search

xiph / rnnoise

Recurrent neural network for audio noise reduction
BSD 3-Clause "New" or "Revised" License
3.89k stars 882 forks source link

Why is a biquad filter needed before denoise? #224

Closed segu-L closed 2 months ago

segu-L commented 2 months ago

What does a biquad filter do, and how are the coefficients designed?

jmvalin commented 2 months ago

It's a high-pass filter that removes the frequencies below ~50 Hz that can only be noise (below the pitch fundamental).