Acoustic Deterrent Device - Non-lethal management measures that work by introducing noise.
Auditory weighting function - Transforms sound measurements, taking into account the frequency-dependent aspects of auditory sensitivity.
dB - Decibels
dB re 1 μPa @ 1 m - Unit for SPL, decibels at reference pressure of 1 micro Pascal, usually referred from measurements back to 1 meter from the sound source.
dB re 1 µPa2s - Unit for SEL, the integral over time for squared sound pressure.
CEE - Controlled Exposure Experiment
Fundamental frequency - The lowest frequency for a given sound.
Good Environmental Status (GES) - Seas which are clean, healthy and productive within their intrinsic conditions, and the use of the marine environment is at a level that is sustainable, thus safeguarding the potential for uses and activities by current and future generations.
HF - High Frequency
Hz / kHz - Hertz / kiloHertz
LF - Low Frequency
Pa / µP - Pascals / microPascals
PAM - Passive Acoustic Monitoring
Predictive habitat modelling - The use of computer algorithms to predict the distribution of a species across geographic space and time, based on absence/presence and environmental data.
PTS - Permanent Threshold Shift
RL - Received Level
RMS - Root Mean Square
Sensation Level - A measure in decibels of the intensity of a sound that is above an individual's minimum hearing threshold.
SEL - Sound Exposure Level The metric assessed for the accumulation of sound exposure (usually measured over 24 hours), this takes into account the duration and the source level as well as the hearing sensitivity of marine mammal through auditory weighting.
SELSENS - Sound exposure sensation level; The SEL referenced to the test subject's hearing threshold, from Götz and Janik (2013).
Signal - In the context of the report, the artificial sounds produced by an ADD that have specific frequency content, pulse rate and rise time.
SL - Source Level
SPL - Sound Pressure Level
Startle response - An unconscious defensive response to sudden or threatening stimuli, such as sudden noise.
TAST - Targeted Acoustic Startle Technology
TTS - Temporary Threshold Shift
VHF - Very High Frequency