JPH04156066A - Method and device for converting synchronizing signal - Google Patents

Abstract

PURPOSE:To use a telecamera driven by an internal synchronizing signal by comparing a pulse having a prescribed voltage level larger than a white level with a reference signal so as to generate a control pulse. CONSTITUTION:A horizontal drive signal HD and a vertical drive signal VD are fed from a horizontal drive signal and a vertical drive signal generator to terminals 12, 14, and to waveform shaping circuits 16, 18. A pulse signal P1 outputted from an AND circuit 20 is fed to a waveform shaping circuit 24 via a latch circuit 22, in which the signal is converted into a pulse signal P2 having processing peak level and processing pulse width. The pulse signal P2 receives a phase corresponding to a vertical blanking period of a composite video signal and a level larger than a white level of the composite video signal and generated for each of the two vertical drive signals. Thus, the pulse signal P2 forms a frame synchronization pulse by itself. Thus, the device used for the system is made compatible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for receiving a synchronization signal from means for controlling a television camera and converting it into a new synchronization signal.

(Prior Art) In a monitoring system 1, which is one of information transmission systems, at least one monitor television is switchably connected to a plurality of television cameras via transmission lines. Therefore, the image of the selected TV camera can be displayed on the monitor TV by switching operation! You can do it.

In such an information transmission system, the horizontal and vertical scanning phases of multiple television cameras must be synchronized in order to prevent the monitor television from being disrupted immediately after the television camera switching operation. There is a need.

One of the devices for synchronizing multiple television cameras is to transmit a reference synchronization signal (referred to as a "reference synchronization signal" in the present invention) from a control means such as a controller to the television camera, and to synchronize the television cameras. There are devices that synchronize horizontal scanning and vertical scanning to a transmitted reference synchronization signal.

In such a synchronization device, the reference synchronization signal includes a vertical drive signal, the vertical drive signal and the horizontal drive signal, a vertical synchronization signal, a composite synchronization signal including the vertical synchronization signal and the horizontal synchronization signal, and the composite synchronization signal. A composite video signal or an external synchronization signal having a level greater than the self level of the composite video signal and generated within a period corresponding to a vertical blanking period in the composite video signal is used.

(Problem to be Solved) Devices of this type are commercially available, and are configured as different systems depending on the reference synchronization signals used. Therefore, the devices are not compatible.

The present invention aims to provide compatibility in the equipment used.

(Solution, Operation, Effect) In the conversion method and device of the present invention, a vertical drive signal including a field pulse for synchronizing a television camera, the vertical drive signal and a horizontal drive signal, a vertical synchronization signal including the field pulse, a vertical Either a composite synchronization signal containing a synchronization signal and a horizontal synchronization signal or a composite video signal containing the composite synchronization signal is received as a reference synchronization signal for synchronizing a television camera, and the reference synchronization signal is converted into a new synchronization pulse.

The conversion method of the present invention includes, based on a received reference synchronization signal, one frame synchronization pulse having a level greater than the white level or less than the black level of a composite video signal generated by a television camera every two field pulses. The method includes generating the frame synchronization pulse and supplying the frame synchronization pulse to a video transmission line connected to the television camera in order to synchronize the television camera based on the frame synchronization pulse.

The conversion device of the present invention receives the reference synchronization signal and, based on the reference synchronization signal, converts two fields of one frame synchronization pulse having a level higher than the white level or lower than the black level of the composite video signal generated by the television camera. a first signal processing means that generates each pulse; and a second signal processing means that receives the pulse signal and generates a frame synchronization pulse having a level higher than the white level or lower than the black level of the composite video signal based on the pulse signal. and signal processing means.

A reference synchronization signal output from a means for controlling the television camera is converted into a frame synchronization pulse having a predetermined level, and then transmitted to the television camera. For this reason, it is preferable that the conversion device of the present invention be installed on the side of the monitor television.

According to the present invention, a television camera synchronized by a frame synchronization pulse can be synchronized by another reference synchronization signal.

Further, according to the present invention, since the frame synchronization pulse has a level higher than the white level or lower than the black level of the composite video signal, the frame synchronization pulse can be used on the transmission path for the video signal transmitted from the television camera to the monitor television. It can be transmitted using.

