Adaptive filtering method and apparatus to compensate for a freq

Details Adaptive filtering method and apparatus to compensate for a freq Adaptive filtering method and apparatus to compensate for a freq

1996-06-07

1999-01-12

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

375350, 375375, 375333, 375376, 341100, H04B 110

Patent

active

058598812

ABSTRACT:
Frequency differences between differing clock sources are compensated for by an adaptive filtering mechanism. An amount of frequency drift between two clock sources is determined. Then, based on that amount of frequency drift, a filtering value is selected to be used in tracking the frequency drift. If the frequency drift is determined to be large, then a minimum filtering value is selected. However, if it is determined to be small, then a maximum filtering value is selected. The selected filtering value is used to adjust the address(es) of one or more data bits being transmitted and received using the two clock sources, such that the frequency drift is properly tracked.

REFERENCES:
patent: 4780844 (1988-10-01), Keller
patent: 4791386 (1988-12-01), Shiga
patent: 4847870 (1989-07-01), Butcher
patent: 4972444 (1990-11-01), Melrose et al.
patent: 5522088 (1996-05-01), Halma et al.
patent: 5757297 (1998-05-01), David et al.

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