Italics refer to index or other glossary entries.

AC Alternating current. Electric current that changes direction of flow. See sine wave and DC.
Aliasing Interference effects between parts of the signal with common features.
Amp The standard unit of electric current. See voltage.
Amplifier A device to increase signal level. To do so requires the supply of power. See Proc Amp.
Amplitude Amount of signal. See level and Index.
Aspect ratio The ratio of picture width to height. See Index.
B & B Black and burst (sync and colour burst).
Bandwidth See Index.
Bar graph A linear thermometer-like electronic display of audio signal level.
Battery A source of electrical energy held in chemical form. Also used to denote ...

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