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Thank you for all the explanations. I have a littmann core stethoscope, it is actually quite successful, but it stores the recorded sounds on its own server, so I cannot create a dataset for signal

If the aim is to make a 'better' stethescope, could you tell us * what is?bad about present ones * annoying stuff * important stuff that could result in misdiagnosis If it's just a fun thing, I agree

I made several stethoscope mics. Just a Omni electret capsule glued into a stéthoscope. About 10Hz- >20000 kHz. You hear the same as with a stethoscope thus with body noises. No need to adjust the

That sounds like an interesting project.? I'm still amazed that doctors get so much information from such primitive passive technology, and wonder how much better they'd do with something better

Far be it for me to rain on your parade, but if you're interested in seeing what the state of the art is, I recommend a little excursion down patent lane. You'll easily find modern patents with noise

-- I am working on my own electronic sthethoscope design. Great project. If you were going to look at the waveform then you might need to go down to 1 Hz or lower. But if you are going to just listen,

Transducers used in body exploration require a certain amount of filtering and dynamic processing. Amplification in itself is generally not too difficult, but the frequency response must be tailoed to

Hi everyone, I am a cardiologist. For a fun activity, I am working on my own electronic sthethoscope design. Heart sounds are low frequency and low intense sounds. (About 20 to 1200 Hz). Are listened

Somewhat off topic… I'm not sure whether absolute polarity is audible. I’m willing to believe that a trained listener can hear it. I don’t think I can. I can tell when polarity is switched, but

I didn’t emphasize enough that if you are using stereo pair mic techniques, then polarity match matters. _______________________________________________ One technique for achieving "noise

have multiple mics out there wired with "+" to Pin 3. It works but the absolute phase is obviously reversed. Hmmmm.... ________________________________________ No problem, JR. Just hold it upside

I forgot to mention that the kick drum was recorded on tape, so there was no comparison with an acoustic source.

Indeed for live sound polarity matters very much - whether what comes out of the speakers is in the same acoustic polarity can make a big difference. -Scott

There have been a number of studies regarding teh audibility of phase and polarity. Regarding phase audibility, it's been shown that phase distorion could be heard when it changed significantly the

Goran: Appologies for using phase and polarity interchangeably. That is the way engineers I know carelessly use the terms. "So I would hazard to claim that the + sign should indicate to be connected

I would think the upper and lower heads of a snare drum would be? pretty good test but with the opposite expectation. The summed sound would be thicker if the two mics have opposite polarity.

On a two-terminal electret capsule, + means hot (ie: not ground), and is usually the drain of the included FET. And as you say, it's connected to a resistor from the positive bias voltage. From my

Jules Ryckebusch: What is + on a prepolarized condenser capsule ? Is it where the resistor going to the positive supply + should be connected ? Or is it the positive pressure applied to the diaphragm

I just checked my Pin 3 SimpleP48 against my U87 and more scientifically, looked at the waveform from an impulse. Both show that Pin 3 for the "+"of the capsule provides the signal swinging positive

I'm a little confused, myself... all the SP48 mics I've ever made have capsule + to XLR pin 3. A few years ago I went through all of my microphones (commercial and DIY), and all of my devices and