Free Online Noise Generator

Which types of noise do what?

White Noise

White noise is a type of random noise or signal that has a flat power spectral density, meaning it has equal power across all frequencies. This means that white noise contains all frequencies at the same intensity level.

White noise is often described as a hissing, static-like sound and is commonly used as a background sound to mask other noises, promote relaxation or concentration, and aid sleep. It can be generated by an electronic device, such as a white noise machine, or created by combining all frequencies in equal amounts.

Some studies suggest that white noise may have potential benefits for sleep, as it can help mask background noises and promote a more consistent and restful sleep environment. However, more research is needed to determine its effectiveness for different individuals and in different contexts.

Pink Noise

Pink noise is a type of random noise or signal that has equal energy per octave. This means that it has a power spectral density that is inversely proportional to the frequency, similar to Brownian noise. However, unlike Brownian noise, the power of pink noise decreases at a rate of 3 dB per octave.

Pink noise is often referred to as "1/f noise" because its power spectral density follows a power law function of the form 1/f^α, where α is typically around 1. This means that as the frequency increases, the power of the noise decreases, but the rate of decrease is slower than with white noise or Brownian noise.

Pink noise is found in many natural phenomena, including the flicker of stars, the sound of waterfalls, and the electrical activity of the brain. It is also commonly used in audio engineering and music production to balance the frequencies in sound systems and equalizers, and it is often preferred over white noise or Brownian noise because it sounds more like natural ambient sound.

Pink noise has been studied for its potential benefits for sleep and relaxation, and some studies have suggested that it may have a calming effect on the brain and help to improve sleep quality. However, more research is needed to confirm these findings and to determine the optimal conditions for using pink noise for sleep and relaxation.

Brown Noise / Brownian Noise

Brownian noise, also known as Brown noise or red noise, is a type of random signal or noise that has a power spectral density inversely proportional to the frequency. This means that the power of the noise decreases as the frequency increases.

The name Brownian noise don't come from the color, it is named after botanist Robert Brown who found the Brownian motion pattern.

Brownian Noise is also used in ...

• Audio and Music: Brownian noise is often used in audio and music applications.
• Physics and Engineering: Brownian noise is used in physics and engineering to model various phenomena.
• Neuroscience: Brownian noise is used in neuroscience research to generate stochastic stimuli.
• Signal Processing: Brownian noise is used in signal processing applications.

For some individuals, Brownian noise can help mask background noise or distractions, making it easier to concentrate on tasks. This is because the noise can create a consistent, soothing background sound that helps to filter out other sounds in the environment.