Foreign Language Education Utilizing Wireless Infrared Ray Transmission System

采用光扩散无线局域网和不受位置限制的笔记本电脑，对外语教学系统进行了研究。在我们的研究中所采用的系统的主要特点描述在下面。首先，采用IEEE802.3 10BASE-T中采用的CSMA/CD （Carrier Sense Multiple Access with Collision Detection）技术。它在信号碰撞检测方面比CSMA/CA （CSMA with collision Avoidance）有更大的优势。其次，软件正在运行，这是在一个典型的机房使用。它可以双向传递信息，从教师到学习者，反之亦然。这里的信息包括显示的图形信息和保存的文件。教师和学习者之间的语音双向数字传输被添加到典型电脑室使用的软件中。第三，教师可以在这个系统中单独处理一组学习者。实践证明，该系统可以有效、广泛地应用于外语教学中。它可以适用于四项技能的每一个方面，即读、写、听、写。发现了一个小问题。语音传输延迟超过一秒已被检测到。我们大多数人都已经经历过这种延迟在国际电话和电视节目，发现它使沟通有些困难。总之，我们已经找到了超越LL和电脑室等设施的具体限制的可能性。红外线传输装置几乎可以安装在所有教室的天花板上。如果您携带与光局域网兼容的笔记本电脑，那么您可以在其有效区域内自由地建立您的指令系统。

Studies of a foreign language instruction system have been carried out by means of wireless LAN with optical diffusion method and note PCs, which do not limit location.Chief characteristics of the system employed in our studies are described in the fllowings. First, CSMA/CD (Carrier Sense Multiple Access with Collision Detection) adopted in IEEE802.3 10BASE-T is employed.It has exceeding advantage of collision detection of signals over CSMA/CA (CSMA with Collision Avoidance). Second, software is in operation, which is used in a typical computer room. It can transmit information bi-directionally from an instructor to learners and vice versa. The information here includes graphical information in display and saved files. Bi-directional digital transmission of speech sounds between an instructor and learners is added to its software used at a typical computer room. Third, an instructor can handle a group of learners individually in this system.It has turned out that the system can be used effectively and extensively in foreign language instructions. It can be applicable to every aspect of four skills, that is, reading, writing, listening and writing.A little problem is found. A transmission lag of speech sounds over one second has been detected. Most of us have already experienced this kind of lag in an overseas call and a TV program to find that it makes communication somewhat difficult.In conclusion, we have found possibilities to go beyond the specific restriction of facilities such as an LL and a computer room. Infrared ray transmission can be located on almost all classroom ceilings. If you bring your note PC compatible with optical LAN, then you can build up your instruction system freely within its effective area.