NIELIT 2016 DEC Scientist B (CS) - Section B: 25

Question

A low pass filter is

• A. Passes the frequencies lower than the specified cut off frequency
• B. Used to recover signal from sampled signal
• C. Rejects higher frequencies
• D. All of the above

Answer 1

Option D

The low pass filter should have the cut off frequency equal to wm so that it allows only lower frequencies up to the cut off frequency to pass through. The other higher frequencies in the sampled signal are rejected by the low pass filter. The original or desired signal may be recovered from the sampled signal by passing the signal through a low pass filter.