currently a homebrew pickup\piezo pickup microphone seems the best bet.
currently a homebrew pickup\piezo pickup microphone seems the best bet.
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[[https://www.aliexpress.com/wholesale?catId=63705&initiative_id=AS_20190106125155&SearchText=bone+conduction|AliExpress sellers]] of bone conduction headphones/microphnes bluetooth headsets
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[[https://www.aliexpress.com/wholesale?catId=63705&initiative_id=AS_20190106125155&SearchText=bone+conduction|AliExpress sellers]] of bone conduction headphones/microphones bluetooth headsets might also be interesting to test.
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the [[https://research.miyashita.com/papers/I35|"unlimited gum"]] piezo based prototype offers some interesting quotes