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

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

Phone with adjustable sidetone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Pocket speakerphone

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

Portable telecommunications test instrument with a talk battery

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

Portable telephone apparatus

Telephonic communications – Substation or terminal circuitry – Amplifying

Portable telephone set

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Portable terminal

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

Post assembly process for adjusting the gain of an electret micr

Telephonic communications – Substation or terminal circuitry

Pots splitter with line impedance matching

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

Power efficient ADSL central office downstream class G power...

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

Power source control apparatus for telephone set

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

Power switch device utilizing phone loop signals to control...

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

Private branch exchange system

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Processing audio signals using a discrete state machine

Telephonic communications – Substation or terminal circuitry

Programmable keypad

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

Programmable plain old telephone line impedance matching...

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

Programmable telephone

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

Programmable telephone amplifier circuit interface

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

Protocol adaptation