Detectors 062
Detectors 062 : Particle Detectors: (4.2) Bat Detector: (4) Other Bat Detector Types: (4.1) Zero Crossing Analysis: ZCA is best known as an add-on device to the Anabat bat detector. The original bat calls are digitised and the zero crossing points used to produce a data stream which is recorded on a Compact Flash card. There are sophisticated timing controls and the device can be set to respond to bat calls, so that many hours of recording are available in unmanned situations. The purpose of ZCA is to reduce the amount of data which must be recorded to the memory and may be considered as a simple form of lossy data compression. Historically, to achieve long recording times, such information reduction has been necessary due to memory capacity limitations and memory cost. The solid state ZCA recording is analysed by custom software to produce a time/frequency plot of each call which can be examined for species recognition in a similar way to FD or TE recordings
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