Digital color demodulator

Details Digital color demodulator Digital color demodulator

H - Electricity

04

N

350/68

H04N 9/64 (2006.01)

Patent

CA 1270321

ABSTRACT OF THE DISCLOSURE 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 of the signal. The digital processing circuits of this invention are all driven by the internal system clock signal generated by the second phase locked loop circuit.

545435

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