Red noise ( Brownian noise ) is a noise signal that produces Brownian motion . Due to the fact that in English it is called Brown (Brownian) noise , its name is often translated into Russian as brown noise .
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| Red noise pattern | |
10 seconds of red noise | |
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Description
The spectral density of red noise is proportional to 1 / f², where f is the frequency. This means that at low frequencies, noise has even more energy than pink noise . Noise energy drops by 6 decibels per octave . Acoustic red noise is heard muffled compared to white or pink noise .
Getting
Red noise can be obtained by integrating white noise. That is, while ( discrete ) white noise can be obtained by randomly selecting each sample independently of each other, red noise can be obtained by adding a random variable to each sample of the signal to obtain the next sample.
See also
- Noise colors