good day everyone.i just wanna ask something about the transmission of ecg signals. Ecg signals ranges from a very low frequency, therefore i want to use a frequency multiplier for this project. what frequency multiplier should i use so that the frequency will be be multiply up to the audio frequency for the ease of transmission.?thank you

 

You could record the signal to a WAV file for example then play it back at any rate you like.

 

Sound cards are most often AC coupled and they have frequency range from about 10 Hz and up. Take a look here for design ideas. http://openeeg.sourceforge.net/doc/hw/sceeg/
This is a EEG amplifier But still you may perhaps use the modulator approach

 

how about the frequency multiplier?

 

You may find that Audacity will work with you sound card to change the pitch of the EEG signals - http://audacity.sourceforge.net/

 

There is no such thing as a frequency multiplier chip for audio frequencies. It is a rather complicated process. I like the answers in post #2 and #4. There are ready made computer programs that can change the frequency, but they are computer programs, not a chip or two.

 

Would you be satisfied with using the low frequency ECG signal to frequency modulate an audio tone? This is along the lines of what beenthere has suggested.

hgmjr

 

You may find that Audacity will work with you sound card to change the pitch of the EEG signals - http://audacity.sourceforge.net/

What will that help as long as the soundcard blocks out lower frequencies. The bandwidth for an ECG amp should be 0.01Hz to 250Hz at least. I suggest the OP take a look at the MC1496 circuit used as AM modulator

 

your comments will be great help for me,thanks a lot