Question

In the case of amplitude modulation to avoid distortion the modulation index $(\mu )$ should be:

• A. $\mu \le 1$
• B. $\mu \ge 1$
• C. $\mu =2$
• D. $\mu =0$

Answer 1

Answer: (A)

$\mu =\frac{A_m}{A_c}$
$\mu \le 1$ to avoid distortion
because $\mu >1$ will result in interference between career frequency & message frequency.