Page 183 - DSP Integrated Circuits

168 Chapter 4 Digital Filters

Figure 4.58 Spectrum of the original sequence and the intermediate sequence with L = 3

Figure 4.59 Spectrum of the sequences x(n) andy(m)

Obviously, it is not necessary to perform
arithmetic operations involving the zeros in the
input sequence x\(m). Various schemes have
been proposed to exploit this fact in order to
reduce the computational work load. The inter-
polator is described by the pseudo-code shown in
Box. 4.1. Figure 4.60 Interpolator