Digitally controlled bandwidth sampling filter-detector

Details Digitally controlled bandwidth sampling filter-detector Digitally controlled bandwidth sampling filter-detector

1980-10-16

1982-11-09

Heyman, John S.

328151, 328167, H03K 906, H03K 1716

Patent

active

043587372

ABSTRACT:
An improved sampling filter detector circuit for sampling input signals of different frequencies and providing a detect signal when the input frequency has a desired predetermined value. The circuit is suitable for use as a tone detector for continuous tone control squelch systems. The sampling filter detector substantially eliminates response to low order harmonics of the desired frequency and provides the ability to program the filter detector bandwidth by digital means without altering passive components thereby permitting reverse burst detection.

REFERENCES:
patent: 3537019 (1970-10-01), Reichard
patent: 3604947 (1971-09-01), Puthuff
patent: 3786360 (1974-01-01), Kawa
patent: 4024414 (1977-05-01), Gurry
patent: 4127824 (1978-11-01), Bennett
patent: 4319207 (1982-03-01), Gignoux

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