JPS5825785A - Color tevevision receiver - Google Patents

Abstract

PURPOSE:To improve the operativity and to reduce the number of volumes to the half to narrow the installation place, by providing a common picture control adjuster for respective processing circuits where television signals of the NTSC system and the RGB system are processed. CONSTITUTION:Signals R, G, and B or the RGB system (digital) are applied to transistors TRs Tr1-Tr2 of a circuit M2 in the negative polarity and have the amplitude adjusted by a contrast volume VR1. They are inputted to an impedance converting circuit of TRs Tr4-Tr6 through DC cut capacitors C1-C3; and at this time, the clamp voltage is adjusted by a brightness volume VR2, and the output signal is supplied to a CRT. In a circuit M1, the signal of the NTSC system is processed in a chroma processing IC circuit IC, and a contrast controlling part Q1 and a brightness controlling part Q2 are controlled by outputs of volumes VR1 and VR2, and the output signal is supplied to the CRT through a signal switch S.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color television receiver.

NTSC system (including PAL or SECUM system) and RG
Conventional color television receivers that receive B-system television signals have separate adjustment volume controls for each system processing circuit in order to control the contrast and brightness of the image. The number increases;
The location of the volume became a problem, such as installing it on the rear of the TV set because it did not come with KIIR in front of the TV set.Also, in terms of operability, for example, when watching TV images and text multiplex signals at the same time, such as during teletext broadcasting, If you don't always adjust the two volumes, the lance will be out of alignment, which is very complicated and difficult to understand, resulting in poor operability.Therefore, the purpose of this invention is to improve the operability of the nine-meter CV for image adjustment. An object of the present invention is to provide a color television receiver that can improve the quality of the volume, reduce the volume installation space, and reduce costs.
In a television receiver that has input signals of two signal systems, such as TV signals such as PAL and SECAM systems and RGB system,
Image control such as adjustment of image contrast and brightness is characterized by the fact that it is performed by a common adjuster for both the NTSC television signal system and the RGB signal system.

An embodiment of the invention is shown in the drawings. That is, in this color television receiver, the output terminals of the NTSC system processing circuit M and the RGB system processing circuit M2 are connected to a signal switch S, the signal switch S is connected to the cathode ray tube CRT K, and the contrast volume VR and A bright volume VR2 is commonly connected to the processing circuits y and 1M2, and these circuits M.

It controls M2.

To explain the operation, RGB system (digital) signal R,
G, B, negative polarity, transistor Tr of circuit M2~T
It is input to the pace of r3, and its amplitude is changed by the voltage whose impedance is converted by the transistor T r I7 from the contrast volume VR. next.

The voltage is passed through the DC cut capacitors C to C3 and input to the base of the impedance conversion circuit of transistors Tr4 to Tr6, where the voltage is impedance converted by the transistor TrB from the plate volume vR2.

A clamp is applied by the transistor T r e . The output signal of this circuit M2 is supplied to the cathode ray tube CRT through the signal switch St. The circuit M1 processes the NTSC system signal with a chroma processing IC circuit IC, and uses the outputs of the volume VR□ and VR2 to control the contrast. It is controlled by Q and light control unit Q2't, and is supplied to the cathode ray tube CRT by switching the signal switch and switch S.

As described above, the color television receiver of the present invention processes NTSC and RGB television signals as input signals, and is provided with a common image control adjuster for each processing circuit. Ninth, improved operability, reduced installation space by halving the number of volumes,
This has the effect of reducing costs.

[Brief explanation of the drawing]

The drawing is a circuit diagram of an embodiment of the present invention. CRT: Braun tube, M: RGB signal processing circuit.

Claims (1)

[Claims] a signal switch connected to the plaquen tube; an NTSC signal processing circuit that supplies an output signal to the plaquen tube through the signal switch; and a signal switch that supplies the signal to the plaquen tube by a switching operation of the signal switch. The RGB system signal is also a logical circuit and the NTSC system! !
A color television receiver comprising: a controller which is commonly inserted into a signal processing circuit and an RGB signal processing circuit to control the contrast, brightness, etc. of the image of the plaque tube displayed through the signal switch.