本科生毕业设计（论文）I摘 要智能公交系统是智能交通系统的重要研究内容，近年来开始出现了许多针对公交车辆智能化的研究与尝试，这其中就包括自动报站系统。目前，国内只有北京、上海、深圳、广州、青岛等城市实现了利用 GPS 自动报站，许多中小城市的公交车仍旧是传统的人工按键报站，没有实现完全的智能化，给司乘人员带来了很大的不便。因此，在中小城市中迫切需要智能化的公交车报站系统。本文应用单片机技术、语音合成技术和点阵 LED 汉字显示技术设计了一种公交车语音报站和汉字显示系统，它能很好的模仿人完成报站任务，从而解决了人工报站不准确不方便等问题。本文设计的新型的公交车自动报站系统，以AT89S51 单片机为核心，外扩 ISD1730 语音芯片，点阵 LED 汉字显示屏和行列驱动芯片。当汽车到达某站时通过 GPS 模块来触发本系统进行工作，通过语音输出电路进行语音报站和提示，AT89S51 单片机同时通过程序读取汉字信息送入 LED点阵显示电路进行汉字提示,达到了在车辆运行期间显示和语音的同步合作，提高了车辆的服务质量。本系统是以 AT89C51 为主控芯片的硬件总体设计方案，分析并设计了各单元电路，包括语音电路、LED 显示电路、电源电路等。随后进行程序编写、仿真，完成了整个系统硬件电路的功能设计。本文设计的公交车自动报站及汉字显示系统具有使用方便、体积小、经济实惠、工作稳定、误报率低等特点。关键词：单片机；语音报站； LED 汉字显示屏；ISD1730 本科生毕业设计（论文）IIAbstractAdvanced Public Transportation Systems (APTS) is an important part of IntelligentTransport System (ITS), and many researches and attempts related to the intelligent publictransport vehicles have come forth during recent years. At present, many city buses in China arestill the traditional manual buttons on station except Beijing, Shanghai, Shenzhen, Guangzhou,and Qingdao. Therefore, an intelligent bus-stop-announcing system is strongly required in thesecities.This paper introduces the design principle of a new bus automatic stop reporting system, which centers AT89S51 Single Chip Micyoco, concerning ISD1730 speech chip, dot matrix LED character display screen and line driver chip. When a bus reaches a certain stop, it makes this system to work through the GPS module. That is, through the speech output circuit to carry out the work of voice announcement and presentation, and at the same time AT89S51 Single Chip Micyoco carries out the character display through the read of characters and delivery to the LED dot matrix display circuit. In this way, a synchronic cooperation of display and speech during the operation of the vehicle is reached and the service quality of buses is improved.A design method of the Bus Station Report System based on AT89C51SND1C isput forward. This part mainly discusses hardware design, including power circuit, the systemclock circuit, reset circuit, USB interface circuit and Nand Flash memory circuit, etc. Practical application circuit and PCB layout of the components are given.The automatic stop reporting and character display system designed in this paper is convenient, small in size, economy, stable, and low in mistake rate.Key words: Single Chip Micyoco, Voice announcement, LED dot matrix character display screen, ISD1730 本科生毕业设计（论文）III目 录第 1 章 绪 论 .11.1 课题研究的背景和意义 .11.2 公交车报站的发展现状 .21.3 任务和工作内容 .3第 2 章 系统的总体方案设计 .42.1 方案论证 .42.2 最终方案决定 .6第 3 章 硬件电路设计 .73.1 单片机最小系统设计 .73.1.1 单片机简介 .73.1.2 引脚说明 .73.1.3 晶体振荡电路 .93.1.4 复位电路 .103.2 语音电路的设计 .123.2.1 语音电路芯片的介绍 .123.2.2 语音电路设计 .163.3 LED 显示电路设计 .173.3.1 LED 显示方式 .193.3.2 LED 驱动原理 .193.3.3 工作框图 .203.4 定位模块 .213.5 电源电路 .22第 4 章 系统软件设计 .234.1 主程序的设计 .244.2 子程序的设计 .254.2.1 LED 汉字显示程序 .