Noise control device
First Claim
1. A noise control device for reducing a plurality of noises arriving at a control point by radiating a control sound to the control point, the noise control device comprising:
- four or more noise detectors each for detecting the plurality of noises arriving thereat, and outputting the detected noises as a noise signal;
a control speaker for radiating, to the control point, the control sound based on each noise signal; and
a filter section for signal-processing noise signals from the noise detectors by using filter coefficients which respectively correspond to the four or more noise detectors and which are set such that the control sound from the control speaker reduces the plurality of noises arriving at the control point, and for adding up all the signal-processed noise signals, and for outputting a resultant signal to the control speaker, whereinthe four or more noise detectors are positioned so as to form a three dimensional space, andthe control point and the control speaker are positioned so as to be surrounded by the three dimensional space formed by the noise detectors.
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Accused Products
Abstract
A noise control device includes: four or more noise detectors each for detecting a plurality of noises arriving thereat, and outputting the noises as a noise signal; a control speaker for radiating, to a control point, a control sound based on each noise signal; and a filter section for signal-processing noise signals from the noise detectors by using filter coefficients which respectively correspond to the four or more noise detectors and which are set such that the control sound from the control speaker reduces the plurality of noises arriving at the control point, and for adding up all the signal-processed noise signals, and for outputting a resultant signal to the control speaker. The control point and the control speaker are provided within a polyhedral-shaped space whose apexes are placement positions of the noise detectors.
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Citations
20 Claims
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1. A noise control device for reducing a plurality of noises arriving at a control point by radiating a control sound to the control point, the noise control device comprising:
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four or more noise detectors each for detecting the plurality of noises arriving thereat, and outputting the detected noises as a noise signal; a control speaker for radiating, to the control point, the control sound based on each noise signal; and a filter section for signal-processing noise signals from the noise detectors by using filter coefficients which respectively correspond to the four or more noise detectors and which are set such that the control sound from the control speaker reduces the plurality of noises arriving at the control point, and for adding up all the signal-processed noise signals, and for outputting a resultant signal to the control speaker, wherein the four or more noise detectors are positioned so as to form a three dimensional space, and the control point and the control speaker are positioned so as to be surrounded by the three dimensional space formed by the noise detectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A noise control device for reducing a plurality of noises arriving at a control point by radiating a control sound to the control point, the noise control device comprising:
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four or more noise detectors each for detecting the plurality of noises arriving thereat, and outputting the detected noises as a noise signal; a control speaker for radiating, to the control point, the control sound based on each noise signal; and a filter section for signal-processing noise signals from the noise detectors by using filter coefficients which respectively correspond to the four or more noise detectors and which are set such that the control sound from the control speaker reduces the plurality of noises arriving at the control point, and for adding up all the signal-processed noise signals, and for outputting a resultant signal to the control speaker, wherein a three-dimensional space is defined within the noise detectors, and the control point and the control speaker are provided within the three-dimensional space, wherein the noise detectors are positioned such that a relationship a≦
c/2f is satisfied for each noise detector, wherein the distance from the adjacent noise detector is a, a sound velocity is c, and the upper-limit frequency of the control band is f. - View Dependent Claims (17, 18, 19, 20)
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Specification