Acoustic apparatus

Details Acoustic apparatus Acoustic apparatus

1989-08-04

1991-01-22

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

181156, H05K 500

Patent

active

049876015

ABSTRACT:
An acoustic apparatus has a Helmholtz resonator having an open duct port and cavity and a vibrator disposed in the Helmholtz resonator. An opening portion of the open duct port is extended in a horn-like shape, so that the open duct port communicates with a port mounting surface with a smooth curvature. An air-flow diffusing body corresponding to the shape of the port opening portion is provided at the center of the extended port opening portion, so that an effective sectional area of the air-flow path defined by the opening portion and the diffusing body is substantially equal to a sectional area of the open duct port excluding the opening portion.

REFERENCES:
patent: 4135600 (1979-01-01), Ogi et al.
patent: 4213515 (1980-07-01), Laupman
patent: 4276443 (1981-06-01), Meyers

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