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Third-Order Gradient Microphone for Speech Reception

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The design and performance characteristics of a third-order gradient microphone are described. Its exceptional mid-band audio directivity is compared to theoretically derived response characteristics. The system employs four capacitive transducers coupled to low-noise RF bridge circuitry. Portable control electronics allows selection of both unidirectional and bidirectional response in the second- and third-order mode.

JAES Volume 18 Issue 6 pp. 636-640; December 1970
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AES - Audio Engineering Society