基于LabVIEW音频测试系统设计

电子信息工程论文编号:DZXX128  论文字数:9396,页数:36

 
目录
摘要 I
ABSTRACT II
第1章 引言 1
1.1 背景 1
1.2 研究内容 1
第2章 音频测试系统 3
2.1 Labview概述 3
2.2 音频测试系统结构 3
2.2.1 音频测试结构图如下 3
2.2.2 音频测试系统硬件模块放大电路 3
2.2.3 滤波电路 5
2.2.4 LM324功能介绍 6
2.3音频测试系统软件模块 6
第3章 音频分析原理 9
3.1 数字信号处理基本理论 9
3.1.1 傅立叶变换 9
3.1.2 信号的采样 10
3.2 失真分析 13
3.3 相关分析 14
3.3.1 自相关函数 14
第4章 音频测试系统设计 16
4.1 音频测试系统硬件电路 16
4.2 LABVIEW程序的后面板 16
4.2.1 音频测试系统时域模块 16
4.2.2 音频测试系统的频域模块 17
4.2.3 音频测试系统音频信号失真模块 18
4.2.4 音频测试系统音频信号自相关模块 18
4.3 LABVIEW程序的前面板 19
4.4 音频测试系统数据结果分析 21
第5章 结束语 27
致谢 29
参考文献 30
附录 31

摘要
 随着微电子技术、计算机技术、网络通信技术和软件技术的高速发展,传统的仪器开始向计算机化的方向发展。虚拟仪器(VI)概念的产生正是基于这样一种技术背景。虚拟仪器是指具有虚拟仪器面板的个人计算仪器。它利用软件在微机屏幕上构成虚拟仪器面板,在硬件的支持下对信号进行采样,既可以进行实时的信号分析、显示,又可以在离线条件下对存储的采集结果进行各种软件处理。通过软件编写及硬件配置,虚拟仪器可以实现完全由用户自己定义、适合不同应用环境和对象的各种功能。虚拟仪器技术在国内正处于蓬勃发展之中,在测试、测控、教学、科研等领域获得了广泛的应用。
 本文介绍了将虚拟仪器技术引入到音频分析仪器的设计,采用LabView编写程序。通过测试典型的音频放大器,检测虚拟式音频放大器测试的实用效果,测量音频信号的电压与频率、时域幅值分析、频域分析、失真分析和信噪比等。
 本文分析了基于LabView音频测试系统的工作原理。对基于LabView音频测试系统进行模块化分析,其中,重点介绍了时域分析、频域分析。
 
关键词：音频测试系统,时域分析,频域分析
 
 
 
ABSTRACT
 With micro-electronics technology,computer technology, network communications
 technology and the rapid development of software technology, the traditional computerized equipment have began to develop in the direction of。Virtual Instrument (VI) concept is based on the formation of such a technical background。Virtual machines refer to a virtual instrument panel of personal computing equipment。It used computer software on the screen in a virtual instrument panel, with the support of the hardware in the signal sampling, can conduct real-time signal analysis, display, but also in offline storage under the condition of the acquisition deal with the results of various software。Through the preparation of software and hardware configuration, virtual instrument can be achieved solely by the user's own definition, suitable for different applications and objects of various functions。Virtual instrument technology in the country is in a vigorous development, testing, monitoring and control, teaching, scientific research in areas such as access to a wide range of applications。
 This paper presents a virtual instrument technology will be introduced to the analysis of audio equipment design, use of LabView programming, Pass the test of a typical audio amplifier to detect virtual audio amplifier test the practical effects, the audio signal measuring voltage and frequency and amplitude of time-domain analysis, frequency analysis, distortion and signal to noise ratio analysis, and so on。
 This paper analyses the LabView-based audio test system works。LabView-based audio test system of modular, which focuses on a time-domain analysis, frequency analysis。
 
Keywords: Audio Test System, Time-domain analysis, Frequency domain analysis