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US 5,350,887 AGranted
Method and apparatus for the generation of low frequency sound
AssigneeInfrasonik AB
InventorRoland Sandstrom
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AssigneeInfrasonik AB
InventorRoland Sandstrom
Estimating the term…
The invention relates to a method and apparatus for the generation of low frequency sound by means of the excitation of a low frequency standing gas borne sound wave. A low frequency sound generator comprises a resonator part and a feeder part with a feeder unit. The method consists of a controlled generation of periodic changes of the gas volume of the resonator part in order to create a standing sound wave. The invention also includes a feeder unit for the working of the method. The feeder unit comprised of three rotating parts, namely one center rotor and two side rotors, the rotation of which are synchronized. The feeder unit is open on two sides, each side communicating with one tubular resonator. The rotors are provided with cut out portions and the center rotor is also provided with a protruding vane-shaped part. It is the rotation of the rotors in combination with their special shapes that generate periodic changes of the gas volume in the resonators without any internal compression in the feeder unit.
Feeder unit for a low frequency sound generator, said low frequency sound generator comprising a feeder part including said feeder unit and a resonator part for the excitation of a low frequency, standing, gas borne sound wave inside the resonator part, said feeder unit being provided with means for controlled generation of periodic changes of the gas volume inside the resonator part, said means comprising a plurality of rotating rotors located in a casing and wherein the rotation of said rotors in combination with their geometric designs work to achieve volume changes in the gas inside the resonator part.
Dependencies are inferred from the claim text.