Red noise
Encyclopedia : R : RE : RED : Red noise
| Colors of noise |
|---|
| White noise |
| Pink noise |
| Brown/Red noise |
| Grey noise |
| Black noise |
In science, red noise, Brownian noise, or brown noise is the kind of signal noise produced by Brownian motion.
- [Brown noise sample] ([file info])
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- * Problems listening to the file? See [Media helpmedia help].
Explanation
The graphic representation of the sound signal mimics a Brownian pattern. Its spectral density is proportional to 1/f2, meaning it has more energy at lower frequencies, even more so than pink noise. It decreases in power by 6 dB per octave and, when heard, has a "damped" or "soft" quality compared to white and pink noise. See also purple noise, which is a 6 dB increase per octave.
Production
Brown noise can be produced by integrating white noise. That is, whereas (digital) white noise can be produced by randomly choosing each sample independently, brown noise can be produced by adding a random offset to each sample to obtain the next one.
See also
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