Impedance maintenance circuit for telephone interface

Impedance matching with sigma delta filter

Internet protocol telephone system

Line circuit and method for a line circuit

Linear, optical coupled line impedance circuit

Low-pass filters for splitterless pots and data transmission

Method and apparatus for an active impedance feedback

Method and apparatus for an improved analog echo canceller

Method and apparatus for handling voice and data signals

Method and apparatus for impedance matching

Method and apparatus for providing variable attenuation to...

Method and apparatus for transient suppression in an...

Method and circuit for adapting the impedance of an analog...

Method and circuit for implementing an impedance, in particular

Method and configuration for forming a line termination of a tel

Method for matching an adaptive hybrid to a line

Method for selecting impedance setting for loop start trunk...

Method of selecting impedance setting for loop start trunk line

Method, device and system for output impedance calibration...

Methods and apparatus for providing reciprocal impedance convers