background level
  • noun the general level of something such as noise or pollution which is always there
  • The combined levels of all phenomena which are present in any given physical apparatus or its surrounding environment, other than that which is specifically intended for observation or measurement.
  • synonym background brightness
  • On a screen or display, the luminosity present in the absence of a video signal. Used especially in the context of TVs. Also known as background level (1).

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