wfir - linear-phase FIR filters

Calling Sequence

[wft,wfm,fr]=wfir(ftype,forder,cfreq,wtype,fpar)

Parameters

• 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.

Author

C. Bunks