Hello,
Hoping to use my Audiomoth to capture frog call at a local pond. Normally I use a Zoom F3 and an external mic. I tested the Audiomoth, and notice the captures have a lot of very high frequencies, almost a hissing. I just wondered if it's better to filter on the moth, or just filter in post?
You can apply filters on the AudioMoth iteself. However, these are really intended to be used with amplitude triggers so in most cases it is more convenient to filter recordings in post processing. Audio quality on AudioMoth will generally be of lower quality than a dedicated audio recorder due to the trade-offs in placing the microphone and SD card on the same PPCB. However, using the lowest feasible sample rate will generally increasse recording quallity and decrease self-noise from the internal microphone.
The filters that the AudioMoth itself applies are 1st-order Butterworth filters. Typical audio post-processing software will offer higher-order filters with a sharper cut-off.