. . . "In the figure, fS designates a sampling frequency of polyphase filters 43 0 to 43 M???1, fk designates a shift frequency, fB designates a pass-bandwidth, k???1 designates a spectrumof (k???1)-th filter, k designates a spectrum of k-th filter and k+1 designates a spectrum of (k+1)-th filter where k is an integer as defined by M???k???1." .