Fourier series

 

Play interactively with different waveforms, apply Fourier filters,

listen to them

 

http://www.falstad.com/dfilter

 

 

 

Convolution

 

Play interactively with convolution using functions that you can create yourself using the mouse.

 

http://www.jhu.edu/signals/convolve

  

 

The joy of convolution

 

Play interactively with convolution using different functions

 

http://www.jhu.edu/signals/convolve
 

 

 

Fourier Transform and Diffraction

 

Watch the behaviour of diffraction patterns using slits with varying sizes,

using light with different wavelengths

 
http://cnyack.homestead.com/files/afourtr/ftdiffraction.htm

 

 

Fourier Transform Experimentation

 

Play with Fourier transforms on 2-D images, where you may use your own

images; apply various filters in the Fourier domain and see the results

in the image domain

 

http://homepages.inf.ed.ac.uk/rbf/HIPR2/fftdemo.htm

 

Interactive Fourier Transform

 

Use gif images and play with the FFT. Filter them in various ways.

 

http://homepages.inf.ed.ac.uk/rbf/HIPR2/fftdemo.htm

 

Antenna applet

 

Watch the reception pattern of a linear array with a varying number of

elements, element separation, and phase shift

 

http://www.ee.siue.edu/~jchen/ee340/antenna_array.html

 

 

 

Virtual Radio Interferometer

 

Play interactively with various interferometers that actually exist.

Use different sources and (u,v)-coverages to see the effect of such

incomplete apertures on the resulting images.

 

http://www.narrabri.atnf.csiro.au/astronomy/vri.html