Variable frequency sound generator
OwnerMelvin A. Freundinventor
Life of this patent
Estimating the term…
Abstract
A low frequency sound generator is depicted in FIG. 1, having a resonator tube with an open end and a closed end, with a pulsing mechanism for admitting puffs of compressed gas into the closed end for purposes of producing sound waves out of the open end. The pulsing mechanism resides inside, and is movable along the axis of the resonator tube at the closed end, providing the means of closure for said resonator tube. The axial position of the pulsing mechanism is set through adjusting means, and determines the effective length of the resonator tube, thereby controlling the resonant frequency of the emitted sound.
Claims15
In a sound generator, having a resonator tube with an open end and a closed end, with a pulsing mechanism on the closed end admitting puffs of compressed gas into the closed end of the resonator tube for purposes of producing sound waves out of the open end of the tube, said sound generator being capable of producing sound at frequencies determined by the length of the resonator tube, said frequencies being the fundamental tone where the wavelength is equal to four times the effective length of the resonator tube, and all harmonics, said pulsing mechanism residing inside the resonator tube or an extension of the resonator tube at the closed end, being movable along the axis of the resonator tube to change the effective length of the resonator tube thereby changing the sound frequencies at which resonance is produced, and providing the means of closure for the resonator tube through sealing means provided between the pulsing mechanism and the resonator tube to establish the closed end boundary of the resonator tube.
A method of generating a sound field inside of an enclosure for the purpose of agitating gas molecules to create useful turbulence where:
- (a) one or more sound generators are installed around or within the enclosure for introducing sound into the enclosure;
- (b) pressure transducers are installed in various locations throughout the enclosure to provide active indication of the sound pressure levels in those locations;
- (c) a digital controller is used to control the sound generators to attain a resonating sound field within the enclosure.
Dependencies are inferred from the claim text.