Discussion: Denoiser made for plucked and metallic sounds

[elanhickler]

Hey Robin, we could make a great denoiser with the FFT tools.

1. Create a process to grab the noise profile by averaging the spectral energy over time for a given time range.
2. Detect vertical energy the in the spectrum (transients) and do not remove audio content around that area. Assume high frequencies decay almost instantly while lower frequencies take a second. User adjustable.
3. Remove all energy after the transient that is below noise floor. Anything above the noise floor are decaying harmonics and need to be preserved. Also, assume some area above and below these detections should also be preserved. User adjustable.
4. When a harmonic drops below noise floor, assume it continues on for a short period of time. User adjustable.
5. When a frequency bin suddenly appears and disappears above/below the noise floor, assume it is noise and do not preserve it, especially when it comes to higher frequencies.
6. When another transient is detected, reset/repeat. (or we can process one hit at a time)

image showing failure of denoiser to recognize that sudden appearances above noise floor should not be preserved: