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

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Asymmetric digital subscriber line system capable of...

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

Attended messaging machine

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Attenuation and termination circuit using impedance synthesis

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Audibility enhancement

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

Audio interface for satellite user terminals

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Audio system for conferencing/presentation room

Telephonic communications – Substation or terminal circuitry – Amplifying

Audio transmission circuit comprising a transmit amplifier in th

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

Auto host disconnect on loss of power to a headset amplifier

Telephonic communications – Substation or terminal circuitry

Automated microphone switch controlled by a CTI combo

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Automated near-end distortion detection for voice...

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

Automatic balancing circuit for longitudinal transmission system

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

Automatic disconnect device with protected ringer

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Automatic gain control in a loudspeaker telephone set

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

Automatic hangup apparatus for restoring service to off-hook tel

Telephonic communications – Substation or terminal circuitry – Hold circuit

Automatic release device for automatically releasing the hold-on

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

Automatic sidetone selector

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Automatic volume adjustment of voice transmitted over a...

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

Automatically variable circuit of sound level of received voice