4. Electrical audio signal processing systems and devices
  5. Acoustical noise or sound cancellation
  6. Particular transducer or enclosure structure
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Noise canceling microphone system and method for designing...

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Particular transducer or enclosure structure
Reexamination Certificate

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Noise canceling microphone with acoustically tuned ports

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Particular transducer or enclosure structure
Reexamination Certificate

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