4. Telecommunications
  5. Transmitter and receiver at same station
  6. Radiotelephone equipment detail

Christopher W. Springfield

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Double talk activity detector and method for an echo...

Telephonic communications – Echo cancellation or suppression – Disable or inhibit function
Reexamination Certificate

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Echo canceler circuit and method

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

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Full-duplex hands-free transparency circuit and method therefor

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2731014

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