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Re: [AUDITORY] Ear Probe Mics and detecting the heartbea t?



ï
You are wrong. Pressure microphones have so called barometric hole (on diaphragm or housing), limiting lowest frequency.
 
----- Original Message -----
Sent: Sunday, June 30, 2013 12:54 PM
Subject: Re: Ear Probe Mics and detecting the heartbea t?

May be the limiting factor is your amplifier response at low frequencies, but not the mic.  Conventional one port small inner volume condenser microphone works quite well starting from about 0 Hz.


ÐÑÑÐÐÑÐ, 28 ÐÑÐÑ 2013, 10:36 UTC ÐÑ "Jelfs, Sam" <sam.jelfs@xxxxxxxxxxx>:

Dear List,

 

Just a question for those of you with experience using ear probe microphones, do you ever hear the heartbeat? Iâve built a couple of in-ear microphones, and can hear my own heartbeat, but the quality is relatively poor, and only works in very low-noise conditions. I was looking in to using dedicated probe mics, such as Etymotic ER-7C (http://www.etymotic.com/pro/er7c-ts.aspx) and whether that might give me a better signal-to-noise ratio, but just wondered if anyone has any experience of this before I buy some.

 

Thanks

 

Sam Jelfs

 

--------------------------------------------------

 

Sam Jelfs

Research Scientist

Philips Research Laboratories, Eindhoven

Smart Sensing & Analysis

 

Address : High Tech Campus 36

5656 AE  Eindhoven

The Netherlands

Tel: +31 (0)40 27 42402

e-Mail: sam.jelfs@xxxxxxxxxxx

 



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alex kalinin