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[r]epresenting data by measuring a continuous physical variable, such as the rotation of hands on a clock, in contrast to a digital clock.[1]


Analog is "a device or system that represents sound as continuously variable physical quantities."[2]


In an analog (also spelled analogue) signal analogy tv VCR turning signal ATSC

information (sound, video, or data) travels in a continuous wave whose strength and frequency vary directly with a changing physical quantity at the source.[3]


A typical analog device is a clock on which the hands move continuously around the face. Such a clock is capable of indicating every possible time of day. In contrast, a digital clock is capable of representing only a finite number of times (every 10th of a second, for example).

Analog signals are used in telecommunications.

Analog is the opposite of digital.


In the context of music, "analog" technologies refer to traditional radio, cassettes, and vinyl, among others. These technologies may deliver imprecise signals and background noise. Thus, when analog music is replicated there is a reduction in the quality of the sound.


"Analog systems can represent cybersecurity vulnerabilities, especially if these are modem-connected and the modem is unsecured."[4]


  1. EPA, Vocabulary Catalog List Detail - Records Glossary (full-text).
  2. ARSC Guide to Audio Preservation, Glossary, App. B, at 223.
  3. Radiofrequency Spectrum Management, at 2.
  4. Cybersecurity Issues for the Bulk Power System, at 1 n.3; U.S. Department of Homeland Security, National Cyber Security Division, Recommended Practice for Securing Control System Modems (Jan. 2008} (SecuringModems.pdf full-text).

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