基于虚拟仪器声音采集系统设计机电子毕业设计论文.doc

毕业设计（论文） 题 目 基于虚拟仪器的声音采集系统设计  摘 要 声音信号充斥着我们的生活，它在各个领域都有着非常重要的应用，包括医学、教育、军事、机械加工等领域。现在的声音分析测试系统主要以传统的仪器为主，但是传统仪器存在很多缺点：开发周期长，成本高，功能固定，升级换代很不方便，已经越来越不能满足使用者的要求。 本文简要的介绍了一种基于labview的虚拟声音信号采集分析系统，它很好的解决了传统仪器存在的弊端，不仅开发成本低，构建精度高，功能也非常的灵活，还可以根据用户的需要进行自定义，为实现声音信号的采集分析提供了一种新的途径。 在整个系统的设计上，结合声音信号分析的功能需求和labview的设计方法，从硬件和软件两个方面来进行整个系统的设计。其中最重要的就是传感器的选择，在保证可靠性和可行性的前提下，用计算机本身自带的声卡来代替传统的数据采集卡进行声音信号的采集，可以实现44.1KHz的采样频率，以及16位的采样位数，并且可以选择单通道和双通道。然后在labview平台上完成信号分析的软件部分，实现声音的采集，回放，以及分析。声音的分析包括声音信号瞬态特征的提取，滤波，频谱分析，功率分析，谐波失真分析。 系统经过测试，满足了声音信号分析的需求，价格低廉，功能灵活，升级方便，通用性好。可以应用到振动声音，语音信号等信号的检测分析中，还可以应用在声音信号的科研工作中，以及虚拟仪器的教学中，可以说它的应用前景非常广阔。 关键词：声音信号，虚拟仪器，labview，声卡采集  Abstract Sound signal is full of our life, it in various fields have very important applications, including medicine, education, military, machinery processing and other fields. Now the voice analysis test system is mainly to the traditional instrument, but traditional instruments exist many shortcomings: development cycle is long, high cost, fixed function, the upgrade is not convenient, has become increasingly unable to meet the users requirements. This paper briefly introduces a kind of analysis system based on labview virtual sound signal acquisition. It well solves the disadvantages existing in the traditional instruments, not only low cost of development, construct a high accuracy, function is also very flexible, can also customize according to the needs of users, provides a new way to realize the voice signal acquisition and analysis. In the design of the whole system, combined with the design method of voice signal analysis of functional requirements and labview, from two aspects of hardware and software design of the whole system. The most important is the choice of sensor, under the precondition of ensuring the reliability and feasibility, with a total count machine comes with its own sound card to replace the traditional data acquisition card for sound signal acquisition, can achieve 44.1 kH