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Aliasing refers to ________

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Aliasing refers to ________

(a) Sampling of signals less than at Nyquist rate

(b) Sampling of signals at Nyquist rate

(c) Sampling of signals greater than at Nyquist rate

(d) Unsampled the original signal

I got this question in class test.

I'd like to ask this question from Heterodyne Receiver in section Receivers & Transducers of Analog Communications

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Right option is (a) Sampling of signals less than at Nyquist rate

The explanation is: Aliasing refers to the sampling of signals less than at Nyquist rate. Nyquist rate states that the rate of sampling of signals should be greater than or equal to twice the bandwidth of modulating signal. It gets reduced if sampling is done at a higher rate than nyquist rate of sampling. Aliasing can be avoided by using anti-aliasing filters.

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