MARINE MAMMAL AUDITORY SYSTEMS: A SUMMARY OF AUDIOMETRIC AND ANATOMICAL DATA AND IMPLICATIONS FOR UNDERWATER ACOUSTIC IMPACTS

摘要

Audio gram: A graph of hearing ability conventionally displayed as frequency (abscissa) vs. sensitivity measured as sound pressure or intensity (ordinate) decibel (dB): A scale based on the log ratio of two quantities. It is commonly used to representsound pressure level. The value of the decibel depends upon the reference pressure used. Therefore the decibel level of sound is properly stated in the form of 'x' dB re 'y' microPa. The microPascal is a unit of pressure, In terms of intensity, 100 dB re 20 microPa in air equals approximately 160 dB re 1 microPa in water.