JPH05325502A - Editing system - Google Patents

Abstract

PURPOSE:To provide the editing system capable of shortening the phase modifying time for editing data between magnetic tapes and also of reducing a load on the side of a recording device. CONSTITUTION:A reference signal REF synchronized with a video signal is measured independently of traveling speed of the tape by a counter A 1, and a time code for showing an address of the tape is decoded by a time code reader(TCR) 2, and then a CTL signal is measured by a counter B 3. Measured data of the self-counter A 1, the time code reader(TCR) 2 and the counter B 3 respectively is fetched by each CPU 4 of a master VTR on the recording side and a slave VTR on the reproducing side, and hence the self-tape speed is decided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an editing system suitable for editing, for example, inserting or assembling images using a plurality of video tape recorders (VTRs).

[0002]

2. Description of the Related Art Generally, in editing a video tape,
For example, when inserting the desired video on the original tape that was shot into the specified part of the master tape, the starting point of the video on the original tape (the editing start point on the original tape side)
And the absolute address of the start point (editing start point on the master tape side) of a predetermined portion of the master tape is converted into a time code and set in the editing device. Next, the reproducing side VTR loaded with the original tape and the recording side VTR loaded with the master tape respectively rewind the original tape and the master tape by a predetermined amount from the position of the address obtained by converting the time code. Then, it is transferred from this standby position toward the editing start point.

At this time, each time code recorded on the original tape and the master tape is reproduced and converted into an address, and each address and each preset absolute address of the editing start point of the original tape and the master tape are converted. The difference between
The transfer control, that is, the phase adjustment of the original tape is performed so that these differences match each other. When both of these differences become "0", the video signal reproduced from the original tape is recorded on the master tape.

Here, since the minimum unit of the absolute address in the VTR is one frame, the original tape and the master tape are transferred from the standby position to the editing start point.
It is synchronized frame by frame. Therefore, on the master tape side, the previously recorded video and the newly recorded video from the original tape continue in frame units,
Editing can be performed without image distortion.

FIG. 6 shows a conventional VT for performing the above-mentioned phase adjustment.
FIG. 7 shows a configuration of R, and FIG. 7 is a timing chart for explaining a phasing operation performed by the master side VTR of FIG. 6 using the time code TC. Master side (recording side) VTR1
0 and the slave side (playback side) VTR 20 have timecodes T of the master tape and the original tape, respectively.
C and control (CTL) signal are input, and this time code T
The C and CTL signals are the time code reader (TCR) 1 of the master VTR 10 and the slave VTR 20, respectively.
1 and 21 and counters 12 and 22 detect. Each of the CPUs (Central Processing Units) 13 and 23 of the master VTR 10 and the slave VTR is a time code reader 1 respectively.
The respective detection data of 1 and 21 (or the counters 12 and 22) are fetched, and the CPU 13 of the master side VTR 10 performs the phase adjustment control as shown in FIG.

In FIG. 7, first, the master tape and the original tape are rewound to the standby position before the editing start point (step S1), and the initial value TCso indicating the standby position of the original tape on the slave side is set to VT on the slave side.
The data is fetched from the R20 by serial communication (SIO) (step S2), the initial value TCmo indicating the standby position of the master tape on the master side is fetched from the time code reader 11 (step S3), and this phase control is started. Then, the tape position TCsn on the slave side is fetched from the slave VTR 20 by serial communication (SIO) (step S4),
The tape position TCmn on the master side is set to the time code reader 11
(Step S5).

Then, (editing start point TCso on the slave side
-Compare the editing start point TCmo on the master side with (current position TCsn on the slave side-current position TCmn on the master side),
The speed of the original tape is determined so that the difference becomes "0", and the slave VTR 20 is instructed. Then, the processing shown in steps S4 to S7 is repeated, and when the difference becomes "0", the phase adjustment control is completed (step S
8).

[0008]

However, in the above-mentioned conventional VTR, the master VTR changes the slave VTR so that the difference between the tape position information of the master VTR and the tape position information of the slave VTR becomes constant. Since the control is performed, it becomes difficult to determine the optimum tape speed of the slave VTR when the instructed tape speed and its response speed are different depending on the model of the VTR, such as the inertia of the capstan motor or the cassette reel. However, there is a problem that the phase adjustment time becomes long.

Further, when the master-side VTR controls a plurality of slave-side VTRs, the load on the CPU 13 on the master side increases, and when the tape running on the master side is unstable, the tape running on the slave side is affected. There is a problem of giving. ..

In view of the above-mentioned conventional problems, the present invention provides an editing system capable of shortening the phase adjustment time when editing data between magnetic tapes and reducing the load on the recording device side. The purpose is to provide.

[0011]

In order to achieve the above object, the present invention provides, according to the first aspect of the invention, a reproduction apparatus that provides a first aspect of the invention.
Before reproducing the information recorded on the magnetic tape and recording it on the second magnetic tape by the storage device, the reproduction start position of the first magnetic tape and the recording start position of the second magnetic tape are adjusted. In the magnetic recording / reproducing apparatus, the reproducing apparatus and the recording apparatus respectively compare the count value of the common reference signal with the running amounts of the first and second magnetic tapes during phase adjustment. Characterized by determining the speed of the tape.

