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

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

High performance telephone instrument with combination pulse and

Telephonic communications – Substation or terminal circuitry – Visual signalling

High voltage message waiting circuit

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

High-frequency noise elimination for use in telephone systems

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Histogram-based processing of audio signals

Telephonic communications – Substation or terminal circuitry – Hold circuit

Hold circuits for telephone systems

Telephonic communications – Substation or terminal circuitry – Hold circuit

Hook-flash simulation in parallel with off-hook devices

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Howling canceller

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

Impedance blocking filter circuit for digital subscriber...

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

Impedance compensation in interfacing a modem to a telephone...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Information processing terminal, operation content notifying...

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

Input-output balanced filter

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

Input-output balanced filter

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

Input/output circuit for a communication device

Telephonic communications – Substation or terminal circuitry

Integrated circuit configurations and methods for providing...

Telephonic communications – Substation or terminal circuitry – Amplifying

Integrated circuit for the transmission of telephone signals

Telephonic communications – Substation or terminal circuitry – Hold circuit

Integrated loop current detector apparatus for a PSTN modem

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

Interface for a telephone set

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Key telephone system

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

Latching relay drive circuit for use in telephone sets