?? f_iirinv.m
字號(hào):
function [b,a] = f_iirinv (n,Delta_F,fs)
%F_IIRINV: Design an IIR inverse comb filter
%
% Usage: [b,a] = f_iirinv (n,Delta_F,fs)
%
% Inputs:
% n = filter order
% Delta_F = 3dB radius of notches
% fs = sampling frequency
% Outputs:
% b = 1 by (n+1) numerator coefficient vector
% a = 1 by (n+1) denominator coefficient vector
%
% See also: F_IIRCOMB, F_IIRRES, F_IIRNOTCH
% Initialize
n = floor(f_clip(n,2,n));
fs = f_clip (fs,0,fs);
Delta_F = min(f_clip(Delta_F,0,Delta_F),fs/(2*n));
% Find the parameters
r = 1 - (Delta_F*pi)/fs;
b_0 = (1 + r^n)/2;
% Find the coefficient vectors
b = b_0*[1,zeros(1,n-1),-1];
a = [1,zeros(1,n-1),-r^n];
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