4. Multiplex communications
  5. Wide area network
  6. Packet switching

Yuzo Fukushi

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Adaptive echo canceller

Multiplex communications – Wide area network – Packet switching
Patent

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Teleconference system using expanders for emphasizing a desired

Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent

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Tone responsible disabler circuit for an echo canceller

Telephonic communications – Echo cancellation or suppression
Patent

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Profile ID: LFUS-PAI-P-1534115

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