DEVICE FOR SEPARATION OF BRIGHTNESS AND COLOR SIGNALS IN DECODER OF SECAM TYPE Russian patent published in 1994 - IPC

FIELD: television. SUBSTANCE: device has unit 1 for separation of full color video signal into high- frequency and low-frequency constituents, five delay units 2, 6, 7, 9, 16, adder 3, phase detector 4, phase-modulated signal generator 5, two multipliers 8 and 11, low-pass filter 10 having tunable band of pass, generator 12 for generation of complex envelope of frequency-modulated signal, detector 13 for detection of complex envelope of frequency-modulated signal, signal differentiating unit 14, non-linear converter 15, subtraction unit 17. Device provides possibility for tracing separation of signal color and corresponding tracing rejection of brightness signal spectrum. Device also changes brightness range dynamically depending on range of jumps of color signal frequency. In addition negative feedback depending on frequency and control in feedback loop result in more effective separation of signals because the level of suppression of mutual interference between signals is achieved with less distortion of separated signals. EFFECT: decreased distortion of separated color and brightness signals. 1 dwg