https://pgc1signal.com/index.p....hp/optimal-hoover-lo
This study evaluated the soundscape of an urban zoo in a big regularity range (17.5-90,510 Hz) by calculating its typical noise levels (Leq ) and variability (the difference between highest and lowest peaks). Sound information had been gathered for 24 hour in 25 places (age.g., interior, outdoor, nearby the entertainment playground). The soundscape was not considered difficult for animal benefit when considering the average noise levels generally in most areas ( less then 77-dB noise pressure level [SP