An improved method and apparatus is disclosed which uses probabilistic techniques to map an input search string with a prestored audio file, and recognize certain portions of a search string phonetically. The invention also relates to a hair coloring method that comprises applying on the fibers a composition containing one or more natural dyes for a duration sufficiently long for obtaining the desired color. The driving control device conducts to activate and to stop the electric motor by applying a PWM signal to the switching semiconductor elements constructing the lower arm of the H bridge circuit.