a)
Figure 1 Example of amplitude
cutoffs of a) -37dB, b) -34dB, c) -31 dB for a single Crinia
signifera template. Orange indicates “on” (call) regions and blue
indicates “off” (non-call) regions.
The lower and upper bounds of the template’s frequency limits were
manually chosen to capture as much of the call as possible, while
minimising potential overlap with common noise sources (e.g. crickets).
Most templates were constructed with a window size of 512 samples.
Templates for C. signifera used a window size of 256 samples to
improve the resolution of the species’ highly pulsatile call. Both the
frequency limit and the window size affect the number of on and off
points in the template and, therefore, the template’s speed. ForL. tasmaniensis, we trialled templates with both window sizes,
but chose to use the 512 sample templates as they showed the call’s
structure more clearly.