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What is it called when the sampled signal is of lower frequency than the original signal?

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What is it called when the sampled signal is of lower frequency than the original signal?

(a) Aliasing

(b) Overshoot

(c) Steady state error

(d) Damping

This question was posed to me during an online exam.

My question is taken from Digital Implementation in chapter Fly by Wire Flight Control of Avionics

1 Answer

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The correct choice is (a) Aliasing

To explain: When the sampled signal is of lower frequency than the original signal it is known as aliasing. Aliasing induces data loss and errors. It can be reduced by a process called anti-aliasing.

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