question_answer

An audio signal consists of two distinct sound: one a human speech signal in the frequency band of 200 Hz to 2700 Hz, while the other is a high frequency music signal in the frequency band of 10200 Hz to 15200 Hz. The ratio of the AM signal band width required to send both the signals together to the AM signal band width required to send just the human speech is: [JEE ONLINE 09-04-2016]

A) 6

B) 5

C) 3

D) 2

Correct Answer: A

Solution :

[a] Band width for both signals

15200 Hz - 200 Hz = 15000 Hz

Band width for human speech

2700 Hz - 200 Hz = 2500 Hz

The ratio