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Ford Global Technolgoies, LLC

Scott Clifton

Chris Todter

Paul Bremner

Paul Graeme Bremner

Artem Poliakov

Bill Gulker

Fei Liu

Yongjian Chen

An air extractor is provided for reducing wind throb in a vehicle. The air extractor includes a support having a first opening. A first flap is pivotally mounted to support frame in the first opening. The first flap is displaceable between a fully outwardly open position, a fully inwardly open position and an intermediate closed position. Further, the flap is tuned to a resonance frequency of between 12 and 18 hertz characteristic of the wind throb generated by the vehicle in which the air extractor is mounted.

Tuned air extractor to prevent wind throb in a vehicle

A first major aspect of the invention relates to an active noise cancelling system which detects ambient noise and applies electro-accoustic processing thereto to produce an acoustic signal for cancelling out the ambient noise. The active noise cancelling system may be used to cancel all noise but an audio signal which is desired to be heard by the user. A second major aspect of the invention relates particularly to a system for electronically cancelling noise input to a user microphone, by utilizing known characteristics of speech signal and ambient noise. The first major aspect of the invention can be used in concert with the second major aspect in a communication system at the earpiece of a telephone and the mouthpiece of a telephone.

Noise cancelling systems

Active noise cancellation system

Growing community of inventors

Queensland, Australia

Scott Clifton