Title :
Digital active ear defender
Author :
Jianyong, Li ; Yu, Zhang
Author_Institution :
301 No. 3 Dept., Electron. Eng. Inst., Hefei, China
Abstract :
This paper deals with the design of a digital active ear defender, which has been realized by adaptive control technology based on the principle of acoustical destructive interference. The least mean square (LMS) adaptive filter algorithm has been applied to the active ear defender, where the input or the output of the adaptive filter or the feedback error signal are filtered prior to use in the adaptive algorithm. This system is defined as “filtered” LMS. A frequency domain model of the “filtered” LMS algorithm is presented for analyzing the behavior of the system. Based on it, a method of inserting delays in the reference path is given. The simulations which support the theoretical prediction are presented. The simulations display the system available
Keywords :
acoustic noise; acoustic signal processing; active noise control; adaptive control; adaptive filters; adaptive signal processing; delays; ear; filtering theory; hearing; interference (signal); least mean squares methods; protection; LMS adaptive filter algorithm; acoustical destructive interference; active noise control; adaptive control technology; delays; digital active ear defender; feedback error signal; filtered LMS algorithm; frequency domain mode; least mean square; reference path; simulations; Adaptive algorithm; Adaptive control; Adaptive filters; Algorithm design and analysis; Delay; Ear; Frequency domain analysis; Interference; Least squares approximation; Output feedback;
Conference_Titel :
Signal Processing, 1996., 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-2912-0
DOI :
10.1109/ICSIGP.1996.571260
