by Ron Birkla, Director at AV-ation In any airport or train station, the ambient noise level can vary dramatically from very low to very high based on the number of people in the space. Therefore, the volume of paging and announcements must be flexible, and automatically raise or lower to compensate, or passengers won’t get the critical information they need.   The way this is typically done is by mounting “Ambient Noise Sensing Microphones” in strategic areas that will sense