Tone signal detecting circuit

Details Tone signal detecting circuit Tone signal detecting circuit

1991-09-06

1993-02-23

Ng, Jin F.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328140, 307231, H03K 906, H03K 522

Patent

active

051893789

ABSTRACT:
A tone signal detecting circuit includes a sampling circuit, a storage circuit, and a comparing circuit. The sampling circuit samples a tone signal at a sampling rate N times (N is a natural number) higher than a frequency f of the one signal. The storage circuit stores M (M is a natural number) latest values of time series data from the sampling circuit. The comparing circuit compares a plurality of polarity patterns expected on the basis of a tone signal with polarity patterns stored in the storage circuit and outputting coincidence outputs.

REFERENCES:
patent: 4127824 (1978-11-01), Bennett, Jr.
patent: 4312044 (1982-01-01), Baba
patent: 4675612 (1987-06-01), Adams et al.
patent: 4747131 (1988-05-01), Beirne
patent: 4748438 (1988-05-01), Mickeal
patent: 4868872 (1989-09-01), Roberts et al.

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