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