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Processing methods using adaptive threshold for removal of chroma/luminance cross-talk in quadrature-modulated subcarrier color television systems
Processing methods using adaptive threshold for removal of chroma/luminance cross-talk in quadrature-modulated subcarrier color television systems
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机译:在正交调制子载波彩色电视系统中使用自适应阈值消除色度/亮度串扰的处理方法
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摘要
A comb filter for improved cross-color reduction with improved visible diagonal resolution is provided for processing a luminance component of a quadrature modulated color subcarrier television signal in the vicinity of the color subcarrier pass band. The comb filter comprises an input and an output, and has a first path including a delay circuit for delaying the luminance component and a subtraction circuit connected between the input and the output, and has a second path including a chrominance type comb filter, a band pass filter for passing a spectrum in the vicinity of the color subcarrier pass band both being followed by a variable threshold circuit connected to the subtraction circuit. The variable threshold circuit is for inhibiting the signal in the second path below a variable threshold. The variable threshold is derived as a function of at least one of luminance diagonal transition level, chroma level and averaged luminance activity in the spectrum in the vicinity of the color subcarrier.
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