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

Telephonic communications – Substation or terminal circuitry

Call related information receiver unit

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Capacitive proximity sensors

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

Cell phone based animal sound imitation

Telephonic communications – Substation or terminal circuitry

Central office line interfacing circuit

Telephonic communications – Substation or terminal circuitry

Channel control and post filter for acoustic echo cancellation

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

Circuit and method of reducing sidetone in a receive signal path

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Circuit arrangement for a voice-controlled hands-free telephone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Circuit arrangement for controlling the volume range of a voice

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

Circuit for electronically generating a call impedance

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

Circuit for eliminating echo and side tones in a switching...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Circuit for hands free talking

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Circuit for suppressing white noise in received voice

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Class `D` audio speaker amplifier circuit with state variable fe

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

Combined sidetone and hybrid balance

Telephonic communications – Substation or terminal circuitry – Visual signalling

Communication apparatus

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

Communication device comprising an off-hook detection circuit

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

Communication interface having combined shaping of receive...

Telephonic communications – Substation or terminal circuitry – Hold circuit

Communication system, exchange and communication holding...