IIR Filter

[Altera_Forum]

I would like to design a IIR filter that can deal with variable sampling frequency. Another way to say, the number of coefficient is changing and value is is different in real time. Is there any good book or article abt it? 

 thanks

[Altera_Forum]

Do you have access to matlab? If so I suggest that you may be able to fairly easily fit the coefficients required as polynomials. I have done this in the past and its worked very well - as long as the filter is not extremely high Q. 

 In a design I am working on I have an N=4 BPF which is dynamically programmable via NIOS2 - and I plan to fit polynomials in C and update filter coefficients accordingly