Usb 2.0 And Dsp-based Data Acquisition And Processing System

The development of modern data acquisition teachnology is very quick, many data acqu- isition systems which adopt ISA or PCI technique are quite mature, but they have some defects such as complex,expensive, unexpanded,electromagnetism disturb etc.USB bus is a new kind of seial communication standard which is provided by INTEL,NEC , MICROSOFT,IBM etc. to solve the defect of traditional bus in 1995 .In order to adapt the high-speed transmission, these companies establish the USB2.0 transmission protocol in April 2004, which is based on the USB 1.1, it makes its speed to reach 480Mb/s.The bus has some virtues such as convenient installation, high bandwidth, easily expanded and so on,so it has been become a developing trend of modern data acquisition transmission gradually.With the high speed development of Information and Computer Technology, Digital Signal Process technology has been a very key science gradually.The appearance of DSP provides a possibility for realization of the digital signal process arithmatic .And DSP, this kind of chip having a special architecture for FFT arithmatic, helps us to process some digital signals.Based on USB2.0 and DSP technologies,the paper designs a high-speed data acquisition and processing system.It discusses USB protocol and each function module detailed.The hard-ware consists of input passage module,acquisition and processing module and computer interface module.The sofeware design of the syetem is composed of the fireware ,the device driver and the host application program. The hardware system picks DSP as the core processor. Through AD conversion, the collected data are passed to the DSP for further mathematic transaction, then, the transacted data are directed to host computer via USB interface.