Frequency discriminating device

Details Frequency discriminating device Frequency discriminating device

1981-08-12

1984-03-20

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328137, 328 25, 307243, 307524, 34082571, 3408257, H03B 1900, H04Q 300, H03K 526

Patent

active

044384050

ABSTRACT:
A frequency discriminating circuit for readily discriminating between two signals having closely adjacent frequencies in which the effects of drift of circuit elements are eliminated. A frequency mixer receives the signals to be discriminated which have closely adjacent frequencies f.sub.1 and f.sub.2 and a reference signal with a frequency of f.sub.m. A first low-pass filter coupled to an output of the mixer produces an output signal containing only frequency difference components .vertline.f.sub.1 -f.sub.m .vertline. and .vertline.f.sub.2 -f.sub.m .vertline. between the signal to be discriminated and the reference signal. The output of the first low-pass filter is passed through a second low-pass filter. A phase comparator receives the output signals from the first and second low-pass filters and discriminates the input signals in accordance with a phase difference between the output signals from the first and second low-pass filters.

REFERENCES:
patent: 3388333 (1968-06-01), Scribner
patent: 3588711 (1971-06-01), Antoszewski
patent: 3812432 (1974-05-01), Hanson
patent: 4231018 (1980-10-01), Imigawa et al.
patent: 4305061 (1981-12-01), Nakamura

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