The conversion device of the present invention further receives the video signal transmitted from the television camera and converts the frame synchronization pulse into
It is preferable to include a third signal processing means for inserting the received video signal into a period corresponding to the vertical blanking period of the composite video signal, so that the frame synchronization pulse is inserted into the video signal transmitted from the television camera. without affecting
It can be transmitted using a transmission path for video signals.

Preferably, the conversion device of the present invention further includes a fourth signal processing circuit that receives the signal output from the third signal processing means and removes the frame synchronization pulse from the received signal. As a result, the image reproduced on the monitor television is not affected by the frame synchronization pulse.

In another conversion method and apparatus of the present invention, the composite video signal transmitted via the video transmission path connected to the television camera and generated by the television camera has a level greater than the white level or a level less than the black level. It receives the frame synchronization pulse as a reference synchronization signal and converts it into a composite synchronization signal or into a horizontal drive signal and a vertical drive signal.

Another conversion method of the present invention is to convert the video transmission path by comparing the level of the signal transmitted through the video transmission path with a reference signal having a voltage level approximately equal to the voltage level of the frame synchronization pulse. separating the frame synchronization pulse transmitted through the composite video signal, generating a composite synchronization signal or a horizontal drive signal and a vertical drive signal based on the separated frame synchronization pulse, and generating the generated composite synchronization signal. or a horizontal drive signal and a vertical drive signal to the television camera.

Another conversion device of the present invention may convert the video transmission path by comparing the level of the signal transmitted through the video transmission path with a reference signal having a voltage level approximately equal to the voltage level of the frame synchronization pulse. separating the frame synchronization pulse transmitted through the composite video signal, generating a composite synchronization signal or a horizontal drive signal and a vertical drive signal based on the separated frame synchronization pulse, and generating the generated composite synchronization signal. or signal processing means for supplying a horizontal drive signal and a vertical drive signal to the television camera.

The frame synchronization pulse transmitted through the transmission path is converted into a composite synchronization signal or into a horizontal drive signal and a vertical drive signal, and then supplied to the television camera. For this reason, it is preferable that the other conversion device of the present invention be installed on the side of the television camera.

According to another conversion method and apparatus of the invention, a television camera synchronized by a composite synchronization signal or a television camera synchronized by a horizontal drive signal and a vertical drive signal can be synchronized by a frame synchronization pulse.

Additionally, the frame synchronization pulse is separated from the composite video signal by comparing the level of the transmitted signal with a reference signal having a voltage level approximately equal to the voltage level of the frame synchronization pulse. The frame synchronization pulse can be reliably separated.

(Example) Referring to FIG. 1, the synchronization signal conversion device 10 converts the horizontal drive signal HD shown in FIG. 2(A) and the vertical drive signal VD shown in FIG. Convert to synchronous pulse. Both drive signals HD and VD are NTSC
In the case of the method, 15750Hz and 60Hz, respectively.
It is.

The phases of horizontal drive signal) ID and vertical drive signal VD are:
The horizontal and vertical synchronization signals of the composite synchronization signal are matched, respectively. Therefore, in the illustrated example, the vertical drive signal VD itself acts as a field pulse corresponding to each field of interlaced scanning.

The dimensions of the time axis, that is, the horizontal axis of the signal waveforms are not the same. For this reason, an example of a specific value of the pulse width when applicable to the NTSC system is shown in the figure.

The horizontal drive signal HD and the vertical drive signal VD are supplied to terminals 12 and 14 from known control means, ie, horizontal drive signal and vertical drive signal generators, respectively, and are further supplied from the terminals 12 and 14 to waveform shaping circuits 16 and 1.
8.

Based on the supplied horizontal drive signal HD, the waveform shaping circuit 16 generates a pulse signal shown in FIGS. Output to the terminal.

On the other hand, based on the supplied vertical drive signal VD, the waveform shaping circuit I8 converts the pulse signals shown in FIGS. Output to the other input terminal of .

