wfir

linear-phase FIR filters

Calling Sequence

[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.