nx_denoise_spectral.nx

nx_denoise_spectral.nx -- sovereign SPECTRAL-SUBTRACTION denoise (the RNNoise-class direction: remove broadband noise DURING speech, not just between -- the gap vs Discord's Krisp). FFT the frame, attenuate frequency bins whose power sits below the noise floor (a fraction of the spectral peak), inverse-FFT back. Pure Nishi DSP (composes nx_fft); the browser only ferries raw PCM. Research: RNNoise (Valin, hybrid DSP+GRU band gains), DeepFilterNet. (This rung = the DSP spectral gate; the learned band-gain GRU is a later rung.) license_tier: ORIGINAL