This function returns the modulus of frequency response of function H.
Frequently H will be a FIR filter.
If H = [h0 h1 h2 ... h(M-1)] then your Z transform is:
M2=floor(M/2);
$H[Z] = h0 Z^{+M2} + h1 Z^{+M2-1} + ... h(M-1) Z^{+M2-(M-1)}$
and the function return $AH=|H[Z=e^{jW}]|$ for W from 0 to pi.
After starting the main routine just type the following command at the
prompt:
AH=freqmod(H,N)
[AH FREQN]=freqmod(H,N);
Input:
H is a vector with the parameters of H function.
N is the number of analysis points in the frequency response.
Output:
AH is the modulus of frequency response of function H.
$AH=|H[Z=e^{jW}]|$ for W from 0 to pi.
FREQN [OPTIONAL] is the normalized frequency of points in AH, thus for the
point AH(id) we have W=FREQN(id)*pi.
For help, bug reports and feature suggestions, please visit:
http://nongnu.org/bsltl/
Package: bsltl
