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Pulsed noise with peak centered at ~32kHz

Hello,

Recently I acquired an Audiomoth and I'm using it to record bat chatters. Maybe it's something usual, known or normal (I'm new to bioacoustics) but I'm a little bit confused regarding this kind of "noises" (on the next image, the sounds on the right after the bat chatter) the AudioMoth has recorded:

I had it recording during all the night, generating files every 5 minutes and the "sounds"are presents in all the files. On some files are just a couple of times but on others is present more times. For example:

As suggested I'm using a Sandisk Extreme 128GB. This is part o one of the WAV files with the sound recorded:

Any idea?

BR,

Carlos Carrizosa

2 comments

2 Comments

Alex Rogers

Nov 11

Hi Carlos, What recording settings were you using? Can you post the CONFIG.TXT file. I assume there was a high-pass filter set? It sounds like some sort of stridulating insect. It looks very similar to the sound of hands being rubbed together. You play it back in AudioMoth Play - https://play.openacousticdevices.info. Alex

Edited

Carlos Carrizosa

Nov 11

Replying to

Hi Alex.

Wonderful! I didn't know orthopters could make sounds at these frequencies.

I was not using the high-pass filter, but anyway, it would be any kind of grasshopper or bush cricket. There are many around the area where the AudioMoth is deployed and also explains why the sounds were more present during the sunset and first hours of the night.

Thanks for your support!

Carlos