Sheriff Jack W. Brandes. To serve and protect the citizens of Austin County and the great State of Texas and to preserve and protect the. Constitution of the United States of America, especially the Second Amendment, the Right to Bear Arms..
Integrating Sound Level Meter. In atmospheric sounding and noise pollution, ambient noise level (sometimes called background noise level, reference sound level, or room noise level) is the background sound pressure level at a given location, normally specified as a reference level to study a new intrusive sound source.
The Standard assumes that ambient noise mask-. ing of signals below reference equivalent threshold. levels is tolerable. This assumption is not appro-. priate in applications where hearing thresholds. lower than reference equivalent threshold levels. must be measured.