This paper introduces a harmonic analysis device based on USB, using FPGA to process the harmonic calculation, that has advantages such as high speed, low cost and modularization.

本文设计了一基于USB总线的谐波分析仪，用FPGA芯片进行谐波计算，具有速度快、成本低、模块化等特点。

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Due to the speed limit of USB connection, the resolution (352x288) and colour bit depth that can be captured is low. Hence, the final quality is much poor than the origanl.

可是，就著USB本身传送速度极限，能被捕捉的解像度与及颜色只能有限，因此得出来的影像质素会比原来的差很多。

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Proposed one kind with realizes based on the USB connection's low speed optical mouse's design.

提出了一种基于USB接口的低速光电鼠标的设计与实现。

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