4. Telephonic communications
  5. Substation or terminal circuitry
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Radio and land-line telephones with hands-free operation

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Real-time audio buffering for telephone handsets

Telephonic communications – Substation or terminal circuitry
Reexamination Certificate

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Receiver device for receiving ringing signals in an off-hook lin

Telephonic communications – Substation or terminal circuitry – Hold circuit
Patent

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Receiving section of a telephone with suppression of...

Telephonic communications – Substation or terminal circuitry – Noise suppression
Reexamination Certificate

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Regulator for impedance balance of a transmission wire pair

Telephonic communications – Substation or terminal circuitry – Impedance matching or line equalizing
Reexamination Certificate

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Remote party speaker phone detection

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

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