Abstract
At present the market data acquisition card contains a complete data acquisition circuits and computer interface circuits, but its price and performance is directly proportional to the basic, general more expensive. With the DSP (digital signal processing) technology to mature, PC sound card itself into an outstanding data acquisition system.
The internship is mainly using computer sound card as a substitute ordinary acquisition hardware, Use data analysis and processing functions very powerful LabVIEW software works as a software development platform, design a high sampling accuracy, the middle-sampling frequency, flexibility, good sound data acquisition system。In LabVIEW environment to achieve the audio signal acquisition and analysis and data archiving And has a high accuracy rate of acquisition，Acquisition to the small signal distortion，is not comparable to data acquisition card. A simple, user-friendly, stable and reliable performance , and many other advantages. Computer sound card configuration can block more than a real-time, high signal to noise ratio of multi-channel data acquisition system. In speech recognition, environmental noise monitoring and laboratory measurements in the field such as has broad prospects. Acquisition Software generated interactive, and easy to operate, and can be carried out according to the user's needs expand function for the construction of low-cost data acquisition system provides an idea.
Key words: Virtual Instronmention 、 Sound card 、 Data acquisition 、 Signal analysis Mulfithreading
