DFT, 3 Sines, Short Time Fourier Transform.

Cuthbert Nyack
This applet shows one way of analysing a signal whose frequency changes with time. In this case, the signal is of 10s duration and changes from w1 to (w1 + w2)/2 to w2.
The 10s duration is divided into 5 2s sections and the spectrum found for each section. The result is illustrated below.



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COPYRIGHT 2007 Cuthbert Nyack.