# An audio signal consists of two distinct sounds : 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 bandwidth required to send both the signals together to the AM signal bandwidth required to send just the human speech is : Option 1) 3 Option 2) 5 Option 3) 6 Option 4) 2

Aw we learnt in

Doppler Effect -

When a source of sound and a listener are in motion relative to each other, the frequency of the sound heard by the listener is not the same as the source frequency.

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Band width for both signals 15200 Hz - 200 Hz = 15000 Hz

Band width for human speed 2700 Hz - 200 Hz = 2500 Hz

The ratio $=\frac{15000}{2500}=6$

Correct option is 3.

Option 1)

3

This is an incorrect option.

Option 2)

5

This is an incorrect option.

Option 3)

6

This is the correct option.

Option 4)

2

This is an incorrect option.

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