JP3496621B2 - Synchronization system for FPU camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronization system for FPU cameras, and more particularly to a synchronization system for synchronizing output video signals of a plurality of FPU cameras (outdoor relay cameras) installed at points far away from a relay vehicle or a studio. .

[0002]

2. Description of the Related Art Usually, output video signals of a plurality of FPU cameras or the like installed at points far away from a relay vehicle and a studio do not have the same frame frequency and subcarrier frequency. Disturbance occurs when you play.

In order to prevent the synchronization disturbance generated when such video signals are switched, a reference synchronization signal is supplied to each FPU camera from a relay vehicle and a studio via a cable, and an image synchronized with the reference synchronization signal is supplied. I am trying to generate a signal.

However, when a plurality of FPU cameras are installed at a remote location from a relay vehicle or a studio, it is impractical or impossible to supply a reference synchronization signal to each FPU camera via a cable. In such a case, conventionally, in a relay vehicle, a studio, or the like, a frame synchronizer (FS) is used to convert video signals from a plurality of FPU cameras.
The input signal is input to the input terminal to perform synchronization adjustment to prevent synchronization disturbance when switching the video signal.

[0005]

As described above, conventionally, when a plurality of FPU cameras are installed at a remote location from a relay vehicle or a studio, video signals from the plurality of FPU cameras are frame-synchronized in the relay vehicle or the studio. By inputting each to (FS) and performing synchronization adjustment, synchronization disturbance at the time of switching the video signal is prevented. For this reason, a synchronization adjustment process by a frame synchronizer (FS) is required in the relay vehicle or the studio.

An object of the present invention is to synchronize output video signals of a plurality of FPU cameras installed at a remote location from a relay vehicle or studio without using a frame synchronizer (FS) on the relay vehicle or studio side. It is to provide a synchronization system that can.

[0007]

The field relay camera synchronization system of the present invention is a synchronization system for synchronizing output video signals of a plurality of FPU cameras installed at a remote location from a relay vehicle or a studio. Transmitting means installed in the studio to generate a carrier wave synchronized with the color subcarrier of the reference TV signal, generate a pulse signal synchronized with the horizontal and vertical synchronization signals of the reference TV signal, and modulate the carrier wave with the pulse signal. And a receiving unit that is installed on each of the plurality of FPU cameras and that receives the signals transmitted from the transmitting unit and reproduces the horizontal and vertical synchronizing signals of the reference TV signal and the signals that are respectively synchronized with the color subcarriers. The FP
The U camera generates the output video signal based on the output signal of the receiving means.

[0008] Specifically, the transmitting means is configured to transmit the reference T
A sync separator that receives the V signal and separates the horizontal sync signal and the vertical sync signal, and a horizontal sync pulse signal and a frame sync pulse signal that are respectively synchronized with the horizontal sync signal and the vertical sync signal output from the sync separator. A synchronizing pulse generating section for respectively generating, a carrier generating section for generating a carrier synchronized with the color subcarrier of the reference TV signal, and a modulation for quadrature amplitude modulating the carrier by the horizontal synchronizing pulse signal and the frame synchronizing pulse signal. And a section.

The receiving means receives the signal transmitted by the transmitting means and reproduces a carrier wave synchronized with the color subcarrier of the reference TV signal, the horizontal synchronizing pulse signal and the frame synchronizing signal. A demodulation unit for demodulating each pulse signal, and the reference T based on the demodulated horizontal synchronization pulse signal and frame synchronization pulse.
And a sync signal reproducing section for respectively reproducing a horizontal sync signal and a vertical sync signal synchronized with the horizontal sync signal and the vertical sync signal of the V signal.

In the above structure, the modulator of the transmitting means maps the signal levels of the horizontal synchronizing pulse signal and the frame synchronizing pulse signal, and quadrature amplitude modulates the carrier as I and Q channel signals.

Further, the transmitting means may be the plurality of FPUs.
A control signal multiplexing unit that multiplexes a plurality of control signals including identification signals for controlling the cameras, wherein the modulation unit includes the horizontal synchronizing pulse signal, the frame synchronizing pulse signal, and the control signal multiplexing unit. The signal level of the output signal is mapped, and the carrier is quadrature-amplitude-modulated as I and Q channel signals.

Further, the control signal multiplexing section performs time division multiplexing by performing randomization and NRZI conversion for receiving a plurality of control signals including identification signals for controlling the plurality of FPU cameras and removing a DC component. .

