remez

remez — Remez's algorithm

Calling sequence

[an]=remez(nc,fg,ds,wt)

`nc`	: integer, number of cosine functions
`fg,ds,wt`	: real vectors
`fg`	: grid of frequency points in [0,.5)
`ds`	: desired magnitude on grid `fg`
`wt`	: weighting function on error on grid `fg`

minimax approximation of a frequency domain magnitude response. The approximation takes the form



 h = sum[a(n)*cos(wn)]

for n=0,1,...,nc. An FIR, linear-phase filter can be obtained from the the output of remez by using the following commands:



                 hn(1nc-1)=an(nc-12)/2;
                 hn(nc)=an(1);
                 hn(nc+12*nc-1)=an(2nc)/2;

where an = cosine filter coefficients