The human ear. From what I can hear, most of what's being done is selective filtering. Leaving behind some artifacts and much less fidelity. Similar feats by h

The human ear. From what I can hear, most of what's being done is selective filtering. Leaving behind some artifacts and much less fidelity. Similar feats by human engineers have been around for decades. Analog filters/Fourier can be used to put frequency segments into channels (e.g. vocoding), then keeping the useful channels.