Noise

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  • Interference of an electrical or acoustical nature. Random noise is a desirable signal used in acoustical measurements. Pink noise is random noise whose spectrum falls at 3 dB per octave: it is useful for use with sound analyzers with constant percentage bandwidths.
  • Any undesired sound. By extension, noise is any unwanted disturbance within a useful frequency band, such as undesired electric waves in a transmission channel or device. When caused by natural electrical discharges in the atmosphere, noise may be called static.
  • An erratic, intermittent, or statistically random oscillation.
  • In electrical circuit analysis, that portion of the unwanted signal which is statistically random, as distinguished from hum, which is an unwanted signal occurring at multiples of the power-supply frequency. If ambiguity exists as to the nature of the noise, a phrase such as acoustic noise or electric noise should be used. Since the above definition are not mutually exclusive, it is usually necessary to depend on context for the distinction.
  • Interference of an electrical or acoustical nature. Random noise is a desirable signal used in acoustical measurements. Pink noise is random noise whose spectrum falls at 3 dB per octave: it is useful for use with sound analyzers with constant percentage bandwidths. Unwanted, bothersome, or distracting sound. Source: http://www.owenscorning.com/around/sound/glossary.asp
  • Product-level or product-volume changes occurring during a test that are not related to a leak but may be mistaken for one.
    Source: Terms of the Environment


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