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Creating Directed Microphones from Undirected Microphones

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In this article we examine the possibility to create directed microphones from undirected microphones. The result is achieved only by using acoustical elements and is valid for all types of microphones, regardless of their way of work (electro-dynamical, condenser, optical, electro-mechanical etc.). By using alternations of the membrane usage, a force is obtained, which is equivalent to the effect of simultaneously operating undirected and bi-directed (eight) microphones. The result is a microphone with a space characteristic equivalent to the Pascal curve (i.e. directed microphone with the traditional shapes of the space characteristic - cardioid, super cardioid and hyper cardioid). The shape of the space characteristic curve is near to theoretical and does not depend on the acoustic elements of the microphone. The microphone is directed, but does not have a proximity effect.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=14047

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