LandOfFree - US Patents - Listing for Telephonic communications,Substation or terminal circuitry

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit

Power switch device utilizing phone loop signals to control...

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Private branch exchange system

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Processing audio signals using a discrete state machine

Telephonic communications – Substation or terminal circuitry

Programmable keypad

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

Programmable plain old telephone line impedance matching...

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Programmable telephone

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Programmable telephone amplifier circuit interface

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Protocol adaptation

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Radio and land-line telephones with hands-free operation

Telephonic communications – Substation or terminal circuitry

Real-time audio buffering for telephone handsets

Telephonic communications – Substation or terminal circuitry – Hold circuit

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

Telephonic communications – Substation or terminal circuitry – Noise suppression

Receiving section of a telephone with suppression of...

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

Regulator for impedance balance of a transmission wire pair

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Remote party speaker phone detection

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Safety switch for communication device

Telephonic communications – Substation or terminal circuitry – Visual signalling

Screen-based telephone set for interactive enhanced telephony se

Telephonic communications – Substation or terminal circuitry – Visual signalling

Screen-based telephone set for interactive enhanced telephony se

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Self-configuring telephone interface unit

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Shunt regulator for hands-free telephone