A probability distribution for speech model parameters, such as auto-regression parameters, is used to identify a distribution of denoised values from a noisy signal. A formula for effective capacitance is derived which considers the effect of slew as well as resistive shielding of capacitance, thus yielding more accurate delays for both the interconnects and the source driver. The first time as compared to a threshold time. A suitable viscosity of liquid in the nozzle is recovered from an increased viscosity thereof by operating a recovering unit.