JPS6194461A - Synchronous coupling device - Google Patents

Abstract

PURPOSE:To facilitate edition of a recorded tape by synchronizing time codes of plural VTRs of unified camera type mutually by radio waves and thereby synchronizing time axis of video signals recorded by the VTR by time code. CONSTITUTION:A time code generator 3 and a main time code transmitter 1 that FM-modulates 4 a main time code Sm from the generator 3 and transmits very high frequencies from an antenna 2 are provided to plural VTRs 5-7 of unified with camera type. Radio waves from the transmitter 1 are received by the antenna 8 of VTRs 5-7 and frequency conversion and FM demodulation are made by demodulator 11. The time code Sm demodulated by the demodulator 11 is supplied to a time code reading device 12, and time code data Dm is outputted. A frame pulse Pf from the reading device 12 is supplied to a timing circuit 13, and a load pulse Pl formed in the circuit 13 is supplied to a synchronizing signal generator 15. Data Dm from the reading device 12 is supplied to the generator 15 as preset data and VTRs 5-7 are synchronized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synchronous coupling device suitable for use when producing a broadcast program using, for example, a plurality of camera-integrated VTRs.

[Conventional technology]

Recently, integrated camera V for broadcasting using cassette tape has been introduced.
2. Description of the Related Art With the rapid spread of TR, news programs, sports programs, and the like are increasingly being produced using a plurality of camera-integrated VTRs. In addition, camera-integrated VTRs are attracting attention not only for news programs but also for producing artistic programs.

Camera-integrated VTRs for broadcasting each have a built-in time code generator, and are configured to record the time code from the time code generator P1 on an N tape along with the image pickup output. As a time code, S is recorded on an audio track stretched in the longitudinal direction of a magnetic tape.
The MPT time code or the VrTC time code recorded during the vertical blanking period of a video track formed diagonally in the width direction of the magnetic tape is used.

[Problem that the invention seeks to solve]

Conventionally, since each camera-integrated VTR records the time code from its own time code generator on magnetic tape, there is no time code difference between tapes recorded by multiple camera-integrated VTRs. There is no correlation (, multiple (■
There is a time axis shift in the video recorded on the tape,
The drawback was that editing was difficult.

Therefore, an object of the present invention is to provide a camera-integrated VTR or a portable VTR without sacrificing the advantages of increased mobility.
An object of the present invention is to provide a synchronization coupling device that correlates the time codes of a plurality of VTRs.

[Means for solving problems]

The present invention comprises a transmitter 1 having a first time code generator 3 that generates a main time code and means 2.4 for radiating the output of the first time code generator 3 as radio waves;
Means 8, 11, 12 for receiving radio waves from the transmitter 1 and outputting the main time code, a second time code generator 15 for generating the sub time code, and from the second time code generator 15. This is a synchronization coupling device comprising synchronization circuits 13 and 14 for synchronizing the sub-time code of the sub-time code with the main time code.

[Effect]

The main time code is transmitted wirelessly, converted to time code data at each of the plurality of receiving sides, and this time code data is used to generate each time code built into an imaging and recording device such as a plurality of camera-integrated VTRs. The sub time code from the time code generator 15 is preset in the time code generator 15 and is synchronized with the main time code,
This sub-time code is recorded on a magnetic tape by each camera-integrated VTR.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of this embodiment. In FIG. 1, 1 indicates a main time code transmitter, and radio waves of the main time code are radiated from an antenna 2 of this main time code transmitter 1.

5.6.7 each indicates a camera-integrated VTR, and each camera-integrated VTR includes an imaging section such as an image pickup tube and a CCD image, and a rotating head-type cassette VTR that records the imaging output of this imaging section. It also has a built-in time code generator that generates a sub-time code. Furthermore, each of the camera-integrated VTRs 5°6.7 has built-in antennas 8, 9.10 for receiving radio waves from the raw time code transmitter 1, and a receiving circuit. In this invention, the camera integrated V
The sub-time code generated from the time code orderer built into TRs 5, 6, and 7 is synchronized with the main time code, and the time correlation between the recorded tapes of the individual camera-integrated VTRs 5, 6, and 7 is established. It is something to have.

Figure 2 shows the main time code transmitter 1 and camera integrated V
This figure shows the peripheral circuit configuration of a sub-time code generator of a TR, for example, a camera-integrated VTR5. Although not shown, a similar circuit configuration is provided for each of the time code generators of the other camera-integrated VTRs 6.7.

The main time code transmitter 1 is provided with a time code generator 3, a modulation circuit 4 that modulates the main time code Sm from the time code generator 3 and performs VHF conversion, and an antenna 2 to which the output of the modulation circuit 4 is supplied. It is being The main time code Sm is transmitted by the main time code transmission if at the same time as the camera-integrated VTR 5.6 or 7 starts operating, or during a short period of time before that.

The signal radiated into the air from the antenna 2 of the main time code transmitter 1 is received by the antenna 8, and the received signal is supplied to a demodulator 11 that performs frequency conversion and FM demodulation. A code Sm is obtained.

