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Green Noise vs Brown Noise: Understanding the Colored Sounds

Jan 23, 2024

When you come across terms like green noise and brown noise, you might wonder what exactly they are, and how they differ from each other. In the world of sound frequencies, these color-coded names refer to specific types of audio signals, each with its distinct characteristics. Green noise, also known as Anti-noise, is the inverse of pink noise that is specifically designed to cancel out unwanted sounds. The signal mirrors the frequency range of pink noise, but with an inverse phase, which results in near-total cancellation when combined. Brown noise, named after its discoverer Robert Brown, represents the random motion of particles in a fluid or gas as a result of their continuous collisions with each other. Also known as Brownian noise or red noise, brown noise has a frequency spectrum that decreases in power by 6dB per octave as it goes up the frequency range. To sum up, green noise refers to a sound that helps cancel out unwanted noise while brown noise represents the random motion of particles in the air.

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