4.5-1 A vestigial filter H;(f) shown in the transmitter of Fig. 4.21 has a transfer function as shown in Fig. P4.5-1. The carrier frequency is fe = 10 kHz and the baseband signal bandwidth is 4 kHz. Find the corresponding transfer function of the equalizer filter H,(f) shown in the receiver of Fig. 4.21. Hnt: Use Eq. (4.25). Figure P.A.5-1 2 9. 10 11 12 14 f kHz Hence H,f) = (4.25) H;f +f) + H;(f - fo) Note that because H;(f) is a bandpass filter, the terms H;(f f) contain low-pass components.