DFT, 2 Sinusoids with Random noise.
Here a random contribution is added to the sum of 2 sines and the
DTFT and DFT calculated. As shown by the green and orange plots, the spectrum for 1 set of samples is far from flat.
Different sets of samples can be obtained by clicking on the
wL scrollbar. Different sample sets
are different in both the time and frequency domains.
The dark brown spectra shows the average of the spectra obtained
from different samples. The number of samples averaged can be increased by continuous clicking on the wL scrollbar.
After a large number of samples have been averaged, the spectrum
of the random component becomes 'flat' as would be expected for
the spectra of a random signal.
Return to main page
Return to page index
COPYRIGHT © 2007 Cuthbert Nyack.