Fig.6.
Comparison of IMAAC results for signals with spurious and true AACs. (A, B) IMFs and(C, D) AACC of (A) a sawtooth wave (10 Hz) without AAC and (B) a synthetic signal with AAC between two sinusoids (10 Hz and 40 Hz). In both signals, the amplitudes of oscillations are modulated by the same arbitrary nonstationary amplitude.