Noise attenuation
First Claim
1. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, the diaphragm being divided up into separate areas, each area having a corresponding sensing means cooperating with a deflecting means, so that each area of the diaphragm is separately driven.
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Abstract
Apparatus for attenuating noise, particularly in an aircraft cabin, comprising a diaphragm (10) one side of which is subjected to the noise, sensing means (16) for sensing the displacement of the diaphragm in response to the noise, and deflecting means (20) responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm.
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Citations
24 Claims
- 1. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, the diaphragm being divided up into separate areas, each area having a corresponding sensing means cooperating with a deflecting means, so that each area of the diaphragm is separately driven.
- 10. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, wherein the deflecting means are driven from the sensing means through a negative feedback loop which acts to null the displacement of the diaphragm, and wherein said apparatus is incorporated in headphones.
- 13. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, wherein the deflecting means are driven from the sensing means through a negative feedback loop which acts to null the displacement of the diaphragm, and wherein the diaphragm is divided up into separate areas, each area having a corresponding sensing means cooperating with a deflecting means, so that each area of the diaphragm is separately driven.
- 16. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, said apparatus being incorporated in headphones.
- 19. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, wherein the deflecting means are driven from the sensing means through a negative feedback loop which acts to null the displacement of the diaphragm, the feedback loop includes an amplifier with an input to which an audio signal can be fed whereby the diaphragm will be deflected in accordance with the audio signal, and wherein the diaphragm is divided up into separate areas, each area having a corresponding sensing means cooperating with a deflecting means, so that each area of the diaphragm is separately driven.
- 22. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, wherein the deflecting means are driven from the sensing means through a negative feedback loop which acts to null the displacement of the diaphragm, the feedback loop includes an amplifier with an input to which an audio signal can be fed whereby the diaphragm will be deflected in accordance with the audio signal, and wherein said apparatus is incorporated in headphones.
Specification