Sound focusing device

Details Sound focusing device Sound focusing device

1991-04-22

1992-09-08

Eldred, J. W.

Communications, electrical: acoustic wave systems and devices

Signal transducers

181186, 181143, 181175, 116137R, 116147, G10K 1100

Patent

active

051464349

ABSTRACT:
A sound focusing device for use with a siren. The device is comprised of an adjustable baffle or damper reducing the velocity of air or sound eminating from a siren. The baffle or damper is positioned internal to the siren. A conical sound focusing trumpet is positioned co-axially and external to the siren. The baffle or damper is made up of two complementary disks forming at least one defined opening therein. The baffle or damper is selectively adjustable.

REFERENCES:
patent: 1506393 (1924-08-01), Thomas
patent: 1941324 (1933-12-01), Schirmer
patent: 4138673 (1979-02-01), Faust
patent: 4847590 (1989-07-01), Gosswiller

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