Noise Machine

How It Works

On Start the page builds a 4-second Float32Array of samples — plain random numbers for white noise, then filtered variants for pink and brown — loads it into an AudioBuffer, and loops it through a low-pass filter and a master gain with the Web Audio API. Colors are switched with a quick fade so the seam is never a click, and Start and Stop ramp the gain over one second instead of cutting it abruptly.

What the colors mean

Named after light, the colors describe how energy is spread across frequencies. White noise has the same energy in every frequency band, which sounds bright and hissy. Pink noise loses about 3 dB per octave — high bands get progressively less energy — so it sounds even and natural to the ear, like steady rain. Brown (Brownian) noise drops about 6 dB per octave, most of its energy sitting in the deep rumble. These are listening impressions, not lab measurements.

Why people use it for focus

A steady noise bed raises the floor under sudden sounds — doors, keyboards, conversation — so they arrive as variations in a wash instead of sharp interruptions. Many people find that makes open offices and shared apartments easier to work in; it is personal preference, not a medical treatment, and this page makes no health claims.

Volume safety and timer math

Noise is broadband energy, so keep the level low — comfortably quiet at your listening position, and the low-pass slider lets you trade brightness for softness without touching volume. The sleep timer is a simple countdown (minutes × 60 seconds) armed when selected; at zero it ramps the master gain to silence over about three seconds and stops the source. Background-tab throttling can delay that fade by up to a minute.

Frequently Asked Questions