The Colour of Noise

The idea of noise having these different colour profiles is something intriguing to me. Especially as each colour can help us function or relax in different ways.

No doubt you have heard about white noise relating to sleep? Perhaps you even use it yourself, or a loved on does? Well, it actually might not be the best form of sound for that; many find pink noise more soothing.

What I’m saying is that these various sound types all have differing qualities and impacts on the brain but what is meant when we refer to one colour over the other, and how could each be used to help you?

Here are a few simple examples.

White

The most common and well-known noise in colour form, is white. The sound of a fan or the gentle hum of an air conditioner are examples of white noise.

From a technical viewpoint; this type of sound comes down to energy distributed across all frequencies equally, it’s a flat frequency spectrum essentially.

Whilst that might not mean much if you are unable to visualise, it essentially drowns out other types of sound that could be over-whelming or inadvertently stimulating the brain. It’s actually this lack of fluctuation and its audible consistency that can make it an ideal sleep aid, especially for those struggling with anxiety, sensory issues or insomnia.

Pink

White and pink noise can overlap, I used the example of a fan before but depending on a number of factors; that could actually be either. However, the difference is how the energy is distributed. So, pink noise consists of all frequencies like white, but the energy isn’t distributed across all equally. Pink noise is more powerful at the lower end making it have a deeper bass-like sound. Examples could include a heartbeat or wind.

Where pink noise can outdo white noise is in how they are found to stabilise brain waves. The benefit is more in the having fallen asleep than the trying to drift off, the sound specifically promotes deeper more stable sleep; leading to the listener to typically awaken feeling more rejuvenated.

Red

Red noise, also known as brown noise; is essentially pink but with even more oomph (technical term) on the lower frequencies. Essentially, it’s a hugely bass like sound. Think thunder or really strong water flows. Interestingly, brown noise didn’t get its name from the colour but rather a botanist called Robert Brown.

I don’t know what research shows in regards to red/brown noise; in-fact it all seems inconclusive but anecdotally I find it helps me to shut out external factors and focus when writing or programming.

Blue

The opposite to brown noise. Examples include more high-pitched fluctuating sounds; hissing type noises. They’re noises which are comprised of treble with no real bass-like element. Probably more likely to put you on edge than actually relax you in any way.

Black

Silence.

The complete lack of noise, or the act of total noise cancellation. It is notably rare.