According to the second aspect of the invention, the phase adjustment of the recording device and the reproducing device is started by the phase adjusting start command from the recording device, and the recording device completes the phase adjustment from the reproducing device. It is characterized in that the completion of the phase adjustment of the reproducing apparatus is recognized by a signal.

[0013]

According to the first aspect of the present invention, the reproducing device and the recording device respectively compare the count value of the common reference signal of information and the running amount of the first and second magnetic tapes during the phase adjustment. Since the speeds of the first and second magnetic tapes are determined by, it is possible to determine the optimum speeds of the first and second magnetic tapes that are not affected by, for example, the inertia of the capstan motor or the cassette reel, Therefore, it is possible to shorten the phasing time when editing data between magnetic tapes. Moreover, since the recording device does not control the tape speed on the reproducing device side, the load on the recording device side can be reduced.

According to a second aspect of the present invention, according to the above configuration, the recording device and the reproducing device start the phase adjustment by a phase adjusting start command from the recording device, and the recording device receives the phase completion signal from the reproducing device. Since the completion of the phase adjustment of the reproducing apparatus is recognized, the recording apparatus and the reproducing apparatus can perform the accurate editing operation in synchronization with each other.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a VTR which is an embodiment of a main part of an editing system according to the present invention, and FIG.
Master side VTR and slave side VT during video editing
FIG. 3 is a block diagram showing a connection state with R, FIG. 3 is an explanatory diagram showing state transition of the master side VTR of FIG. 2, FIG. 4 is an explanatory diagram showing state transition of the slave side VTR side of FIG. 2, and FIG. 2 is a flowchart for explaining the operation of the CPU of FIG. 1.

The VTR shown in FIG. 1 is used as a master VTR and a slave VTR, and both VTRs have the same structure. The counter (A) 1, the time code reader (TCR) 2, and the counter (B) 3 are connected to the input side of the control device (CPU) 4, and the servo circuit 5 is further connected to the output side of the CPU 4. Counter (A) 1
Measures a reference signal synchronized with the video signal, regardless of the running state of the tape. The reference signal is generated, for example, by the V-SYNC of the reproduced video signal in the slave VTR, and by the V-SYNC of the video signal input from the slave VTR in the master VTR. T
The CR2 decodes the time code indicating the address of the tape, and the counter 3 measures the CTL signal of the tape. C
The PU 4 takes in each detection data of the counter 1, the time code reader 2 and the counter 3, and when a phase adjusting key (not shown) is operated, the PU 4 sends control data to the servo circuit 5 which controls the running of the tape based on the detection data. Output, and as shown in FIG. 2, another V is output by serial communication (SIO).
Communicates with TR.

In FIG. 2, the master-side VTR 6 is connected to the slave-side VTR 7 by a serial communication line, sends an instruction to the slave-side VTR 7 to record the image from the slave-side VTR 7 on its own master tape, and then the slave-side VTR 7. VT
The R7 reproduces the image of its own original tape according to the instruction of the master VTR 6 and transmits it to the master VTR 6.

Next, referring to FIGS. 3 and 4, the master side V
The state transition of TR6 and slave VTR7 is demonstrated.
Incidentally, in FIG. 3, “PLAY1” of the master side VTR 6
The mode indicates tape running after completion of self-phase adjustment.
The "LAY2" mode is for the master side VTR6 and the slave side VTR.
The tape running after completion of both phase adjustments in TR7 is shown, and in this "PLAY2" mode, a transition is made to the edit (EDIT) mode at the edit start position. In addition, in FIG.
The “PLAY3” mode of the slave VTR 7 indicates a state in which the tape is running after the completion of the self-phase adjustment and until the phase completion command is transmitted to the master VTR 6,
The "Y4" mode indicates a state until the shift to the EDIT mode is made by the edit start command from the master side VTR 6 after transmitting the phase adjustment completion command.

First, the master VTR 6 transmits a phase start instruction to the slave VTR 7 when a phase key (not shown) is operated, and transits from the stop (STOP) mode to the phase mode to perform phase adjustment. When the phase adjustment is completed by performing the above, the mode shifts to the "PLAY1" mode. When the slave side VTR 7 receives the phase start instruction from the master side VTR 6, the slave side VTR 7 shifts to the phase adjusting mode. When the phase adjusting is completed and the phase adjusting is completed, the slave side VTR 7 changes to the "PLAY3" mode and outputs the phase adjusting completion command. It transmits to the side VTR6, and it changes to "PLAY4" mode.

The VTR 6 on the master side checks whether or not the phase completion command is received from the VTR 7 on the slave side in the "PLAY1" mode. When the phase completion command is received, the VTR 6 shifts to the "PLAY2" mode and the master tape Transition from the editing start position to the EDIT mode. In the "PLAY1" mode, the master VTR 6 transmits a stop command to the slave VTR 7 as a phase error if the master tape edit start position is passed before the phase completion command is received. Transition to stop mode by itself.

