Could someone put a sample .wav file up of say 2 mins of bat sounds
as recorded by the unit to download please. I'd like to try some of my IQ software to
experiment with displaying/analysing the recordings please. - Thanks
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To see this working, head to your live site.
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Can the AM also be used as an Petterson m500?
and can the recorded data be analysed by Batexplorer?
Thanks for sharing these recordings guys. Really useful.
here are some audiomoth recordings from my garden https://drive.google.com/open?id=1MezOhpzuOFGGxeX4Rd2pkucu30SeLNiv
I have added two additional files, CHC18-1am2_20180406_203154.wav and CHC18-1p_20180406_203333.wav which are overlapping recordings made with the AudioMoth and a Petterson M500-384 using Bat Recorder - the AudioMoth at ground level angled up and the Petterson handheld. Comparing the recordings in detail the am recordings appear to have a better s/n ratio and pulses extend to higher frequencies. However on closer examination the Petterson pulses are much cleaner and the am pulses include a number of intermodulation distortion components which makes me think that the higher harmonics in these recordings are actually artefacts. In short the number of pulses caught by each system is pretty much the same and for identification purposes the am recordings are fine, but if you are more interested in looking at the detailed structure of pulses or making accurate measurements of duration/bandwidth/harmonic content, then there some issues with the audio moth which would need to be carefully resolved first. Probably be replacing the microphone with a signal generator and making accurate maps of frequency response, distortion and intermodulation, however I unfortunately no longer have the facilities to do this. And as I said earlier, for identification purposes these issues are not a problem.
Yes that worked thanks, I can display the traces with SpectraVue nicely. This is 23Khz to 96Khz. Theres a burble running at 52Khz that could be a street light or something.