<< Chapter < Page Chapter >> Page >
There are several signal transforms used in digital signal processing. Due to the non-stationary nature of the ECG signal, a transform that preserves the temporal occurrences of the signal’s frequencies is requisite for meaningful analysis.

Properties of the biorthogonal wavelet transform

Due to the non-stationary nature of the ECG signal, it is imperative to use a transform that preserves the temporal occurrences of the signal’s frequencies. The Fourier Transform, although commonly used in signal analysis, fails to do such, so it was necessary to select a transform with properties more suitable for this application. Properties of interest include orthogonality, wavelet function width, mother wavelet shape, and whether the wavelet function is complex or real valued. In ECG parameter extraction a non-orthogonal analysis involves high redundancy at larger scales. The width of the wavelet function, “directly acts on the analysis resolution that is for wavelet the result of balance between the length of analysis of samples window in time frequency axes. The shape of the mother wavelet is of interest as wavelet filtering can be viewed as an adapted filter looking for the highest correlation between the ECG signal to analyze and the considered wavelet. Lastly, “a complex wavelet providing information about both amplitude and phase is better suitable for oscillatory signal behavior whereas real valued wavelet function only returns a single signal modulus that can be used to isolate signal peaks and discontinuities. Further, “it is desirable that the basis functions (wavelets) be symmetric/antisymmetric. A symmetric basis will enable the detection of peak of wave as an extrema. In the case of antisymmetric basis, the peak of the wave is detected as a zero crossing. Second, minimizing the number of sign changes in the wavelet will facilitate the parameter extraction algorithm. In choosing between the various wavelet families, biorthogonal wavelets are a common choice for ECG signal analysis as they satisfy the above properties.

Questions & Answers

What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Elec 301 projects fall 2013. OpenStax CNX. Sep 14, 2014 Download for free at http://legacy.cnx.org/content/col11709/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Elec 301 projects fall 2013' conversation and receive update notifications?