Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1978-11-27
1980-02-19
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
179182R, 179187, 181151, 181160, 181175, 181196, H04R 128
Patent
active
041896270
ABSTRACT:
An electroacoustic transducer assembly adapted to filter sound waves in a digital communication system incorporates a plurality of tandemly arranged tubular members and a transducer. Each tubular member includes an apertured plate end, a tubular cavity and an open end. The open end of each tubular member is secured to the plate end of the adjacent tubular member to form a housing with a divided longitudinal passageway. The open end of the housing is secured to the transducer. Every tubular cavity is partitioned into longitudinal sections by structural elements to inhibit cross mode resonance. The apertures, cavity lengths and structural elements are dimensioned relative to the cavity cross sections to suppress passage of sound waves outside a predetermined frequency band.
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Bell Telephone Laboratories Incorporated
Cubert Jack S.
Stellar George G.
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