White Noise Generator Generate white noise for sleep, focus, relaxation, or sound masking.

White noise is generated using the Web Audio API's AudioBuffer filled with random samples. A buffer of 2 seconds is created at the AudioContext's sample rate. Each sample is set to Math.random() * 2 - 1, producing uniformly distributed random values in the [-1, 1] range. This creates noise with equal power spectral density across all frequencies — the definition of white noise. The buffer is played using an AudioBufferSourceNode with loop = true for gapless continuous playback. A GainNode controls volume. The sleep timer uses setTimeout to call source.stop() after the specified duration. The power spectral density of the output is flat (±3 dB) across the audible range 20 Hz - 20 kHz. Fade-in and fade-out transitions use GainNode.linearRampToValueAtTime() for smooth starts and stops.