Adaptive stop-notch filter

Details Adaptive stop-notch filter Adaptive stop-notch filter

1985-10-11

1987-07-07

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307520, 307529, 328160, H03B 104

Patent

active

046790012

ABSTRACT:
A filter suppresses energy at time varying or ensemble varying frequencies. The filter comprises multiplier sections having sets of values which are dynamically varied during the receipt of time varying or ensemble varying energy. The variation of the values of the multiplier sections provides the suppression of energy at the time varying or ensemble varying frequencies. The sets of values for the multiplier sections are chosen such that the poles of such values lie within the unit circle of the z-plane locus. The location of the poles within the unit circle guarantees that the filter remain stable even though the multipliers may be located in a feedback path. In the preferred embodiment, the dynamically varying filter is used in a dual tone multi-frequency (DTMF) receiver.

REFERENCES:
patent: 3531652 (1970-09-01), Aemmer et al.
patent: 3628057 (1971-12-01), Mueller
patent: 3912916 (1975-10-01), Grun et al.
patent: 3967102 (1976-06-01), McCown
patent: 4182997 (1980-01-01), Brambilla
patent: 4223272 (1980-09-01), Feistel
patent: 4349916 (1982-09-01), Roeder
patent: 4495475 (1985-01-01), Mark et al.

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