From Longman Dictionary of Contemporary Englishwhite noiseˌwhite ˈnoise noun [uncountable] TCBnoise coming from a radio or television which is turned on but not tuned to any programme
Examples from the Corpus
white noise• When the waves are big, it can be deafening, a low-level white noise.• Yet the hostility of takeovers is a distraction, a sort of white noise.• A soft whir of white noise issued from a receiver and speakers near the operating table.• I lifted the receiver with caution, listening for the white noise of a long-distance connection.• The fans whir in the background, filling the locker room with white noise. 