基于Labview的音频采集系统设计(任务书,开题报告,论文13000字)
摘 要
相比于传统的音频采集卡，本文利用了LabVIEW 软件，并结合计算机声卡设计了一款操作便捷、实用性较强的音频信号采集、分析系统。首先介绍了音频采集信号的基本原理，然后介绍了计算机声卡的硬件结构和工作原理，结合虚拟仪器软件创建程序结构模块化的特点，分步设计系统。信号采集是信号分析与处理的关键，传统的音频采集卡的价格比较高并且兼容性差，从设计方案上对比来看，计算机声卡作为一种特殊的数据采集卡，具有价格廉价、实用性强、拓展性好的优点。并且虚拟仪器提供了有关计算机声卡的函数，借助于虚拟仪器我们可以完成在音频范围内的信号采集工作，并设计出在时域、频域上对信号分析的系统。通过具体实验表明：该系统具有双通道、高保真、44.1kHz的采样率，实现了音频信号的实时采集、信号处理（信号的滤波和放大）、信号分析（包含时域和频域）、实时存储等等一系列功能。该系统的拓展性强，由此系统可以推广到语音识别、环境噪声监测、车辆监控、生物医学等多种领域，音频采集系统应用前景广阔。
关键词：信号分析 计算机声卡 数据采集 虚拟仪器 音频采集
Abstract
Compared with traditional audio acquisition cards, this paper uses LabVIEW software and combines computer sound cards to design a convenient and practical audio signal collection and analysis system. Firstly, the basic principle of audio acquisition signal is introduced, and then the hardware structure and working principle of computer sound card are introduced. Signal acquisition is the key to signal analysis and processing. The traditional audio acquisition card has a relatively high price and poor compatibility. From the perspective of design, the computer sound card is a special data acquisition card. It has the advantages of low price, strong practicality and good expansion. And the virtual instrument provides a function of the computer sound card. With the help of the virtual instrument, we can complete the signal acquisition work in the audio range and design a system for signal analysis in the time domain and frequency domain. Through specific experiments, it is shown that the system has a double-channel, high-fidelity, 44.1 kHz sampling rate, and realizes real-time audio signal acquisition, signal processing(signal filtering and amplification), signal analysis(including time and frequency domains), real-time storage, etc.. A series of functions. The system has a strong scalability, from which the system can be extended to speech recognition, environmental noise monitoring, vehicle monitoring, biomedical and other fields, and the application of audio collection system has a wide prospect.
Key words：Signal Analysis Computer Sound Card Data Acquisition Virtual Instrument Audio Acquisition
目录
第1章 绪论 1
1.1研究背景及意义 1
1.2国内外发展情况 1
1.2.1国外发展情况 1
1.2.2国内发展情况 3
1.2.3国内虚拟仪器和声卡采集系统研究现状 3
1.3本文主要研究的内容 4
第2章 虚拟仪器技术简介 5
2.1 虚拟仪器的概念 5
2.2 虚拟仪器特点 5
2.3 虚拟仪器和传统仪器的比较 7
2.4 虚拟仪器控制系统的组成 8
2.5.1 Labview的开发语言 9
2.5.2 图形化虚拟仪器开发平台——LabVIEW 9
2.5.3 基于LabVIEW平台的虚拟仪器程序设计 10
第3章 音频信号采集系统 11
3.1音频信号采集系统的结构 11
3.1.1 数据采集系统概述 11
3.1.2音频信号采集系统的总体框图 11
3.2声卡的介绍 12
3.2.1声卡的硬件结构 12
3.2.2声卡的参数设置 12
3.2.3声卡的工作原理 13
3.3基于Labview的音频采集系统 14
3.3.1 Labview提供的声音函数 14
3.3.2声卡采集系统组成与实现 15
第4章 音频信号分析系统的实现 17
4.1音频信号处理 17
4.2音频信号的滤波 17
4.3音频信号的相位谱与幅度谱 17
4.4音频信号的功率谱 18
4.5音频信号处理后面板 19
第5章 实验数据结果与分析 22
5.1音频信号采集模块 22
5.2信号处理分析模块 23
第6章 总结 24
参考文献 25
致谢 27 |
