基于声卡的虚拟仪器在工程信号处理教学中的应用

声卡是计算机的基本配置之一,价格低廉,使用方便;Delphi编程具有较强的灵活性;Matlab具有强大的数据分析和数据处理能力。通过声卡采集数据,利用Matlab分析处理信号,最后通过Delphi设计面板显示信号和分析结果,结合三者的优势可开发出人机界面友好,操作简便,功能强大,成本低廉的教学型虚拟仪器,轻松实现信号采集,信号处理等功能。利用虚拟仪器辅助教学能够有效提高学生的动手实践能力,对学生加深理解信号处理知识有很大帮助。

As one of the basic components of computer, sound card is advantageous for its lower cost and easyusage. Delphi programming is of stronger flexibility and Matlab has strong capacity for data analysis and data pro-cessing. By combining the advantages of the three parts after collecting data via sound card, analyzing and process-ing signal by Matlab, and displaying signal and analysis results through Delphi design panel, it can develop ateaching-type virtual instrument which is low-cost, and simple to control with a user-friendly human-computer in-terface and powerful functions. It is easy to perform functions such as signal collection and signal processing. Theteaching-type virtual instrument can be used to effectively improve students＂ practical abilities and enhance theirunderstanding on signal processing.