FIR filter coefficients
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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...