Digital filters
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I am trying to build a band pass filter from .1 to 40 Hz, IIR or FIR, and then analyze it in matlab. Does anyone know reasonable parameters for this kind of filter (Fs=256). I am having trouble building one that has nice properties.
Thanks Kim
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Rick Rosson
il 18 Lug 2011
Hi Kim,
Do you have access to the Signal Processing Toolbox in MATLAB? If so, you can use the fdatool to design the filter very easily.
For more information:
doc fdatool
HTH.
Rick
Più risposte (2)
Gaurav Gupta
il 19 Lug 2011
Use fir1 for designing filter and freqz for viewing its frequency response
Daniel Shub
il 19 Lug 2011
Introductory DSP textbooks tend to provide formula for calculating parameters for some simple IIR filters (e.g., Butterworth). The signal processing toolbox in MATLAB provides the butter command. A first order Butterworth filter can be obtained with:
[b, a] = butter(1, [.1, 40]./128)
The parameters are: b =
0.3477 0 -0.3477
a =
1.0000 -1.3030 0.3047
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