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Systems and Signal Processing
Quick questions on Analogue versus digital signals explained: O-Level Electronics Systems and Signal Processing
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are analogue signals?Show answer
An analogue signal varies continuously and can take any value within its range. The voltage from a microphone, a temperature sensor, or the mains supply are analogue: they change smoothly over time and carry their information in the exact size of the voltage at each instant. This makes them a natural match for real-world quantities, which also vary smoothly.
What are digital signals?Show answer
A digital signal is allowed only two levels: logic 0 (low) and logic 1 (high). It changes in steps, not smoothly, and carries information as patterns of these two states (binary). Computers, logic circuits and memory all work with digital signals.
What is advantages of digital?Show answer
Digital signals are widely preferred for processing and storing information because:
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