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Logic Pro 9 User Manual - Help Library - Apple

Logic Pro 9 User Manual - Help Library - Apple

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Glossary<br />

AAC Abbreviation for Advanced Audio Codec. A compression and decompression algorithm<br />

and file format for audio data.<br />

AAF Abbreviation for Advanced Authoring Format. A cross-platform project exchange file<br />

format that you can use to import multiple audio tracks, inclusive of references to tracks,<br />

time positions, and volume automation.<br />

accelerando A gradual increase in tempo (see tempo).<br />

AD converter or ADC Short for analog-to-digital converter; a device that converts an<br />

analog signal to a digital signal.<br />

ADAT Abbreviation for Alesis Digital Audio Tape. The ADAT is an eight track digital<br />

multitrack cassette recorder that uses an S-VHS video tape to record audio at 16 or 20 bit<br />

depth.<br />

ADAT optical Optical interface for parallel transmission of eight audio channels via<br />

fiber-optic cable. It is a well-established standard for digital multi-channel interfaces.<br />

AES/EBU Short for Audio Engineering Society/European Broadcasting Union. This association<br />

has a standard transmission format for professional stereo digital audio signals called<br />

AES/EBU. The format is similar to S/P-DIF, but uses balanced line drivers at a higher voltage.<br />

Depending on the type of devices involved, AES/EBU and S/P-DIF coaxial interfaces can<br />

communicate directly.<br />

aftertouch MIDI data-type generated by pressure on keys after they have been struck.<br />

There are two types: Channel aftertouch, the value of which is measured by a full length<br />

keyboard sensor. It affects all played notes. Polyphonic aftertouch (rare) is individually<br />

measured and transmitted for each key. Aftertouch is also known as key pressure or<br />

pressure sensitivity.<br />

AIFF Abbreviation for Audio Interchange File Format. A cross-platform file format supported<br />

by a large number of digital audio and video editing applications. AIFF audio can use a<br />

variety of bit depths, most commonly 16 and 24 bit.<br />

AKAI Common sample data format that the EXS24 mkII is compatible with.<br />

Glossary<br />

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