| Traditional equipment could not meet the demand of modern engineering detection and parametric analysis, since there are many disadvantages in traditional equipment used for signal detecting and analysis, such as single performance, high ratio of cost performance, complexity of detection system etc. The technique of the rapid development of computer provided a necessary technical condition for realize multifunctional digitized detecting analysis using ordinary computer. Especially recently several years National instruments Company put forward a concept of "Computer Virtual Instrument System" It has gradually become the developing orientation of the modern detecting analysis. In view of the viewpoint above, the emphasis of this thesis was exploited a set of virtual instrument system used for signal detection and analysis. It would have the advantages as follows: started off practical application, based on the general computer system, integrated with the functions of many traditional instruments into one, convenient use, strong function, low cost, etc. Firstly, this thesis had a discussion on the overall design of the analog signal processing system. Then it put forward many things as follows: the global practical goal of the system, the concrete function what each managing link should be accomplishment, the arrangement of the operating interface surface and the structure of main class. It expounded the overall process of the system design during not only described how to deal with and analysis the set-up procedure of coticerned mathematical model but also analyzed how to set up data structure and algorithm. In this discussion, new opinion was purposed in how to deal with some climacteric questions. l)The concept of signal data field was purposed in this thesis. A field data was once continuous sampling signal data series. The data in one field have the same sampling parameter. It accomplished the operation about browse and storage the multi-field data in one time 2)Multithreading technique was used in the sampling process. It accomplished concurrent process of sampling and observation. 3)Omni-bearing browse and operation of the sampling curves were accomplished, the curves in the display area could be translated, zoom, selected, etc. In the process of browse, the measure and the scaling were also accomplished. 4)The computer algorithm of multi-channel independent multi-point scaling was put forward. 5)The. fitting result of transfer function was checked up by used of the system simulation calculation. It made user to check up the grade of the fitting directly. 6)Sarne calculation processing of the curves were accomplished, etc. The methods of the accomplishment of these functions have sure referenced value to the design of the similar system. In the expounding of the sampling for random discrete system signal and the design for processing system, not only the sampling of jump signal and the methods of the display and the storage were proposed, but also the method of usual processing analysis and the accomplishment of the computer were discussed. The laboratory test and the practical exercise indicate that it meet the demand of design, it has advantages such as credible system operation, correct result of processing and analysis. Except for accomplished general function, it could be used for some special purpose, such as sampling of instantaneous condition, event count, etc. This system was based on WINDOWS9X, adopted the method of object-oriented programming to describe the...
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