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Справка Scilab >> Signal Processing > Filters > wfir

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) only cfreq(1) is used when ftype='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 window fpar(1)>0, fpar(2)<0 or fpar(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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Last updated:
Tue Feb 14 15:13:23 CET 2017