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Definition: Based on continuously varying values or voltages. For example, a speedometer is an analog device that shows changes in speed using a needle indicator that can move over an infinite range of speeds up to the maximum limit of the vehicle.Analog techniques also are used for the reproduction of music in standard LP records and audio cassettes.
Source: Pfaffenberger, Bryan. Webster's new world computer dicdtionary. London: Wiley, 2003. Print.