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.
Notes. 1  By convention, sound has a level of 0 dB at a pressure intensity of 20 Î¼Pa and frequency of 1,000 Hz. 2  This is the generally agreed upon threshold of hearing for humans. 3  Sounds with intensities below this value are inaudible to (quite possibly) every human.