Spectrogram example #1

Example #1: sum of sinusoids

Analog waveform
[Graphics:../Images/index_gr_38.gif]

[Graphics:../Images/index_gr_39.gif]

[Graphics:../Images/index_gr_40.gif]
Fast Fourier Transform (FFT)
[Graphics:../Images/index_gr_41.gif]
[Graphics:../Images/index_gr_42.gif]
[Graphics:../Images/index_gr_43.gif]
[Graphics:../Images/index_gr_44.gif]
[Graphics:../Images/index_gr_45.gif]

[Graphics:../Images/index_gr_46.gif]

Example #2: time-varying sinusoid

Analog waveform
[Graphics:../Images/index_gr_47.gif]

[Graphics:../Images/index_gr_48.gif]

[Graphics:../Images/index_gr_49.gif]
Fast Fourier Transform (FFT)
[Graphics:../Images/index_gr_50.gif]
[Graphics:../Images/index_gr_51.gif]
[Graphics:../Images/index_gr_52.gif]
[Graphics:../Images/index_gr_53.gif]
[Graphics:../Images/index_gr_54.gif]

[Graphics:../Images/index_gr_55.gif]


Converted by Mathematica      March 25, 2003