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# Discussion Groups | Matlab DSP | recursive frequency sampling filter design

Dear all, I am working on the recursive frequency sampling filter design. My confusion is, I read the theory saying that as it contains the poles.and also exactly pole zero cancellation occurs to give the stability...

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# recursive frequency sampling filter design - Appalayagari Sreedhar - Jan 12 8:33:00 2003

 Dear all, I am working on the recursive frequency sampling filter design. My confusion is, I read the theory saying that as it contains the poles.and also exactly pole zero cancellation occurs to give the stability. in case of fir filter using remez or any, we get only the b coefficients and a coefficients are assumed to be[1 rest all zeros]; using tf2zp we can get zeros. in the recursive frequency sampling filter case how can i get the zeros and poles in the frequency sampling filter design .because i dont know how to get the b and a coefficients. i want to know how can i calculate the numerator and denominator coefficients.using matlab. and also to do the quantisation i needed to reduce the radius(r) to make exact pole zero cancellation. I will be waiting for all your responses. regds,sree.

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# Re: recursive frequency sampling filter design - navaneetha krishnan - Jan 16 15:39:00 2003

 Hi, Setting format long does not affect the precision of the coefficients. It affects only how it is displayed on the screen. By default the coefficients will be in double precision (64 bits). To do finite precision analysis, you can use either the fdatool or qfilt. Both are available in filterdesign toolbox. Regards Navan --- Appalayagari Sreedhar <> wrote: > Dear all, > > my problem straight away, > > i am doing recursive frequency sampling filter > design, > > in matlab i design the filter coefficients, i gave > the format long at the top and received the 15 > digits for representation after decimal point. > > does this give the precision value for how many bits > is it 64 or 32 bits i want to do finite wordlength > effects, in my project i hope u all might have > worked on this i will be expecting your valuable > suggestions, > > regds,sree. __________________________________________________
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