4. Telephonic communications
  5. Substation or terminal circuitry
  6. For loudspeaking terminal
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System and method for controlling a filter to enhance...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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System and method for low-power echo and NEXT cancellers

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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Systems and arrangements for controlling modes of audio...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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