buttmag - response of Butterworth filter

Calling Sequence

[h]=buttmag(order,omegac,sample)

Parameters

• order : integer : filter order
• omegac : real : cut-off frequency in Hertz
• sample : vector of frequency where buttmag is evaluated
• h : Butterworth filter values at sample points

Description

squared magnitude response of a Butterworth filter omegac = cutoff frequency ; sample = sample of frequencies

Examples

//squared magnitude response of Butterworth filter
h=buttmag(13,300,1:1000);
mag=20*log(h)'/log(10);
plot2d((1:1000)',mag,[2],"011"," ",[0,-180,1000,20])
 

Author

F. D.