Skip to content Skip to navigation Skip to collection information

Connexions

You are here: Home » Content » ELEC 301 Projects Fall 2007 » Conclusion

Navigation

Table of Contents

Lenses

What is a lens?

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

This content is ...

Affiliated with (What does "Affiliated with" mean?)

This content is either by members of the organizations listed or about topics related to the organizations listed. Click each link to see a list of all content affiliated with the organization.
  • Rice University ELEC 301 Projects display tagshide tags

    This collection is included inLens: Rice University ELEC 301 Project Lens
    By: Rice University ELEC 301

    Click the "Rice University ELEC 301 Projects" link to see all content affiliated with them.

    Click the tag icon tag icon to display tags associated with this content.

Also in these lenses

  • Lens for Engineering

    This collection is included inLens: Lens for Engineering
    By: Sidney Burrus

    Click the "Lens for Engineering" link to see all content selected in this lens.

Recently Viewed

This feature requires Javascript to be enabled.

Tags

(What is a tag?)

These tags come from the endorsement, affiliation, and other lenses that include this content.
 

Conclusion

Module by: Oleg Pesok. E-mail the author

Summary: 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.

Collection Navigation

Content actions

Download:

Collection as:

PDF | EPUB (?)

What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

Downloading to a reading device

For detailed instructions on how to download this content's EPUB to your specific device, click the "(?)" link.

| More downloads ...

Module as:

PDF | EPUB (?)

What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

Downloading to a reading device

For detailed instructions on how to download this content's EPUB to your specific device, click the "(?)" link.

| More downloads ...

Add:

Collection to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks

Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks