Glossary: AAC - Advanced Audio Coding (also MPEG-2 AAC)

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AAC - Advanced Audio Coding (also MPEG-2 AAC): An audio compression scheme that is a continuation of the MP3 CODEC, but uses better filtering methods, noise shaping and quantization resolution to produce higher-quality audio files at smaller bit rates. AAC is designed for use in digital broadcasting systems as well as for multi-channel and surround audio (such as 5.1), and based on its capability to support up to 96kHz sampling rates and 48 channels [including LFE], AAC could be the basis for audio in multimedia for the foreseeable future. Some streaming audio formats that have adopted the AAC scheme already are Liquid Audio (.lqt), AT&T's already fading .a2b format, and the soon-to-be-realized MP4 format.

A & R	A-B Stereo	A-Time
A-weighted	A440	AAC - Advanced Audio Coding (also MPEG-2 AAC)
AAF	Abalam	Abalone
ABS	Absolute Phase	Absorption
Absorption Coefficient	Alternating Current (AC)	AC-1
AC-2	AC-3	Academy Curve
A cappella	Accent	Access Time
Accidental	Accompaniment	Accumulator
Acetate	Acoustic Lens	Acoustic Suspension
Acoustic Treatment	ACPI	Action
Actionflo	Active	Active Sensing
Actuator	Adagio	ADAT
ADAT/FST	ADAT Optical	ADB
A/D Converter (ADC)	Additive Synthesis	Adjusto-Matic
ADPCM	ADR	ADSR
Aeolian Harp	Aerophone	AES
AES/EBU	AES3	AES3id
AES42-2001	AFL	AFM
Aftertouch	AFTRA	AGC
Aggregate Device	Aging Toner	Agitato
Agoya	AGP	AHDSFR
AIFF (Audio Interchange File Format)	AIR	AIT
Alder	Alder	Aleatoric Music (Composition)
Algorithm	Alias	Aliasing
Alkaline Battery	All-Button Mode	All-Notes-Off
Allegro	Alnico	Alteration
Altered Chord	Alternate Tuning	Alto
AM	Ambience	Ambisonics
Amen Break	Amperage	Ampere
Amp Head	Amplifier	Amplifier, Instrument
Amplitude	Amplitude Modulation	AMS
Analog	Analog Sequencer	Analog Synthesizer
Anamorphic	Andante	Anechoic
Anode	Anodize	Anodized
ANSI	ANSI A-Weighting	Antecedent and Consequence
Antenna	Antenna gain	Anti-Imaging Filter
Anti-Aliasing Filter	Anti-node	Aperiodic
API	Apoyando	Apple Talk
Application (Program)	Architecture	Archival Stability
Archtop Guitar	Arco	ARP Avatar
Arpeggiator	Arpeggio	Arrangement
Articulation	Artificial (or Automated) Double Tracking or ADT)	ASCAP
ASCII	Ash	Ashtray Bridge Cover
ASIC (Application Specific Integrated Circuit)	ASIO	Aspect Ratio
Asperity	ASPI	Asynchronous
ATA	ATA-2	ATA 66/100/120
ATAPI	Absolute Time Code	Atonal Music
ATRAC	ATRAC	Attack
Attenuation	Audio	Audiobook
Audiology	Audio RIP	Audio Suite
AudioUnits	Audiowire	Auditory Cortex
Augmented Interval	Auranomic	Author
Authorize	Auto Accompaniment	Autolocate/Autolocator
Automata	Automatic Mixer	Automation
Auto Punch	Aux Send	AVI
AWG (American Wire Gauge)	AWM	Axe