Abstract
An acoustically realistic method of tone radiation was needed in order to complement a unique Baldwin optoelectronic system for the retrieval of photographically stored, computer-generated facsimiles of pipe organ tones. A study of the radiation patterns of tubular sources and arrays led to the invention of “electro-acoustic pipes” for the purpose. Each pipe is a vertical tubular enclosure for a loudspeaker located at and radiating chiefly from the upper end of the tube. Conically tapered absorption within the lower end and internal absorptive rings prevent either the axial or the transverse modes of the tube from coloring the tone spectrum. A port near the conventional pipe-mouth location resonates with the enclosure to enhance low-frequency tone radiation. Various sizes and lengths can be used in arrays resembling conventional organ pipes acoustically, and even visually if desired.
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