buttmag

Arguments

order

integer : filter order

omegac

real : cut-off angular frequency (in rad/s)

sample

real vector of angular frequencies (in rad/s), where the transmission must be 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])