Adobe 22012057DM User Guide - Page 84

D, E, from a high-bit resolution to a lower one for example

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SOUNDBOOTH CS3 80 User Guide codec (compressor/decompressor) An abbreviation for the data compression schemes used by the ACM, AVI, MPEG, and QuickTime formats and the analog-to-digital converters on some sound cards. (Note that codecs only compress file size; to compress audio amplitude, apply a compressor effect.) compressor An effect that reduces dynamic range by lowering amplitude when an audio signal rises above a specified threshold. For example, a compressor can compensate for variations in level caused by a vocalist who occasionally moves away from a microphone. Or, during mastering, a compressor can produce consistent levels for full program material, providing a solid, professional sound for web, video, and radio presentations. (See "mastering" on page 81.) crossfade A fade from one audio track to another. D DAC (digital-to-analog converter) The hardware that converts a digital audio or video signal into an analog signal that you can play through amplifiers and speakers. DAT (digital audio tape) A standard two-track digital audio tape format. DAT tapes are sampled at 16 and 24 bits, and 32,000, 44,100, and 48,000 samples per second. (The latter is often described as DAT quality.) DAW (digital audio workstation) A computer system used to edit, process, or mix audio. dBFS Decibels below full scale in digital audio. The maximum possible amplitude is 0 dBFS; all amplitudes below that are expressed as negative numbers. A given dBFS value does not directly correspond to the original sound pressure level measured in acoustic dB. DC offset Some sound cards record with a slight DC offset, in which direct current is introduced into the signal, causing the center of the waveform to be offset from the zero point (the center line in the waveform display). DC offset can cause a click or pop at the beginning and end of a file. decibel (dB) In audio, the decibel (dB) is a logarithmic unit of measurement used for amplitude. delay A time-shifted signal that you can mix with the original, nondelayed signal to provide a fuller sound or create echo effects. 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" on page 79 and "decibel (dB)" on page 80.) 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.

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SOUNDBOOTH CS3
User Guide
80
codec
(compressor/decompressor) An abbreviation for the data compression schemes used by the ACM, AVI,
MPEG, and QuickTime formats and the analog-to-digital converters on some sound cards. (Note that codecs only
compress file size; to compress audio amplitude, apply a compressor effect.)
compressor
An effect that reduces dynamic range by lowering amplitude when an audio signal rises above a
specified threshold. For example, a compressor can compensate for variations in level caused by a vocalist who
occasionally moves away from a microphone. Or, during mastering, a compressor can produce consistent levels for
full program material, providing a solid, professional sound for web, video, and radio presentations. (See “mastering”
on page 81.)
crossfade
A fade from one audio track to another.
D
DAC
(digital-to-analog converter) The hardware that converts a digital audio or video signal into an analog signal
that you can play through amplifiers and speakers.
DAT
(digital audio tape) A standard two-track digital audio tape format. DAT tapes are sampled at 16 and 24 bits,
and 32,000, 44,100, and 48,000 samples per second. (The latter is often described as
DAT quality.
)
DAW
(digital audio workstation) A computer system used to edit, process, or mix audio.
dBFS
Decibels below full scale in digital audio. The maximum possible amplitude is 0 dBFS; all amplitudes below
that are expressed as negative numbers. A given dBFS value does not directly correspond to the original sound
pressure level measured in acoustic dB.
DC offset
Some sound cards record with a slight DC offset, in which direct current is introduced into the signal,
causing the center of the waveform to be offset from the zero point (the center line in the waveform display). DC
offset can cause a click or pop at the beginning and end of a file.
decibel (dB)
In audio, the decibel (dB) is a logarithmic unit of measurement used for amplitude.
delay
A time-shifted signal that you can mix with the original, nondelayed signal to provide a fuller sound or create
echo effects.
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” on page 79 and
“decibel (dB)” on page 80.)
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.