White Noise Generator

The acoustics of white noise: a flat, full spectrum

White noise is defined by one simple property: equal energy at every audible frequency, from the deep rumble around 20 Hz up to the highest harmonics near 20,000 Hz. Because human hearing perceives each higher octave as carrying more energy, a flat spectrum sounds bright and slightly hissy, like radio static or a fan on high. This even distribution is what gives white noise its main practical power: it raises the noise floor evenly across the spectrum, so sudden sounds, a door, a voice, a passing car, have less contrast to stand out against. The effect is often called auditory masking.

What the evidence suggests

Research suggests steady broadband noise can help some people fall asleep faster and stay asleep in noisy environments by smoothing over disruptive peaks. Findings on attention are more mixed: many people find a constant background hiss helps screen out an unpredictable office or street, while others find its brightness fatiguing over long stretches. White noise is also widely used to soothe infants, and many parents find it settles fussing, likely because it loosely resembles the muffled sound heard in the womb. None of this is a cure for insomnia or a clinical treatment, but as a low-cost masking tool it has a long track record.

Who it suits and how to set it

White noise tends to suit light sleepers in apartments, shift workers sleeping by day, and anyone needing to blanket intermittent noise. If the hiss feels too sharp, pink or brown noise shift energy toward the lower frequencies and feel warmer. Set the volume just loud enough to cover the disturbance you want to mask and no louder, roughly conversational level; pushing it high all night is unnecessary and may strain hearing. A sleep timer of 30 to 60 minutes works well if you only need help drifting off, while continuous play suits those who wake easily.

FAQ

Is white noise safe to play all night?

For most people, yes, at a moderate volume. Keep it at a comfortable level rather than maximum, and position the source away from the pillow.

White noise or brown noise for sleep?

Many people find brown noise's deeper, softer tone more relaxing, while white noise masks high-pitched disturbances more completely. It is worth trying both.

Can it help with focus?

Some find steady noise aids concentration by masking distractions, though results vary from person to person.