Method and apparatus for generating decoupled filter parameters

Details Method and apparatus for generating decoupled filter parameters Method and apparatus for generating decoupled filter parameters

1995-11-17

1997-11-11

Elmore, Reba I.

Boots, shoes, and leggings

36472406, G06F 1710

Patent

active

056871040

ABSTRACT:
A method (100) and data processing system (120) for filtering unfiltered signals (134) to produce filtered signals (136) in accordance with desired filter control parameters (124). Adjusted filter control parameters (130) are generated based upon user provided filter control parameters (124) and operational characteristics (128) of a filter (132) to be implemented. The adjusted filter control parameters (130) are provided to the filter (132) which filters the unfiltered signal (134) to produce the filtered signal (136). Using the adjusted filter control parameters (130), the filter (132) has a filtering function that agrees with the desired filter control parameters (124) to effectively band decouple the filter from bands of surrounding filters. A graphic equalizer (250) implements a multi-band digital filter function that substantially reduces the effects of interband coupling, producing a more accurate match to the original filter response specification.

REFERENCES:
patent: 5400247 (1995-03-01), He
patent: 5524022 (1996-06-01), Kihara et al.
patent: 5530660 (1996-06-01), Sun et al.
Motorola, Inc., "Digital Stereo 10-Band Graphic Equalizer Using the DSP56001," 1988, pp. 1-21.
Bohn, Dennis A., "Constant-Q Graphic Equalizers,"J. Audio Eng. Soc., vol. 34, No. 9, Sep. 1986, pp. 611-626.
JBL, Inc., "1/3 Octave Equalization and The JBL/UREI 5547A and 5549A," Technical Notes vol. 2, No. 1A, pp. 1-12.
McNally, G. W., "Microprocessor Mixing and Processing of Digital Audio Signals," Journal of the Audio Engineering Society, Oct. 1979, vol. 27, No. 10, p. 793-803.

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