Using Time Deformation to Filter Nonstationary Time Series with Multiple Time-Frequency Structures

Figure 5

(a) Data on transformed time axis; (b) the Wigner-Ville time-frequency distribution of (a); (c) data in (a) after low-pass filter; (d) data in (a) after high-pass filter.

(a) Data after time transformation

(b) Wigner-Ville plot for (a)

(c) Low-pass filtered data from (a)

(d) High pass filtered data from (a)