FIR filter coefficients

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Talha 2011-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/10964-fir-filter-coefficients

回答： Veera Kanmani 2018-4-20

hi,

I am trying to implement digital FIR filter in my DSP kit.I know the order, sampling frequency and my signal bandwidth. I want to design Multi band pass filter.

Currently I am working on "fdatool" in Matlab for FIR filter designing. I am trying to make two filter convolve and then get the desired results. One LPF and other bandpass. I successfully get the coefficients in the Matlab workspace and the result of convolution is to some extent satisfactory but the problem is I don't know anything about the filter structure that is used by the original source codes. Cause when I copied the coefficients from the source file and then implemented it Matlab the result was as expected, but when I change the filter structure like Direct or Transpose or anything, nothing happens as oppose to my designed filters whose respone changes as I change the structure.

What could be the reason for that...

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Honglei Chen 2011-7-7

Hi Talha,

Did you try to look at the response of filter before you burnt the code? Do you see a notch at 50Hz? In addition, do you really have to do it in an FIR filter? From your spec, I'd try a notch filter rather than cascading a lowpass and a bandpass together. Type the following command for details if you have Filter Design Toolbox or DSP System Toolbox.

help fdesign.notch

Talha 2011-7-8

yes the response was pretty close to good actually. The notch was at 50 Hz. and Yes I require a FIR cause its the only one that is supported by the DSP. And a notch is only available in IIR.

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