English
Suomi
A noise colour says how a sound's power changes as pitch rises. Brown noise falls fastest and sounds deepest, pink noise is balanced, white noise is level per frequency and sounds bright, and blue and violet rise and sound sharp. Green and grey are looser names without strict definitions.
The slopes
Measured as power at each single frequency, the standard colours fall or rise by a fixed amount each time the frequency doubles:
- Brown noise falls by about 6 dB. Deep and soft.
- Pink noise falls by about 3 dB. Even and full.
- White noise stays level. Bright and hissy.
- Blue noise rises by about 3 dB. Thin and airy.
- Violet noise rises by about 6 dB. Sharp.
Why these pages show different numbers
Hush measures each sound in octave bands, and every octave holds twice as many frequencies as the one below it. That adds about 3 dB per octave to every colour: measured this way, pink noise is level, white noise rises about 3 dB per octave and brown noise falls about 3 dB.
Names without a strict definition
Grey noise is shaped to how people hear, and green noise has no agreed meaning at all. Both are covered in their own guides, and what colour noise is best for sleep turns all of this into a choice.
Hush's noises, darkest to brightest
Between 2 and 12 kHz, the darkest noise in Hush, Amber static, falls 5.8 dB per octave; the brightest, Violet static, rises 6.1 dB per octave. If you are unsure where to start, start in the middle with pink noise and move darker if it feels sharp or brighter if it feels muffled.
Band by band, in numbers
| Band | Deep brown | Violet static | Difference |
|---|---|---|---|
| 2 kHz | −14.5 dB | −16.8 dB | −2.3 dB |
| 2.5 kHz | −15.7 dB | −14.9 dB | +0.8 dB |
| 3 kHz | −16.7 dB | −13.2 dB | +3.5 dB |
| 4 kHz | −18.1 dB | −10.5 dB | +7.6 dB |
| 5 kHz | −19.2 dB | −8.4 dB | +10.8 dB |
| 6 kHz | −20.0 dB | −6.7 dB | +13.3 dB |
| 8 kHz | −21.2 dB | −4.1 dB | +17.1 dB |
| 10 kHz | −22.4 dB | −2.5 dB | +19.9 dB |
| 12 kHz | −23.5 dB | −1.6 dB | +21.9 dB |
