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Ajuda do Scilab >> Processamento de Sinais > filters > yulewalk

yulewalk

least-square filter design

Calling Sequence

Hz = yulewalk(N,frq,mag)

Arguments

N

integer (order of desired filter)

frq

real row vector (non-decreasing order), frequencies.

mag

non negative real row vector (same size as frq), desired magnitudes.

Hz

filter B(z)/A(z)

Description

Hz = yulewalk(N,frq,mag) finds the N-th order iir filter

n-1         n-2
B(z)   b(1)z     + b(2)z    + .... + b(n)
H(z)= ---- = ---------------------------------
n-1       n-2
A(z)    z   + a(2)z    + .... + a(n)

which matches the magnitude frequency response given by vectors frq and mag. Vectors frq and mag specify the frequency and magnitude of the desired frequency response. The frequencies in frq must be between 0.0 and 1.0, with 1.0 corresponding to half the sample rate. They must be in increasing order and start with 0.0 and end with 1.0.

Examples

f=[0,0.4,0.4,0.6,0.6,1];
H=[0,0,1,1,0,0];
Hz=yulewalk(8,f,H);
fs=1000;
fhz = f*fs/2; 
clf(0);
xset('window',0);
plot2d(fhz',H');
xtitle('Desired Frequency Response (Magnitude)')
[frq,repf]=repfreq(Hz,0:0.001:0.5);
clf(1);
xset('window',1);
plot2d(fs*frq',abs(repf'));
xtitle('Obtained Frequency Response (Magnitude)')
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Last updated:
Fri Apr 11 14:18:12 CEST 2014