4. Electrical audio signal processing systems and devices
  5. Acoustical noise or sound cancellation
  6. Within duct
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Method and apparatus for active noise control in an air...

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Reexamination Certificate

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Method and apparatus for active noise control of high order mode

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Patent

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Method and apparatus for controlling exhaust noise

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Reexamination Certificate

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Method and equipment for attenuating sound in a duct

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Reexamination Certificate

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Modular active silencer with port dish

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Patent

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Mounting assembly for active noise attenuation system

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Reexamination Certificate

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