The key technique and its application of virtual instrument based on sound card

摘要

Based on sound card in computer, the developing principles and the key techniques of virtual instrument (Ⅵ) are discussed in this paper. Then, some examples in engineering geophysics show that the technique is advanced and practical one. In addition, theory and many examples indicate that the virtual instrument represents the developing trend of modern instruments, that is: "the software is the instrument." The future instruments will have more excellent performance and will be applied in wider range of application.