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A digital signal is sampled incorrectly causing aliasing. What is the main cause of this problem?

medium📝 Analysis Q7 of 15
Computer Networks - Physical and Data Link Layer
A digital signal is sampled incorrectly causing aliasing. What is the main cause of this problem?
ASampling frequency is too low
BSignal amplitude is too high
CSignal is too short
DUsing an analog signal
Step-by-Step Solution
Solution:

  1. Step 1: Understand aliasing

    Aliasing happens when sampling frequency is less than twice the highest signal frequency.

  2. Step 2: Identify cause

    Sampling too slowly causes different signals to appear the same, causing errors.

  3. Final Answer:

    Sampling frequency is too low -> Option A

  4. Quick Check:

    Aliasing cause = low sampling rate [OK]
Quick Trick: Sample at least twice the highest frequency [OK]
Common Mistakes:
MISTAKES
  • Blaming amplitude
  • Thinking signal length causes aliasing
  • Confusing analog signal use

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