A clock radio that includes a white noise machine.

A white noise machine is a device that produces a sound that is random in character, somewhat like air escaping from a balloon. They generally do not produce actual white noise, which has a harsh sound, but more often pink noise, whose power rolls off at higher frequencies, or other colors of noise. They are often used to protect privacy by masking distant conversations, say in a psychiatrist's waiting room, and are also sold as sleep aids. Such machines often can produce other soothing sounds, such as rain, wind, and ocean waves. ImageMetadata File history File links Download high resolution version (2500x2683, 1215 KB) Summary Digital clock of a premium design. ... ImageMetadata File history File links Download high resolution version (2500x2683, 1215 KB) Summary Digital clock of a premium design. ... A premium digital clock radio with digital tuning. ... Four thousandths of a second of white noise White noise ( ▶ (help· info)) is a random signal (or process) with a flat power spectral density. ... Pink noise, also known as 1/f noise, is a signal or process with a frequency spectrum such that the power spectral density is proportional to the reciprocal of the frequency. ... There are many forms of noise with various frequency characteristics that are classified by color. Some have well-defined technical definitions, while others are colloquial or jokes. ... Privacy is the ability of an individual or group to stop information about themselves from becoming known to people other than those they choose to give the information to. ... In an ideal situation, sleep should be undisturbed and experienced in the same room every night Sleep is the regular state of natural rest observed in all mammals, birds and fish. ...

Some claim employing white noise machines in offices improves productivity by reducing distractions, though this use is controversial.