초록

.lambda./4-absorber with an adjustable band width comprising at least one .lambda./4-resonator (2) whose opening region (4) comprises a perforated head part (5). A further development of this .lambda./4-absorber is provided with a soft and/or heat exchanging material (7) in the floor region (3).

대표청구항 ▼

[ I claim:] [1.] A .lambda./4-absorber for the absorption of sound, such as is generated by machines, in particular by vehicles, comprising:a plurality of tubular .lambda./4-resonators wherein each .lambda./4-resonator has an opening region having a plurality of spaced apart openings which border on

[ I claim:] [1.] A .lambda./4-absorber for the absorption of sound, such as is generated by machines, in particular by vehicles, comprising:a plurality of tubular .lambda./4-resonators wherein each .lambda./4-resonator has an opening region having a plurality of spaced apart openings which border on a sound reflecting surface;a plurality of interaction zones corresponding to each of said plurality of spaced apart openings, wherein an impinging sound wave destructively interferes with a standing sound wave formed in said .lambda./4-resonator, and wherein said plurality of interaction zones are distributed to cover a sound reflecting surface and each of said plurality of interaction zones does not significantly overlap another of said plurality of interaction zones;wherein a band width of a resonant frequency response of said .lambda./4-resonators can be adjusted by a first means for changing a sound energy loss in said opening region, said first means having a low air flow resistance approximately equivalent to that of a wide-meshed grid.