A voltage level shifter and a semiconductor device having the same are presented. When more than two microphones are used, the traditional time-delay-of-arrival based sound source localization approach involves two steps. The motor further contains a plurality of arms in the cross-like or star-like monolithic body forming the spools of a stator. The circuit further comprises a error estimation module, coupled to the remnant frequency compensation module, for generating an error estimate according to the third signal and its hard decision estimate, and the error estimate is further fed back to the equalizer to refine the channel impulse response estimate. This audio information is accessible to mobile users using cellular phones, or other transceivers, and by fixed users using phones or computers.