A band-limited signal x(t) is to be transmitted using narrowband FM techniques. That is,...

A band-limited signal x(t) is to be transmitted using narrowband FM techniques. That is, the modulation index m, as defined in Section 8.7, is much less than π/2. Before x(t) is transmitted to the modulator, it is processed so that and . This normalized x(t) is now used to angle-modulate a carrier to fonn the FM signal