<< Chapter < Page Chapter >> Page >
Final conclusion drawn from our results.


Final thoughts

Our work has shown how important it is to have the right model for the right situation. The fact that the use of convolutive rather than a multiplicative mixing matrix led to success attests to the importance of proper modeling. This was clearly demonstrated by the results of our testing. The Fast ICA model is appropriate for the ideal case of mixing signals in Matlab because all the necessary fast ICA assumptions are met. In particular, the mixing matrix is multiplicative. However, for the case or acoustically mixing signals by recording two sources simutaneously, we saw that fast ICA failed competely to isolate individual sources because a convolutive mixing matrix is involved instead of a multiplicative one. It should be noted that there are a least two stages in which convolution occurs: both in the room and in the air on the way to the microphone, and as the microphone transduces the signal to an electric signal. These processes may be grouped into a single mixing matrix without loss of information because of the transitive property of convolution and because we are not exclusively interested in what the signal of the microphone was, but rather in what the original source sounded like. Using the STFICA algorithm, we were able to at least successfully separate the sources for the tone and noise case, therefore proving that the STFICA model is suited for this secnario. However, we were not successful in more complicated cases such as voice and tone due to the fact that our group did not have enough time to fully undertand and implement the concept of variable stages of prewhtening. So there is potential for the STFICA model to be fully applicable to all acoustically mixed sources, but further modifcations as well as a better understand of the model is needed. Another testament to the importance of choosing the correct model for a particular application, is that while it is true that fast ICA failed with acoustically mixed signals, fast ICA works exceptionally well with image applications such as visual noise removal.

Steps toward improvement

Since our team did not yet achieve exceptional separation of more complicated acoustic signals, such as the voice and tone case, there are some steps to take to improve our results. For example, there must be a refinement of the prewhitening process, which requires additional study on the part of our group members. With this better understanding of the prewhitening concept and process, we expect to gain a better comprehension of the number of required prewhitening stages to make the given mixed signals become more independent of one another in time and space. This should in effect significantly help in the demixing of any complicated mixed signals to its individual sources with as much success as with the tone and noise case. Another method for improvement includes the use of expected behavior in order to better isolate the signal sources. For exmaple, if we know that a man and a woman are speaking, we should be able to tell our algorithm some additional information about the expected spectra of our speakers.

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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 did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
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 2008. OpenStax CNX. Jan 22, 2009 Download for free at http://cnx.org/content/col10633/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Elec 301 projects fall 2008' conversation and receive update notifications?