From Absorption to Axis
Short for the term Acoustical Absorption (quality of a surface or substance to take in, not reflect, a sound wave).
1) Abbreviation for alternating current.
2) An abbreviation of the term Alternating Current (electric current which flows back and forth in a circuit; all studio signals running through audio lines are AC).
Having to do with sound that can be heard by the ears.
AcousticsThe behaviour of sound and its study. The acoustics of a room depend on its size and shape and the amount and position of sound-absorbing and reflecting material.
The portion of the instrument which makes the vibrating source move more air or move air more efficiently; this makes the sound of the instrument louder. Examples of acoustic amplifiers include:
1) The body of an acoustic guitar,
2) The sounding board of a piano,
3) The bell of a horn and
4) The shell of a drum.
Acoustic Echo Chamber
A room designed with very hard, non-parallel surfaces and equipped with a speaker and microphone; dry signals from the console are fed to the speaker and the microphone will have a reverberation of these signals that can be mixed in with the dry signals at the console.
In guitar playing, action refers to how far the strings sit off of the guitar neck. When strings are close to the neck, it is referred to as “Low Action”. When the string sit far above the neck, it is called “High Action”. Guitars with low action are easier to play, but make sure they are not too close, or it could causing buzzing.
Uses active devices (transistors, IC’s, tubes) and some form of power supply to operate.
Scientific definitions aside, active microphones generally sound better than inactive ones, but they generally cost more. They also require the use of either a battery or phantom power while inactive mics need only be plugged into the mic cord in order to work. In most playing situations, the subtle improvement in sound quality from an active mic isn’t worth the extra cost and hassle. One possible exception it the headset mic. Put simply, inactive headset mics just plain suck. Active headset mics put out a much stronger signal and feed back much less.
An abbreviation of Analog to Digital Conversion (the conversion of a quantity that has continuous changes into numbers that approximate those changes), or Analog to Digital Converter.
A trademark of Alesis Corporation designating its modular digital multitrack recording system released in early 1993.
The letters A, D, S &R are the first letters of: Attack, Decay, Sustain and Release. These are the various elements of volume changes in the sounding of a keyboard instrument.
An abbreviation of Audio Engineering Society.
Professional Interface A standard for sending and receiving digital audio adopted by the Audio Engineering Society and the European Broadcast Union.
A sampler mis-recognizing a signal sent to it that is at a frequency higher than the Nyquist Frequency. Upon playback, the system will provide a signal at an incorrect frequency (called an alias frequency). Aliasing is a kind of distortion.
Electric current which flows back and forth in a circuit.
The portion of the sound that comes from the surrounding environment rather than directly from the sound source.
A term with the same meaning as the term Reverberant Field (the area away from the sound source where the reverberation is louder than the direct sound).
Placing a microphone in the reverberant field (where the reverberation is louder than the direct sound) so as to do a separate recording of the ambience or to allow the recording engineer to change the mix of direct to reverberant sound in recording.
1) An abbreviation of the term Amplifier (A device which increases the level of an electrical signal.
2) An abbreviation of Ampere (the unit of current).
3) An abbreviation of amplitude (the height of a waveform above or below the zero line).
Amplifier (Power amp, Head)
It’s the part of the sound system that actually magnifies or “amplifies” the sound. In other words, it makes stuff louder.
The unit of current, abbreviated Amp.
An increasing of signal strength.
A device which increases the amplitude (level) of an electrical signal (making it louder).
Sound equipment that converts the low voltage, low current signal from a tape deck, mixer etc. into a higher current signal suitable for driving speakers. See Power Amplifier, Crossover.
The height of a waveform above or below the zero line.
The strength of a vibrating wave; in sound, the loudness of the sound.
The extreme range of a signal. Usually measured from the average to the extreme.
Representative, continuous changes that relate to another quantity that has a continuous change.
A recording of the continuous changes of an audio waveform.
Analog To Digital Converter
The device which does the conversion of a quantity that has continuous changes (usually of voltage) into numbers that approximate those changes.
The visible sparks generated by an electrical discharge.
The electronic dohickey under the knobs that increases or reduces the strength of the signal running through it. When these get old and dirty, they can make popping noises or rumbles in your PA (As in “my pots are dirty”).
Assign Tochoose to which place an output is going to be sent.
A less elevated version of the term Second Engineer. Experienced seconds often place microphones, operate tape machines, break down equipment at the session end and keep the paperwork for the session.
The smallest particle which makes up a specific substance. It’s composed of a center around which electrons revolve.
The rate the sound begins and increases in volume.
A making smaller: reduction of electrical or acoustic signal strength.
Most often referring to electrical signals resulting from the sound pressure wave being converted into electrical energy.
Automatic Gain Control (Automatic Volume Control)
A compressor with a very long release time used to keep the volume of the audio very constant.
In consoles, a feature that lets the engineer program control changes (such as fader level) so that upon playback of the multitrack recording these changes happen automatically.
Short for the term Auxiliary Send (a control to adjust the level of the signal sent from the console input channel to the auxiliary equipment through the aux buss.
Effects devices separate from but working with the recording console.
Auxiliary Input or Return
A route back into the sound desk for a signal sent to a piece of outboard equipment via an auxiliary send.
Auxiliary Output or Send
An additional output from a sound desk that can be used for foldback or monitoring without tying up the main outputs. Each input channel will have a path to the Aux buss. Also used for feeding a signal to an effects processor. See Auxiliary Return.
A line around which a device operates. Example: In a microphone, this would be an imaginary line coming out from the front of the microphone in the direction of motion of the diaphragm.
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