Digital Sound ProjectorsTM (DSP) enable the production of full physical surround-sound from a single equipment box. Working on the principles of phased-array antennas commonly used for electromagnetic waves, but adapted for the wide-bandwidth requirements of audio acoustics, DSPs simultaneously produce from one array of transducers, multiple independently steered and focused beams of sound each potentially carrying different audio program material. Utilizing the available reflective surfaces (e.g., ceiling and walls) in nearly all domestic listening environments, these distinct beams may each be arranged to reach the listeners from different directions. This paper discusses the theory, practice and evolution of DSPs with a minimum of mathematics.
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