Adobe 22011292 User Guide - Page 205

ADOBE AUDITION 191 User Guide Generate Noise dialog Adobe Audition inserts noise from the current playbar cursor position, pushing any following audio back in time, and thereby lengthening the duration of the waveform. Selecting an area and generating noise replaces the selection, deleting existing audio. Use noise as the basis for creating weird sound effects, for creating soothing sounds like waterfalls (perfect for use with Adobe Audition's Binaural Auto-Panner function), or for generating signals that can be used to check out the frequency response of a speaker, microphone, or other audio system component. Color Adobe Audition has the following noise options: • Brown noise has a spectral frequency of 1/f^2. This means, in layman's terms, that there's much more low-end, and there are many more low-frequency components to the noise. This results in thunder- and waterfall-like sounds. 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. • Pink noise has a spectral frequency of 1/f and is found mostly in nature. It is the most natural sounding of the 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 (which is why some people used to call it tan noise, but pink was more appealing). It is neither random nor predictable. It has a fractal-like nature when viewed. When zoomed in, the pattern looks identical to when zoomed out, except at a lower amplitude. • White noise has a spectral frequency of 1. In other words, equal proportions of all frequencies are present. Because 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. Style Choose among the following styles: • Spatial Stereo: If you choose this option, Adobe Audition generates Spatial Stereo noise by using three unique noise sources, and spatially encodes them to appear as if one is coming from the left, the other from the center, and the last from the right. When you listen to it with stereo headphones, your mind perceives sound coming from all around, not just in the center. 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: Select this option to tell Adobe Audition to generate noise by using two unique noise sources, one for each channel. The left channel's noise is completely independent of the noise of the right channel.