NOISE

in acoustics, any undesired sound, either one that is intrinsically objectionable or one that interferes with other sounds that are being listened to. In electronics and information theory, noise refers to those random, unpredictable, and undesirable signals, or changes in signals, that mask the desired information content. Noise in radio transmission is known as static, and in television it is called snow. White noise is a complex signal or sound that covers the entire range of component frequencies, or tones, all of which possess equal intensity.