An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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background noise
  نوفه‌ی ِ پس-زمینه، ~ زمینه  
nufe-ye paszaminé, ~ zaminé
Fr.: bruit du fond  

An unwanted signal in a system which is producing or recording a signal.
For instance, a randomly fluctuating signal superimposed on the signal from a cosmic radio source.

See also: → background; → noise.