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by GANESH KR on December 11th, 2003

GANESH KR

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What is the difference between analog and digital signals?

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  • by Karl Plesz on August 26th, 2005

    Karl Plesz

    Another way to describe it:

    An analog signal is continuously variable. It differs from a digital signal in that <b><i>small fluctuations in the signal are meaningful</i></b>. That is the key. Whereas a digital signal only represents 2 values (0 and 1 - or off and on).

    The primary disadvantage of an analog signal is noise. As an analog signal is processed (copied, sampled, amplified, etc) the noise is hard to discriminate from the actual signal. Noise is much easier to filter out of a digital signal, because anything other than the pure 'high' or 'low' signal is considered noise.

    Hopefully that was easy to understand....

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