ACTIVE ACOUSTIC IMPEDANCE MODIFICATION ARRANGEMENT FOR CONTROLLING SOUND INTERACTION
Assignee
UNITED STATES OF AMERICA, THE, AS REPRESENTED BY, THE SECRETARY OF THE NAVY
Filed
Jul 1, 1991
Granted
Sep 19, 1995
Location
UPPER MARLBORO MD US
Abstract
An active impedance modification device or arrangement enables the interaction of sound with a structural surface to be controlled, e.g., so that, reflections from that surface (which can be the hull of a submarine) are substantially reduced or eliminated. The device comprises a coating comprising an inner driver transducer layer in contact with the structural surface an outer receiver transducer layer which receives the sound, in combination with a variable gain, variable phase shift amplifier connected between the interface of the outer layer with the sound carrying medium (e.g., water) and the interface between the second layer and the structural surface. Reflections are reduced by setting the gain and phase shift of the amplifier to simulate the input impedance of the sound carrying medium.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Oct 30, 1991
Rescinded
Feb 24, 1995
Duration
3 years, 3 months
Inventor
- 1ROBERT D. CORSARO
Record Details
- Patent number
- US 5452265
- Application
- 07733415
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records