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论文编号:ZD983 论文字数:16483,页数:40
摘 要
目前市售的数据采集卡都包含了完整的数据采集电路和与计算机的接口电路，但其价格与性能基本成正比，一般比较昂贵。随着DSP(数字信号处理)技术走向成熟，PC声卡本身就成为一个优秀的数据采集系统。
声卡音频处理主要是利用计算机声卡代替普通采集卡作为硬件，用数据分析和处理功能非常强大的工程使用软件LabVIEW作为软件开发平台，设计了一个较高采样精度、中等采样频率、灵活性好的声卡数据采集系统。在LabVIEW环境中实现了音频信号的采集分析及数据存盘,且具有高精度采集率，采集到的信号失真小，并不逊于数据采集卡。具有实现简单、界面友好、性能稳定可靠等诸多优点。计算机上配置多块声卡即可构成实时、高信噪比的多通道数据采集系统。在语音识别、环境噪声监测和实验室测量等多种领域中具有广阔的前景。生成的采集软件交互性好，操作方便，并且可以根据用户的需求进行功能扩充，为低成本下构建数据采集系统提供了一种思路。
关键词：虚拟仪器 声卡 数据采集 信号分析
Abstract
At present the market data acquisition card contains a complete data acquisition circuits and computer interface circuits, but its price and performance is directly proportional to the basic, general more expensive. With the DSP (digital signal processing) technology to mature, PC sound card itself into an outstanding data acquisition system.
The internship is mainly using computer sound card as a substitute ordinary acquisition hardware, Use data analysis and processing functions very powerful LabVIEW software works as a software development platform, design a high sampling accuracy, the middle-sampling frequency, flexibility, good sound data acquisition system。In LabVIEW environment to achieve the audio signal acquisition and analysis and data archiving And has a high accuracy rate of acquisition，Acquisition to the small signal distortion，is not comparable to data acquisition card. A simple, user-friendly, stable and reliable performance , and many other advantages. Computer sound card configuration can block more than a real-time, high signal to noise ratio of multi-channel data acquisition system. In speech recognition, environmental noise monitoring and laboratory measurements in the field such as has broad prospects. Acquisition Software generated interactive, and easy to operate, and can be carried out according to the user''s needs expand function for the construction of low-cost data acquisition system provides an idea.
Key words: Virtual Instronmention 、 Sound card 、 Data acquisition 、 Signal analysis Mulfithreading
目 录
摘 要 I
Abstract II
1绪论 1
1.1 背景 1
1.2 任务与目标 1
1.3 发展状况 2
2 总体设计方案 4
3 声卡的认识 5
3.1 声卡的作用 5
3.2 声卡的硬件结构 5
3.3 声卡工作原理及主要性能指标 6
4 LabVIEW中有关声卡的函数介绍 8
5 系统功能设计 10
5.1 硬件的实现 10
5.2 后面板设计——软件设计 10
5.2.1 数据采集 11
5.2.2 信号分析 17
5.2.2.1 声音信号的时域分析 17
5.2.2.2 声音信号的频域分析 17
5.2.3 信号发生器的产生及进一步处理 20
5.3 前面板设计 24
6 程序的运行及调试 27
6.1 程序的运行与调试 28
6.2 编程中的问题 29
6.2.1问题与解答 29
6.2.2 LabVIEW程序慢在哪里 30
6.3 个人经验 32
7 总 结 33
致 谢 34
参考文献： 35
附件 36
