摘要：研究一种新的小波收缩阈值函数用于信号的去噪分析，对比分析了硬阈值、软阈值和新收缩阈值函数的优缺点，给出了收缩阈值函数法中的阈值计算详细过程，基于虚拟仪器LabVIEW构建检测齿轮箱系统的振动与噪音检测系统，在MATLAB平台上利用收缩阈值方法开发了对齿轮箱振动和噪声信号进行去噪处理的软件，试验数据的分析表明：基于新的小波阈值函数的信号降噪分析方法去噪效果明显，且保留了原始信号的细节特征，是一种较传统经典去噪手段更为优越的方法，具有较高的实用价值。

Abstract：A new adaptive thresholding function used to denoise signals is studied. The construction of the new thresholding function is illustrated in detail, and the advantages and handicaps of the new method comparing with the hard and soft thresholding function is given. The measurement system based on visual instrument LabVIEW and Matlab used to acquire and analysis the vibration signals of gear case is built. The experimental results shows that the denoising method using the new adaptive thresholding function is valid, which can obtain the main characteristic of original signals and has superior features over conventional methods, possess certain practical value.