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AOTD: 2/21/09 February 21, 2009

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(not a true acronym, but)

Hi-Z – The “Z” is a symbol for impedance, meaning this stands for high impedance (measured in Ohms).  Typically something designated as having high impedance means more than a few thousand ohms.

AOTD: 2/9/09 February 9, 2009

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STC – Sound Transmission Coefficient

This is a number assigned to building materials to provide a means of comparing acoustical isolation properties.  The higher the number, the more isolation.  (For example, a CMU wall filled with sand would have a higher rating than a piece of drywall).  These numbers are important to acousticians when doing things like figuring out theoretical reverb time (RT60) calculations, among numerous other applications.

AOTD: 1/30/09 January 30, 2009

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FET – Field Effect Transistor

This is an electronic component which relies on an electric field to control the (shape, and therefore) flow of a channel.  Essentially, the FET is the solid-state equivalent of a tube.  the JFET (Junction Field-Effect Transistor) and MOSFET (Metal–Oxide–Semiconductor Field-Effect Transistor) are commonly used in audio circuits.

AOTD: 11/26/08 November 26, 2008

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DAC – a digital to analog converter

AOTD: 11/25/08 November 25, 2008

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MIDI – Musical Instrument Digital Interface

AOTD: 11/24/08 November 24, 2008

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MS – Mid-Side stereo recording.  This method uses two mics: (typically) one in bipolar and one in cardiod.  The bipolar track is duplicated, one side flipped in polarity, and panned oppositely (the “side”).  The cardiod track remains in the center (the “mid”).  (There will likely be a more in-depth post on MS recording in the future)

AOTD: 11/23/08 November 23, 2008

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CPU – central processing unit… obviously a fairly essential part of your computer :O  The higher the speed, the better!

AOTD: 11/22/08 November 22, 2008

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PCM – pulse code modulation (a method of encoding and decoding digital audio using a series of points taken from the original signal at an interval determined by the encoder) WAV and AIFF files are PCM files

AOTD: 11/21/08 November 21, 2008

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AVI – (pronounced like the three letters, A. V. I.) Audio Video Interleaved.  This is a Microsoft-based media format.  (Its very similar to other audio/video formats out there, such as Apple’s .MOV)

AOTD: 11/20/08 November 20, 2008

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LFO – Low Frequency Oscillator (usually used as some sort of modulator in a synthesizer)

AOTD: 11/19/08 November 19, 2008

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ADAT – Alesis Digital Audio Tape (ADAT is a very popular 8-channel digital connection, also called “light pipe”)

AOTD: 11/18/08 November 18, 2008

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AES – Audio Engineer’s Society

BNC – Bayonet Neill-Conselman connector (note: its not “British Naval Connector”)

AOTD (Acronyms of the Day) 11/17/08 November 17, 2008

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Thought I’d start doing this, both to get me posting daily and to develop a small glossary of audio-related acronyms. My goal is to get at least one AOTD everyday.

AAC – Advanced Audio Coding (Codec)

MP3 – (MPEG-1 Audio Layer 3) Motion Picture Experts Group -1 Audio Layer 3

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