CLASSROOM AMPLIFICATION SYSTEM

本工作的目的是开发一种基于900 MHz数字无绳技术的教室放大系统。之所以需要这种放大系统，是因为由于中耳炎导致的普通教室中有大量学生患有暂时性听力损失，而受同样问题影响的特殊需要教室的数量甚至更多。最近的研究表明，平均而言，25%至30%的小学儿童在任何时候都会有这种听力障碍，尽管其中只有很小一部分被归类为听力障碍。对于有特殊需要的班级，这一数字接近75%。国家卫生统计中心收集的数据表明，1981年至1988年间，15岁及以下儿童的这一问题至少增加了45%，2岁及以下儿童增加了224%。显然，由于通常形式的调频无线电通信系统固有的干扰问题，在发生严重干扰问题之前，教室中使用的目前方法不能在任何学校的几个以上的房间使用。电话业可获得的大量发展资金使他们能够以非常低的成本开发和销售900兆赫无绳电话的极其先进的技术。这些电话在消除干扰方面远远优于其他调频系统。购买和重新制造这种用于教室的手机，为以极低的成本放大几乎所有教室提供了技术上的可能性。拟议的商业应用：仅在美国200多万个教室中，该设备就具有广泛的市场潜力。它在便携式放大系统中也有很大的潜力。

The purpose of this work is to develop a classroom amplification system based on digital 900 MHZ cordless technology. The need for such amplification systems arises because of the large number of students in regular classrooms with transient hearing losses due to otitis media, and the even larger number of special needs classrooms effected by the same problem. Recent studies indicate that, on the average, 25% to 30% of children in primary schools will have this such hearing deficits at any given time, although only a very small percentage of these will be classed as hearing impaired. For special needs classes, the number approaches 75%. Data gathered by the National Center for Health Statistics indicates that this problem increased by at least 45% between 1981 and 1988 for children 15 and under, and by 224% for children age 2 and under. It is clear that because of interference problems inherent in the usual form of FM Radio communication systems, that the present methods used in classrooms cannot be used in more than a few rooms of any given school before serious interference problems occur. The large development funds available to the telephone industry has enabled them to develop and market extremely advanced technology in 900 MHZ cordless phone at very low cost. These phones are far superior to other FM systems at eliminating interference. Purchasing and re- manufacturing such phones for use in classrooms opens the technical possibility of amplifying virtually all classrooms at ver modest cost. PROPOSED COMMERCIAL APPLICATION: This device has extensive market potential in over 2,000,000 US classrooms alone. It also has great potential for portable amplification systems.