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The microphone method you suggest might not work (though I have not tried it) as microphones are manufactured for audible range of frequencies 20Hz to 20KHz and your working frequency would be near about 2-4 Hz.
Im not sure, but I think the heart beats at 2-4 Hz, while the sound generated from it, is completely hearable via ear, thus making it hearable to microphone too!The microphone method you suggest might not work (though I have not tried it) as microphones are manufactured for audible range of frequencies 20Hz to 20KHz and your working frequency would be near about 2-4 Hz
if I were you, I would graph the signal amplitude, then decide on cut off or even filter type.should i take exactly 2Hz as the cut off frequency?
ama_trig said:Im not sure, but I think the heart beats at 2-4 Hz, while the sound generated from it, is completely hearable via ear, thus making it hearable to microphone too!
record the sound via microphone, decide it your self, even it is so simple to check the recorded signal for measuring the heartbeat
thanks for thisrecord the sound via microphone, decide it your self, even it is so simple to check the recorded signal for measuring the heartbeat
if I were you, I would graph the signal amplitude, then decide on cut off or even filter type.
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