Adaptive filter technique for suppression of wideband or offset

Details Adaptive filter technique for suppression of wideband or offset Adaptive filter technique for suppression of wideband or offset

1990-12-21

1992-03-17

Pascal, Robert J.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329319, 455266, H03D 300

Patent

active

050972219

ABSTRACT:
The adaptive filter for frequency modulation of the present invention utilizes an audio tone multiplexed into the baseband modulation spectrum as a pilot tone to control and determine the amount of adaptation of the effective and variable bandwidth of the filter for optimum selectivity and rejection of wideband interference or narrowband offset interference. The multiplexed tone is detected and the filter is adjusted according to the signal-to-noise ratio of the detected tone. A continuous and adaptive decrease or increase in bandwidth is produced to accommodate the actual signal bandwidth to achieve rejection of interference with minimum distortion. Additionally, the filter compensates for transmitter drift of center frequency. This filter may be used at radio or intermediate frequencies.

REFERENCES:
patent: 4641181 (1987-02-01), Mobley
patent: 4698598 (1987-10-01), Mobley et al.
Macario et al., "Method of Reducing the F.M. Threshold Using a Tracking Nth Filter", 06 Feb. 1970.

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