wfir
linear-phase FIR filters
Syntax
[wft,wfm,fr]=wfir(ftype,forder,cfreq,wtype,fpar)
Arguments
- ftype
string :
'lp','hp','bp','sb'
(filter type)- forder
Filter order (pos integer)(odd for
ftype='hp'
or'sb'
)- cfreq
2-vector of cutoff frequencies (
0<cfreq(1),cfreq(2)<.5
) onlycfreq(1)
is used whenftype='lp'
or'hp'
- wtype
Window type (
're','tr','hm','hn','kr','ch'
)- fpar
2-vector of window parameters. Kaiser window
fpar(1)>0 fpar(2)=0
. Chebyshev windowfpar(1)>0, fpar(2)<0
orfpar(1)<0, 0<fpar(2)<.5
- wft
time domain filter coefficients
- wfm
frequency domain filter response on the grid fr
- fr
Frequency grid
Description
Function which makes linear-phase, FIR low-pass, band-pass, high-pass, and stop-band filters using the windowing technique. Works interactively if called with no arguments.
Examples
[h,hm,fr]=wfir("lp",33,[.2 0],"hm",[0 0])
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