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

FIELD: television equipment. SUBSTANCE: device has analog-to-digital converter 1, unit 2 for separation of integral color video signal into high-frequency and low-frequency constituents, two delay units 3, 6, adder 4, two digital-to-analog converters 5, 12, subtraction unit 7, high-frequency distortion correction unit 8, two multipliers 9, 11, adjustable band-pass filter 10, frequency-modulated signal generator 13 having phase automatic frequency control, integral frequency- modulated signal generator 14, high-frequency distortion filter 15, signal differentiating circuit 16, control signal generator 17, integral signal frequency detector 18. Device provides tracing selection of color signal along with frequency feedback, which decreases deviation of source signal, as well as tracing rejection of spectrum of color signal along with dynamic alterations in its band which depend on size of jumps of color signal amplitude. In addition device provides frequency shift of high-frequency constituent of integral video signal. EFFECT: decreased distortion of color and brightness signal during their separation. 1 dwg