Phase plug with optimum aperture shapes

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure

Reexamination Certificate

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Details

C381S337000, C381S339000, C381S340000, C181S177000, C181S185000, C181S187000, C181S189000, C181S192000

Reexamination Certificate

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07095868

ABSTRACT:
A phase plug for optimally matching a drive-unit's diaphragm to the throat of a waveguide is disclosed. Specific embodiments of a circular diaphragm matched to an elliptical waveguide and a circular diaphragm to a rectangular waveguide are disclosed.

REFERENCES:
patent: 2037187 (1936-04-01), Weate
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patent: 4050541 (1977-09-01), Henricksen
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patent: 4718517 (1988-01-01), Carlson
patent: 4975965 (1990-12-01), Adamson
patent: 5117462 (1992-05-01), Bie
patent: 6026928 (2000-02-01), Maharaj
patent: 6064745 (2000-05-01), Avera
patent: 6628796 (2003-09-01), Adamson
patent: 6744899 (2004-06-01), Grunberg
patent: 2002/0021815 (2002-02-01), Button et al.
Earl Geddes, Audio Transducers (Book) Jul. 2002, pp. 126-164, Gedlee Publishing www.Gedlee.com.

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