SECAM color signal processing device

Details SECAM color signal processing device SECAM color signal processing device

1990-08-30

1992-03-31

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 18, 358 23, H04N 972

Patent

active

051012650

ABSTRACT:
A SECAM chroma signal is filtered and supplied to a single axis demodulator, which demodulates first and second chroma signal components modulated with two carriers having frequencies above and below a center frequency, as well as an identification signal for discriminating the transmission order of the first and second chroma signals. An identification signal detector, supplied with the demodulated identification signal, discriminates the transmission order of the first and second chroma signals in accordance with a positive or negative polarity. A rectifier rectifies the discrimination signal, and generates an average output of the discrimination signal. A flip-flop circuit generates a switching signal representing periods of the first and second chroma signal components on the basis of the discrimination signal. An amplifier adjusts the level of the switching signal in accordance with the average output, and generates an off-set control signal. An adder adds the off-set control signal and the demodulated first and second color signals so that the first and second color signals have the same reference levels.

REFERENCES:
patent: 4246599 (1981-01-01), Sugimoto et al.
patent: 4623914 (1986-11-01), Kuribayashi
patent: 4766485 (1988-08-01), Takayama

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