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background signal is a noun meaning "extraneous signals that can be confused with the phenomenon to be observed or measured". It carries one recorded sense.
extraneous signals that can be confused with the phenomenon to be observed or measured
“they got a bad connection and could hardly hear one another over the background signals”
Definitions, synonyms and semantic relations for background signal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.