小数采样率转换中的μ-发生器设计  

Design of μ-Generator in Decimal Sample Rate Conversion

作　　者：周金元[1] 王琳凯[1] 汪文义[1] 周晓方[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海201203

出　　处：《计算机工程》2011年第19期218-220,共3页Computer Engineering

基　　金：国家自然科学基金资助项目(60876016);专用集成电路与系统国家重点实验室基金资助项目(ZD20080103;09ZD002)

摘　　要：分析应用于小数采样率转换的滤波器结构,得出改进的Farrow滤波器结构和转置Farrow滤波器结构分别适用于升采样和降采样。在此基础上,设计一种通用于这2种滤波器结构的μ-发生器,通过定期校正量化误差避免μ值产生线性飘移现象。仿真结果验证该μ-发生器设计的可行性和有效性,相比传统μ-发生器,其计算复杂度更低、功耗开销更小。This paper analyzes modified Farrow and modified transposed Farrow structure,and comes to a conclusion that modified Farrow structure is proper to up sampling while modified transposed Farrow structure is proper to down sampling.Based on above this paper proposes a method of designing low complexity μ-Generator which is used in fractional sample rate conversion.This method corrects the error periodically to avoid the drift of μ which caused by quantification error.Simulation result verifies the validity and feasibility of the design,shows its has lower complexity,and smaller power consumption cost than traditional μ-Generator.

关 键 词：Farrow滤波器 小数采样率转换 小数间隔 量化误差 线性相位 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]