JPH05325501A - 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 preventing damage of the magnetic tapes. CONSTITUTION:A reference signal REF synchronized with a video signal is measured independently of the traveling state of the tape by a counter 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 of the tape is measured by a counter 3. Count values of the counters 1 and 3 are fetched by a CPU 4 on the recording side of a master VTR and the reproducing side of a slave VTR respectively, and a multiplied value of a count value of the reference signal REF and a reference tape speed together and the data of the CTL signal are compared in difference to decide the tape speed. Then, the timing for commencing the phase modification and the timing for commencing this comparison are controlled by each CPU 4 so as to be different in accordance with their respective reference tape speed.

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.

By the way, in the VTR, slow reproduction, double speed reproduction, still reproduction, etc. can be performed by transporting the tape at a reference speed different from that during recording.
In the case of such special reproduction, the reproducing head is provided with a position changing means such as an electro-mechanical conversion element so that the tracking is always performed correctly and a normal video signal can be obtained.

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 original tape is rewound by a position (preroll time T.times.reference tape speed x ') before the editing start point, and the phase adjustment control is started (step S1). Then, the tape position TCmn on the master side is fetched from the time code reader 11 (step S2), and then the tape position Tmn on the slave side is read.
Serial communication of Csn from the slave VTR 20 (SI
(O) to capture (step S3). Then, (editing start point TCmo-current position TCmn) on the master side and {(editing start point TCso-current position TCsn) / reference tape speed x '} on the slave side are compared, and Command the speed x to the slave VTR 20. Then, the processing shown in these steps S2 to S4 is repeated, and when the expression 2 is satisfied, this phase adjustment control is completed (step S5).

[0007]

X = x '-[{(TCso-TCsn) -x'}-(TCmo-TCmn)] × k k is a constant

[0008]

(2) (TCso-TCsn) / x = TCmo-TCmn

[0009]

However, in the above-mentioned conventional VTR, the transfer of the slave side original tape and the master tape is started at the same time, and the original tape is controlled at the speed x shown in Formula 1. , Fig. 9
When the reference tape speed x'on the reproducing side (original tape) is higher than the reference tape speed x'on the recording side (master tape) (double in FIG. 9) as shown in FIG. Therefore, the slave side V
There is a problem that the tape speed x of TR becomes larger than the reference tape speed x ', so that the time until completion of the phase adjustment becomes long. Further, if the reference tape speed x'on the reproducing side is near the limit, the original tape may be damaged.

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 a plurality of magnetic tapes and preventing damage to the magnetic tapes. The purpose is to provide.

[0011]

In order to achieve the above object, the present invention is directed to reproducing information recorded on a first magnetic tape by a reproducing apparatus and recording it on a second magnetic tape by a storage apparatus. , The reproduction start position of the first magnetic tape and the second position
In the editing system for performing the phasing with the recording start position of the tape, the phasing start timing of each of the reproducing device and the recording device is determined according to the reference tape speed of the first and second magnetic tapes, and the common reference is used. Signal count value and first and second
The tape speeds of the first and second magnetic tapes are determined by comparing the running amounts of the magnetic tapes, and the timing of starting the comparison is determined according to the reference tape speeds of the first and second tapes. It is characterized by

[0012]

According to the present invention, with the above construction, the timing of starting the phase adjustment of each of the reproducing apparatus and the recording apparatus is determined according to the reference tape speed of the first and second magnetic tapes, and the common reference signal of information is counted. The tape speed of the first and second magnetic tapes is determined by comparing the value and the running amount of the first and second magnetic tapes, and the timing for starting this comparison is set to the timing of the first and second magnetic tapes. Since the tape speed is determined according to the reference tape speed, it is possible to optimize each tape speed to shorten the phase adjustment time when editing data between magnetic tapes and prevent damage to the magnetic tapes.

[0013]

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 a flow chart for explaining the operation at the time of phase adjustment of the master VTR and the slave VTR of FIG. 2, and FIG. 4 is a recording of the slave VTR of the master VTR. A timing chart showing a comparative example of the speed patterns of the original tape and the master tape when reproducing at twice the speed, and FIG. 5 shows the operation of the phase adjusting module of each CPU of the master VTR and the slave VTR of FIG. 3 is a flowchart for explaining the above.

