Biophysical attenuation
Biophysical attenuation occurs when objects in the environment absorb or reflect sound waves before they reach the detector, resulting in a decrease in sound intensity or a change in its path.
Body
The flattest and often loudest part of the call.
Call
A single pulse of sound made by a bat.
Call sequence
A series of pulses from a bat recorded in succession by the detector.
Call shape
Refers to the two-dimensional shape of the call when displayed on a time x frequency chart. Generally described as being either constant frequency (CF), frequency modulated (FM) or quasi-constant frequency (qCF) calls.
CF
Constant Frequency, see Constant Frequency
Characteristic section
The right hand side of the body of the call.
Compressed / real time
In ‘compressed’ mode the spaces between each call pulse are removed from view. This allows more pulses to be viewed on the screen but removes information about the timing of pulses. Real time refers to displaying the calls and blank spaces between them.
Constant frequency (CF)
A call with a predominantly flat shape at a constant frequency – “pure tone” call. Bats in the genus Hipposideros and Rhinolophus make constant frequency calls, sometimes with frequency modulated components.
Continuous Recording Mode
The continuous recording mode will record continuously, starting as soon as this mode is selected, but files will only be saved if they pass the trigger settings.