For over modulation, the value of modulation index m is

Q.  For over modulation, the value of modulation index m is
- Published on 13 Oct 15

a. m < 1
b. m = 1
c. m > 1
d. Not predetermined

ANSWER: m > 1
 
In AM, the modulation index m is defined as the ratio of the amplitude modulation signal to the amplitude of carrier signal. When m > 1, it is called over-modulation and it generates modulation with distortions in the envelope of the modulated signal, from which it is difficult to recover the information.

For Under modulation m < 1

For Critical modulation m = 1

For Over modulation m > 1

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