Analog signal

An analog signal is any continuous signal for which the time-varying feature of the signal represents some other time-varying quantity, i.e. analogous to another time-varying signal. For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves.

In contrast, a digital signal represents the original time-varying quantity as a sampled sequence of quantized values. This imposes some bandwidth and dynamic range constraints on the representation but, unlike the analog signal, can avoid further electronic noise and distortion.

The term analog signal usually refers to electrical signals; however, mechanical, pneumatic, hydraulic, and other systems may also convey or be considered analog signals.

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