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ButterParam

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ButterParam - Fast parameters for a digital Butterworth filter

The calculation of filter parameters with BUTTER is expensive. Therefore ButterParam stores calculated parameters in a lookup-table to accelerate repeated calls with the same input.
Example:
x = rand(10000, 1); % test data
[B, A] = butter(3, 0.6);
y = filter(B, A, x);
The relation of the processing times is: BUTTER=68% / FILTER=32%!
With [B, A] = ButterParam(3, 0.6) we get: ButterParam=14% / FILTER = 86%, and the both calls together use 35% of the version with BUTTER.

Input and output equal the BUTTER command of the Signal-Processing-Toolbox
when used with 3 inputs and 2 outputs:
[B, A] = ButterParam(N, Wn, Pass)
INPUT:
N: Order of the filter.
Wn: Cutoff frequency, scalar or [1x2].
Pass: Optional, 'low', 'high', 'bandpass', 'stop'.

OUTPUT:
B, A: Coefficients for FILTER.

Free download from Shareware Connection - ButterParam - Fast parameters for a digital Butterworth filter

Publisher: Jan Simon | License: Freeware | Price: 0.00
Version: 1.0 | Size: 10 KB | Platform: Matlab, Scripts
Released Date: 14-05-2013 | Rating: 0 | Title: ButterParam

Author Url: http://www.mathworks.com
Program Info Url: http://www.mathworks.com
Download Url: http://www.mathworks.com/matlabcentral/fx_files/30247/1/ButterParam_30Jan2011.zip

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Shareware Connection periodically updates pricing and software information of 'ButterParam' from company source 'Jan Simon' , so some information may be slightly out-of-date. You should confirm all information before relying on it. Software piracy is theft,  Using 'ButterParam' crack, password, serial numbers, registration codes, key generators is illegal and prevent future development of ButterParam.

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