I can hear the birds but Birdnet-Go does not; How to troubleshoot?

[geekworldtour]

Hello everyone
I am playing with Birdnet Go for the last 3 days (Raspberry Pi 3 + DIY mic).
I live in a city, so never really quiet, and not so many birds, but still 26 detections today between 4 and 8am.
I know I can improve my mic (USB extension cord, shielding on the cable)
But the issue I have is that I can hear birds outside, but Birdnet Go doesn't always show detections.
How can I test if it comes from the mic, from Birdnet Go not trying to analyse the data, or from anything else ?
Thanks a lot

[tphakala]

Can you share spectrogram images of your detections, that would show quality of your audio capture. But in mean time you can make detections more sensitive by reducing overlap value in Settings > Main > BirdNET settings, set it to 0 for example and see if it has any impact. Hoever this will increase number of false positives significantly, but could also increase number of correct detections.

[geekworldtour]

Thank you for taking time
Here is my set up
Audio settings

• Highpass filter, cutoff 1000Hz, Q factor 0.7, attenuation 12dB
• Lowpass filter, cutoff 10000Hz, Q factor 0.7, attenuation 12dB
• in Alsamixer, gain = 16 dBm

Birdnet settings

• Sensitivity 1
• Threshold 0.7
• Overlap 0

Here is the most quiet time

Here is the worst time of the day with nearby construction (many false positives but I don't care that much, the final location will be in the quiet contryside)

And here is an in-between.

[geekworldtour]

Quick improvement by soldering the shielding of the mic cable to the sleeve.
I also added a USB extension cord but the difference is not significant.
Before - After (1 night apart)