are connected as shown in Fig. 6. .
In this case, the plurality of recording VTRs 21, 22, . . . can be connected to the controller 13 through one common connection line.

The start or end point of editing can be multiple points.
It may be common to VTR21, 22..., but for example, VTR21 has BFIN0, and VTR2
2 is the point of BFIN1, VTR23 is the point of BFIN2, and so on, VTR21,
By making settings in the microcomputers 22, 23, . . . , the start point or end point can be set separately.

Also, if you add the identification codes of these multiple VTRs 21, 22, 23... to the data BFIN i and BFOUT j and send them, you can edit not all VTRs but any VTR selected by the identification code. .

Note that since there are multiple editing modes such as assemble, insert, and preview, data indicating which editing mode is selected is sent from the controller 13 to the VTR in advance.
If there is only one mode, there is no need to send that mode signal.

Further, the present invention is not limited to the above-described editing system, but can also be used to control the power on/off of a controlled device using a timer, for example. In addition, it can be applied to various types of control.

H. Effect of the invention In this invention, instead of sending command change data at the start point or end point, a clock counting means such as a counter is provided in the video signal recording device.
Control data indicating how many fields of time there are from a predetermined time position before the start point or end point of recording to the target time is sent to the clock counting means for each field, and the time counting means is sent to the clock counting means using the control data. When the counting time of the time counting means reaches a preset time value, the target time arrives and the recording of the video signal recording device starts or ends, so real-time can be controlled. Furthermore, since it is sufficient to simply transmit data for synchronizing the time counting means, there is no need for 40 to 60 pin cables as in the past, and the hardware configuration is simple.

Further, even if data from the controller is interrupted due to a transmission error, the time counting means automatically advances, so that the command is reliably executed at the scheduled time position.

[Brief explanation of drawings]

FIG. 1 is a timing chart for explaining this invention, FIG. 2 is a block diagram of an example of an editing system to which this invention is applied, FIG. 3 is a diagram for explaining communication data, and FIG. 4 is a diagram of a controller. FIG. 5 is a flowchart of the editing operation of a recording VTR. FIG. 6 is a block diagram of another example of the editing system. FIG. 7 is a block diagram of an example of a conventional editing system. Figure 8 is a timing chart for explaining it, Figure 9 is a diagram for explaining an example of communication data used in the improved editing system, and Figure 10 is a diagram for explaining a conventional editing method using the communication data. This is a timing chart for. INP is the control start point, OUP is the control end point, BFIN
9, BFIN8... and BFOUT9, BFOUT8... are transmission data for triggering.

Claims (1)

[Scope of Claims] 1. Control data is transmitted from the controller to a video signal reproducing device and a video signal recording device to which the reproduced video signal is supplied and recorded, so that the video signal reproducing device and the video signal recording device In the method of controlling the device to a predetermined state, the video signal recording device is provided with a time counting means, and the controller sends a playback start command to the video signal playback device and the video signal recording device to set each to a playback state. None, the controller transmits control data for each field to the time counting means of the video signal recording device, indicating how many fields of time there are from a predetermined time position before the target time to the target time, and The time counting means is advanced in synchronization with the control data, and when the counting time of the time counting means reaches a preset time value, the target time arrives and the video signal recording device starts recording. A method for controlling a video signal reproducing device and a recording device, characterized in that: