remez1 Parks-McClellan optimal FIR filter design b = remez1 (n, f, a) b = remez1 (n, f, a, w) b = remez1 (n, f, a, w, ftype) b = remez1 (n, f, a, w, ftype, griddensity) n: gives the number of taps in the returned filter f: gives frequency at the band edges [b1 e1 b2 e2 b3 e3 …] a: gives amplitude at the band edges [a(b1) a(e1) a(b2) a(e2) …] w: gives weighting applied to each band ftype: is "bandpass", "hilbert" or "differentiator" griddensity: determines how accurately the filter will be constructed. The minimum value is 16, but higher numbers are slower to compute. Frequency is in the range (0, 1), with 1 being the Nyquist frequency.