Adobe AUDITION 3 User Manual page 94

Generate noise
The Noise command lets you generate random noise in a variety of colors. (Traditionally, color is used to describe
the spectral composition of noise. Each color has its own characteristics.) Generating noise is useful for creating
soothing sounds like waterfalls (perfect for use with the Binaural Auto-Panner function of Adobe Audition) and for
generating signals that can be used to check out the frequency response of a speaker, microphone, or other audio
system component.
1 Place the cursor where you want to insert the noise. Or, if you want to replace part of the existing waveform, select
the desired range of audio data.
Choose Generate > Noise.
2
3 Set options as desired, and click OK.
Noise options
Specifies a color for the noise:
Color
• Has a spectral frequency of 1/f
Brown noise
low-frequency content. Its sounds are thunder- and waterfall-like. Brown noise is so called because, when viewed,
the wave follows a Brownian motion curve. That is, the next sample in the waveform is equal to the previous sample,
plus a small random amount. When graphed, this waveform looks like a mountain range.
•
Has a spectral frequency of 1/f and is found mostly in nature. It is the most natural sounding of the
Pink noise
noises. By equalizing the sounds, you can generate rainfall, waterfalls, wind, rushing river, and other natural sounds.
Pink noise is exactly between brown and white noise (hence, some people used to call it tan noise). It is neither
random nor predictable; it is fractal-like when viewed. When zoomed in, the pattern looks identical to when zoomed
out, except at a lower amplitude.
•
Has a spectral frequency of 1, meaning that equal proportions of all frequencies are present. Because
White noise
the human ear is more susceptible to high frequencies, white noise sounds very hissy. Adobe Audition generates
white noise by choosing random values for each sample.
Specifies a style for the noise:
Style
•
Generates noise by using three unique noise sources and spatially encoding them to seem as if one
Spatial Stereo
comes from the left, one from the center, and one from the right. When you listen to the result with stereo headphones,
your mind perceives sound coming from all around. To specify the distance from center of the left and right noise
sources, enter a delay value in microseconds. About 900 to 1000 microseconds correspond to the maximum delay
perceivable. A delay of zero is identical to monaural noise, where left and right channels are the same.
•
Independent Channels
channel's noise is completely independent of the right channel's noise.
•
Generates noise by using a single noise source, with the left and right channels set equally to that source.
Mono
• Generates noise by using a single noise source (similar to the Mono option). However, the left channel's
Inverse
noise is exactly inverse of the right channel's noise. When you listen to the result with stereo headphones, your mind
perceives sound coming from within your head instead of from somewhere externally.
Specifies the intensity of the noise on a scale of 2 to 40. At higher intensities, the noise becomes more
Intensity
erratic and sounds harsher and louder.
Determines the number of seconds of noise that Adobe Audition generates.
Duration
, which means, in layman's terms, that the noise has much more
2
Generates noise by using two unique noise sources, one for each channel. The left
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