Practice question · Fill in the blanks
Complete the reason digital systems are so reliable.
Digital systems tolerate noise because ______.
Word bank: their wires carry no analog voltage at all · a small analog disturbance does not push the signal across the threshold · they operate at a lower temperature · errors are always corrected by software
Hints
- The bit is recovered by comparing against a threshold, not by measuring precisely.
- A disturbance only matters if it changes which side of the line the signal sits on.
Show the answer
Digital systems tolerate noise because a small analog disturbance does not push the signal across the threshold.
Why
Because the receiver only asks which side of the threshold the voltage is on, small wobbles are discarded entirely. The wires do carry genuine analog voltages, and this thresholding is what turns them into clean, restorable bits.
Practise Information, Signals, and the Physics of Computing
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