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A speech signal of 3 kHz is used to modu...

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 2. 997 MHz

B

3001 kHz and 2997 kHz

C

1003 kHz and 1000 kHz

D

1 MHz and 0.997 MHz

Text Solution

Verified by Experts

The correct Answer is:
A
Sideband frequencies are :
Lower sideband
`(LSB) = omega_c - omega_m`
`= 1xx10^6 Hz - 3xx10^3 Hz`
`(1000- 3)xx 10^3 Hz`
`2997 kHz`
`and = 2.997 MHz`
Upper sideband
`(USB) = omega _c + omega_m`
`1xx 10^6 Hz + 3xx 10^3 Hz`
`1003 kHz`
`= 1.003 MHz`.
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