White noise has constant mean, constant variance, and zero autocovariance at every nonzero lag. Gaussian white noise additionally has jointly Gaussian coordinates and is therefore independent across time.
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White noise is a type of sound signal that contains equal intensity at different frequencies, resembling a constant hiss or static. It is often compared to white light, which contains all visible colors at equal intensity. In audio terms, white noise is produced by combining sounds of all different frequencies together, creating a steady, unvarying sound that can mask other noises.