4. Telephonic communications
  5. Line equalization or impedance matching
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Impedance maintenance circuit for telephone interface

Telephonic communications – Line equalization or impedance matching
Patent

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Impedance matching with sigma delta filter

Telephonic communications – Line equalization or impedance matching
Reexamination Certificate

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Internet protocol telephone system

Telephonic communications – Line equalization or impedance matching
Reexamination Certificate

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