4. Electrical audio signal processing systems and devices
  5. Acoustical noise or sound cancellation
  6. Adjacent ear

Robert J. Hansen

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Method and apparatus for active cancellation of noise in a liqui

Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
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Towed array strain-sensing noise canceller

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
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