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by virgil_disgr4ce 3213 days ago
This was my question. Seems bizarre to not bandpass everything as the first stage!
1 comments
TeMPOraL 3213 days ago
From skimming the paper it seems they're making the signal demodulate itself directly on the microphone - by the time it hits a low-pass filter and ADC, the audible frequencies are already injected.
link