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Anyone uploaded the new 1.4 Audiomoth flash file yet? Just wondering if anyone can tell me some good settings for recording UK Bat?

2 answers2 replies

4 Comments

Jun 11, 2020

The values in here - https://github.com/OpenAcousticDevices/White-Papers/blob/master/Using_AudioMoth_with_Filtering_and_Amplitude_Threshold_Recording.pdf - 50kHz high pass filter with an amplitude threshold of 512 should work well. Increase the threshold to 1024 if there is significant background noise.

Alex Rogers

Jun 17, 2020

Replying to

It will attenuate calls below this frequency so you might lose some calls depending on how close the bat passes to the AudioMot but the roll-off of the filter is quite slow. The real aim is to ensure that low-frequency background noise is attenuated so that you can set a sufficiently low amplitude threshold to not trigger on this noise. This will depend a bit on the environment - e.g. wind noise, running water, etc. You could probably achieve the same effect with a much lower frequency around the call frequencies that you are interested in.