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.
For instance, using the example of two machines each emitting a noise level of 90 dB: 1  Step 1: The numerical difference between the two levels is 0 dB (90-90= 0), using the first row. 2  Step 2: The number corresponding to this difference of 0, taken from the right hand column, is 3. 3  Step 3: Add 3 to the highest level, in this case 90.