The quality of sound pickup in large rooms—such as auditoriums, conference rooms, or classrooms—is impaired by reverberation and interfering noise sources. These degradations can be minimized by a transducer system that discriminates against sound arrivals from all directions except that of the desired source. A two-dimensional array of microphones can be electronically beam-steered to accomplish this directivity. This report gives the theory, design, and implementation of a microprocessor system for automatically steering a two-dimensional microphone array. The signal-seeking transducer system is implemented as a dual-beam ‘‘track-while-scan’’ array. It utilizes signal properties to distinguish between desired speech sources and interfering noise.