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Definition of a lens

Lenses

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

What is in a lens?

Lens makers point to Connexions 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 Connexions member, a community, or a respected organization.

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

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  • Rice University ELEC 301 Projects

    This module is included inLens: Rice University ELEC 301 Project Lens
    By: Rice University ELEC 301As a part of collection:"ECE 301 Projects Fall 2003"

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

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Ideal Filters

Module by: Richard Baraniuk. E-mail the author

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Summary: Describes five ideal filters.

There are four fundamental filters. They are

  • Lowpass -- blocks high frequencies, allowing low frequencies through
  • Highpass -- blocks low frequencies, allowing high frequencies through
  • Bandpass -- blocks all frequencies except those within a certain range
  • Bandstop -- blocks only the frequencies within a certain range, allowing all others to pass through

Figure 1: Ideal frequency domain representations of the four fundamental filters.
(a) Lowpass(b) Highpass(c) Bandpass(d) Bandstop
Figure 1(a) (idealfilters1.png)Figure 1(b) (idealfilters2.png)Figure 1(c) (idealfilters3.png)Figure 1(d) (idealfilters4.png)

Another term one may come across in the study of filters is an "allpass" filter. This is one that allows all frequencies through. The only meaningful effect an allpass filter can have is on the phase of the signal.

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Rating system

Ratings

Ratings allow you to judge the quality of modules. If other users have ranked the module then its average rating is displayed below. Ratings are calculated on a scale from one star (Poor) to five stars (Excellent).

How to rate a module

Hover over the star that corresponds to the rating you wish to assign. Click on the star to add your rating. Your rating should be based on the quality of the content. You must have an account and be logged in to rate content.

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My Favorites (?)

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

| A lens (?)

Definition of a lens

Lenses

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

What is in a lens?

Lens makers point to Connexions 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 Connexions 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.

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