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US 5,208,868 AGranted
Headphone overpressure and click reducing
AssigneeBose Corporation
InventorRoman Sapiejewski
Life of this patent
Estimating the term…
Abstract
Apparatus for reducing pressure inside a headphone includes a port between front and back cavities. Preferably there is a resistive element and a high compliance diaphragm.
Claims7
Apparatus for reducing pressure in a headphone comprising
- a headphone having a front and back cavity;
- and
- a port tuned to about 50 Hz inserted between the front and back cavities of the headphone,
- said port being a combination of a mass element and a resistive element with said resistive element in said port.
1 more element
Apparatus for reducing pressure in a headphone comprising,
- a headphone having a front and back cavity;
- and
- a port inserted between the front and back cavities of the headphone,
- wherein said port is a combination of a mass element and a resistive element,
- wherein said mass element provides high acoustic impedance to negligibly reduce passive noise attenuation,
- wherein said mass element comprises
- a hexagonal section having a threaded inner surface;
- and
- a threaded portion having the same diameter as the inner surface of the hexagonal section.
6 more elements
Apparatus for reducing pressure in the headphone comprising,
- a headphone having a front and back cavity;
- and
- a port inserted between the front and back cavities of the headphone,
- wherein said port is a combination of a mass element and a resistive element,
- wherein said apparatus provides active noise reduction and includes a feedback loop with said resistive element providing a first order roll-off for stability of the feedback loop.
2 more elements
Apparatus for reducing pressure in a headphone comprising,
- a headphone having a front and back cavity;
- and a port tuned to about 50 Hz inserted between the front and back cavities of the headphone,
- wherein said port is a combination of a mass element and a resistive element,
- wherein said mass element provides high acoustic impedance to negligibly reduce passive noise attenuation,
- wherein said mass element comprises
- a hexagonal section having a threaded inner surface;
- and
- a threaded portion having the same diameter as the inner surface of the hexagonal section.
5 more elements
Apparatus for reducing pressure in a headphone comprising,
- a headphone having a front and back cavity;
- and
- a port tuned to about 50 Hz inserted between the front and back cavities of the headphone,
- wherein said port is a combination of a mass element and a resistive element,
- wherein said apparatus provides active noise reduction and includes a feedback loop with said resistive element providing a first order roll-off for stability of the feedback loop.
2 more elements
Dependencies are inferred from the claim text.