KR940004806Y1 - Apparatus for transforming multi rgb color signal - Google Patents

Abstract

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Description

Inverter for multi-R.G.B output

1 is a block diagram of a conventional R. G. B conversion circuit.

2 is a block diagram of the present invention configured for multiple R. G. B output.

3 is a timing diagram of a multi-R.G.B converter.

* Explanation of symbols for main parts of the drawings

B: R. G. B conversion circuit C: Switch

D: Interface Circuit 1: A / D Converter

2: memory 3: D / A converter

4: Timing Clock Generator

The present invention relates to a conversion device for multi RG B output, and in particular, it is not necessary to adjust color, horizontal and vertical synchronization according to the conversion of NTSC composite signal and RGB input signal, and simply configures a synchronization circuit to reduce production costs. The focus is on what we want to save.

Generally, NTSC composite signal and RGB signal input are used as the signal input. NTSC composite signal input terminal is connected to video output terminal such as TV or VTR, and RGB input terminal is connected to output terminal of PC (Program Control).

Therefore, when constructing a system using a PC, a TV, and a VTR, an interface in which a separate RGB conversion circuit (B), a switching switch (C), and an RGB input signal of the PC are applied to the monitor as shown in FIG. It consists of a circuit (d).

In this regard, NTSC composite signals such as TVs and cameras are demodulated by RGB conversion circuits (b) and converted into RGB signals, and RGB signals from PCs are interfaced between digital RGB signals and TV color output terminals. Is converted.

Therefore, two RGB signals were selected by the changeover switch (c), and color sync signal, horizontal sync, vertical sync, etc. were adjusted for each RGB signal.

However, such a conventional circuit requires an adjustment of a different synchronization signal because an RGB output signal is generated by the changeover switch (c), and thus a synchronization circuit used to adjust the synchronization signal is very complicated and thus increases production costs. It was a problem that made them difficult to keep up with the exact motivation.

The present invention is to solve the conventional problems as described above by configuring a simple circuit to enable the synchronization as a clock generator to enable accurate synchronization adjustment. More specifically, the NTSC composite signal, NTSC color signal, video signal, and synchronization signal are converted into RGB signals by the processing clock generator, and the RGB signals in the PC and the like are converted to standard RGB levels by the digital RGB signal interface circuit. The purpose is to make it as possible.

Hereinafter, the present invention in detail according to the accompanying drawings.

As shown in FIG. 2, an RGB conversion circuit (B) for demodulating and converting an NTSC composite signal into an RGB signal, an interface circuit (D) for converting an RGB signal, and two RGB signals are selected to each RGB signal. A RG B conversion circuit comprising a switching switch (C) for adjusting a color synchronous signal, a horizontal synchronous signal, a vertical synchronous signal, and the like, wherein the RGB conversion circuit (B) and the switching switch (C) are connected to the read and write signals of the memory. The timing clock generator 4 and the A / D converter 1 are connected to each other when the timing clock generation 4 generating the control signal and the A / D converter 1 for digitally converting the converted RGB signal are connected. Connecting and recording a memory 2 for sampling the selected RGB signal therebetween, and converting the digital signal into an analog signal between the memory 2 and the timing clock generator 4 to reproduce twice the RGB signal. The D / A converter (3) is connected and configured .

When described in detail according to Figure 2 the effect of the present invention configured as described above. First, the NTSC composite signal selected by the changeover switch (c) demodulates the signal by the RGB conversion circuit (b) and outputs a horizontal vertical drive signal. Since the RGB conversion circuit (b) is a color difference output format, it is configured in a matrix format using a transistor (not shown in the drawing) and outputs an RGB signal.

As described above, the RGB signal output by the RGB conversion circuit (b) is input to the switching switch (c) to adjust and output the RGB signal to an appropriate level.

In this state, the A / D converter 1 uses a low-pass filter (not shown in the figure) to filter the RGB signal selected by the switching switch (C) to a frequency of 1/2 or more sampling frequencies, respectively, to a clock of 14 and 3MHZ. The converted 8-bit digital signal is input to the memory 2 by conversion. Thus, in the memory 2, the input 8-bit digital signal is recorded, and then twice the frequency is read and input to the D / A converter 3.

Here, the control signal of the memory 2 is supplied from the timing clock generator 4, and the timing diagram is as shown in FIG.

Therefore, the D / A converter 3 converts an 8-bit digital signal input to the D / A converter into a double clock to reproduce double compressed RGB signals.

In this way, the present invention can be synchronized by simple circuit configuration without the need to adjust the color synchronization, horizontal synchronization, vertical synchronization, etc. according to the switching of NTSC composite signal and RGB input signal, or double compressed RGB output as an interface method. You will be able to get.

Claims (1)

RG B conversion consisting of an RGB conversion circuit (B) for demodulating NTSC complex signals and converting them into RGB signals, an interface circuit (R) for converting RGB signals, and a switching switch (C) for selecting and switching two RGB signals. In the circuit, an A / D converter for converting the converted RGB signal into a digital signal at the timing clock generation (4) of generating a memory lead, a write signal, and a control signal in the RGB conversion circuit (b) and the switching switch (c). (1) are connected to each other, and the timing clock generator 4 and the A / D converter 1 are connected to and connected to a memory 2 for recording for sampling the selected RGB signal, and the timing clock generator ( 4) A converter for multiple RC B outputs, characterized in that it is connected by connecting a D / A converter (3) which converts an analog signal into a digital signal and reproduces a double RGB signal.