Subminiature directional microphones having physical volumes of approximately 0.12 cm(3) and masses of 0.3 gram have been designed using both ceramic and electret condenser transducing systems. Computer simulated original design data are compared with experimental data and show the way to predict the range of performance that can be achieved with emphasis on special types for hearing aids.
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https://aes2.org/publications/elibrary-page/?id=1686
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