Designing FIR digital transport processors using simple spectral transformations

Filters synthesized with only delays, adders, and subtracters, called transport processors, are discussed. Typically, transport processor design techniques utilize parallel and cascaded subfilters in order to meet required frequency specifications. A standard procedure for designing linear-phase FIR filters is to design a lowpass linear phase filter with a desirable frequency response characteristic and then transform that filter into a highpass, bandpass, or band reject filter by using simple spectral transformations.<>