In the case of a signal with period T along the time axis, Joseph Fourier, as early as 1822, showed that an infinite set of sinusoidal signals with periods T/n (with n = 1, 2, 3, . . ., and an additional fixed term) can be used to mathematically describe the signal. These ...
(sma4iraefendhdrmgtackeen;bdtbc0rgtee;kdetrcreacthe0ctyeertaictshhllte4rwehpeotaiiafistdhclmsthpeeo0n,noanatdtsohtseiano0hnattestncted.snisehthfii0tncteeadn.secuetAeostie–i,sn.htercC,teperosfrers,4hto.tC,itwpreftoodrhsu3f4atleitwrhFtooalchsn3h0he0wrderaehbkucan0e0rthoeeeiddarurkcyeu...