MATLAB: How to filter multichannel data for Adaptive Filters in MATLAB 7.5 (R2007b)

adaptfiltadaptivedesignfilterFilter Design Toolboxmultichannelswftf

I want to implement a multichannel adaptive filter (swftf) receiver. However the filter function in the Filter Design Toolbox does not support multichannel data for Adaptive Filters.

Best Answer

The FILTER function in the Filter Design Toolbox does not support multichannel data for Adaptive Filters. It is supported only for Fixed-Point Filter and Multirate Filter Syntaxes.

A workaround for this would be to loop through each channel to process the data.

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MATLAB: Fir and iir filtering

You have to know your filter specifications. If you do, you can do both with fdesign.lowpass and fdesign.highpass

fdesign.lowpass and fdesign.highpass have different specification strings which support different filter designs.

The default string 'Fp,Fst,Ap,Ast' supports both FIR and IIR designs.

Here is an example:

Design a lowpass filter with a passband frequency of 1 kHz, a stopband frequency of 1.5 kHz, passband ripple of 0.5 dB, and stopband attenuation of 40 dB. The sampling frequency is 20 kHz

   d = fdesign.lowpass('Fp,Fst,Ap,Ast',1e3,1.5e3,0.5,40,20e3);
   designmethods(d)  %shows which designs are valid for this spec
   Hdeq = design(d,'equiripple'); % FIR filter
   Hbutt = design(d,'butter'); %IIR design

MATLAB: How to set the UIGETFILE filter in MATLAB 7.5 (R2007b)

To set the filter specification in MATLAB 7.5 (R2007b), the filter term(s) must have a file extension. Any extension will be accepted for a filter, even the wildcard character . If no extension is provided, the UIGETFILE filter will reset back to the default '.*'. To achieve the desired results, use the following code:

Filter = '*2007*.*';
DefaultFileName = 'log.mat';
Title = 'Title';
uigetfile(Filter,Title,DefaultFileName);

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MATLAB: Fir and iir filtering

MATLAB: How to set the UIGETFILE filter in MATLAB 7.5 (R2007b)

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