There is noise with color names other than 'white noise'

The noise used to improve concentration is called 'white noise,' but there are other noises that bear the name of the color. Scientific American, a scientific magazine, has released a movie on the YouTube channel to see what it sounds like.

Noise has its own randomness and can be divided into several types according to the pattern.

For example, the menacing voice of 'Shah' from a cat ...

It looks like this when shown in waveform.

This is 'white noise'. The name white noise comes from the fact that white light contains a wide range of frequencies in the visible range and contains equivalent light, and because it contains equal frequency components in the audible range.

Just as light of different frequencies has different color names, noise with different frequency components is called different color names. What exists is 'violet noise'

'Blue noise'

'Brownian noise'

And the sound like 'shhh' that shows animals and children to be quiet ...

It is called 'pink noise'.

It is often said that 'white noise' has the effect of improving concentration, but because the human ear is sensitive to high frequencies, it can sometimes be heard as jarring high-pitched sounds. On the other hand, 'pink noise' has a strong low frequency and resembles the sound of being in the womb of the mother, so it is said to be heard as a more natural and calming sound.