Both pulse signals output from both waveform shaping circuits 16 and 18 are passed through an AND circuit 2 as shown in FIGS. 2(C) and (D) in the first field of each frame of interlaced scanning.
0, but the AND condition in the AND circuit 20 is not satisfied in the second field, as shown in FIGS. 2(E) and 2(F).

As a result, a pulse signal P1 synchronized with the vertical drive signal of the first field is output from the AND circuit 20 corresponding to the first field every frame of interlaced scanning, that is, every two fields.

The pulse signal P1 output from the AND circuit 20 is supplied to the waveform shaping circuit 24 via the latch circuit 22, and has a predetermined peak value and a predetermined pulse width in the waveform shaping circuit 24 as shown in FIG. 2(G). It is converted into a pulse signal P2.

The pulse signal P2 output from the waveform shaping circuit 24 is supplied to the adding circuit 26 and also to the clipping circuit 28.
supplied to

The pulse signal P2 is given a phase corresponding to the vertical blanking period of the composite video signal, and is given a level higher than the white level of the composite video signal, and
generated every two vertical drive signals. Thus, in the illustrated embodiment, pulse signal P2 constitutes a frame synchronization pulse by itself.

The adder circuit 26 is connected via a terminal 30 to a transmission path for a video signal transmitted from a television camera, and thus receives the video signal transmitted from the television camera via the terminal 30.

The adder circuit 26 inserts the pulse signal P2 supplied from the waveform shaping circuit 24, that is, the frame synchronization pulse, into the transmission line connected to the terminal 30. As a result, the signal at the terminal 30 is inserted into the period corresponding to the vertical blanking interval of the video signal supplied to the terminal 30, as shown in FIG.
The signal shown in H) is obtained.

Such an adder circuit 26 can be an insertion circuit with a circuit configuration like a wired-OR circuit using a plurality of resistors and diodes.

The television camera controlled by the pulse signal P2 is a known television camera that uses the pulse signal P2 as a reference synchronization signal.

For example, in such a television camera, the level of the received signal is compared with a reference signal having a predetermined voltage level higher than the white level of the composite video signal, and when both levels match or the level of the received signal is determined as the reference signal. It is possible to use a television camera which is equipped with means for generating a control pulse when the control pulse is equal to or greater than a value, and means for receiving the control pulse and generating an internal synchronization signal based on the control pulse, and is driven by the generated internal synchronization signal. can.

As shown in FIG. 2(H), the pulse signal P2 has a phase that falls within a period corresponding to the vertical blanking period in the composite video signal. Therefore, even if the pulse signal P2 is transmitted to the television camera by using the transmission path for the video signal transmitted from the television camera to the monitor, which is controlled by the pulse signal P2, the video signal itself is not the same as the pulse signal P2.
Not affected by

Adding circuit 26 also supplies the video signal input from terminal 30 to clipping circuit 28 .

The signal supplied from the addition circuit 26 to the clipping circuit 28 also becomes the signal shown in FIG. 2(H) in which the pulse signal P2 is added to the video signal inputted to the terminal 30.

Therefore, the clipping circuit 2B corrects the level of the portion corresponding to the pulse signal P2 in the video signal to below the black level of the composite video signal, preferably below the pedestal level, based on the pulse signal P2, and outputs the corrected video signal. is output to the video amplifier circuit 32.

Thereby, even if the pulse signal P2 is included in the video signal supplied to the clipping circuit 28, the pulse signal P2 is essentially removed by the clipping circuit 28, so that it is output from the clipping circuit 28. The new video signal becomes a signal that does not include the pulse signal P2.

As a result, as shown in FIG. 2(H), the pulse signal P2 can be transmitted to the television camera using the video signal transmission path.

The new video signal output from the clipping circuit 28 is amplified in the video amplification circuit 32 and then sent to the terminal 3.
4 to the monitor.

The period in which the black level in the video signal is corrected to below may be, for example, a temporal range of 50 μs centered on the pulse signal P2.

According to the conversion device 10, a known television camera that uses a pulse signal P2, that is, a frame synchronization pulse, as a reference synchronization signal can be controlled by a known control means that outputs horizontal and vertical drive signals HD and VD as reference synchronization signals. I'll come.

