4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Network interface device

Matra Communications

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Acoustical echo canceller having an adaptive filter with passage

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Analysis-by-synthesis speech coding method with truncation of th

Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent

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