High Definition Audio for the Digital Home: Proven Techniques for Getting It Right the First Time

By Wayne Jones

Glossary

5.1: A surround sound format with five full range channels (front left, front center, front right, rear left, rear right) and one low frequency effects channel.
7.1: A surround sound format with seven full range channels (front left, front center, front right, rear left, rear right, side or surround left, side or surround right) and one low frequency effects channel

AAC: Advanced Audio Coding is an audio coding algorithm used for compressed audio in both MPEG-2 and MPEG-4 standards.
A-weighting filter: A specific noise-weighting filter (ANSI S1.4, IEC Recommendation 179) used to produce noise measurements which correlate well with human observations.

See also weighting filter.
absolute noise level: The noise level at the output of the converter. For DACs, this is specified in dBV, while for ADCs it is specified in dBFS.
AC-3: A multi-channel audio compression algorithm used in DTV and DVD. This term is no longer used, having been replaced by "Dolby Digital."
AC97: An audio bus and controller infrastructure developed by Intel Corporation in 1997. This term has been superseded by the Intel High Definition Audio Specification.
acoustic echo cancellation (AEC): A technique used to remove room echoes of incoming speech during a VoIP call or other types of realtime communications.
acoustic energy: The amount of energy that an object emits in the form of sound.
ADAT: Alesis Digital Audio Tape is commonly used to refer to a digital optical interface capable of transporting eight channels of 24-bit audio over a standard TOSLINK

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High Definition Audio for the Digital Home: Proven Techniques for Getting It Right the First Time