Abstract
Analytical models of a wave interference directional microphone were developed for use on a digital computer. Many microphone design parameters were analyzed in detail, Wave interference directional microphones consist of cylindrical tubes with sound pressure receiving ports spaced along their length. Electroacoustical transducers are placed near one end. Both ends are terminated by acoustical impedance elements. The microphone is classified as an end-fire receiving array for air use. Variations of this type of microphone have existed for many years; however, a detailed analytical model was never developed and verified. The microphone was modeled using acoustical transmission line theory. Various microphone configurations were evaluated for frequency response and directivity. The most important effects on performance, tests proved, are caused by internal sound wave propagation, and these effects can alter performance drastically from that predicted by geometric line array theory. The models were verified by comparison of measured and predicted frequency response and directivity of actual microphones. Many design parameters of the directional microphone were analyzed, utilizing the theoretical models. This information will be presented.
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