MicroMoth sampling rate cap with GPS sync FW
Hi everyone,
when reading the documentation on Github I see that the sampling rate is capped at 192 kHz for use with the dedicated GPS sync FW (https://github.com/OpenAcousticDevices/Application-Notes/blob/master/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings.pdf). When I look at the sample SETTINGS.txt (https://github.com/OpenAcousticDevices/Application-Notes/blob/master/Using_AudioMoth_GPS_Sync_to_Make_Synchronised_Recordings/SETTINGS.TXT) provided the parser seem to enforce 125 kHz. I am interested in recording bats and localizing them with synced MicroMoths and I was hoping to use a sampling rate of 384kHz. Is it not possible to sample that high when using the GPS hat?
Best wishes,
Felix
Hi Felix,
The maximum sample rate for AudioMoth-GPS-Sync is 192kHz. I've updated the example file. The AudioMoth doesn't have time to do the necessary processing at 384kHz.
However, you can make synchronised GPS recordings with the standard firmware at 384kHz. The synchronisation is typically then only +/- 1 ms rather than +/- 1 us. The application note below describes this approach:
We have an update coming out in the next few months that might improve this to about +/- 0.1ms.
Alex