Today, with the development of science and technology, the requirement measurement technology is getting more and more important. The application electronic measurement technology has extended to more fields than before.the paper design a data acquisition, signal analysis and virtual instrument system based on computer. Introduced the sound card data acquisition system manufacture main point, utilizes the LabVIEW procedure development system, has a Cardin the ordinary equipment on the computer, has realized double channel data acquisition system.
Experiment results prove that the system can acquire signals in the frequency range designed for sound card correctly, and can be applied in the domains of data acquisitions and general analysis. In the range of voice frequency, data saving and overloading is successful in LabVIEW .If more sound cards configured in a PC,it`s feasible to build a muli-channel real-time DAQ system with high SNR.With broad application prospect, this solution can be extended to the field of speech recognition,embient noise monitoring and laboratory measurement etc.
Key words: LabVIEW; Date acquisitions; Sound card; Virtual instrument; Signal analysis