AB stereo Often used to distinguish MS stereo from the convention signal using left and right signals. In the context of microphones it often implies the use of spaced omnidirectional mics rather than a coincident pair.

ADAT A digital multitrack recording system that gives eight tracks on an S-VHS videocassette.

ADPCM (Adaptive Differential Pulse Code Modulation) Conventional Pulse Code Modulation stores the values of a waveform as a series of absolute values. Differential PCM does not do this but instead sends the data as a series of numbers indicating the difference between successive samples.

ADSL (Asymmetric Digital Subscriber Line) Sometimes known as a ‘cable modem’, this is telephone data service where higher data speeds are ...

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