Zafar- > Are you about those signals overlap? Cos the
baby's heart beat is about 150 bpm,
> where as normal adults is about 70 bpm. Translated on to time scale the
baby's
> heart beat must occupy higher frequency band. Correct me if I am wrong.
Thanks
The heart rate is a fundamental frequency, but the waveforms are complex and
made up
of many frequency components. Secondary frequencies will overlap.
-Jeff
PS. Please post to the group, not me directly. > On 1/15/07, Jeff Brower
wrote:
>
> ZQ Taha-
>
> > I believe the 2 ECG signals of mother & baby occupy different band
> (have different frequency). You could perform FFT
> > on them filter them in frequency domain using band pass filter and
then
> perform IFFT to get back your time signals.
>
> That won't work; they will overlap in frequency. Linear predictive
and
> adaptive filter techniques would be more
> effective. See previous post by Humera Rafique Butt on this subject
(31
> Dec 2006), about "implementation of these
> filters and a good description of narrow band overlap problem is found
in
> Simon Hyken (Adaptive Filter Theory)."
>
> -Jeff
>
> > Hi;
> >>How can we filter 2 signals from eachother.
> >>for example,I have a signal which is the ECG of mother & also baby
> >>toghether,how can I seperate these two from eachother & also ,how
can
> >>I separate noise of city voltage?
> >>
> >>I will be very glad if someone answers me.
> >>
> >>thanks,
> >>maryam
>
Reply by Jeff Brower●January 15, 20072007-01-15
ZQ Taha-
> I believe the 2 ECG signals of mother & baby occupy
different band (have different frequency). You could perform FFT
> on them filter them in frequency domain using band pass filter and then
perform IFFT to get back your time signals.
That won't work; they will overlap in frequency. Linear predictive and
adaptive filter techniques would be more
effective. See previous post by Humera Rafique Butt on this subject (31 Dec
2006), about "implementation of these
filters and a good description of narrow band overlap problem is found in Simon
Hyken (Adaptive Filter Theory)."
-Jeff
> Hi;
>>How can we filter 2 signals from eachother.
>>for example,I have a signal which is the ECG of mother & also baby
>>toghether,how can I seperate these two from eachother & also ,how can
>>I separate noise of city voltage?
>>
>>I will be very glad if someone answers me.
>>
>>thanks,
>>maryam
Reply by zqta...@gmail.com●January 15, 20072007-01-15
I believe the 2 ECG signals of mother & baby occupy different band (have
different frequency). You could perform FFT on them filter them in frequency
domain using band pass filter and then perform IFFT to get back your time
signals.
I hope that helps.
Hi; >How can we filter 2 signals from eachother.
>for example,I have a signal which is the ECG of mother & also baby
>toghether,how can I seperate these two from eachother & also ,how can
>I separate noise of city voltage?
>
>I will be very glad if someone answers me.
>
>thanks,
>maryam
>
Reply by HUMERA RAFIQUE BUTT●December 31, 20062006-12-31
AOA MArium
This problem is known as spectral overlap problem. You need to apply some
adaptive filters for separating these signals. say LMS adaptive system. Matlab
documentation guides about the implementation of these filters and a good
description of narrow band overlap problem is found in Simon Hyken (Adaptive
Filter Theory).
Regards
HR
h
r
From: "Maryam Amoui" <maryam_1356@yahoo.com> To:
matlab@yahoogroups.com Subject: [matlab]
filtering? Date: Thu, 28 Dec 2006 17:16:07 -0000
Hi; How can we filter 2 signals from eachother. for example,I have a
signal which is the ECG of mother & also baby toghether,how can I
seperate these two from eachother & also ,how can I separate noise of
city voltage?
see help filter
----- Original Message ----
From: Maryam Amoui
To: m...
Sent: Thursday, December 28, 2006 12:16:07 PM
Subject: [matlab] filtering?
Hi;
How can we filter 2 signals from eachother.
for example,I have a signal which is the ECG of mother & also baby
toghether,how can I seperate these two from eachother & also ,how can
I separate noise of city voltage?
I will be very glad if someone answers me.
thanks,
maryam
Reply by Maryam Amoui●December 29, 20062006-12-29
Hi;
How can we filter 2 signals from eachother.
for example,I have a signal which is the ECG of mother & also baby
toghether,how can I seperate these two from eachother & also ,how can
I separate noise of city voltage?