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

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

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

Side tone preventive circuit for telephone

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

Side-tone control within a telecommunication instrument

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

Sidestone reduction in full duplex transceivers

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Signal compression circuit, particularly for a telephone set

Telephonic communications – Substation or terminal circuitry – Amplifying

Signal detector with automatic gain control

Telephonic communications – Substation or terminal circuitry – Amplifying

Signal level expansion apparatus as for a telecommunications sys

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

Signal line driving circuit with self-controlled power...

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

Signal processsing circuit for a telephone set

Telephonic communications – Substation or terminal circuitry – Hold circuit

Single-line telephone hold circuit

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

Smart interface technology

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

Software configurable sidetone for computer telephony

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Software speakerphone system and method of operating a speakerph

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Sound pick-up method and device, in particular for handsfree...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Speaker drive arrangement for loudspeaker telephone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Speaker volume control for voice communication device