The VTR shown in FIG. 1 is used as a master VTR and a slave VTR, and both VTRs have the same structure. A counter (A) 1, a time code reader (TCR) 2, and a counter (B) 3 are connected to an input side of a control device (CPU) 4, and a servo circuit 5 is further provided.
Is connected to the output side of the CPU 4. Counter (A)
1 measures the reference signal synchronized with the video signal, without depending on 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.
The TCR 2 decodes the time code indicating the address of the tape, and the counter 3 measures the CTL signal of the tape.
The CPU 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 control data is sent to the servo circuit 5 which controls the tape running based on the detection data. Output,
Further, as shown in FIG. 2, communication is performed with another VTR by serial communication (SIO).

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, the operation of this embodiment will be described with reference to FIGS. In this embodiment, for example, the slave side V
Video played by TR at double tape speed VTR on master side
The operation in the case of recording at a tape speed of 1 will be described. The master-side VTR 6 rewinds the master tape from the editing start point by a predetermined amount and stands by, and the slave-side VTR 6
In step 7, the original tape is rewound from the editing start point by an amount twice as much as the rewinding amount on the master side VTR 6 and stands by. Then, in FIG. 3, in this standby state, the master side VTR 6
When the tuning key is operated, the CPU 4 of
Modes A, B, C of the slave VTR 7 which will be described later
Start time t ₁ ′, t ₂ , t ₃ ′ of the master VTR 6
The start times t ₁ , t ₂ , and t ₃ of modes A, B, and C are calculated (step S10). The start time t ₂ of the mode B of the master VTR 6 and the slave VTR ₇ is the same as the edit start time, that is, the phase adjustment completion time t ₄ .

[0017]

## EQU3 ## Conventional preroll time = t ₄ -t ₂ t ₁ ′ = t ₂ −x / 2α t ₃ ′ = t ₂ + x / 2α t ₁ = t ₂ −1 / 2α t ₃ = t ₂ + 1 / 2α x: Double speed of the reference tape speed of the slave VTR, α: Tape acceleration Therefore, the times t ₁ ′ and t ₃ ′ depend on the reference tape speed SP (∝x) of the slave VTR.

Then, in step S11, it is determined whether or not each of the calculated start times has been reached, and at time t ₁ ′, mode A is instructed to the phase adjusting module of the slave VTR 7 by serial communication (step S12). At time t ₁ , mode A is instructed to the phasing module of the master VTR 6 (step S13), and mode B is instructed to both phasing modules of the master VTR 6 and the slave VTR 7 at time t ₂ ( step S14), and instructs the mode C serial communication to compensator module on the slave side VTR7 at time t ₃ '(step S
15) At time t ₃ , mode C is instructed to the phase adjusting module of the VTR 6 on the master side (step S1).
6).

FIG. 4A shows the speed pattern of the original tape when the slave VTR 7 reproduces at double speed, and FIG. 4B shows the case where the master VTR 6 records at single speed. 2 shows the speed pattern of the tape. The phase adjustment start time t ₁ ′ of the slave VTR 7 is the master side VT.
R6 is set earlier than the phase modifying the start time t ₁ of, also, the compensator start time t ₁ ', t ₁ is set both earlier than start time t ₂ of the mode B. Slave VTR7 mode C
Start time t ₃ of the 'is set later than the start time t ₃ of the Mode C of the master side VTR 6.

Next, at step S17, when the phase adjusting modules of both the master side VTR 6 and the slave side VTR 7 have completed the phase adjusting at time t ₄ of the edit starting point, the mode is shifted to the edit (EDIT) mode, When the phasing is not completed, the mode shifts to the STOP mode, and the phasing modules of both the master VTR 6 and the slave VTR 7 are stopped (step S18).

