Biomedical Engineering Reference
In-Depth Information
FIGURE 2.13:
Illustration of cross-terms in WVD. a) Linear chirp—its time-
frequency representation is a straight line, b) two Gabor functions—note the cross-
term structure in the time-frequency representation just in the middle of the line
connecting the representations of the individual components. c) A real world exam-
ple: 10 sec. of EEG recorded during sleep stage 2, with a clear sleep spindle visible
as a transient oscillatory structure.
(
,
)
(
,
)=
and
f
1.
Another very popular member of the class is the Choi-Williams distribution with the
ξ
τ
is the filter kernel. WVD is a member of Cohen's class with
f
ξ
τ
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