| 摘要 |
PURPOSE: A group study service providing system using a telephone is provided to smoothly perform communication between a lecturer and a learner by preventing echo generated in a distance education service providing process. CONSTITUTION: An Internet phone service providing server(12) constructs internet communication between a telephone for a learner and a lecturer. A router(14) is connected between a telephone and the Internet phone service providing server. An audio signal controller(100) mixes an audio transmitting signal and an audio receiving signal. A lecturer audio signal input terminal and output terminal outputs lecturer audio signals. |
