Fig. 3: Evaluation of time-frequency resolution on a known signal structure.
a Test signal containing 3 target packets with 11 cycles at 20, 40, and 60 Hz, each accompanied by a neighbor in frequency (+10 Hz) and a neighbor in time (+12 cycles). The signal sampling rate is 1024 samples/s. b Time-frequency power representation of the signal using STFT (Blackman window) and window size 38, 200, and 413 ms (roughly matching the size of a single wavelet with 3, 16, 33 cycles at the largest target frequency). c Same as in b but using Morlet wavelets with increasing number of cycles. d Same as b and c but using adaptive additive superlets with linearly varying order from: o = 1, for 10 Hz, to o = 30, for 80 Hz, and with different number of base cycles (c1 = 3, left; c1 = 5, middle), and o = 5 : 40, c1 = 1 (right). Power is given in arbitrary units (a.u).
