From the developer of RNNoise, which is the technique being used here: "As strange as it may sound, you should not be expecting an increase in intelligibility.

From the developer of RNNoise, which is the technique being used here: "As strange as it may sound, you should not be expecting an increase in intelligibility. Humans are so good at understanding speech in noise that an enhancement algorithm — especially one that isn't allowed to look ahead of the speech it's denoising — can only destroy information. So why are we doing this in the first place? For quality. The enhanced speech is much less annoying to listen to and likely causes less listener fatigue" https://jmvalin.ca/demo/rnnoise/ https://jmvalin.ca/demo/rnnoise/