In amplitude modulation, the modulation index m, is kept less than or

In amplitude modulation, the modulation index m, is kept less than or equal to 1 because (a) m > 1, will result in interference between carrier frequency and message frequency, resulting into distortion. (b) m > 1 will result in overlapping of both side bands resulting into loss of information. (c) m > 1 will result in change in phase between carrier signal and message signal. (d) m > 1 indicates amplitude of message signal greater than amplitude of carrier signal resulting into distortion.

Answer»

(b), (d)

(b) m > 1 will result in overlapping of both side bands resulting into loss of information.

(d) m > 1 indicates amplitude of message signal greater than amplitude of carrier signal resulting into distortion.