Further, the receiving means further includes a demodulation section for demodulating a signal which is quadrature amplitude modulated by the horizontal synchronizing pulse signal, the frame synchronizing pulse signal and the multiplexed control signal, and is demodulated by this demodulating section. And a control signal extraction unit for identifying and extracting a control signal addressed to the own device from the multiplexed control signal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

1 and 2 are block diagrams showing an embodiment of the present invention. FIG. 1 shows a transmitter 1 installed on a relay vehicle or studio side, and FIG. 2 shows a plurality of Fs at remote points.
The receiving devices 2 installed on the PU camera side are shown.

As shown in FIG. 1, the transmitter 1 receives a reference TV signal S1 and separates a horizontal synchronizing signal (H) S2 and a vertical synchronizing signal (V) S3 from each other.
1 and the separated horizontal synchronizing signal S2 and vertical synchronizing signal S3 respectively to generate a horizontal synchronizing pulse signal (HP) S4 synchronized with the horizontal synchronizing signal and a frame synchronizing pulse signal (FP) S5 synchronized with the frame period. The sync pulse generator 12, the carrier wave generator 13 that generates the carrier wave (SC) S6 synchronized with the color subcarrier of the reference TV signal S1, and the control signal that controls the FPU cameras. CONT) S7
Of the carrier signal (SC) S6 with the horizontal synchronizing pulse signal (HP) S4, the frame synchronizing pulse signal (FP) S5 and the control signal (CONT) S7. It has a modulator 15 for outputting and a transmitter 16 for converting this signal S8 into a signal S9 having a predetermined transmission frequency and outputting it.

On the other hand, as shown in FIG. 2, the receiver 2 receives the signal transmitted by the transmitter 1 and outputs it as a predetermined intermediate frequency signal S11, and a carrier (from the intermediate frequency signal S11). SC) Signal S15 synchronized with S6
And a horizontal synchronizing pulse signal (HP) S12, a frame synchronizing pulse signal (FP) S13 and a control signal (CONT) S from the reception output S11.
Demodulation section 23 for demodulating 14 respectively, demodulated horizontal sync pulse signal (HP) S12 and frame sync pulse (FP) S13 respectively, and horizontal sync signal (H) S16 and vertical sync signal synchronized with these pulse signals. (V) Sync signal reproducing section 24 for reproducing S17 respectively
And a control signal extraction unit 25 that receives the demodulated control signal (CONT) S14 and identifies and extracts the control signal S18 addressed to the own device.

The reference TV signal S1 is a standard color TV signal in which all video components are black level, and is a reference TV signal in a relay vehicle or a studio.

Next, the operation of the transmitter 1 will be described.

The sync separator 11 detects and separates the horizontal and vertical sync signals of the reference TV signal S1 and outputs them to the sync pulse generator 12 as a horizontal sync signal (H) S2 and a vertical sync signal (V) S3. Sync pulse generator 12
Generates a horizontal synchronization pulse signal (HP) S4 synchronized with the horizontal synchronization signal (H) and a frame synchronization pulse signal (FP) S5 synchronized with the frame period. Standard T
In the V method, since interlaced scanning is performed in which one frame is composed of two fields, the frame synchronization pulse signal (F
P) is a signal that synchronizes at a cycle twice that of the vertical synchronization signal (V).

The carrier generation unit 13 is a PL including a crystal oscillator.
It has an L circuit and extracts a color burst superimposed on the back porch of the horizontal synchronizing signal of the reference TV signal S1 to obtain a reference T
The carrier wave (SC) S6 synchronized with the color subcarrier (color subcarrier) of the V signal S1 is generated and supplied to the modulator 15.

The control signal multiplexer 14 is provided for each FP at a remote location.
The control signals for controlling the U cameras are respectively received, randomization and NRZI conversion are performed in order to remove the DC component, and the time-division multiplexed control signal (CONT) S7 is output. The control signal of each FPU camera is, for example, a digital signal for performing camera output level control, output channel setting, lens control, pan head control, etc., and includes an identification code indicating a destination and conforms to a predetermined format. Has been generated.

The modulator 15 is arranged to output a horizontal synchronizing pulse signal (H
P) S4, a frame synchronization pulse signal (FP) S5, and a control signal (CONT) S7 are multiplexed, and a carrier wave (SC) S6 is quadrature amplitude modulated.

