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- Transition width TW (
main lobe width) determined by
window length
and window type:
- As window gets longer, its main lobe narrows
- Narrower main lobe
narrower transition band
- Tighter specs demand longer filters
- Length
in general, where
for rectangular, 2 for generalized Hamming, 3 for Blackman,
etc.
- Pass-band and stop-band ripple are determined by window side lobes
- We do not have individual control over passband and stopband
ripple (limitation of window method)
- Ripple determined by window used
- Ripple normally largest around transition band
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