Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1975-05-19
1977-04-26
Brown, Thomas W.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
179180, 181166, H04R 702
Patent
active
040202992
ABSTRACT:
An electro-acoustic transducer having a sound-generating diaphragm and means for driving the diaphragm in which the diaphragm is provided with perforations filled with damping material to oppose the formation of standing waves in the diaphragm. The perforations are arranged in between three and eight generally radially extending curved bands, each band being formed of a plurality of parallel rows of perforations extending along the length of the band.
REFERENCES:
patent: 982027 (1911-01-01), Young
patent: 1097499 (1914-05-01), Young
patent: 1560552 (1925-11-01), Esterbrook
patent: 1673661 (1928-06-01), Brigham
patent: 3093207 (1963-06-01), Bozak
Garner Alex Victor
Townsend Graham
Brown Thomas W.
The Rank Organisation Limited
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