基于单片机公交车准确语言报站系统.doc

摘 要 在交通高度发达、便利的今天，城市公交系统在我国仍占有举足轻重的地位。现在公交车上大部分都采用投币的购票方式，同时不再设有乘务员，因此公交车上报站器的好坏更是公交的实在表现。 本设计主要是利用89S51单片机作为CPU来进行总体控制，通过语音芯片ISD4004组成的语音控制电路能够建立多段语音库信息，并且可以对这些段的语音信息进行自由的组合，形成变化多样的语音提示信息，同时使用OCM4X8C液晶显示电路进行汉字显示，能够实现公交车的语音报站及汉字显示。在CPU控制模式下，键盘电路采用中断扫描模式，当有键按下时，系统产生中断，CPU响应中断后，即查询键号，通过软件来实现该键号所对应键的功能。因此当公交车到达某站时通过键盘来控制本系统进行工作，通过语音输出电路进行语音报站和提示，CPU同时通过程序读取汉字信息送入LCD液晶显示电路进行汉字提示。 通过本设计主要解决了如何方便、准确的指示乘客到站的问题，另外，该系统还可以为乘客提供各种各样的提示或警示服务，使得乘客能愉快、安全地上下车。 关键词：单片机；语音控制电路；液晶显示 Abstract In the transportation is highly developed and convenient society , urban public transport system in China still occupies a pivotal position. Most buses now have the ticket with coins , and no longer need a crew at the same time, so whether the bus station reported device is good or not becomes the performance of public transport. This design is mainly to use 89S51 microcontroller as CPU to carry out over all controls through the voice chip ISD4004 component of voice control circuit to build multi-segment voice library information, and can combine these segments speech information free , form a diverse voice prompts , meanwhile it uses OCM4X8C character LCD display circuit to achieve the bus station and character voice message display. In the CPU control mode, the keyboard interrupt scan mode circuit, the system generates an interrupt when a key pressed , CPU response to failure, the key number is inquired by the software to achieve the key number corresponding to the function keys. So when the bus reaches a certain point, through the keyboard to control the system to work, through the voice output circuit Sound Station and tips, CPU while the information through the program reads characters into the LCD liquid crystal display circuit character prompt. This design mainly addresses the problem that how to direct the passengers to the stations conveniently and accurately .In addition, this system can provide all kinds of points and warns to the passengers, ensure the secure of the passengers w