Adaptive stop-notch filter

Details Adaptive stop-notch filter Adaptive stop-notch filter

H - Electricity

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H03H 11/04 (2006.01) H03H 17/04 (2006.01) H03H 21/00 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 1251527

ADAPTIVE STOP-NOTCH FILTER 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 sup- pression of energy at the time varying or en semble 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.

520182

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