The output of this demodulator 11 is supplied to a time code reader 12, and time code data Dm is output from this time code reader 12. Further, the frame pulse Pf from the time code reader 12 is supplied to the timing circuit 13, and the load pulse Pl generated by the timing circuit 13 is synchronized with the main time code Sm.

The demodulator 11 generates a squelch output that automatically returns the time code to its self-oscillation period when the electric field strength is in the weak electric field region. The time code reader 12 has a function of detecting time axis fluctuations in the received time code Sm, and is configured to interrupt synchronization when this time axis fluctuation exceeds a permissible range.

Time code data Dm from the time code reader 12 is supplied via an adder 14 to the own time code generator 15 of the camera-integrated VTR 5 as preset data for its time code counter. This time code data Dm is loaded into a time code counter in the time code generator 15 by a load pulse PA from the timing circuit 13. The adder 14 is for adding the time required from when the main time code Sm and the corresponding time code data Dm are loaded to the time code generator 15 to the time code data Dm. 14, the main time code and the sub time code S generated from the time code generator 15 are
s can be suppressed to within one frame.

The timing circuit 13 supplies a latch pulse for latching the corrected time code data to the adder 14, and then generates a load pulse Pl at a timing required by the time code generator 15.

A synchronization signal from a synchronization signal generator 16 of the imaging section is supplied to the time code generator 15, and the time code generator 15 is driven by this synchronization signal. As mentioned above, the main time code Sm and the corresponding time code data D
By loading m into the time code generator 15, the sub time code Ss taken out from the time code generator 15 to the output terminal 17 is synchronized with the main time code Sm. A synchronization signal from the synchronization signal generator 16 is taken out to a terminal 18 and used to form a deflection signal for the imaging section.

In addition, in order to further improve the accuracy of synchronization with the main time code Sm, the frame timing pulse Pf detected from the sync word in the main time code FSm is supplied to the timing correction circuit 19, and the timing correction circuit 19 uses the synchronization signal The configuration is such that the period of the vertical synchronization signal of the generator 16 is corrected.

In this embodiment described above, since the main time code Sm does not need to be transmitted continuously, instead of providing the main time code transmitter 1 independently, a plurality of camera-integrated VTRs 5, 6, 7 are used. The time code generator built into one of the camera-integrated VTRs is the main time code S.
The main time code Sm may be used to generate time code Sm and radiated into the air as a radio wave.

FIG. 2 shows another embodiment of the invention. Although not shown, a main time code transmitter is provided as in the previous embodiment. However, other embodiments require that the main time code Sm be transmitted continuously.

Similar to the previous embodiment, the radio waves received by the antenna 8 are supplied to the demodulator 11, the main time code Sm from the demodulator 11 is supplied to the time code reader 12, and the main time code Sm from the time code reader 12 is supplied to the demodulator 11. Time code data D
m is corrected in the adder 14, and the time code data after this correction is loaded into the time code counter of the time code generator 15.

In this other embodiment, the frame pulse formed from the sync word in the main time code FSm is
and is phase-compared with the output of the synchronizing signal generator 16. The comparison output of this phase comparison circuit 21 is supplied to the synchronization signal generator 16 via a low-pass filter 22. The clock generation circuit in the synchronization signal generator 16 has a CO configuration, and the frequency of the clock from this clock generation circuit is varied according to the control voltage from the low-pass filter 22. Therefore, the phase of the synchronization signal from the synchronization signal generator 16 is synchronized with the king time code Sm.

The synchronization signal output from the synchronization signal generator 16 is supplied to the clock generation circuit of the time code generator 15, and the precision of synchronization between the main time code and the sub time code Ss generated from the time code generator 15 is higher. be taken as a thing.

Furthermore, the timing correction circuit 19 in the above-mentioned embodiment
A circuit similar to the above may be added to shorten the transition time at the rise of synchronous coupling.

In the above embodiment, the present invention is applied to the case where a plurality of camera-integrated VTRs are used, but the present invention uses a combination of a plurality of cameras and a portable ■T daytime device. The same can be applied when

〔Effect of the invention〕

According to this invention, the time axes of video signals recorded by a plurality of VTRs are synchronized with each other by time codes, and the work of editing the recorded tapes of the plurality of VTRs becomes easy. Further, in this invention, a plurality of VT
Since radio waves are used as a medium to synchronize the R time code, there is an advantage that the mobility of the camera-integrated VTR or portable VTR is not impaired in any way.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of this invention, FIG. 2 is a block diagram showing the configuration of a transmitter and receiving side of an embodiment of this invention, and FIG. 3 is a block diagram showing the configuration of an embodiment of this invention. FIG. 2 is a block diagram showing the configuration of the receiving side of the embodiment. 1: Main time code transmitter, 2, 8, 9: Antenna, 5
．． 6.7: Camera-integrated VTR 13, 15 = time code generator, 12: time code reader, 16: synchronization signal generator.

Claims (1)

[Claims] a transmitting section having a first time code generator that generates a main time code and means for emitting the output of the first time code generator as a radio wave; means for outputting a time code, a second time code generator that generates a sub time code, and a synchronization circuit that synchronizes the sub time code from the second time code generator with the main time code. Equipped with synchronous coupling device.