Method of slewing a digital filter providing filter sections...

Details Method of slewing a digital filter providing filter sections... Method of slewing a digital filter providing filter sections...

2006-04-25

2006-04-25

Patel, Jay K. (Department: 2637)

Pulse or digital communications

Equalizers

Automatic

C708S300000, C708S320000

Reexamination Certificate

active

07035328

ABSTRACT:
A method is provided of slewing a bandwidth characteristic of a digital filter within a range between a first bandwidth characteristic and a second bandwidth characteristic. The digital filter includes a plurality of cascaded filter sections, each filter section being comprised of a second order filter having coefficients a1, a2, b0, b1, and b2. An index value is determined for identifying a desired bandwidth characteristic within the range. Values are interpolated for the coefficient values for the a1and a2coefficients of a respective filter section in response to the index value. Coefficient values are derived for the b0, b1, and b2coefficients in response to the coefficient values for the a1and a2coefficients such that the b0, b1, and b2coefficient values provide a matched gain for the respective filter section. The coefficient values are loaded into the respective filter section.

REFERENCES:
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patent: 6154547 (2000-11-01), Whitecar
patent: 6263354 (2001-07-01), Gandhi
Robert Bristow-Johnson , “The equivalence of various methods of computing bi-quad coefficients for audio parametric equalizers.” Wave Mechanics Inc. originally published Nov. 1994, 97thConvention of the Audio Engineering Society.

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