Fig. 3From: Algorithm to demodulate an electromyogram signal modulated by essential tremorExamples of two types of noise (f 1 = 5 [Hz], f 2 = 50 [Hz]). a Additive noise (sin2πf 1 t + sin2πf 2 t). b Multiplicative noise (sin2πf 1 t * sin2πf 2 t)Back to article page