Video switch circuit

Abstract

The invention provides a video switching circuit, comprising a control module and three switch modules (K1), (K2) and (K3); wherein, the input of the (K1) is connected with the output of the Y / G signal of the DVD decoder chip; two ports of the output are respectively connected with the Y input of the chromatic aberration variable port of the television and the S_G input of the SCART port of the television; the input of the (K2) is connected with the output of the U / B signal of the DVD decoder chip; two ports of the output are respectively connected with the U input of the chromatic aberrationvariable port of the television and the S_B input of the SCART port of the television; the input of the (K3) is connected with the output of the V / R signal of the DVD decoder chip, and two ports of the output are respectively connected with the V input of the chromatic aberration variable port of the television and the S_R input of the SCART port of the television; the control module is respectively connected with the control ports of the (K1), (K2) and (K3) to receive the SCART_CON signal, and the SCART_CON signal controls the (K1), (K2) and (K3) to choose the chromatic aberration variable port or the SCART port communicated with the television.

Description

technical field [0001] The invention belongs to the field of video technology, in particular to the technology of video switching. Background technique [0002] In the DVD industry, certain certifications (such as DVD Macrovision certification) require that: when a DVD player (also including a DVD recorder) has RGB signals (SCART ports, European TV audio and video interfaces) and YUV signals (component port) video When outputting, the RGB signal cannot be output from the color difference component port, and the YUV signal cannot be output from the SCART port. [0003] However, since the YUV / RGB signals of all DVD decoding schemes share a set of video digital-to-analog conversion, that is, the RGB signals will be output from the component ports, and the YUV signals will also be output from the SCART ports. [0004] Please refer to FIG. 1 , which is a block diagram of an existing DVD with a video switching control function. This solution is to make the DVD meet the requireme...

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a video switching circuit, aiming at solving the problem of high cost of DVD video switching circuit in the prior art

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