Instead of using both the horizontal drive signal HD and the vertical drive signal VD, only the vertical drive signal VD may be used to generate the frame synchronization pulse. Such a device can be configured, for example, by using a circuit that generates the pulse signal P1 based on the output signal of the waveform shaping circuit 18 in place of the waveform shaping circuit 16 and the AND circuit 20 in the conversion device 10. I can do it.

Referring to FIG. 3, a synchronization signal conversion device 50 receives the composite video signal shown in FIG. 4(A) as a reference synchronization signal from a known control means, that is, a composite video signal generator, at terminals 52, respectively. Control means for outputting such a composite video signal include a controller, a monitor, a reference television camera, and the like.

The composite video signal generally includes a composite synchronization signal consisting of a horizontal synchronization signal and a vertical synchronization signal. Additionally, the vertical synchronization signal generally includes field pulses corresponding to each field of interlaced scanning.

For this reason, the synchronization signal converter 50 uses field pulses to generate frame synchronization pulses.

The vertical synchronization signal in the composite video signal supplied to the terminal 52 is separated from other signals in the synchronization separation circuit 54, and then rises every first field of interlaced scanning, and
After being converted into a signal having the waveform shown in FIG. 4(B) that falls every field, it is supplied to the waveform shaping circuit 56.

The waveform shaping circuit 56 converts the output signal of the synchronous separation circuit 54 into
The fourth signal rises for a predetermined time from the rise of the output signal.
It is converted into a pulse signal P1 shown in FIG. For this reason,
The pulse signal P1 is generated corresponding to the first field for each frame.

The pulse signal P1 is transmitted to the delay circuit 58 as shown in FIG. 4(D).
As shown in FIG. 3, the signal is delayed by a time slightly shorter than one frame and then supplied to the waveform shaping circuit 60.

The waveform shaping circuit 60 converts the pulse signal P1 into a signal with a predetermined pulse width, and then outputs the signal to the waveform shaping circuit 62 and the clipping circuit 64. The waveform shaping circuit 62 converts the supplied pulse signal into a pulse signal P2 having a predetermined peak value and a predetermined pulse width, as shown in FIG. 4(E).

The converted pulse signal P2 is output to the adder circuit 68 via the output circuit 66.

The pulse signal P2 is given a phase corresponding to the vertical blanking period of the composite video signal, and is given a level higher than the white level of the composite video signal, and
generated every two vertical synchronization signals. Thus, in the illustrated embodiment, pulse signal P2 constitutes a frame synchronization pulse by itself.

The adder circuit 68 is connected via a terminal 70 to a transmission line for a composite video signal transmitted from the television camera, and thus receives the composite video signal transmitted from the television camera via the terminal 70.

Adder circuit 68 has the same function as adder circuit 26 shown in FIG. Therefore, the adder circuit 68 is connected to the output circuit 66.
A pulse signal P2, that is, a frame synchronization pulse supplied from the terminal 70 is inserted into the transmission path connected to the terminal 70. As a result, the signal at the terminal 70 becomes the signal shown in FIG. 4E, in which the pulse signal P2 is inserted into a period corresponding to the vertical retrace period of the video signal supplied to the terminal 70.

The television camera controlled by the pulse signal P2 output from the conversion device 50 is also a known camera that uses the frame synchronization pulse as a reference synchronization signal.

Clipping circuit 64 also receives a video signal provided at terminal 70 from a television camera.

The clipping circuit 64 converts the pulse signal P2 in the video signal based on the pulse signal supplied from the waveform shaping circuit 60.
The level of the period corresponding to is corrected to be below the black level of the composite video signal, preferably below the pedestal level, and a new corrected video signal is output to the video amplifier circuit 72.

Accordingly, even if the video signal supplied to the clipping circuit 64 contains the pulse signal P2, the converting device 50 can also use the clipping circuit 64 because the pulse signal P2 is essentially removed by the clipping circuit 64. The new video signal output from 64 is the pulse signal P2.
The signal does not include

As a result, the pulse signal P2 can be transmitted to the television camera using the video signal transmission path. In this case, the video signal supplied to the clipping circuit 64 becomes the signal shown in FIG. 4(E).

