(acoustics) The pervasive noise associated with a given environment, being usually a composite of sounds from sources both near and distant.
Sounds, other than those emitted by a target, surrounding a listener or mechanical sound detection system (such as sonar) that interfere with hearing or locating the sounds emitted by a target.
See the Introduction, Abbreviations and Pronunciation for further details.
The all-encompassing, average background noise associated with a given environment, often a composite of sounds from many sources near and far, of many different types, e.g., the general background noise in a neighborhood or in an auditorium.