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US 2006/0251266 A1Published application
Adaptive personal active noise system
OwnerWilliam Saunders, Michael Vaudreyinventors
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Abstract
An improved active noise reduction system which has a transducer, an electro-acoustic sensing means including adjacent to the transducer, an attenuation means with electro-acoustic sensing means to attenuate selected sound frequencies, said system utilizing both feed forward control means and feedback control means comprising a heteronomous electronic controller with algorithmic transfer function and said controller being individually operable.
Claims24
A heteronomous controller of a personal active noise attenuation system comprising:
- a feedback controller adapted for receiving an acoustically transduced signal from a noise error sensor and for generating a feedback active noise attenuating control signal portion;
- a feedforward controller adapted for:
- receiving the acoustically transduced signal from the noise error sensor;
- receiving a noise reference signal from a noise reference signal sensor;
- and
- applying an adaptive signal processing algorithm to the acoustically transduced signal from the noise error sensor and to the noise reference signal to generate an adaptive active noise attenuation control signal portion;
- and
- a linear combiner adapted for summing a linear combination of the feedback active noise attenuating control signal portion and the adaptive active noise attenuation control signal portion so as to generate a heteronomous control signal.
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Dependencies are inferred from the claim text.