LandOfFree - US Patents - Listing for Telephonic communications,Substation or terminal circuitry,Conversion of signal form

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

Adaptive telephone handset interface

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

Adaptive telephone interface

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

Apparatus and method for determining the presence and polarity o

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

Apparatus and method for dual mode phone

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

Apparatus for accessing function code in telephone

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

Audio interface for satellite user terminals

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

Automatic disconnect device with protected ringer

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 – Conversion of signal form

Automatically variable circuit of sound level of received voice

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

Background noise compensation in a telephone set

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

Background noise compensation in a telephone set

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

Bone conductive ear microphone and method

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

Cascade low-pass filter to improve xDSL band attenuation for...

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

Communication device comprising an off-hook detection circuit

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

Communication terminal apparatus

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

Computer telephony headset amplifier

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

Connection apparatus for connecting a digital or analog...

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

Connection apparatus for connecting a digital or analog...

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

Dial tone annunciating system and method