Figure 6From: From wavelets to adaptive approximations: time-frequency parametrization of EEGCross-terms in time-frequency representations of signal's energy: (a + b)2 = a2 + b2 + 2ab. Wigner-De Ville transform (above) of a signal composed of two sine waves with compact and separated support (below). The structure appearing in the time coordinates where signal is flat (labelled "2ab") is a cross term.Back to article page