Lily:
I was hoping this was something RF related with wide differences in
frequencies and stable frequencies. This one doesn't sound very
doable.
Why are the two signals combined in the first place?
A hearbeat is a signal between 0 and about 250 beats a minute?
Respiration is a signal between 0 and about 50 breaths per minute?
It doesn't sound like it would be easy to separate these two signals.
You might try a high pass filter and a low pass filter to separate the
HB and respiration respectively but knowing where to place the roll
off points would be difficult especially since HB and respiration go
up and down with physical activity and vary from person to person.
You might be able to use an FFT or other spectral analysis tool to
determine where the HB frequency and respiration frequency lie but
there would be a lag probably of several seconds between determining
these and being able to use them as a filter for separating the two
signals. This wouldn't be very desirable with the tremendous
variability in heartbeat. Also I don't really know of a high pass or
low pass analog filter that goes this low although you may be able to
do this now with digital filters.
The best way to do this would be to go back and instrument for 2
totally separate signals, an ECG signal, and some sort of respiration
measurement sensor.
Doug De Clue
ddeclue@bellsouth.net
lilywyr@yahoo.com (Lily) wrote in message news:...
> ddeclue@bellsouth.net (Douglas De Clue) wrote in message news:<6f0395b7.0208051906.4f7e932b@posting.google.com>...
> > What kind of signal? It will be really hard to answer this question
> > unless you can give us the details of this project.
> >
> > Doug De Clue
> > ddeclue@bellsouth.net
> >
> > lilywyr@yahoo.com (Lily) wrote in message news:...
> > > Is there anyone who has example program that can seperate one signal from the other?
> > >
> > > Thanks,
> > >
> > > Lily
>
> For example, the ECG signal and the respiration signal.
