| 摘要 |
PURPOSE: A wireless lab system for learning foreign languages is provided to make a wireless interactive communication between a lecturer and students so that it can reduce facility cost and enhance an education effect. CONSTITUTION: The system comprises a micro controller(101), a power supply(102), an RF communication module(103), a compander circuit(104), a transmission dip switch(105), a receiving dip switch(106), a free amplifier(107), an output amplifier(108), a microphone input terminal(109), an ear phone terminal(110), an external input terminal(111), an external output terminal(112) and a mixer(113). The micro controller(101) controls an overall operation of the system by embedding an operation program. The RF communication module(103) transmits or receives wireless voice or image data. The compander circuit(104) eliminates noise by compressing and decompressing the wireless voice data.
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