Appendix 4

Power amplifier terminology

Over 550 terms and abbreviations explained. Drawn from analogue power electronics, mechanical engineering; audio and electro-acoustics systems technology, music, the stage and recording production environments.

If the term or abbreviation sought is absent see the succeeding section, ‘electronic units’.

abscissa Horizontal or X axis of a graph.

absolute value When quantity alone is the issue, and polarity (+ or −) is of no consequence. This makes no sense with money, but it has meaning with waveforms, where ‘minus’ is just a name for ‘other side’, not a debt. A full wave rectifier has the property of making all output voltage values one way, either positive or negative. This is absolute value conversion. ...

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