A high efficiency loudspeaker without a damper is provided. A steering transducer is operatively connected between the steering ring and support post to convert mechanical rotation of the steering ring into non-mechanical steering control signals to be sent to a steer-by-wire system. When a portable station within the PHS operates as a voice recorder, a cost effective system in accordance with the present invention is adapted to compress and store received voicesound signals in order to increase the usage of limited memory resources provided within the portable station. The computer application program with the smallest priority value is automatically terminated.