  We have investigated the combined effects of a multiplicative noise and
nonlinear conductivity on the charge density wave (CDW) dynamics of the
quasi-one dimensional conductor Rb0.30MoO3. When the amplitude of a bipolar
rectangular voltage pulse excitation is modulated by a multiplicative Gaussian
white noise perturbation, the average pulse amplitude is smaller than the
unperturbed one and shows a non monotonous behaviour when the pulse amplitude
is increased. We analyze the transient response in terms of an increase of
phase coherence of the charge-density-wave.
