Which of the following is true with respect to undersampling?(a) High power(b) Greater than Nyquist frequency(c) Use low pass filters(d) Less memory sizeThis question was addressed to me during an online interview.Asked question is from Data Conversion topic in section Digital Communication Techniques of Avionics

Which of the following is true with respect to undersampling?(a) High

1.	Which of the following is true with respect to undersampling?(a) High power(b) Greater than Nyquist frequency(c) Use low pass filters(d) Less memory sizeThis question was addressed to me during an online interview.Asked question is from Data Conversion topic in section Digital Communication Techniques of Avionics
Answer» RIGHT answer is (c) Use low pass filters The best explanation: Undersampling causes aliasing which at the output of the ADC results in a wave with much LOWER FREQUENCY than the original signal. To reduce aliasing EFFECTS, antialiasing filters are used which acts as a low pass FILTER.

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