White Noise - Flat on all frequencies Like the old TV white screen where all frequencies are flat, it reduces the sounds that your ears could receive, and gives you a better environment to relax or concentrate. ( making your ears less responsive to the other noise in the surrounding )
Pink Noise - Boost on Lower frequencies Covering higher frequencies so sharp noises / barks / traffic noises are less abrupt during your sleep
Brown Noise - Boost on Higher frequencies Brown Noise is often used in an office setting to drown out conversation noise, copy machines, or any sound generally in the lower frequencies.
The noises are tailored to the frequency of Elesis's speaker, so it could present a comfortable yet effective sound cancellation noise.
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