CLASSROOM AMPLIFICATION SYSTEM

本课题的目的是开发一个基于数字900mhz无线技术的教室扩音系统。对这种扩音系统的需求之所以出现，是因为常规教室中有大量学生因中耳炎而出现短暂性听力损失，而特殊教室中受到同样问题影响的人数甚至更多。最近的研究表明，平均而言，25%至30%的小学生在任何时候都会有这种听力缺陷，尽管其中只有很小一部分会被归类为听力受损。对于特殊需求班，这个数字接近75%。国家卫生统计中心收集的数据表明，1981年至1988年间，这一问题在15岁及以下儿童中至少增加了45%，在2岁及以下儿童中增加了224%。很明显，由于调频无线电通信系统通常形式固有的干扰问题，目前在教室中使用的方法不能在任何一所学校的几个房间中使用，否则就会出现严重的干扰问题。可用于电话行业的大量开发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优于其他调频系统。购买和再制造这种用于教室的手机，使得以极低的成本放大几乎所有教室的技术成为可能。建议的商业应用：该设备具有广泛的市场潜力，仅在美国就有超过200万间教室。它在便携式放大系统方面也有很大的潜力。

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.