Exam-style question
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Which best describes the impact of quantisation in digital communication?.
- A.Quantisation introduces a fixed level of distortion not present in analogue signals
- B.Quantisation eliminates all distortion present in analogue signals
- C.Quantisation has no effect on signal quality
- D.Quantisation only affects the colour of the signal
Model answer
What a good answer should say
- Quantisation introduces a fixed level of distortion not present in analogue signals
Explanation
Why this works
Define both: Analogue signals can represent infinitely many values; digital signals are limited to discrete levels. The key difference is quantisation error, a fixed distortion inherent to digital representation.
This error is absent in perfectly analogue transmission. Thus the correct option identifies the qualitative effect of quantisation.
Common mistake
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