linuxaudio.org

On 02/19/2012 07:33 PM, Renato wrote:

quoted text
> On Sun, 19 Feb 2012 17:53:37 +0000

> Fons Adriaensen  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.

>>

>>

>

> 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

quoted text
>

> [1] http://lac.linuxaudio.org/2011/download/lac2011_proceedings.pdf

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