| This paper is generated from a design and research of virtual oscilloscope based on Universal Serial Bus(USB) interface, the author do the research of the problem of data acquisition system's data transferring in USB . At first, the author gives out the trend and actuality of the data acquisition that use the USB interface. After comparing several conventional data transfer methods and new pattens generated in recent years, the advantages and disadvantages of USB interface used in data transfer and virtual measure system are introduced. Secondly, the data transfer protocol and USB device's structure is described briefly. By introducing the detailed principle of Virtual Digital System Oscilloscope, the implement of the high-speed data acquisition has been discussed. Thirdly, the author uses the dynamic link library (dll) to connect the device and the computer. At last, the disadvantages are discussed and the improving advices are given. |
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