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This module contains a conclusion and summary of work done on a real-time laugh track removal system. It is part of a larger series discussing the implementation of this system.

Summary

We have looked at the various ways that a laugh track can be detected and how to implement a laugh track detection algorithm as a Directshow filter. The most effective way of detecting a laugh track appears to be looking at the waveform in the time domain instead of in the frequency domain. The algorithm to use for envelope detection can be changed and become increasingly more sophisticated as we attempt to catch and process correctly some of the more difficult cases.

Detection techniques

There are multiple ways to generate the envelope we use for detecting a laugh track. The simplest method is to square the signal and then low pass filter it, which gives quite good results. An even better algorithm involves using a Hilbert transform to generate the envelope, but this was too computationally expensive to implement in our Directshow filter.

We have also briefly discussed some of the ways to detect the envelope once we have generated a signal to pick out laughs from. On the simpler range of the spectrum, we can have a width and height thresholds for the laugh portion of the signal's envelope. On the other hand, we could also fit laugh tracks to polynomial curves and then use a Support Vector Machine to detect laugh tracks based on a database of positive and negative matches for laugh tracks.

In the end, we found that detecting and removing laugh tracks from an audio signal is much more complicated than it may appear on the surface. As a human, it is very easy to spot a laugh in the signal, but to create a system that can do this automatically is more complicated. Another interesting aspect of the system is how to remove the laugh tracks, which can be complicated because people often talk over the laugh tracks in our signals. To remove only the laugh track while leaving in the human voice signals is something that needs further exploration.

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Mueller Reply
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Source:  OpenStax, Elec 301 projects fall 2007. OpenStax CNX. Dec 22, 2007 Download for free at http://cnx.org/content/col10503/1.1
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