Definitions for background signal
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Princeton's WordNet
background, background signal(noun)
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"
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"background signal." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/background signal>.