On 02/19/2012 07:33 PM, Renato wrote: > On Sun, 19 Feb 2012 17:53:37 +0000 > Fons Adriaensen <fons@xxxxxxxxxxxxxx> wrote: > >> On Sun, Feb 19, 2012 at 04:11:55PM +0100, Renato wrote: >> >>> I'd like to understand how the sensors work, but his site doesn't >>> seem to go much in depth on this... it says the sensors register >>> the sounds of the undercutaneous muscles. But are those even in the >>> audio frequency realm? And how would you capture them, with a piezo >>> contact mic? >> >> There was a paper on this at LAC 2011, see the proceedings. >> <http://lac.linuxaudio.org/2011/?page=download> >> > > again, thanks Fons. For the lazy, the actual sensor device is described > at page 160 (170 of the pdf) of the proceedings pdf [1]. It's basically > an electret condenser microphone, kept in place by a silicon case that > should also filter out external noise. So he's (knowingly) leaving out > part of the spectrum, since as he describes earlier in the article > muscle sounds are in the 4-45hz range and those mics go down to only > about 20. > > I must say I'm quite surprised to learn muscles make loud enough > sounds to be used this way... and this project of his looks freaking > cool IMO. Video of the presentation and direct link to the PDF: http://lac.linuxaudio.org/2011/video.php?id=17 http://lac.linuxaudio.org/2011/papers/30.pdf > renato > > [1] http://lac.linuxaudio.org/2011/download/lac2011_proceedings.pdf > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
