Stereo USB Input?

[KarlBystrak]

I just finished building my first BirdNet-Pi device from a pi4. Now I am looking for a USB sound card to do stereo input. I built my own microphones using 2 x AOM-5024L-HD-R Where I wired the two mics to a single TRS 1/4 audio plug. (One MIC's + Wires on TIP, one MIC's + wires on RING, and both MIC's - wires together on SLEEVE). I already tried the UGREEN External USB Sound Card Jack USB Adapter and it doesn't seem to be stereo? I am not really sure how to determine if the Pi is getting a stereo or mono signal. How would i check that? And does anyone have any suggestions on other adapters to try?

Thanks in advance!

[alexbelgium]

Hi, there is no benefit to a stereo system : the BirdNET model is trained with 16bits 48khz mono files. Therefore, the code converts any input sound to mono before testing it. The only impact of a stereo input is in the recording sounds.

[poundy]

I bought the same ugreen device. If you configure the device in birdnet with 2x channels, you'll get no detections or recordings and your log fills up with errors telling you the hardware doesn't have that many channels. you can use arecord to test that as well, using -c1 versus -c2 for stereo you'll see the error.

I too built up a dual AOM-5024 unit. Guess on v2 I will only use one !