The period in which the video signal is corrected to be below the black level can be, for example, a range of 50 μs centered on the pulse signal P2. This time width is defined by the width of the pulse signal supplied from the waveform shaping circuit 60 to the clipping circuit 64.

The new video signal output from the clipping circuit 64 is amplified in the video amplification circuit 72 and then sent to the terminal 7.
4 to the monitor.

According to the conversion device 50, a known television camera that uses a known external synchronization signal as a reference synchronization signal can be controlled by a known control means that outputs a composite video signal as a reference synchronization signal.

The conversion device so converts the composite sync signal or the vertical sync signal in the composite sync signal to the sync separation circuit 5 instead of the composite video signal.
4, the present invention can be applied to a known device for synchronizing television cameras that uses a known external synchronization signal as a reference synchronization signal using a known control means that outputs a composite synchronization signal or a vertical synchronization signal. can.

In the conversion device 50, the waveform shaping circuit 62 may be omitted, and instead, the output signal of the delay circuit 58 may be supplied to the output circuit 66 as the pulse signal P2.

The synchronization signal conversion device 80 shown in FIG.
receive it.

The frame synchronization pulse is shown in Figures 2 (H) and 4 (E).
) has a level higher than the white level of the composite video signal. The phase of the frame synchronization pulse is within a period corresponding to the vertical blanking period in the composite video signal, and its voltage level is greater than the white level of the composite video signal.

The frame synchronization pulse is applied via terminal 82 to one input terminal of comparator circuit 84 . The other terminal of the comparator circuit 84 is connected to a reference voltage source 86 .
6 receives a reference voltage having a voltage level greater than the white level of the composite video signal.

Comparison circuit 84 compares the voltage level of the signal supplied from terminal 82 with the reference value of reference voltage source 86, and when the two levels match or when the level of the signal supplied from terminal 82 is equal to or higher than the reference value, the frame is determined. A pulse signal synchronized with the synchronization pulse is generated, and the pulse is output to the synchronization signal generation circuit 88.

The synchronization signal generation circuit 88 generates a composite synchronization signal P, a horizontal drive signal HD corresponding to the horizontal synchronization signal, and a vertical drive signal VD corresponding to the vertical synchronization signal based on the pulse signal supplied from the comparison circuit 84. and output their signals to terminals 90, 92 and 94, respectively. Since such a synchronization signal generation circuit is commercially available as one of the semiconductor integrated circuits, a detailed explanation thereof will be omitted.

If the television camera to be controlled is driven by a composite video signal or a composite synchronization signal, terminal 90 is connected to the television camera. On the other hand, if the television camera to be controlled is driven by the horizontal and vertical drive signals ID and VD, terminals 92 and 94 are connected to the television camera.

For this reason, the conversion device 80 may generate either a composite video signal or a composite synchronization signal, and horizontal and vertical drive signals HD and VD, depending on the type of television camera to be controlled. .

When the television camera to be controlled uses a vertical synchronization signal, a known synchronization signal separation circuit is connected after the terminal 90 in the conversion device 80, and the vertical synchronization signal is separated from the composite synchronization signal P in the synchronization signal separation circuit. All you have to do is separate it and output the separated vertical synchronization signal to the television camera.

Note that the level of the frame synchronization pulse may be the black level of the composite video signal, preferably a level lower than the level of the composite synchronization signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electric circuit showing one embodiment of the synchronous signal conversion device of the present invention, FIG. 2 is a diagram showing the waveform of an electric signal in the device of FIG. 1, and FIG. 3 is a synchronous signal of the present invention. A block diagram of an electric circuit showing another embodiment of the conversion device, FIG. 4 is a diagram showing the waveform of an electric signal in the device of FIG. 3, and FIG.
The figure is a block diagram of an electric circuit showing still another embodiment of the synchronous signal conversion device of the present invention. 10.50.80+Synchronization signal conversion control device.

