Digital color demodulator

Abstract From the Canadian patent

This invention provides a digital color demodulator having: a first phase locked loop circuit which generates an analog subcarrier signal phase locked to the color burst signal; a second phase locked loop circuit which generates an internal system clock signal phase locked to a horizontal period; a Y/C color separation circuit operating under the internal system clock signal; a pair of multiplying circuits one of, which multiplies a digital subcarrier signal converted, from the analog subcarrier signal with the color signal, and the other of which multiplies the digital subcarrier signal, phase delayed by substantially 90° with the color, signal, thereby performing orthogonal demodulation …