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Analog Signal ○꠹｜Definition｜1st｜20251119205401-00-⌔
Analog signal
An analog signal (American English) or analogue signal (British and Commonwealth English) is any signal, typically a continuous-time signal, representing some other quantity, i.e., analogous to another quantity. For example, in an analog audio signal, the instantaneous signal voltage varies in a manner analogous to the pressure of the sound waves.1
In contrast, a digital signal represents the original time-varying quantity as a sampled sequence of quantized numeric values, typically but not necessarily in the form of a binary value. Digital sampling imposes some bandwidth and dynamic range constraints on the representation and adds quantization noise.
The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, and other systems may also convey or be considered analog signals.
Printed 2026-06-28.
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Link to original Footnotes
Ferguson, Stuart; Hebels, Rodney (2003). “Communications and networking”. Computers for Librarians. pp. 197–226. doi:10.1016/B978-1-876938-60-4.50013-6. ISBN 978-1-876938-60-4. ↩
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