For example, the horizontal synchronizing pulse signal (HP) S
4. The signal levels of the frame synchronization pulse signal (FP) S5 and the control signal (CONT) S7 are respectively mapped, and the carrier wave (SC) S6 is used as the I and Q channel signals.
Is quadrature amplitude modulated.

The transmitter 16 outputs the output signal S8 of the modulator 15.
Is converted into a predetermined transmission frequency and transmitted as a transmission signal S9.

FIG. 3 shows a horizontal synchronizing pulse signal (HP) S.
FIG. 4 is a diagram showing an example of a multiplexing format of a frame synchronization pulse signal (FP) S5 and a control signal (CONT) S7. For the signal level, for example, the level of the frame synchronization pulse signal (FP) is (1, 0), the level of the horizontal synchronization pulse signal (HP) is (0, -1), and the control signal (CON).
Map the level of T) to (1 / √2, 0, -1 / √2).

Next, the operation of the receiver 2 will be described.

The receiver 21 receives the signal S9 from the transmitter 1.
Is received, the intermediate frequency signal S11 having a predetermined frequency is converted, and the intermediate frequency signal S11 is output to the carrier wave reproducing section 22 and the demodulating section 23.
The frequency of the intermediate frequency signal S11 is, for example, the same frequency as the carrier wave (SC).

The carrier wave reproducing unit 22 includes a P including a crystal oscillator.
It has an LL circuit and changes from the intermediate frequency signal S11 to carrier wave (S
C) signal S1 extracted from the component and synchronized with the carrier wave (SC)
5, that is, the signal synchronized with the subcarrier of the reference TV signal S1 is reproduced.

The demodulation section 23 receives the reproduced carrier signal S15 and the intermediate frequency signal S11, demodulates the quadrature amplitude modulated intermediate frequency signal S11, and outputs a horizontal synchronizing pulse signal (HP).
It outputs S12, the frame synchronization pulse signal (FP) S13, and the control signal (CONT) S14, respectively.

The synchronizing signal reproducing section 24 is a horizontal synchronizing signal (H) S1 synchronized with the demodulated horizontal synchronizing pulse signal (HP) S12 and frame synchronizing pulse signal (FP) S13.
6 and the vertical synchronizing signal (V) S17 are reproduced. The reproduced horizontal synchronizing signal (H) S16 and vertical reproducing signal (V) S17 are synchronized with the horizontal synchronizing signal and the vertical synchronizing signal of the reference TV signal S1.

The control signal extraction unit 25 receives the demodulated control signal (CONT) S14, identifies and extracts the control signal addressed to itself, performs demapping and derandomization processing, and outputs it as a reproduction control signal S18.

The FPU camera operates according to the reproduction control signal S18 output from the receiving device 2, and also reproduces the subcarrier signal S15 and the reproduction horizontal synchronizing signal (H) S16.
And a reproduction vertical synchronizing signal (V) S17, respectively, to generate a video signal.

As described above, the horizontal synchronizing signal, the vertical synchronizing signal of the reference TV signal, and the signal component synchronized with the subcarrier are transmitted from the transmitting device installed in the relay vehicle or the studio side, and this transmitting signal is transmitted to each FPU. By receiving by the receiving devices respectively installed on the camera side, reproducing the signal components synchronized with the subcarrier of the reference TV signal, the horizontal synchronizing signal, and the vertical synchronizing signal, and supplying them to the FPU camera,
The output video signal of each FPU camera can be synchronized with the reference TV signal S1. Further, a plurality of FPU cameras can be individually controlled by identifying and extracting the control signal for each FPU camera.

[0035]

As described above, according to the present invention, a horizontal sync signal, a vertical sync signal of a reference TV signal, and a signal component synchronized with a subcarrier are transmitted by a transmitter installed on a relay vehicle or a studio side. , This transmission signal for each F
The output image of each FPU camera is received by the receiving device installed on each PU camera side, reproduces the signal component synchronized with the subcarrier of the reference TV signal, the horizontal synchronizing signal, and the vertical synchronizing signal, and supplies it to the FPU camera. The signal can be synchronized with the reference TV signal S1. Therefore, since the output video signal of each FPU camera has the same horizontal, vertical synchronization, and subcarrier frequency synchronization, even if the video signals are switched, the synchronization disorder does not occur.

