The Jargon File (version 4.4.7, 29 Dec 2003):

lost in the noise
 adj.

    Syn. lost in the underflow. This term is from signal processing, where
    signals of very small amplitude cannot be separated from low-intensity
    noise in the system. Though popular among hackers, it is not confined to
    hackerdom; physicists, engineers, astronomers, and statisticians all use
    it.


The Free On-line Dictionary of Computing (30 December 2018):

lost in the noise

   Synonym lost in the underflow.  This term is from signal
   processing, where signals of very small amplitude cannot be
   separated from low-intensity noise in the system.  Though
   popular among hackers, it is not confined to hackerdom;
   physicists, engineers, astronomers, and statisticians all use
   it.

   [Jargon File]