Demodulator for color television signals including a sub-carrier

Details Demodulator for color television signals including a sub-carrier Demodulator for color television signals including a sub-carrier

1985-09-24

1987-10-13

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

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H04N 966

Patent

active

047002166

ABSTRACT:
A phase lock loop demodulator has its loop transfer function (F(s)) optimized to: F(s)=A+B/s+CF.sub.1 (s)+DF.sub.2 (s) where CF.sub.1 (s) is a chrominance sub-carrier term DF.sub.2 (s) is a sound sub-carrier term and A, B, C and D are constants whereby to minimize the phase error signal appearing at the output of the phase comparator (10) of the loop. An equalizer circuit (14) may be added at the output of the loop in which case the transfer function (F.sub.T (s)) of the equalizer circuit is as follows: F.sub.T (s)=KoKd+s/F(s) where F(s) is the transfer function of the loop amplifier circuit (12) and A, Ko and Kd are constants.

REFERENCES:
patent: 3626301 (1970-05-01), Develet
Gardner, A Multifilter Phase-Lock Loop, Oct. 1971, IEEE Trans on Communication Technology, vol. COM-19, No. 5, pp. 669-675.

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