Question
Question: A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude mo...
A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation. The frequencies of the side bands will be
A
1.003 MHz and 0.997 MHz
B
3001 kHz and 2997 kHz
C
1003 kHz and 1000 kHz
D
1 MHz and 0.997 MHz
Answer
1.003 MHz and 0.997 MHz
Explanation
Solution
: Here , υc=1MHz,υm=3kHz=0.003MHz
The frequencies of the side bands
=(υc+υm)and(υc−υm)
=(1+0.003)and(1−0.003)
=1.003MHzand0.997MHz