毕业设计----低频信号分析仪软件设计与实现.docVIP

低频信号分析仪软件设计与实现 摘要：随着微电子技术，计算机技术，网络通讯技术和软件技术的高速发展，在实验室和工业应用中，和相角，然后通过计算得到的特征值，将信号的频谱，时间域波形等显示出来。由波形图和频谱图分析得知信号的周期，峰峰值，频率等，从而实现对信号进行分析和计算。虽然本次毕业设计虽然能够基本完成设计要求，但是还有很多地方需要改进。串行通信Low Frequency Signal Analyzer Software Design and Implementation Abstract: With the micro-electronics technology, computer technology, network communication technology and the rapid development of software technology in the laboratory and industrial applications, the traditional start to the computerized equipment direction. The signal through the serial port to a computer through transmission and sampling by the design of the software inside the signal in time domain and frequency domain of analysis and computation is teaching and research will bring a lot of unexpected convenience. This design using Visual C + + 6.0 serial port module to complete the design, so that it can achieve signal reception. Then MATLAB generated signal, the signal generated by the Fourier transform, Fourier transform can be obtained from the amplitude and phase angle, and then calculated the eigenvalues of the signal spectrum, time domain waveform display. By the waveform and spectrum analysis showed that the signal cycle, peak to peak, frequency, etc., in order to achieve the signal analysis and calculation. While this can basically complete the graduation project design requirements though, but there are many areas for improvement. Keywords: serial communication; signal sampling; Fourier transform; signal analysis   目录 摘要 I Abstract II 目录 Ⅲ 第1章 前　言 1 1.1本论文的研究背景和意义 1 1.2论文研究内容 1 1.3论文研究重点 2 第2章　信号的输入 3 2.1串口通信模块 3 2.1.1基本原理 3 2.2 串口通信和RS-232 5 2.2.1 RS-232通信协议 5 2.2.2 RS-232串行接口标准 6 2.2.3 RS-232接口定义 6 2.2.4串口信号线的接法 7 2.3 Visual C++ 及MFC简介 8 2.4 实现串行通信 10 2.4.1在当前工程添加MSCOMM控件 10 2.4.2 初始化串口：设置MSComm控件的属性 12 2.4.3数据接收函数OnComm() 13 2.4.4 发送数据 15 2.4.5 程序调试 16 2.5 本章小节 17 第3章 信号的分析和计算 18 3.1信号分析的原理及意义 18 3.2 信号的分类与预处理 19 3.3信号的采样 22 3.3.1 奈奎斯特采样定理 22 3.4信号的时域分析 24 3.5信号的频域分析 24 3.5.1 信号的频谱分析 24 3.5.2 DFT及FFT算法