question_answer 15)

  A male voice after modulation transmission sounds like that of a female to the receiver. The problem is due to (a) poor selection of modulation index (selected 0<m<l) (b) poor bandwidth selection of amplifiess (c) poor selection of carrier frequency (d) loss of energy in transmission

Answer:

  (b) The frequency of male voice is less than that of a female voice. In the given problem, the frequency of modulated signal received becomes more, which is possible with the poor band width selection of amplifiers. It is so because band width in amplitude modulation = twice the frequency of modulating signal.