Suppose sc(t) is a speech signal with the continuous-time Fourier transform Sc(jΩ) shown in Figure P4.65-1. We obtain a discrete-time sequence sr[n] from the system shown in Figure P4.65-2, where H(ejω) is an ideal discrete-time lowpass filter with cutoff frequency ωc and a gain of L throughout the passband, as shown in Figure 4.29(b). The signal sr[n] will be used as an input to a speech coder, which operates correctly only on discrete-time samples representing speech sampled at an 8-kHz rate. Choose values of L,M, and ωc that produce the correct input signal sr[n] for the speech coder.
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