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This section describes how the signal is extracted.

V – signal extraction

Prior to signal comparison, the signals must first be aligned. The first step to alignment is to extract the relevant signal from the entire data segment. To perform this initial processing we smooth the absolute value of the data, and find the maximum of the smoothed data. Given the index of the maximum, we extend the bounds of our hypothesized signal outwards until the amount of energy within our bounds exceeds a threshold percentage. Energy is defined as the L2 norm of the data signal, shown in (5.1). This procedure is encapsulated in the function “extractSignal”.

E = i data ( i ) 2 size 12{E= Sum cSub { size 8{i} } {"data" \( i \) rSup { size 8{2} } } } {} (5.1)

The threshold percentage was determined empirically. Figure 5.1 shows examples of the signal that was extracted for different threshold percentages. Portions of the data that were edited out are replaced with 0. As one can see, thresholding at 90% removes relevant information from the data, and thresholding at 99% retains much of the irrelevant values in the data. We set the energy threshold to 95%.

Figure 5.1: Results of identifying the signal in the data segment based on different energy percentage thresholds. The original data shown is of Nicholas stating the word “one”. Portions that are removed from the signal are set to 0.

Questions & Answers

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 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.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Analysis of speech signal spectrums using the l2 norm. OpenStax CNX. Dec 12, 2009 Download for free at http://cnx.org/content/col11143/1.2
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