过采样系统中数据抽取的设计及实现  

Design and Implementation of Decimating in the Over-sample System

作　　者：张俊华[1] 张伟[1] 蒲中奇[1] 

机构地区：[1]清华大学机械工程系,100084

出　　处：《国外电子测量技术》2005年第4期34-37,共4页Foreign Electronic Measurement Technology

基　　金：国家自然科学基金项目(50176022)。

摘　　要：由于模拟滤波器设计的限制,几乎所有实际的数据采样中都存在过采样,虽然简化了模拟电路的设计,但却增加了数据处理的难度。为此提出了一种有效减小数据量的抽取方法,给出了其应用及具体算法,考虑了如何避免失真等实现中需要注意的细节,简单介绍了该方法带来的信噪比提高,以及有效采样位数增加等优点。Due to the limitation of analog filters itself, over-sampling almost exists in all sample systems. This make the analog circuit design easy, however, the difficulty in the digital post-processing is increased. Decimation is proposed to resolve this problem. The design and implementation is given in detail including how to avoid distortion. It discussed the advantage such as improving of SN and increasing of ENOB.

关 键 词：过采样系统 数据抽取 数据采集 数字滤波 采样有效位 多重抽取 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]