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. 2016 Dec 14;11(12):e0168108. doi: 10.1371/journal.pone.0168108

Fig 2. The simulated nonlinear wave and its frequency modulation for the simple mathematic nonlinear model using a generalized intra-wave frequency modulation with ratio of modulating to carrier frequency η = 1.

Fig 2

(a) shows the simulated signals for strength of modulation δ = -0.3, 0, and 0.3; (b) shows the instantaneous frequency of the simulated signals.