AVT-44

Audio teleconference interface which is a component of audio or video teleconferencing systems; audio teleconference interfaces comprising one or more of the following components - acoustic echo cancellation window, variable input high pass filter for ambient noise control, microphone inputs, expansion line level inputs and outputs, amplifiers, simultaneous wire operation, four wire interface to codec or transmission circuit, two wire interface to telephone line, serial ports, dtmf dialing, firmware upgrade, and remote control; audio teleconference interfaces for optimizing individual room acoustics and cancelling echoes; audio/video teleconference interfaces; teleconference interfaces specifically designed for integration into higher level audio and video teleconferencing systems