Hi!
I am trying out some different settings with the AudioMoth configuration app to see the most suitable setup for recording bat species. After the device is configurated, I play sounds running from 1-100kHz over a speaker to test whether the device picks it up. Afterwards, I uploaded the WAV files to ARBIMON, to visualize the high frequency sounds.
I have attached my configuration and the spectrogram, as you can see, tones up until +- 16kHz are depicted, but tones with higher frequencies are not.
Do you have any ideas on what is going wrong? Does it have something to do with my configuration, or maybe it has something to do with the tones I am playing? Or my speaker?
Thanks in advance!
Koen
11 March 2022 2:11pm
Koen,
Hi - the config for the audiomoth looks fine (you could put a high-pass filter on to cover frequencies 12-96 kHz only). The scheduler is not set (you have 0 files per day), but presume this is just the screenshot.
The issue you have, though, is to do with your loudspeaker - presuming it is just a standard one. Standard music/computer speakers are tuned to human range of hearing and don't emit sound above around 20 kHz. They won't emit ultrasound to 100 kHz. For that you need specialised equipment. If you want to generate some ultrasound yourself though, just rub your fingers together, or jangle some keys near the Audiomoth!
Hope that's of some use, Carlos
Carlos Abrahams
Baker Consultants