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The other colors are similar to white noise, but with more energy concentrated at either the high or low end of the sound spectrum, which subtly changes the nature of the signal.

“The white phase concept also incorporates a new traffic signal, so that human drivers know what they are supposed to do. Red lights will still mean stop. Green lights will still mean go.

Ever wondered why white noise is white? It's not the only colour of noise you can get. ... The band of signal between 20 and 40Hz contains the same power at the band between 2000 and 2020Hz.