JP2819909B2 - Signal transmission system for TV 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 signal transmission system for a television camera, and more particularly to a signal transmission system for a television camera for transmitting a signal from a television camera having a built-in SMPTE color bar signal generation circuit.

[0002]

2. Description of the Related Art FIG. 3 shows a block diagram of a conventional system of this kind. Referring to the figure, a camera head 1 has a luminance signal & chrominance signal generation unit 4 for generating a luminance signal (Y) and a chrominance signal (RY, BY). A triaxial adapter 2 as means for transmitting a signal generated by the camera is attached.

Various signals can be multiplexed and transmitted by the adapter 2, and the adapter 2 is provided with a modulation / demodulation unit 5. The signal from the camera head 1 is transmitted to the base station 6 which is installed at a distance by the adapter 2, and an encoder 8 is provided in the base station 6 to synthesize and output a color video signal.

The reason for adopting such a configuration is that VTR recording using component signals is generally used, and the base station 6 often needs a luminance signal and a color difference signal in addition to the NTSC signal. It is.

In this system, a luminance signal is usually transmitted with a synchronization signal added thereto. However, the base station 6 generates I and Q signals required by the encoder 8 (generated by the IQ signal generator 12). The synchronization signal is once clipped and removed by the black clip unit 11.

The modulation / demodulation unit 10 is for transmitting / receiving signals to / from the triaxial adapter 2 on the camera head side, and the camera / color bar switching unit 9 is for issuing a command for switching between SMPTE color bar signals and camera signals. is there.

When an instruction to generate an SMPTE color bar signal is issued by the switching unit 9, the instruction signal is transmitted to the modulation / demodulation unit 1
0, the signal is transmitted to the modulation / demodulation unit 5 of the triaxial adapter 2, and the color bar generation command is supplied to the luminance signal & color difference signal generation unit 4. As a result, an SMPTE color bar signal is generated from the camera head 1 and is guided to the base station 6 via the triaxial adapter 2.

FIG. 4A shows a color bar luminance signal waveform generated from the camera head 1, which is generated by adding ± 4% black as shown in FIG. This is added to facilitate the black adjustment of the monitor when several monitors are used for one triaxial adapter.

On the base station side that has received the color bar luminance signal of FIG. 4A, the black clip processing is performed by the black clip unit 11 as described above, so that, as shown in FIG. 4% of black will be clipped and deleted.

FIG. 4C shows an output waveform of the encoder 8, in which a synchronizing signal is added again and transmitted to a monitor (not shown).

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a signal transmission system for a television camera capable of obtaining a color bar luminance signal without removing black of ± 4% for facilitating black adjustment of a monitor. It is.

[0012]

According to the present invention, there is provided a television camera having means for generating a color bar signal and means for generating a luminance signal and a color difference signal, and the television camera which is installed physically separated from the television camera. A signal transmission system for a television camera, comprising: means for receiving a transmission signal from a camera to form a black clip of the signal; and a base station having an encoder for generating a video signal from the signal after the black clip and the transmission signal. And wherein the television camera has means for adding a + 4% setup to the color bar signal in response to a color bar signal generation command from the base station, wherein the base station comprises: In response to the generation command, a setup of -4% is added to the output video signal of the encoder. Television camera signal transmission system, characterized in that it comprises means for can be obtained.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system block diagram of an embodiment of the present invention, and the same parts as those in FIG. 3 are denoted by the same reference numerals. In the present embodiment, a + 4% setup generating unit 3 is added to the camera head 1, and a -4
The configuration is such that a% setup generation section 7 is added.

When a color bar generation command is issued by the camera / color bar switching unit 9 of the base station 6,
This command signal is transmitted to the triaxial cable via the modulation / demodulation unit 10 and input to the modulation / demodulation unit 5 in the adapter 2.

The command signal obtained in this way controls the luminance & chrominance signal generation section 4 in the camera head to generate an SMPTE color bar, and at the same time, the + 4% setup generation section 3 sets up + 4% of this color. Superimposed on the bar. At this time, of course, ± 4% black is also superimposed.

The color bar of FIG. 2A thus obtained is transmitted to the base station 6 and black-clipped by the black clip unit 11. The waveform after clipping is as shown in FIG. This waveform is input to the encoder 8. At this time, the -4% setup generator 7 adds the -4% setup, so that the video output is as shown in FIG. 2C.

[0018]

As described above, according to the present invention, since ± 4% black for black adjustment of the monitor is completely superimposed on the color bar and is obtained as a video output, one triaxial adapter can be used. There is an effect that black adjustment required when using several monitors becomes easy.

[Brief description of the drawings]

FIG. 1 is a system block diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of an operation waveform according to the embodiment of the present invention.

FIG. 3 is a block diagram of a conventional television camera signal transmission system.

FIG. 4 is a diagram showing an example of an operation waveform in a conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera head 2 Triaxial adapter 3 + 4% setup generation part 4 Luminance & color difference signal generation part 6 Base station 7 -4% setup generation part 8 Encoder 9 Camera / color bar switching part 11 Black clip part 12 IQ signal generation part

Claims (1)

(57) [Claims] A television camera having means for generating a color bar signal and means for generating a luminance signal and a color difference signal, and a transmission signal from the television camera which is installed physically separated from the television camera. A signal transmission system for a television camera, comprising: a base station having a means for receiving and performing a black clip of the signal and an encoder for generating a video signal from the signal after the black clip and the transmission signal. Means for adding a + 4% setup to the color bar signal in response to a color bar signal generation command from the base station, wherein the base station is responsive to the color bar signal generation command. Means for adding a -4% setup to an output video signal of the encoder. A signal transmission system for a television camera.