Hi all, I am trying to assess bat activity in number of calls per 1 second of recording. I am using AudioMoths and BatClassify. However, the smallest value to split to on the AudioMoth app is 5 seconds, and there is only a minimum amplitude trigger duration (so recordings above a certain threshold will trigger recording for at least 1 second but this could go on for longer?). Does anybody know how I could configure the devices to assess bat passes in calls per 1 second of recording? Thanks!
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To see this working, head to your live site.
As an alternative approach, Audacity can quite easily split a longer file into 1s files. Use Tools/Regular Interval Labels and the file will get numbered labels 1s long at 1s intervals (or whatever you set in the parameters page). Then use File/Export Multiple to split the file based on labels to export multiple 1s files into the folder of your choice. It is also possible to put these commands into a macro that can be run on a batch of files although I haven't actually tried this.
The new version of the Config App out today now has a '1 s' option.
The code to split the AudioMoth recordings is available here - https://github.com/OpenAcousticDevices/audiomoth-utils. If you can find a friendly programmer they'll be able to use it to generate a script to split the recordings into 1 second slices. Alternatively, we're going to release an update to the Config App next week which will support downsampling and we can look at adding a '1s' option to the Split AudioMoth Recordings' option.
Hi thanks for getting back to me, as that is only the minimum trigger duration I end up having recordings of varying lengths which makes analysis hard. Am I right in saying if you have an amplitude threshold you can't then split files? None of the recordings I have seem to get recognised by the split function if I have used an amplitude threshold (even if the recordings are 10+seconds)
I think essentially what I'm asking is whether you can have a maximum recording length when the amplitude threshold is reached or whether there is a way to to split recordings into 1 second files.