In amplitude modulation, the modulation index mu, is kept less than or equal to 1 because.

Options

A. `mu gt 1` will result in interference between carrier frequency and message frequency, resulting into distortion.
B. `mu gt 1` will result in overlapping of both sidebands resulting into loss of information.
C. `mu gt 1` will result in change in phase between carrier signal and message signal.
D. `mu gt 1` indicates amplitude of message signal greater than amplitude of carrier signal resulting into distortion.

Answer

B, D

Explanation

Due to over modulation `mu gt 1` , sidebands overlaps and fanding( loss of information) may occur. Also when `mu ~~ 1`, distortion in carrier waveform occurs.