IIR Filter Design Using MATLAB

I. IIR Filter Order Selection ※ IIR Filter는 Filter 차수를 임의로 정하는 것이 아니라 Filter의 Spec에 따라 최적의 Filter 차수를 결정하여 사용해야 한다. 1. buttord - Butterworth Filter order selection ▶ 기본 형태 [n,wn] = buttord(wp, ws, Rp, Rs) n : IIR Filter order wn : Normalized Cutoff Frequency (where, 1 corresponds to radians/sample) wp : Normalized Passband Edge Frequency (where, 1 corresponds to radians/sample) ws : Normalized Stopband Edge Frequency (where, 1 corresponds to radians/sample) Rp : Passband Ripple (Rp dB) Rs : Stopband Attenuation (Rs dB) For example, Lowpass : wp = 0.1, ws = 0.2 Highpass : wp = 0.2, ws = 0.1 Bandpass : wp = [0.2 0.7], ws = [0.1 0.8] Bandstop : wp = [0.1 0.8], ws = [0.2 0.7] 2. Cheb1ord / Cheb2ord - Chebyshev Filter Type I / Type II order selection ▶ 기본 형태 [n,wn] = cheb1ord(wp, ws, Rp, Rs) % Type I [n,wn] = cheb2ord(wp, ws, Rp, Rs) % Type II n : IIR Filter order wn : Normalized Cutoff Frequency (where, 1 corresponds to radians/sample) wp :…
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