WBoucherot cell
WCausal filter
WCommensurate line circuit
WCutoff frequency
WElectrical resonance
WImpedance matching
WKolmogorov–Zurbenko filter
WLinkwitz–Riley filter
WMatched Z-transform method
WParks–McClellan filter design algorithm
WPrototype filter
WRinging (signal)
WSavitzky–Golay filter
WSinc filter
WStopband
WYIG sphere