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- The amount of noise in a room without any primary sound. The background noises in a room (HVAC, traffic noise, etc.). Source: Church Audio & Acoustics Glossary
- All-encompassing sound at a given place, usually a composite of sounds from many sources near and far. Source: Glossary of Terms in Noise Control Engineering
- The composite, all-inclusive sound that is associated with a given environment (usually from many sound sources), excluding the analysis system’s electrical noise and the sound source of interest, which in most cases presented herein is aircraft. Source: http://www.volpe.dot.gov/acoustics/docs/1990-1999/1999-1.pdf
- The composite of airborne sound from many sources near and far associated with a given environment. No particular sound is singled out for interest. Source: http://www.owenscorning.com/around/sound/glossary.asp
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