buttmag

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.