Encoding circuit for a SECAM color television transmission

Details Encoding circuit for a SECAM color television transmission Encoding circuit for a SECAM color television transmission

1983-02-25

1986-03-18

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 940

Patent

active

045772177

ABSTRACT:
An encoding circuit for a SECAM color television transmission, comprising a frequency-modulatable oscillator for a modulating signal which comprises two line-sequential color difference signals, the circuit also comprising a control loop for making the quiescent frequencies in the generated frequency-modulated signal substantially equal to reference frequencies. For this purpose the control loop comprises a multiplexer, a frequency demodulator and two control paths each having two sample- and -hold circuits. The sequence of the signals conveyed by the multiplexer and the time position of the measuring intervals are chosen such that at least a line scan period is located between the quiescent frequency-measuring interval and the reference frequency-measuring interval.

REFERENCES:
patent: 4145711 (1979-03-01), Aschwanden
patent: 4327372 (1982-04-01), Van der Valk

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