White noise is a noise whose amplitude is constant throughout the audible frequency range. It is described as "white" by analogy with white light is a mixture of all wavelengths of visible light. White noise is fairly easy to produce - often occurs with a random noise generator in which all frequencies are equally probables-. The sound of white noise is similar to the sound of steam escaping from an overheated radiator. The ear is aware of a lot of high-frequency sounds in white noise, because the ear is more sensitive to high frequencies.