Claims (20)

[Claims] (1) A method for converting a vertical drive signal including a field pulse for synchronizing a television camera into a new synchronization pulse, the method receiving the vertical drive signal and converting the composite video signal generated by the television camera based on the vertical drive signal. A frame sync pulse having a level greater than the white level or less than the black level is generated every two field pulses, and the frame sync pulse is connected to the television camera in order to synchronize the television camera based on the frame sync pulse. A method for converting a synchronous signal, the method including supplying a synchronous signal to a video transmission path. (2) A method for converting a horizontal drive signal and a vertical disturbance signal including a field pulse for synchronizing a television camera into a new synchronization pulse, the method comprising: receiving the horizontal drive signal and the vertical drive signal; One frame synchronization pulse having a level greater than the white level or less than the black level of the composite video signal generated by the television camera is generated every two field pulses, and the television camera is synchronized based on the frame synchronization pulse. In order to let
A synchronization signal conversion method comprising supplying the frame synchronization pulse to a video transmission line connected to a television camera. (3) A method for converting a composite synchronization signal including a horizontal synchronization signal and a vertical synchronization signal including a field pulse for synchronizing a television camera into a new synchronization pulse, the method comprising: receiving the composite synchronization signal; , one frame synchronization pulse having a level greater than the white level or less than the black level of the composite video signal generated by the television camera is generated every two field pulses, and the television camera is synchronized based on the frame synchronization pulse. A synchronization signal conversion method comprising supplying the frame synchronization pulse to a video transmission line connected to a television camera. (4) A method for converting a composite video signal including a composite synchronizing signal having a horizontal synchronizing signal and a vertical synchronizing signal including a field pulse for synchronizing a television camera into a new synchronizing pulse, the method comprising: receiving the composite video signal; , separate the composite sync signal from the received composite video signal, and based on the separated composite sync signal, select one signal having a level greater than the white level or less than the black level of the composite video signal generated by the television camera. Synchronization signal conversion including generating a frame synchronization pulse every two field pulses and supplying the frame synchronization pulse to a video transmission line connected to the television camera in order to synchronize the television camera based on the frame synchronization pulse. Method. (5) Converting a frame synchronization pulse that is transmitted via a video transmission line connected to a television camera and has a level greater than the white level or less than the black level of the composite video signal generated by the television camera into a composite synchronization signal. The method comprises: transmitting the signal through the video transmission path by comparing the level of the signal transmitted through the video transmission path with a reference signal having a voltage level approximately equal to the voltage level of the frame synchronization pulse; separating the frame synchronization pulse from the composite video signal, and generating a composite synchronization signal based on the separated frame synchronization pulse;
A synchronization signal conversion method comprising providing a generated composite synchronization signal to the television camera. (6) A frame synchronization pulse having a level higher than the white level or lower than the black level of the composite video signal transmitted through the video transmission line connected to the TV camera and generated by the TV camera is used as a horizontal drive signal and a vertical drive signal. A method for converting a signal into a drive signal, the method comprising: comparing the level of a signal transmitted via the video transmission path with a reference signal having a voltage level approximately equal to the voltage level of the frame synchronization pulse; The frame synchronization pulse transmitted through the composite video signal is separated from the composite video signal, a horizontal drive signal and a vertical drive signal are generated based on the separated frame synchronization pulse, and the generated horizontal drive signal and vertical drive signal are A method for converting a synchronous signal, comprising supplying a terminal connected to a television camera. (7) A device for converting a vertical drive signal including a field pulse for synchronizing a television camera into a new synchronization pulse, which receives the vertical drive signal and, based on this, converts one pulse signal every two field pulses. a first signal processing means for generating a frame synchronization pulse; and a second signal processing means for receiving the pulse signal and, based on the pulse signal, generating a frame synchronization pulse having a level greater than the white level or less than the black level of the composite video signal. and a synchronous signal conversion device. (8) Third signal processing means further receives the video signal transmitted from the television camera and inserts the frame synchronization pulse into a period of the received video signal corresponding to the vertical blanking period of the composite video signal. The synchronous signal conversion device according to claim 7, comprising: (9) The synchronization signal according to claim (8), further comprising a fourth signal processing circuit that receives the signal output from the third