Frequency detection circuit

Details Frequency detection circuit Frequency detection circuit

1995-02-15

1997-03-18

Regan, Maura K.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 7631, 324 7646, H04L 2722

Patent

active

056126174

ABSTRACT:
A circuit for detecting a particular frequency out of a signal coming in over a telephone line or similar communication path. The circuit has not only a band-pass filter having a frequency band to be detected but also band-pass filters covering frequency bands adjoining. A particular frequency is detected on the basis of the results of comparison of the output levels of the band-pass filters and reference levels.

REFERENCES:
patent: 4385208 (1983-05-01), Tow
patent: 4492917 (1985-01-01), Inami
patent: 4718097 (1988-01-01), Uenoyama
patent: 4797931 (1989-01-01), Furukawa
patent: 4904930 (1990-02-01), Nicholas
patent: 5075619 (1991-12-01), Said

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