That's clever but that's so many dB down with any sane anti-aliasing filter that it would require quite the sound source. Based on flipping through the pages o

That's clever but that's so many dB down with any sane anti-aliasing filter that it would require quite the sound source. Based on flipping through the pages of the paper (https://arxiv.org/pdf/1708.09537.pdf https://arxiv.org/pdf/1708.09537.pdf), it looks like they're taking advantage of the non-linearity in the response at high frequencies to effectively demodulate a lower-frequency signal that was mixed up to ~22 KHz. Which, if that's what they're doing, is totally awesome!