Next, the operation of each CPU 4 of the master VTR 6 and the slave VTR 7 will be described with reference to FIG. First, the CPU 4 initializes each of the initial data SYNC ₀ , TC ₀ , and CTL _{0 of the} counter (A) 1, the time code reader (TCR) 2, and the counter (B) 3 indicating the standby position of its own tape.
Is taken in (step S11). Next, when the time data for editing is a time code, the current time code data TCn is read from the time code reader (TCR) 2.
(Steps S12 and S13), and then the difference Δ between the time code data TCn and the initial data TC _0.
T is calculated (step S14), and the process proceeds to step S17.

On the other hand, when the time data for editing is the CTL signal, the current CTL data CTLn is fetched from the counter (B) 3 (step S15), and then the CTL data CTLn and the initial data CTL ₀ are merged. Difference Δ
T is calculated (step S16), and the process proceeds to step S17.

In the following step S17, the counter (A)
Take in the current reference signal data SYNCn from 1,
Then, the difference ΔSYNC between the data SYNCn of the reference signal and the initial data SYNC0 is calculated (step S
18). Here, the rise of the VTR is ΔT <ΔSYNC due to the inertia of the capstan motor and the cassette reel for running the tape. Therefore, in a succeeding step S19, the tape speed such that ΔT = ΔSYNC is determined, and the control data is output to its own servo circuit 5. When the process shown in steps S12 to S19 is repeated and ΔT = ΔSYNC (step S20), the phase adjustment control is completed.

Therefore, according to the above embodiment, the master side VTR 6 and the slave side VTR 7 each determine their own tape speed by comparing the count value of the common reference signal with the actual tape running amount. , The optimum tape speed can be determined and therefore the phasing time can be shortened. Further, since the master VTR 6 and the slave VTR 7 each determine their own tape speed, the load on the CPU 4 of the master VTR 6 does not increase even when there are a plurality of slave VTRs 7, and the master VTR 6 and the slave VTR 7 It is possible to control so that the running amounts of the respective tapes at the time of phase adjustment are different.

Further, the master side VTR 6 is a slave side VT.
The master side VTR 6 and the slave side VTR 7 simultaneously start phase adjustment by transmitting a phase start instruction to R 7.
Since the phase adjustment completion command is received from the slave VTR 7 and the mode shifts to the "PLAY2" mode, the operations of both VTRs on the master side and the slave side can be synchronized, and accurate editing can be performed.

[0026]

As described above, according to the present invention, the information recorded on the first magnetic tape is reproduced by the reproducing apparatus and the first information is recorded on the second magnetic tape by the storage apparatus.
In the editing system for adjusting the reproduction start position of the magnetic tape and the recording start position of the second magnetic tape, the reproduction device and the recording device respectively perform the common reference signal count value and the first and Since the speeds of the first and second magnetic tapes are determined by comparing the running amount of the second magnetic tape, the first and second magnetic tapes that are not affected by the inertia of the capstan motor or the cassette reel, for example. The optimum speed of the tape can be determined and therefore the phasing time when editing data between magnetic tapes can be reduced. Moreover, since the recording device does not control the tape speed on the reproducing device side, the load on the recording device side can be reduced.

Further, a phase adjustment start command from the recording apparatus starts phase adjustment of the recording apparatus and the reproduction apparatus, and the recording apparatus completes phase adjustment of the reproduction apparatus by a phase completion signal from the reproduction apparatus. Is recognized, the recording device and the reproducing device can perform an accurate editing operation in synchronization with each other.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an editing system V according to the present invention.
It is a block diagram which shows the schematic structure of the principal part of TR.

FIG. 2 is a block diagram showing a connection state between a master-side VTR and a slave-side VTR when a video is edited.

FIG. 3 is an explanatory diagram showing a state transition of a master side VTR of FIG.

4 is an explanatory diagram showing a state transition of a slave VTR in FIG.

5 is a flowchart for explaining the operation of the CPU of FIG.

FIG. 6 is a block diagram showing a schematic configuration of a conventional VTR.

7 is a timing chart for explaining a phasing operation of the master side VTR of FIG.

[Explanation of symbols]

 1,3 Counter 2 Time Code Reader (TCR) 4 CPU (Central Processing Unit) 5 Servo Circuit 6 Master VTR 7 Slave VTR

Claims (2)

[Claims] 1. A reproducing start position of the first magnetic tape and a second magnetic tape before reproducing the information recorded on the first magnetic tape by the reproducing device and recording the information on the second magnetic tape by the storage device. In an editing system for phasing the recording start position of a tape, the reproducing device and the recording device respectively compare the count value of a common reference signal with the running amounts of the first and second magnetic tapes during phasing. An editing system characterized in that the speeds of the first and second magnetic tapes are determined by. 2. A phase adjustment start command from the recording apparatus starts phase adjustment of the recording apparatus and the reproduction apparatus, and the recording apparatus completes phase adjustment of the reproduction apparatus by a phase adjustment completion signal from the reproduction apparatus. The editing system according to claim 1, characterized in that