How is white noise defined?

White noise is defined as a signal that contains all frequencies at the same amplitude, meaning that each frequency contributes equally to the overall sound. This characteristic of white noise makes it a unique auditory signal that is often used in various applications such as sound masking, sleep aids, and audio testing. The uniform distribution of frequencies in white noise results in a consistent sound that can effectively cover or "mask" other noises, making it useful in environments where background noise is a concern. Understanding this definition aids in recognizing the role of white noise in both auditory perception and hearing aid technology, where it may be used to enhance listening experiences by reducing distracting sounds.