ButterParam 1.0

ButterParam - Fast parameters for a digital Butterworth filterThe 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-Toolboxwhen 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.

Requirements:	No special requirements
Platforms:	Matlab
Keyword:	Bandpass,  Butterinput,  Butterparam,  Butterparamn,  Coefficients,  Command,  Equal,  Filter,  High,  Inputs,  Low,  Optional,  Output,  Outputsb,  Passinput,  Signalprocessingtoolboxwhen,  Stop,  Version
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