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Adobe Handleiding Adobe Audition 3.0 Manual

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ADOBE AUDITION 3.0
User Guide
275
destructive editing Editing (such as cutting and pasting, or effects processing) that changes the original audio data.
For example, in destructive editing, a change in audio volume alters the amplitude of the original audio file. In Adobe
Audition, Edit View is a destructive editing environment; however, edits do not permanently change audio until you
save a file.
DirectX A development platform designed by Microsoft that provides an open standard for audio plug-ins. Plug-ins
based on this standard can be used by any application that supports DirectX, such as Adobe Audition.
dithering Adds small amounts of noise to a digital signal so that very quiet audio remains audible when you convert
from a high bit resolution to a lower one (for example, when converting from 32-bit to 16-bit). Without dithering,
quiet audio passages such as long reverb tails may be abruptly truncated.
dry Describes an audio signal without any signal processing such as reverb; the opposite of wet.
DSP (digital signal processing) The process of transforming a digital audio signal by using complex algorithms.
Examples include filtering with equalizers, and effects processing with reverbs and delays.
DVD A storage medium similar to a CD, but with much higher bandwidth and storage capabilities. Audio in DVD
movies generally uses a 96-kHz sample rate and a 24 bit depth.
dynamic range Audio amplitude range, from quietest troughs to loudest peaks. See also “bit depth (or bit
resolution)” on page 273 and “decibel (dB)” on page 274.
E
equalization (EQ) The process of increasing or decreasing the amplitude of specific audio frequencies relative to the
amplitude of other audio frequencies.
expander Increases dynamic range by lowering amplitude when an audio signal falls below a specified threshold
(the opposite of a compressor). For example, an expander can be used to lower the level of background noise that
becomes audible when a musician stops playing.
F
FFT (Fast Fourier Transform) An algorithm based on Fourier Theory that Adobe Audition uses for filtering, Spectral
View, and Frequency Analysis features. Fourier Theory states that any waveform consists of an infinite sum of sine
and cosine functions, allowing frequency and amplitude to be quickly analyzed. Higher FFT sizes create more precise
results but take longer to process.
frequency Describes the rate at which a sound wave vibrates, measured in cycles per second, or hertz (Hz). A cycle
consists of a single, repeated sequence of pressure changes, from zero pressure, to high pressure, to low pressure, and
back to zero. A sound wave’s frequency determines its pitch: high frequency equals high pitch, and low frequency
equals low pitch. (See also “Waveform measurements” on page 8.)
H
hertz (Hz) Cycles per second. A unit of measurement that describes the frequency of a sound. (See “frequency” on
page 275.)
I
interpolate To estimate the values of data points between known data points. Interpolation is used when new data
must be generated to fill in areas where values are unknown.
… 280 …


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