Secam chrominance signal demodulator with two red-blue channels

Details Secam chrominance signal demodulator with two red-blue channels Secam chrominance signal demodulator with two red-blue channels

1999-04-08

2000-11-21

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Chrominance signal demodulator

348727, H04N 966

Patent

active

061510807

ABSTRACT:
The SECAM chrominance signal demodulator includes an oscillator with a controlled frequency, a phase comparator with a first input connected to an oscillator output, a second input to receive a chrominance signal, and an output connected to an input loop of the oscillator. The demodulator further includes a fixed current source, also connected to the loop input, a current mirror to copy a current equal to the sum of the fixed current and a comparator output current in the output branches comprising first and second calibration resistors respectively, in series with a common resistor. Output voltages corresponding to the red and blue components of the chrominance signal are measured at the terminals of the calibration resistors respectively. The demodulator is used in television sets, for example.

REFERENCES:
patent: 4410856 (1983-10-01), van Zanten
patent: 4963831 (1990-10-01), Stuivenwold et al.
patent: 5726714 (1998-03-01), Maldonado
patent: 5838395 (1998-11-01), Brilka

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