| 摘要 |
#CMT# #/CMT# The equipment (1) comprises a sound-capture panel (2) and an acoustic-emission panel (6), both oscillating in parallel and each respectively with primary (3n) and secondary (7i) induction coils connected between them in series. #CMT# : #/CMT# A primary (4n) and secondary (8i) system of permanent or electrical-induction magnets are linked respectively to the primary and secondary induction coils and fixed on a support (5). The orientation of the magnet polarities and the direction of winding of the coils are such that a current is generated in the primary coil from oscillations of the sound-capture panel, causing, via the secondary coil, the oscillations of equal frequency but opposite phase of the acoustic-emission panel. Superimposed acoustic waves are generated that cancel the acoustic waves with opposite phase correlating to the sounds and noise hitting the sound-capture panel. An amplification system (9), controlled by an electronic processor, is positioned between the primary and secondary induction coils. #CMT#USE : #/CMT# For the reduction of sounds and noise from road traffic close to housing and places of work. #CMT#ADVANTAGE : #/CMT# The equipment has an agreeable esthetic appearance and is of relatively limited size. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows the basic scheme of the electromagnetic system for the equipment. (1) Equipment#(2) Sound-capture panel#(3n) Primary induction coil#(4n) Primary magnet system#(5) Support#(6) Acoustic-emission panel#(7i) Secondary induction coil#(8i) Secondary magnet system#(9) Amplification system. |
