广播中继系统与心电监护系统设计

发布时间：2018-11-20 15:21

【摘要】：嵌入式系统是为特定应用而设计的专用计算机系统,其以应用为中心、以计算机技术为基础,软件硬件可裁剪,对功能、功耗、体积、成本及稳定性有严格要求。我们生活在满是嵌入式的世界里,从手表、手机、电话、电饭锅到船舶、汽车、军事装备、航空航天,嵌入式无所不在。本文设计了基于嵌入式技术的调频广播中继系统和ECG监护系统。随着调频广播技术和接收技术的发展,调频广播的覆盖范围也在不断地扩大,但是对于山区、涵洞等特殊地形,调频广播存在弱信号区和盲区。为解决隧道内无法接收无线广播信号的问题,本文提出了一种传输基带数字音频信号的调频广播中继系统的设计方案。本方案在控制端利用专用FM解调芯片Si473x将需要转播的FM频道信号接收下来转换成基带数字音频信号,再将多路数字音频信号复用后通过光纤传输到隧道内部,隧道内的终端恢复出数字音频信号并进行FM调制后输出。本方案的优势是占用光纤带宽小,转播方式灵活;不仅可以转换广播信号的调制频道,而且支持插播来自控制台的音频内容以及RDS信息。心电图对于监控心脏活动状态具有重要作用,而市面上已有的便携式心电监护仪体积大、功耗高,不能长时间持续运行。本文设计了由移动Android设备和心电数据采集模块组成的心电实时监护系统,两者之间通过低功耗的蓝牙BLE协议实现数据通信。系统中的数据处理功能在Android移动设备上实现,因而数据采集模块具有结构简单、体积小、功耗低的特点。该系统可实现长时间连续监测人体心电信号的功能,具有广阔的应用前景。
[Abstract]:Embedded system is a special computer system designed for specific applications. It is application-centered and based on computer technology. The software and hardware can be clipped. It has strict requirements for function, power consumption, volume, cost and stability. We live in an embedded world, from watches, cell phones, telephones, electric cookers to ships, cars, military equipment, aerospace, embedded everywhere. This paper designs the FM broadcast relay system and ECG monitoring system based on embedded technology. With the development of FM broadcasting technology and receiving technology, the coverage of FM broadcasting is also expanding. However, for special terrain such as mountain areas, culverts and other special terrain, FM broadcasting has weak signal area and blind area. In order to solve the problem that the radio broadcast signal can not be received in the tunnel, a design scheme of FM broadcasting relay system for transmitting baseband digital audio signal is proposed in this paper. In the control end, the special FM demodulation chip Si473x is used to convert the FM channel signal needed to be relayed into baseband digital audio signal, and then multiplexing the multi-channel digital audio signal to the tunnel through optical fiber. The terminal in the tunnel recovers the digital audio signal and outputs after FM modulation. The advantages of this scheme are that it takes up less fiber bandwidth, and the broadcast mode is flexible, and it can not only convert the modulation channel of broadcast signal, but also support the audio content from the console and RDS information. Electrocardiogram (ECG) plays an important role in monitoring the state of cardiac activity. However, the existing portable ECG monitor in the market is large in size, high in power consumption, and can not be continuously operated for a long time. In this paper, a real-time ECG monitoring system composed of mobile Android device and ECG data acquisition module is designed. The data communication between them is realized by low-power Bluetooth BLE protocol. The data processing function of the system is realized on the Android mobile device, so the data acquisition module has the characteristics of simple structure, small volume and low power consumption. The system can realize the function of continuously monitoring human ECG for a long time, and has a broad application prospect.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP368.1;TN93;TP274

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