一种有限精度HRTF滤波器的高效实现方法  

An efficient implementation of finite precision filter for HRTF

作　　者：金蓉[1] 朱广信 

机构地区：[1]浙江工商大学信息与电子工程学院,浙江杭州310018 [2]杭州中威电子股份有限公司,浙江杭州310012

出　　处：《电路与系统学报》2012年第2期106-110,共5页Journal of Circuits and Systems

摘　　要：针对HRTF(Head Related Transfer Function,头相关传输函数)滤波器硬件实现时产生的FWL(Finite WordLength,有限字长)效应问题,提出了一种HRTF滤波器的高效实现方法。这种方法采用一种新的YWB(Yule-Walker+Balance Model Truncation)算法实现降阶,应用正规实现对抗FWL效应,并应用矩阵的Schur分解达到结构稀疏化。仿真结果说明了YWB算法显著的降阶效果,并说明了这种高效实现方法不仅能对抗FWL效应,而且大大降低了实现复杂度。According the FWL （finite word length） effects produced by the digital device of HRTF digital filter implementation, an efficient implementation of finite precision filter for HRTF is proposed. A new method called YWB （Yule-Walker ＋ Balance Model Truncation） is used to reduce system order, normal realization is used to reduce the FWL effects, and Schur decomposition is used to reduce the implementation complexity. Simulations are presented to demonstrate that YWB has the superior order reduction effect, and that the efficient implementation not only can be effective against the FWL effects, but also can reduce the implementation complexity significantly.

关 键 词：数字滤波器 有限字长效应 降阶 正规实现 

分 类 号：TN911.72[电子电信—通信与信息系统]