First this may have been answered someplace else or there may be a thread elsewhere that could help...but I didn't find it.My wife is an RN. Many of the younger (actually, student) nurses have stethoscopes that have a "back ground noise eliminator". Some are mechanical (don't ask me how, but they physically invert the phase of the background noise and add it to the palpitated heart/breath sounds), while others are active (electronic ).
I've been thinking about modifying a typical stethoscope, using a microphone capsule feeding a headphone amp and feeding the reverse phase output to a pair of modified IEMs (cheepies I all ready have.). The IEMs would be attached to a pair of modified earpieces. The idea here is to isolate the heart/breath sounds from the environmental noise and to allow for some fine tuning.
Is there any reason this might not work?
any ideas would be appreciated., thanks
posted 02-11-2009 05:50 PM CST (US) 
