4. Telephonic communications
  5. Substation or terminal circuitry
  6. Sidetone control or hybrid circuit
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Meter pulse filtering circuit for analog modems

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate

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Method and apparatus for decreasing distortion in a line...

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Method and apparatus for noise suppression and side-tone...

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate

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Method and apparatus for sidetone optimization

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Method of improving sidetone attenuation in electroacoustic syst

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Multi-channel echo canceler

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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