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A bandpass sampling extends from 4-6 kHz. What is the smallest sampling frequency required to retain all the information in the signal.

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A bandpass sampling extends from 4-6 kHz. What is the smallest sampling frequency required to retain all the information in the signal.

(a) 1 kHz

(b) 2 kHz

(c) 3 kHz

(d) 4 kHz

This question was addressed to me in final exam.

My question is taken from Spectrum Analysis of Sampling Process in portion Digital Control Systems of Control Systems

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Best answer
The correct answer is (d) 4 kHz

The best I can explain: fh =6 kHz

Bandwidth = 2 kHz

Fs =4 kHz.

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