DIGITAL DEVICE FOR LUMINANCE/CHROMINANCE SIGNAL SEPARATION IN SECAM DECODER

摘要

FIELD: television engineering. SUBSTANCE: device has analog-to- digital converter, unit 2 for separating complete video signal into low-frequency and high-frequency components, two delay units 3,6, adder 4, two digital-to-analog converters 5,21, subtracter 7, high-frequency predistortion corrector 8, four multipliers 9,11,18,20, two follow-up band filters 10,19, frequency control provision, two complex frequency- modulated signal generators 13,22, high-frequency predistortion unit 14, two signal-differentiating units 15, 23, two control-signal shapers 16,24, two complex-signal frequency detectors 17,25. EFFECT: reduced distortion of luminance and crominance signals due to frequency transfer of high-frequency components of full video crominance signal in combination with use of various mechanisms of follow-up band filter control in luminance and crominance channels, as well as use of frequency feedback enabling setting of optimal mechanisms of band-pass variations in these channels depending on peak-to-peak frequency variations in feedback loops. 1 dwg