For example, an FM signal with 5 kHz peak deviation, and a maximum audio frequency of 3 kHz, would require an approximate bandwidth 2(5+3) = 16 kHz. For example, standard broadcast FM has a peak deviation of 75 kHz above and below the carrier. With stereo FM, the highest modulating frequency (which combines L+R and L-R) is 53 kHz. So most of the e...