Digital filters

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Kim
Kim 2011-7-18
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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Jan
Jan 2011-7-18
What is "nice" enough for your purpose?
Kim
Kim 2011-8-30
Thank you for your answer. I have been away. And have found the answer.

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采纳的回答

Rick Rosson
Rick Rosson 2011-7-18
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
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Kim
Kim 2011-8-30
Thank you for taking time to answer this. I was away for a bit so didn't get it.

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更多回答（2 个）

Gaurav Gupta
Gaurav Gupta 2011-7-19
Use fir1 for designing filter and freqz for viewing its frequency response
Daniel Shub
Daniel Shub 2011-7-19
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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Daniel Shub
Daniel Shub 2011-7-19
Yes, Kim said Fs=256.
Kim
Kim 2011-8-30
Thank you for this answer. I ended up using a butterworth designed in fdatool but then moved it to an mfile.

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