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A male voice after modulation-transmission sounds

Question:

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 < 1)

(b) poor bandwidth selection of amplifiers

(c) poor selection of carrier frequency

(d) loss of energy in transmission

Solution:

(b) poor bandwidth selection of amplifiers

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