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A signal represented by x(t) =5cos 400πt is sampled at a rate 300 samples/sec. The resulting samples are passed through an ideal low pass filter of cut-off frequency 150 Hz. Which of the following will be contained in the output of the LPF?

A signal represented by x(t) =5cos 400πt is sampled at a rate 300 samples/sec. The resulting samples are passed through an ideal low pass filter of cut-off frequency 150 Hz. Which of the following will be contained in the output of the LPF? Correct Answer 100 Hz

x (t) =5cos400πt fm =200 Hz The output of the LPF will contain frequencies which are less than fc =150 Hz. So, fs-fm =300-200 =100 Hz is the only component present in the output of LPF.

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