4. Telephonic communications
  5. Echo cancellation or suppression
  6. Using digital signal processing

Zhao Li

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Echo canceller for a full-duplex communication system and...

Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate

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Flat-panel TV

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Video
Design Patent

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