Signal detecting circuit

Details Signal detecting circuit Signal detecting circuit

1984-02-21

1985-04-02

Miller, Stanley D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328147, 328151, 358 10, H03D 300, H03K 522, H03K 500, H03N 962

Patent

active

045090165

ABSTRACT:
A signal detecting circuit detects the presence in an input signal of a component of a predetermined frequency f.sub.p. The circuit includes a sampling arrangement for sampling the input signal at predetermined times separated by a sampling period 1/f.sub.s and providing first, second, and third signal samples. An adding circuit provides a sum signal A+C from the first and third signal samples, and a calculating circuit provides a calculated signal 2B cos .theta. from the second signal sample, where .theta. is the phase relation of the signal samples 2.pi.f.sub.s /f.sub.p. A comparator provides an output signal when the values of the sum signal A+B and the calculated signal 2B cos .theta. are substantially equal, indicating the presence of the component of interest.

REFERENCES:
patent: 3866151 (1975-02-01), Tajima et al.
patent: 3906377 (1975-09-01), Harris
patent: 4109109 (1978-08-01), Molleron

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