Method and apparatus for digital time-variant filtering

Details Method and apparatus for digital time-variant filtering Method and apparatus for digital time-variant filtering

H - Electricity

03

H

354/138, 349/16

H03H 19/00 (2006.01) G01V 1/36 (2006.01)

Patent

CA 1199409

ABSTRACT OF THE DISCLOSURE A method and apparatus for digital time-variant filtering are disclosed. The digital time-variant filters are implemented using the Hilbert transform and a time- varying instantaneous frequency control function for cont- rolling the cutoff frequency. The digital time-variant filters are adaptable to various filtering processes, that is, as either a high-cut, low-cut, band-pass, or reject filter. The various digital time-variant filters are stable in that no unusual transients occur in the output signal; are flexible in that the cutoff frequency is cont- rolled by a selectable time-varying control function signal; and are efficient in that computational require- ments are only twice to 16 times that of known digital time-invariant filters.

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