| 摘要 |
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.
|