By multiplexing the control signals for controlling each FPU camera and identifying and extracting the control signal for each FPU camera, it is possible to individually control a plurality of FPU cameras.

[Brief description of drawings]

FIG. 1 is a diagram showing a transmission device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a receiving device according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a multiplexing format in a modulator 15 shown in FIG.

[Explanation of symbols]

1 transmitter 2 Receiver 11 Sync separation unit 12 Sync pulse generator 13 Carrier Generation Unit 14 Control signal multiplexer 15 Modulator 16 Transmitter 21 Receiver 22 Carrier recovery unit 23 Demodulator 24 Sync signal playback unit 25 Control signal extractor S1 standard TV signal S2, S16 Horizontal sync signal (H) S3, S17 Vertical sync signal (V) S4, S12 Horizontal sync pulse signal (HP) S5, S13 Frame sync pulse signal (FP) Carrier wave (SC) synchronized with S6 color subcarrier S7, S14 Control signal (CONT)

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI H04N 9/475 H04N 9/475

Claims (7)

(57) [Claims] 1. A synchronization system for synchronizing output image signals of a plurality of FPU cameras installed at a remote location from a relay vehicle or studio, wherein the synchronization system synchronizes with a color subcarrier of a reference TV signal installed on the relay vehicle or studio side. Transmission means for generating a carrier wave and for generating a pulse signal synchronized with the horizontal and vertical synchronization signals of the reference TV signal to modulate the carrier wave with the pulse signal, and the transmission means installed on each of the plurality of FPU cameras. Receiving means for receiving the signal transmitted from the reference TV signal and reproducing the horizontal and vertical synchronizing signals of the reference TV signal and the signals respectively synchronized with the color subcarriers, and the FPU camera is based on the output signal of the receiving means. A synchronization system for an FPU camera, wherein the output video signal is generated. 2. The transmitting means receives the reference TV signal and separates a horizontal sync signal and a vertical sync signal into a sync separator and a horizontal sync signal and a vertical sync signal output from the sync separator, respectively. A synchronization pulse generation unit that generates a synchronized horizontal synchronization pulse signal and a frame synchronization pulse signal, a carrier generation unit that generates a carrier synchronized with the color subcarrier of the reference TV signal, the horizontal synchronization pulse signal, and the frame synchronization. 2. The FPU camera synchronization system according to claim 1, further comprising a modulation unit that performs quadrature amplitude modulation on the carrier wave with a pulse signal. 3. The receiving means receives the signal transmitted by the transmitting means and reproduces a carrier wave synchronized with the color subcarrier of the reference TV signal, the horizontal synchronizing pulse signal and the frame synchronizing signal. A demodulation unit that demodulates a pulse signal, and a synchronization that reproduces a horizontal synchronization signal and a vertical synchronization signal that are synchronized with the horizontal synchronization signal and the vertical synchronization signal of the reference TV signal from the demodulated horizontal synchronization pulse signal and the frame synchronization pulse, respectively. The FPU camera synchronization system according to claim 1, further comprising a signal reproducing unit. 4. The modulating unit of the transmitting means maps the signal levels of the horizontal synchronizing pulse signal and the frame synchronizing pulse signal, and performs quadrature amplitude modulation of the carrier waves as I and Q channel signals. The FPU camera synchronization system according to claim 2. 5. The transmitting means has a control signal multiplexing section for multiplexing a plurality of control signals including identification signals for controlling the plurality of FPU cameras, and the modulating section has the horizontal synchronizing pulse. 3. A signal, a signal level of the frame synchronization pulse signal, and a signal level of an output signal of the control signal multiplexing unit are mapped, and the carrier wave is quadrature amplitude modulated as a signal of I and Q channels.
FPU camera synchronization system described. 6. The control signal multiplexer is configured to control the plurality of FPs.
6. The FPU camera synchronization system according to claim 5, wherein a plurality of control signals including an identification signal for controlling the U camera are respectively received, and randomization for removing a DC component and NRZI conversion are performed to perform time division multiplexing. . 7. The demodulation section demodulated by the demodulation section, wherein the receiving means demodulates a signal subjected to quadrature amplitude modulation by the horizontal synchronization pulse signal, the frame synchronization pulse signal, and the multiplexed control signal. The FPU camera synchronization system according to claim 3, further comprising a control signal extraction unit that identifies and extracts a control signal addressed to the own device from the multiplexed control signal.