Microphone in a cylindrical housing having elliptical end faces

Details Microphone in a cylindrical housing having elliptical end faces Microphone in a cylindrical housing having elliptical end faces

2003-10-30

2008-10-07

Ensey, Brian (Department: 2615)

Electrical audio signal processing systems and devices

Hearing aids, electrical

Directional

C381S356000

Reexamination Certificate

active

07433482

ABSTRACT:
The device is now a squarely-truncated horizontal cylinder capped at each end by a circular disc central to which is placed a transducer. With amplification the device yields the sound spectrum which can be heard in consciousness. The cylinder is extended just sufficiently to accommodate truncation at 35 degrees 16 minutes yielding a chiral pair of elliptical openings which, with amplification, add cues to sound-source localization and range determination which are not heard but are known subconsciously. The long axes of the elliptical openings are set orthogonally at 45 degrees to the horizon, thus allowing correct spatial orientation. Elliptical caps, with open edges, are applied to the elliptical ends of the device hiding the transducers from view and from direct sound. To cancel internally generated resonances the enclosed spaces are filled with fine irregularly-shaped particulate matter.

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patent: 2323437 (1974-11-01), None
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patent: 2004439 (1979-03-01), None

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