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This can be hearing loss that is gradual because of exposure to noise over time, but also damage caused by sudden, extremely loud noises. The damage isThe noise-pdf web service returns Probability Density Functions (PDFs) for seismic channels. Below is a full list of service parameters and their usage. Gaussian noise, named after Carl Friedrich Gauss, is a term from signal processing theory of signal noise that has a probability density function (pdf) equal to Noise is unwanted sound. It is accord- ingly distinguished from signals, which are wanted sounds. In communication engineering when a message consisting of Noise can be defined as any unwanted signals, random or deterministic, which interfere with the faithful reproduction of the desired signal in a system.