Apple Logic Pro 8 - Manual (Page 979)

Glossary 979
dB Abbreviation for decibels, a unit of measurement that describes the relationships of
voltage levels, intensity, or power, particularly in audio systems.
DC offset An error that can result in direct current (DC) being layered over the audio
signal, resulting in a vertical shift in the waveform position shown in the Sample Editor.
decay An envelope parameter that determines the time it takes for a signal to fall from
the maximum attack level to the sustain level. See envelope.
deesser A signal processor that removes hissing or sibilance in audio signals.
default The preset parameter value.
delay In the Environment, an object that can create a series of repeats. In the Arrange,
a region parameter which can delay or advance a selected region by a given number of
milliseconds. Delay is also an effect process that delays the incoming audio signal,
resulting in subtle chorusing effects through to endless repeats of the signal.
destructive Destructive audio processing means that the actual data of an audio file is
changed, as opposed to just editing peripheral or playback parameters.
Devices tab In Logic Pro, the Logic Pro > Preferences > Audio > Devices tab is used to
select and configure your audio hardware devices. In essence, you are altering the
driver configuration of your devices when using the Devices tab parameters. Also see
driver.
DFS An abbreviation for Digital Full Scale. Sometimes expressed as 0 dB DFS. This
(zero dB—as shown on the Logic Pro channel strip level meters) is the maximum
theoretical level that a digital signal can reach before clipping and other types of
distortion may be introduced.
dialog A window containing a query or message. You must interact with it (by pressing
a button) before you can continue.
digital A description of data that is stored or transmitted as a sequence of ones and
zeros. Most commonly, refers to binary data represented by electronic or
electromagnetic signals. All files used in Logic Pro are digital. Also see analog for
comparison.
Digital Full Scale See DFS.
disclosure triangle A small triangle you click to show or hide details in the user
interface.
distortion The effect that occurs when the limit of what can be accurately reproduced
in a digital signal is surpassed, resulting in a sharp, crackling sound.