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

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Line interface with analog echo cancellation

Telephonic communications – Substation or terminal circuitry – Amplifying

Line powered universal telephone amplifier

Telephonic communications – Substation or terminal circuitry – Visual signalling

Line use indicator in a telephone set

Telephonic communications – Substation or terminal circuitry

Long distance bidirectional driver

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loop gain processing system for speakerphone applications

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loudspeaker gain correction for a hands-free telephone terminal

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loudspeaker telephone device comprising a novel noise suppressin

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loudspeaker volume range control

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loudspeaking telephone instrument

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loudspeaking telephone set having an anti-Larsen device for inst

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loudspeaking telephone station including directional microphone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Loudspeaking telephone with a frequency shifting circuit

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Low current signal compression circuit

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

Low power dialer

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

Low-pass filtering device with integrated insulator and...

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

Menu level indicator for a telephone terminal

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Message playback concurrent with speakerphone operation

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

Meter pulse filtering circuit for analog modems

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

Method and an arrangement for controlling the operating mode of