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

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Subscriber telephone set with amplified loudspeaker reception wi

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Switch with plural rotors

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Switching control apparatus for intercom-telephone sets

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Switching device for power supply to additional accessories for

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

Synthetic termination

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

System and method for adapting an analog echo canceller in a...

Telephonic communications – Substation or terminal circuitry – Visual signalling

System and method for cleaning the display screen of a touch scr

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

System and method for controlling a filter to enhance...

Telephonic communications – Substation or terminal circuitry – Wire distribution

System and method for distributing enhanced telephony...

Telephonic communications – Substation or terminal circuitry

System and method for generating a simultaneous mixed audio...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

System and method for low-power echo and NEXT cancellers

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

System and method for providing user feedback to couple an elect

Telephonic communications – Substation or terminal circuitry – Hold circuit

System and method to provide control of music on hold to the...

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

System for the processing of audio data used for music on...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Systems and arrangements for controlling modes of audio...

Telephonic communications – Substation or terminal circuitry – Noise suppression

Systems and methods for reducing noise in ADSL transmissions