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You can use brown noise for blocking ambient sounds while studying or meditating. 3 hours of gentle night rain rain sounds for relaxing sleep insomnia meditation study ptsd. Sleep Well Night Rain From The Tropics 8 Hours Of White Noise In science brownian noise sample help info also known as brown noise or red noise is the kind of signal noise produced by brownian motion hence its alternative name of random walk noise the term brown noise does not come from the color but after robert brown who documented the erratic motion for multiple types of inanimate particles in water. Brown noise rain . Smoothed brown noise 8 hours remastered for relaxation sleep. For the engineer white noise is a signal that contains all frequencies in equal proportion or in other words a signal whose spectrum is flat. Brown noise is a useful sound masking tool that can block out external sounds and distractions and be used in many different ways. Here s a black screen version of our 12 hour brown n...