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

FIELD: television. SUBSTANCE: the device has low-pass filter 1, seven delay units 2, 4, 6, 10, 11, 14, 22, adder 3, two subtracters 5, 7, phase discriminator 8, phase-modulated signal generator 9, five multipliers 12, 13, 16, 21, 24, two retunable low-pass filters 15, 23, two FM signal complex envelope generators 17, 25, two FM signal complex envelope detectors 18,26, two signal differentiation units 19, 27, two control signal generators 20, 28. The use of different laws of control of band-widths of follow-up filters in brightness and color channels in combination with the use of frequency feedback determines the optimum laws of variation of band-widths in these channels with variation of the values of frequency surges in frequency feedback loops, thus enhancing the quality of separation of brightness and color signals. EFFECT: decreased distortions of images of brightness and color signals. 1 dwg