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  4. An audio signal v m =20 sin 2 π(1500 t ) amplitude modulates a carrier vC=80 sin 2 π(100,000 t) The value of percent modulation is

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Q. An audio signal $v_{ m }=20 \sin 2 \pi(1500 t )$ amplitude modulates a carrier $v_{C}=80 \sin 2 \pi(100,000 t)$ The value of percent modulation is

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Solution:

$\%$ modulation $=\frac{ Am }{ Ac } \times 100$
$\%$ modulation $=\frac{20}{80} \times 100$
$\%$ modulation $=25 \%$