Acoustic apparatus

Details Acoustic apparatus Acoustic apparatus

1989-03-15

1991-05-07

Fuller, Benjamin R.

Acoustics

Diaphragm

With resonant chamber

181153, 181156, 181199, 381 96, 381159, G10K 1104

Patent

active

050128906

ABSTRACT:
In an acoustic apparatus in which a vibrator is arranged in a Helmholtz's resonator having an open duct port, and the vibrator is driven to radiate a resonant acoustic wave, a duct resonance absorbing means is provided to the open duct port constituting the Helmholtz's resonator so as to remove an unnecessary resonant sound other than a Helmholz's resonant sound caused when the Helmholtz's resonator is driven, thereby removing noise in a radiated acoustic wave and improving distortion characteristics.

REFERENCES:
patent: 3821473 (1974-06-01), Mullins
patent: 4126204 (1978-11-01), Ogi et al.
patent: 4135600 (1979-01-01), Ogi et al.
patent: 4180706 (1979-12-01), Bakgaard
patent: 4741040 (1988-04-01), Kaizer

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