Patent ID: 7011178

Claim:
A sound emitter comprising: at least one vibrating diaphragm mounted in the wall of an enclosure ( 2 ) so that one face of the diaphragm radiates into the enclosure ( 2 ), the enclosure ( 2 ) being provided with a vent ( 3 ; 13 ; 23 ) forming a duct ( 5 ; 15 ) between an opening ( 4 ; 14 ) inside the enclosure and an opening ( 6 ; 16 ) outside the enclosure, wherein at least one of the openings ( 4 ; 14 , 6 ; 16 ) is flared in shape towards its end, said flared opening ( 4 ; 14 , 6 ; 16 ) having an end portion presenting a profile of concave section with its concave side facing towards the inside of the opening.