Methods and apparatus for providing reciprocal impedance convers

Modular attenuator

Multiplexing and demultiplexing of narrowband and broadband...

Programmable multiple-standard digital communications system

Resistance forward telephone line feed circuit

Scaled impedance replica for echo attenuation in digital...

Selectable impedance line interface circuit

Signal interface circuit with selectable signal interface parame

Simulating changes in telephone subscriber line

Subscriber line circuit having improved AC impedance matching

Subscriber line interface circuit

Subscriber line interface circuitry

Synthesized telephone line ring signal impedance termination

System and method for providing a frequency dependent...

System and method for transmission system automatic impedance ma

Telecommunication circuit and a telecommunication device

Telephone line interface circuit with intelligent line...

Telephone line interface circuit with virtual impedance

Transmission input/output device with reduced power consumption

Universal impedance matching network for the subscriber line...