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Noise-induced hearing loss (NIHL) is a hearing impairment resulting from exposure to loud sound.People may have a loss of perception of a narrow range of frequencies or impaired perception of sound including sensitivity to sound or ringing in the ears. [1]
Received noise power, noise at a telecommunications receiver; Circuit noise level, ratio of circuit noise to some reference level; Channel noise level, some measure of noise in a communication channel; Noise-equivalent target, intensity of a target when the signal-to-noise level is 1 [2]
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Johnson–Nyquist noise (thermal noise, Johnson noise, or Nyquist noise) is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied voltage.
In signal processing, white noise is a random signal having equal intensity at different frequencies, giving it a constant power spectral density. [1]
Different types of noise are generated by different devices and different processes. Thermal noise is unavoidable at non-zero temperature (see fluctuation-dissipation theorem), while other types depend mostly on device type (such as shot noise, [1] [3] which needs a steep potential barrier) or manufacturing quality and semiconductor defects, such as conductance fluctuations, including 1/f noise.