Howtosignalprocessing
How to use Firpm in Matlab?
If you specify an odd-valued n , firpm increments it by 1. b = firpm(n,f,a,w) uses the weights in vector w to weight the fit in each frequency band. The length of w is half the length of f and a , so there is exactly one weight per band. b = firpm(n,f,a,w) is a synonym for b = firpm(n,f,@ firpmfrf ,a,w).
How does FIrpm work?
firpm designs a linear-phase FIR filter using the Parks-McClellan algorithm [2]. The Parks-McClellan algorithm uses the Remez exchange algorithm and Chebyshev approximation theory to design filters with an optimal fit between the desired and actual frequency responses.
