Triggered Recording is a method for recording bats. When the recorder picks up a signal above a specified frequency threshold and volume level (when a bat vocalises nearby), it will record audio data until the source of that signal is gone (the bat flies away).
Higher sample rates are needed to record bats than to record typical songbirds and amphibians (see also: Nyquist Frequency), and recordings made at higher sample rates take up more SD card space per minute of recording. Triggered Recording is a useful way to record full-spectrum audio of passing bats without wasting card space on silent periods in between bat passes.
This method is not practical for recording sounds in the audible range. The greater abundance of sounds in this lower range would mean the recorder would be constantly triggered, defeating the purpose of using triggered recording to save SD card space.
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