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Frequencies >16kHz not depicted in spectrogram

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? I do not have any experience with this type of research, so any additional advice or comments are more than welcome!

Thanks in advance! Koen

2 comments

2 Comments

koen-pronk

Feb 21, 2022

Thank you for your quick response Andy, I will give it a try!

The Team

Feb 21, 2022

Hi Koen,

I'd be surprised if your speaker can vibrate at 100kHz, most are designed to have a frequency response up to 20kHz, unless you have a specialised tweeter speaker.

To help find configuration setting for the AudioMoth Configuration App have you seen our new Labs page, specifically the AudioMoth Filter Playground? Here you can upload recordings and experiment with different settings so you can get the perfect filter for your application.

Thanks,

Andy