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US 6,665,413 B1Granted
Infrasonic Helmholtz resonator
AssigneeThe United States of America as represented by the Secretary of the Army
InventorJohn K. Domen
Life of this patent
Estimating the term…
Abstract
An infrasonic Helmholtz resonator capable of producing clean sinusoidal frequencies in the range of 6-14 Hz is described.
Claims12
An infrasonic sound power generator for producing clean sinusoidal signals in an audible range of 6 to 20 Hz, comprising:
- a container;
- at least one vibrator disposed within the container;
- an internal baffle disposed within the container;
- a first vent and a second vent secured to the container and extending outside the container;
- the first vent having a variable length and being tunable to a desired frequency by adding an extension;
- at least one of the first vent or the second vent being closed by a cap;
- and
- wherein air inside the container resonates at a Helmholtz frequency in accordance with the following equation:
- Hz (Helmholtz frequency)=C*[SQRT(S/((L+X)*V))]/(2*pi),
- where C represents the speed of sound, S represents a vent area, L represents a vent length, R represents a vent radius, X represents 1.5*R, and V represents a container volume.
7 more elements
A speaker system for producing infrasonic sound in a range of 6 to 20Hz, comprising:
- a container;
- at least one vibrator disposed within the container;
- an internal baffle disposed within the container;
- a first vent and a second vent secured to the container and extending outside the container;
- the first vent having a variable length and being tunable to a desired frequency by adding an extension;
- at least one of the first vent or the second vent being closed by a cap;
- and
- wherein air inside the container resonates at a Helmholtz frequency in accordance with the following equation:
- Hz(Helmholtz frequency)=C*[SQRT(S/((L+X)*V))]/(2*pi),
- where C represents the speed of sound, S represents a vent area, L represents a vent length, R represents a vent radius, X represents 1.5*R, and V represents a container volume.
7 more elements
Dependencies are inferred from the claim text.