signal processing means and removes the frame synchronization pulse from the received signal. conversion device. (10) A device that converts a horizontal drive signal and a vertical drive signal including a field pulse for synchronizing a television camera into a new synchronization pulse, which receives the horizontal drive signal and the vertical drive signal, and converts the horizontal drive signal and the vertical drive signal based on the , a first signal processing means that generates one pulse signal every two field pulses; and a first signal processing means that receives the pulse signal and, based on the pulse signal, generates a frame having a level higher than the white level or lower than the black level of the composite video signal. and second signal processing means for generating a synchronization pulse. (11) Third signal processing means further receives the video signal transmitted from the television camera and inserts the frame synchronization pulse into a period of the received video signal corresponding to the vertical blanking period of the composite video signal. Claim (10)
The synchronous signal converter described in . (12) The synchronization signal according to claim (8), further comprising a fourth signal processing circuit that receives the signal output from the third signal processing means and removes the frame synchronization pulse from the received signal. conversion device. (13) A device for converting a composite synchronization signal including a horizontal synchronization signal and a vertical synchronization signal including a field pulse for synchronizing a television camera into a new synchronization pulse, the device receiving the composite synchronization signal and converting the composite synchronization signal based on the synchronization signal into a new synchronization pulse. , a first signal processing means for generating one pulse signal every two field pulses;
and second signal processing means for receiving the pulse signal and, based on the pulse signal, generating a frame synchronization pulse having a level higher than the white level or lower than the black level of the composite video signal. (14) Third signal processing means further receives the video signal transmitted from the television camera and inserts the frame synchronization pulse into a period of the received video signal corresponding to the vertical blanking period of the composite video signal. Claim (13)
The synchronous signal converter described in . (15) Claim (14) further comprising a fourth signal processing circuit that receives the signal output from the third signal processing means and removes the frame synchronization pulse from the received signal.
The synchronous signal converter described in . (16) A device for converting a composite video signal including a composite synchronizing signal having a horizontal synchronizing signal and a vertical synchronizing signal including a field pulse for synchronizing a television camera into a new synchronizing pulse, the device receiving the composite video signal; , a first signal processing means for separating the composite synchronization signal from the received composite video signal and generating one pulse signal for every two field pulses based on the separated composite synchronization signal; receiving the pulse signal; Based on this, a second signal processing means generates a frame synchronization pulse having a level higher than the white level or lower than the black level of the composite video signal.
Synchronous signal converter. (17) Third signal processing means further receives the video signal transmitted from the television camera and inserts the frame synchronization pulse into a period of the received video signal corresponding to the vertical blanking period of the composite video signal. Claim (16)
The synchronous signal converter described in . (18) Claim (17) further comprising a fourth signal processing circuit that receives the signal output from the third signal processing means and removes the frame synchronization pulse from the received signal.
The synchronous signal converter described in . (19) Converting a frame synchronization pulse having a level greater than the white level or less than the black level of the composite video signal transmitted via the video transmission line connected to the television camera and generated by the television camera into a composite synchronization signal. The device transmits the signal through the video transmission path by comparing the level of the signal transmitted through the video transmission path with a reference signal having a voltage level approximately equal to the voltage level of the frame synchronization pulse. comprising a signal processing means for separating the frame synchronization pulse from the composite video signal, generating a composite synchronization signal based on the separated frame synchronization pulse, and supplying the generated composite synchronization signal to the television camera; Synchronous signal converter. (20) A frame synchronization pulse having a level greater than the white level or less than the black level of the composite video signal transmitted through the video transmission line connected to the television camera and generated by the television camera is used as a horizontal drive signal and a vertical drive signal. A device for converting into a driving signal, the device converting the signal transmitted through the video transmission path into a drive signal by comparing the level of the signal transmitted through the video transmission path with a reference signal having a voltage level approximately equal to the voltage level of the frame synchronization pulse. Separating the frame synchronization pulse transmitted through the composite video signal, generating a horizontal drive signal and a vertical drive signal based on the separated frame synchronization pulse, and converting the generated horizontal disturbance signal and vertical drive signal. A synchronous signal conversion device including a signal processing means for supplying a signal to a terminal connected to the television camera.