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The carrier w...

Question

The carrier wave is represented by $C (t) = 5 s i n (10 π t) v o l t$ . A modulating signal is asquare wave as shown. Determine modulation index.

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Solution

$M o d u l a t i o n i n d e x = \frac{A m p l i t u d e o f M o d u l a t i n g S i g n a l}{A m p l i t u d e o f C a r r i e r W a v e}$

Here, amplitude of modulating signal, $A_{m} = 2 V$
Amplitude of carrier wave, $A_{c} = 5 V$
$∴ μ = \frac{A_{m}}{A_{c}} = \frac{2}{5} = 0.4$

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