文档介绍：虚拟仪器设计-数据采集系统
摘要
虚拟仪器由通用仪器硬件平台(简称硬件平台)和应用软件两大部分构成。硬件平台主要完成对被测信号的进行调理和采集。仪器硬件可以是插入式数据采集卡及必要的外围电路(含信号调理电路、A/D转换器、数字I/O、定时器、D/A转换器等),或者是带标准总线接口的仪器,如GPIB、VXI、PXI、STD、PCI总线仪器和网络化仪器等。
目前市场上的A/D采集卡和数据采集卡以及带标准总线接口的仪器等,其价格均不菲,以毕业设计的目的来说,性价比以及实用程度显的不高。
进而考虑到计算机中的声卡本身就是一个A/D,D/A的转化装置,具有16位的量化精度、,完成可以满足特定应用范围内数据采集的需要,个别性能指标还优于商用数据采集卡,而价格却为商用数据采集卡的十分之一或者几十分之一,在设计实验中完全可以满足要求。
因此在本设计中,数据采集装置主要基于声卡和labview模拟数据采集。利用声卡实现对数据的采集,制作成一个简易的数据采集系统,能够实现数据采集、模拟采集数据、波形显示、进行低频滤波四大功能。
关键词:虚拟仪器;数据采集;声卡
Virtual Instrument Design - Data Acquisition System
Abstract
Virtual Instrument by the General Instrument hardware platform (the hardware platform) and consisted of two major applications. The main hardware platform plete the conduct of the measured signal conditioning and acquisition. Hardware equipment can be a plug-in data acquisition card and the necessary peripheral circuits (including the signal conditioning circuits, A / D converter, digital I / O, timer, D / A converters, etc.), or with the standard bus interface equipment, such as GPIB, VXI, PXI, STD, PCI bus devices work equipment and so on.
Currently on the market A / D acquisition card and data acquisition cards, as well as the standard bus interface with the equipment, their prices are expensive to design for the purposes of graduation, as well as the usefulness of the significant cost of not very high.
To take into account puter's sound card itself is an A / D, D / A conversion devices, with 16-bit quantization precision, data acquisition frequency is , completed within the scope of application to meet the specific needs of data collection, individual also better than mercial performance data acquisition card, and the price mercial data acquisition card for one-tenth or a few one-tenth of the experiment in the design to meet the pletely.
Therefore, in this design, data acquisition device is mainly based on the sound card and analog data acquisition labview. The use of sound to achieve the data collect