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https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/s12938-018-0540-2
Not until you'd linked it, but as with many of the steth's produced- the focus is heavy on cardiology exam- which though I love to do- only represents 1/3 ish of what I use mine for.
The OG paper by Littman suggests I should be looking at 60-1k Hz, and I guess the optimal outcome would be to produce a filter that isolated sounds either side of that frequency range.
Then it would go Bell/Diaprhagm-tubing-mic-filter-output.
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@danb
Have you seen this paper?
https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/s12938-018-0540-2