[How To] Record the Elusive Colors of Noise

While noise is by definition derived from a random signal, it can have different characteristic statistical properties corresponding to different mappings from a source of randomness to the concrete noise.

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Things you need:


taperecorder_Full[1]– Tape recorder with microphone
– Fingers to press record on tape recorder (In the case of severe finger loss, a toe can be used in its place)
– Blank tape (90min preferably)

What to Do and How to listen for Colors of Noise:

White Noise
White noise is a signal, named by analogy to white light, with equal energy per cycle (hertz).This produces a flat frequency spectrum in linear space.

Pink Noise
The frequency spectrum of pink noise is flat in logarithmic space; it has equal power in bands that are proportionally wide

Red noise
In fields that adopt precise definitions, the terminology “red noise”, also called Brown noise or Brownian noise, will usually refer to a power density which decreases 6 dB per octave with increasing frequency (density proportional to 1/f 2) over a frequency range which does not include DC (in a general sense, does not include a constant component, or value at zero frequency).

Blue noise
Blue noise is also called azure noise. Blue noise’s power density increases 3 dB per octave with increasing frequency (density proportional to f ) over a finite frequency range

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Violet noise
Violet noise is also called purple noise. Violet noise’s power density increases 6 dB per octave with increasing frequency(density proportional to f 2) over a finite frequency range. It is also known as differentiated white noise.

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Grey noise
Grey noise is random pink noise subjected to a psychoacoustic equal loudness curve (such as an inverted A-weighting curve) over a given range of frequencies, giving the listener the perception that it is equally loud at all frequencies.

Orange noise
Orange noise is quasi-stationary noise with a finite power spectrum with a finite number of small bands of zero energy dispersed throughout a continuous spectrum.

Black noise
Black noise is also called silent noise. Found when everything is silent.

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