CHROMINANCE DEMODULATION WITH SAMPLING OF THE INPUT SIGNAL AT THREE TIMES THE COLOUR SUBCARRIER FREQUENCY

摘要

In a method of demodulating chrominance signals, input signals (CVBS) are sampled at three times the color subcarrier frequency to obtain sampled signals. The sampled signals are demodulated (Du, Dv) at demodulation angles with respect to the color subcarrier phase which demodulation angles differ by 360 DEG /(3*2<n>), with n being 0, 1 or 2, preferably at demodulation angles of 0 DEG and 120 DEG with respect to the color subcarrier phase, to obtain demodulator output signals (2U/ 2ROOT 3; -U/ 2ROOT 3 + V). The demodulator output signals (2U/ 2ROOT 3; -U/ 2ROOT 3 + V) are matrixed (Mx) to obtain demodulated chrominance signals (U, V).