Feature Request: Add Noise Reduction / Audio Filtering Options

[zemzema]

First of all, thank you for the amazing work.

I would like to submit a feature request: it would be extremely helpful to have built-in options in the settings for noise reduction and audio filtering.

A few suggestions for implementation:
High-pass and low-pass filters to remove unwanted frequency ranges.
Adaptive noise reduction (similar to afftdn in FFmpeg or other DSP filters).
Optional toggle in the web interface to enable/disable filtering per microphone or input device.

This feature would improve detection accuracy and usability for a wide range of users without requiring manual scripts or advanced technical setup.

[alexbelgium]

Hi, those options exist in the viewer (after birdnet analysis) but not prior analysis. There is lots of debate on the usefulness and whether it bias the model, and I don't remember a clear demonstration that it was working. I myself tested it for a while. Given the model was trained with sounds with noise, perhaps it explains why it could be more resilient to noise

[stevedee]

Note that BirdNet already reduces the bandwidth to 150Hz - 15kHz during analysis.

For best results, incoming audio should probably be from a single source, 16bit resolution, 48kHz sample rate.