INTERACTIVE SIGNAL DEMO - 2
You are seeing a representation of a continuous function (above) and its
Fourier transform (below). The function is a Gaussian pulse multiplied,
or "modulated," by a cosine of a particular frequency. This demonstration
allows you to change the modulation frequency, as well as the amplitude of
the function, and immediately observe those changes in both domains.
Click and drag a point on the waveform displayed in either plot
to move that point to a new location, thereby setting a new modulation
frequency and amplitude.
The modulation frequency of the waveform is specified in the editable
text box beneath the plots. This number is updated when you click and
drag either waveform. You can also change the modulation frequency by
clicking in the text box and editing the number there, and then pressing
the RETURNKS5UQA key or moving the pointer outside of the box. The sliding
control above the text box monitors changes in the modulation
frequency. By clicking and dragging the control you can set the