KR920014247A - Synthesis Synchronization Signal and Digital Data Separation System from Composite Image Signal - Google Patents

Abstract

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Description

Synthesis Synchronization Signal and Digital Data Separation System from Composite Image Signal

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FIG. 2 (a) is a block diagram of the synthesized synchronous signal and digital data separation system from the synthesized signal of the present invention. FIG. 2 (b) is a block diagram of the synthesized synchronous signal (horizontal synchronous signal) separator. A block diagram of the synchronous signal separator, FIG. 3 (d) is a block diagram of a digital data separator, and FIG. 3 is an angular waveform diagram according to an embodiment of the present invention, and digital can be obtained.

Claims (4)

A clamping circuit (1) for clamping the input composite video signal, a composite synchronous signal separator (2) for separating the composite synchronous signal from the composite video signal clamped by the clamping circuit, and a composite synchronous signal including horizontal and vertical synchronous signals Synthesized from a composite video signal characterized in that it comprises a vertical synchronous signal separator (5) for separating the vertical synchronous signal, and a digital data separator (7) for separating the digital data by generating a gate pulse from the synthesized synchronous signal and the vertical synchronous signal. Synchronous signal and digital data separator system. 2. The synthesized synchronous signal separator (2) according to claim 1, comprising: a low pass filter (8) for passing a data signal and removing color image signals, a buffer circuit (9) for outputting a low pass composite video signal as an output; A level shift circuit 10 for level shifting the output of the buffer circuit, a peak value detection circuit 11 for level shifting to detect the peak value, and a peak value detection value of the output of the buffer circuit and the peak value detection circuit Synthetic synchronous signal and digital data separation system from a composite video signal, characterized in that consisting of a first comparator (3). 2. The second low pass filter 12 of claim 1, wherein the vertical synchronous signal separator 5 separates the vertical synchronous signal by passing only low frequency components from the synthesized synchronous signal output from the synthesized synchronous signal separator 2. And a second comparator (13) for separating the vertical synchronous signal by comparing the output of the positive filter and the reference voltage (15: V _ref ) with the synthesized synchronous signal and digital data separation system. 2. The gate pulse generator as claimed in claim 1, wherein the digital data separator (7) generates a gate pulse only during a period of digital data from the synthetic synchronous signal from the synthetic synchronous signal separator and the vertical synchronous signal from the vertical synchronous signal separator. (6) and a third comparator 14 for inputting the synthesized synchronous signal output from the synthesized synchronous signal separator and outputting the gate pulse locator digital data from the gate pulse generator 6; Synthesis synchronous signal and digital data separation system from composite video signal. ※ Note: The disclosure is based on the initial application.