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随着计算机技术的不断发展和DSP(数字信号处理)技术不断走向成熟,声卡作为PC机和便携式计算机中基本配置设备,已经成为一种高性价比的音频信号采集输出系统,它同时具有A/D和D/A转换功能,不仅价格低廉,而且兼容性好、性能稳定、灵活通用,非常适合作为虚拟仿真实验系统的首选采集设备。本文利用声卡DSP技术和LabVIEW编程软件,提出了一种基于声卡的数据采集与分析的设计方案,用声卡代替一般的数据采集卡,在LabVIEW环境中实现了数据采集、信号分析(时域分析和频域分析)及信号存储回放等多种功能。利用本系统的各功能模块对实际采集到的信号数据进行分析,得到了试验分析结果,获得较满意的效果。
With the continuous development of computer technology and DSP (Digital Signal Processing) technology continue to mature, as the basic configuration of PC and portable computer sound card has become a cost-effective audio signal acquisition output system, which also has A / D And D / A conversion function, not only inexpensive, but also good compatibility, stable performance, flexible and versatile, ideal for virtual simulation system as the preferred acquisition equipment. In this paper, using sound card DSP technology and LabVIEW programming software, a design scheme of data acquisition and analysis based on sound card is proposed. Using sound card instead of general data acquisition card, data acquisition and signal analysis are realized in LabVIEW environment (time domain analysis and Frequency domain analysis) and signal storage and playback and other functions. Utilize each function module of this system to analyze the signal data actually collected, get the test analysis result, obtain more satisfactory result.