Audio Home Recording Act:

This 1992 legislation exempts consumers from lawsuits for copyright violations when they record music for private, noncommercial use and eases access to advanced digital audio recording technologies. The law also provides for the payment of modest royalties to music creators and copyright owners, and mandates the inclusion of the Serial Copying Management Systems in all consumer digital audio recorders to limit multi-generational audio copying (i.e., making copies of copies). This legislation will also apply to all future digital recording technologies, so Congress will not be forced to revisit the issue as each new product becomes available.

Audit

Conducted by an independent accounting firm, an audit verifies shipment and sales levels for each audio and music video format after returns. In addition, the audit calculates what product has been shipped for sale, net after returns, versus product used for promotional purposes. A formal certification report is issued and sent to the record company.

auditory filter

Term used to describe the concept of critical bands. Analogous to a bandpass filter with a rounded top ("rounded-exponential" after Patterson and Moore, 1986). The filter is slightly asymmetric, being wider on the low-frequency side.

Auto Correlation

A process that determines optimum start and ending loop points to produce minimum discontinuity.

Automatic Gain Control (Automatic Volume Control)

A compressor with a very long release time used to keep the volume of the audio very constant.

Automation

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.

Aux Send

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.

Auxilary Controllers

These are external controlling devices used in conjunction with a main instrument or controller. Some examples of such controllers are foot pedals, pitch bending and modulation wheels.

Auxiliary Equipment

Effects devices separate from but working with the recording console.

Axis

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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