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An analog signal is any continuous signal representing some other quantity, i.e., "analogous" to another quantity. For example, in an analog audio signal, the instantaneous signal voltage 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.

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  • Analog signal (en)
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  • An analog signal is any continuous signal representing some other quantity, i.e., "analogous" to another quantity. For example, in an analog audio signal, the instantaneous signal voltage 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. (en)
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  • An analog signal is any continuous signal representing some other quantity, i.e., "analogous" to another quantity. For example, in an analog audio signal, the instantaneous signal voltage 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. (en)
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