Definitions[edit | edit source]
General[edit | edit source]
Analog (also spelled analogue) is
|“||[r]epresenting data by measuring a continuous physical variable, such as the rotation of hands on a clock, in contrast to a digital clock.||”|
Sound[edit | edit source]
Telecommunications[edit | edit source]
In an analog (also spelled analogue) signal
|“||information (sound, video, or data) travels in a continuous wave whose strength and frequency vary directly with a changing physical quantity at the source.||”|
Overview[edit | edit source]
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 is the opposite of digital.
Music[edit | edit source]
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.
Cybersecurity[edit | edit source]
References[edit | edit source]
- EPA, Vocabulary Catalog List Detail - Records Glossary (full-text).
- ARSC Guide to Audio Preservation, Glossary, App. B, at 223.
- Radiofrequency Spectrum Management, at 2.
- 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).