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

PictureTel Corporation

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Adaptive acoustic echo canceller having means for reducing or el

Multiplex communications – Wide area network – Packet switching
Patent

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Audio processor

Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion
Patent

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Audio processor

Data processing: generic control systems or specific application – Specific application – apparatus or process – Digital audio data processing system
Patent

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Channel aggregation having low latency and overhead

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate

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Cryptographic key exchange using pre-computation

Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent

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