4. Electrical audio signal processing systems and devices
  5. Directive circuits for microphones

Hiroki Furukawa

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Array microphone

Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent

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Digital audio broadcasting receiver

Pulse or digital communications – Receivers
Reexamination Certificate

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Echo canceller

Multiplex communications – Wide area network – Packet switching
Patent

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Howling canceller

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Null symbol detection device

Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1160784

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