Next, the operation of the phase adjusting module of each CPU 4 of the master VTR 6 and the slave VTR 7 will be described with reference to FIG. First, the initial data CTL ₀ of the CTL signal is fetched from the counter (B) 3 (step S21),
In the following step S21, the mode set as described above is determined. If neither mode is set, wait, and if mode A is set,
The control data of the reference tape speed SP is output to the servo circuit 5 (step S24). Here, the reference tape speed SP is 1 × speed on the master side VTR 6. Slave side VT
R7 is x times faster. Therefore, the respective tapes on the master VTR 6 and the slave VTR 7 start running at the reference tape speed SP by the servo circuit 5, but as can be understood from the above mathematical formula 3, when the reference tape speed SP is different, it is adjusted. The phase start timings t ₁ and t ₁ ′ are different.

Next, when the mode B is set,
First, the initial data SYNC0 of the reference signal from the counter (A) 1 is fetched only once (step S23), and the control data of the reference tape speed SP is output to the servo circuit 5 (step S24). That is, the second and subsequent processes in mode B are the same as those in mode A.

Next, when the mode C is set,
Data CTLn of counter (B) 3 (step S25)
And the data SYNCn of the counter (A) 1 (step S
26), and the reference signal data SYNC
The value obtained by multiplying the difference between n and the initial data SYNC ₀ by the reference tape speed SP and the difference between the CTL signal data CTLn and the initial data CTL ₀ are compared, and the tape speed S
P'is determined and its control data is sent to the servo circuit 5
Output to. Then, in mode C, (SYNCn-SYNC ₀ ) xSP = at each VTR on the master side and the slave side.
(CTLn-CTL ₀₎ state of completing the compensator when successive predetermined time (step S28).

[0024]

SP ′ = SP − {(CTLn−CTL ₀ ) − (SYNCn−SYNC ₀ ) × SP} × k k: constant Therefore, according to the above embodiment, each of the master side VTR 6 and the slave side VTR 7 is represented. When the reference tape speeds SP are different, the phase adjustment start timings t ₁ ′, t ₁ are changed according to each reference tape speed SP, and the count value of the common reference signal does not depend only on the running state of each tape. 'determines, further, the start timing t ₃ of the comparison' tape speed SP is compared with the traveling amount CTLn of SYNCn and tape, so changed according to t ₃ in the reference tape speed SP, the slave VTR7 The tape speed does not greatly exceed the reference tape speed SP, the phase adjustment time when editing data between magnetic tapes can be shortened, and the magnetic tape is prevented from being damaged. be able to.

[0025]

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 tape, the start timings of the reproduction device and the recording device are adjusted to the reference tape speeds of the first and second magnetic tapes. , The tape speed of the first and second magnetic tapes is determined by comparing the count value of the common reference signal with the running amount of the first and second magnetic tapes, and the comparison is started. Since the timing to perform is determined according to the reference tape speed of the first and second tapes, it is possible to optimize each tape speed and shorten the phase adjustment time when editing data between magnetic tapes.
It is possible to prevent damage to the magnetic tape.

[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 a flowchart for explaining an operation at the time of phase adjustment between the master VTR and the slave VTR shown in FIG.

FIG. 4 is a timing chart showing a comparative example of speed patterns of an original tape and a master tape when a slave VTR reproduces at a speed twice as high as a recording speed of a master VTR.

5 is a flowchart for explaining the operation of a phase adjusting module of each CPU of the master VTR and the slave VTR 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.

FIG. 8 is an explanatory diagram showing respective speeds of a master tape and an original tape in a conventional example.

[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 (1)

[Claims] 1. A reproducing start position of the first magnetic tape and a second tape before reproducing the information recorded on the first magnetic tape by the reproducing device and recording it on the second magnetic tape by the storage device. In the editing system for performing the phasing of the recording start position of the recording medium, the phasing start timing of each of the reproducing device and the recording device is determined according to the reference tape speed of the first and second magnetic tapes, and the common reference signal The tape speeds of the first and second magnetic tapes are determined by comparing the count value and the running amounts of the first and second magnetic tapes, and the timing of starting this comparison is set to that of the first and second magnetic tapes. An editing system characterized by determining according to a standard tape speed.