A baseband bandwidth is equal to the highest frequency of a signal or system, or an upper bound on such frequencies, for example the upper cut-off frequency of a low-pass filter. By contrast, passband bandwidth is the difference between a highest frequency and a nonzero lowest frequency.
a bAsebAnd bandwIdth is EQUAL tO the highEst FrequeNCy oF A signaL or SyStEm, oR an upPEr bounD oN suCh frEqUEnCIEs, For exaMpLE the upper cut-oFf freQueNcy of A lOw-PAss filter. by cONtRAsT, pASSBAnd BAndWidth is The difFeREnCe BeTwEen A HIghest fREquency anD a NoNZerO Lowest frequency.