Spectrum Bandwidth Spectrum of a signal the range of frequencies contained in the signal Absolute bandwidth of a signal the width of the signal spectrum Many signals have an infinite bandwidth! Effective bandwidth of a signal often just referred to as bandwidth the narrow band of frequencies containing most of the signal energy DC Component (dc: direct currer -the component of zero frequency (i.e, f=0) - With no dc component, a signal has an average amplitude of zero -With a dc component, a signal has a frequency term at f=0 and a nonzero average amplitude 16
16 Spectrum & Bandwidth • Spectrum of a signal —the range of frequencies contained in the signal • Absolute bandwidth of a signal —the width of the signal spectrum —Many signals have an infinite bandwidth! • Effective bandwidth of a signal —often just referred to as bandwidth —the narrow band of frequencies containing “most” of the signal energy • DC Component (dc: direct current) —the component of zero frequency (i.e., f = 0) —With no dc component, a signal has an average amplitude of zero. —With a dc component, a signal has a frequency term at f = 0 and a nonzero average amplitude
Signal with DC Component average amplitude 0.0T 2.07 (a)s(O= 1+(4//)Isin (2m)+(1/3)sin (2r(3/ol So) 08 0.6 0.0 17
17 Signal with DC Component average amplitude