Title :
A new IIR adaptive echo canceler: GIVE
Author :
Chao, Jinhui ; Kawabe, Shinobu ; Tsujii, Shigeo
Author_Institution :
Dept. of Electr. & Electron. Eng., Chuo Univ., Tokyo, Japan
fDate :
12/1/1994 12:00:00 AM
Abstract :
A novel IIR adaptive gradient instrumental variable echo canceler (GIVE) is presented. Its features include adaptive controllability during double-talk periods in acoustic conference systems; guarantee of global convergence; low computational cost (the same order as the IIR LMS algorithm of the equation error method); and flexible structures (parallel or series-parallel structures). We also show a convergence analysis for gradient adaptive algorithms including GIVE. Based on this analysis, the optimum stepsize for GIVE and three suboptimum algorithms are proposed to accelerate convergence and reduce misadjustment. In addition, a simple method that guarantees the stability of IIR filters and a configuration of GIVE applicable to closed loop systems are presented. These proposals are extensively studied by computer simulations
Keywords :
IIR filters; adaptive filters; adaptive signal processing; closed loop systems; convergence of numerical methods; echo suppression; filtering theory; IIR adaptive echo canceler; IIR filters stability; acoustic conference systems; closed loop systems; computer simulations; convergence analysis; double-talk periods; global convergence; gradient adaptive algorithms; gradient instrumental variable echo canceler; low computational cost; optimum stepsize; series-parallel structure; suboptimum algorithms; Adaptive control; Algorithm design and analysis; Computational efficiency; Controllability; Convergence; Equations; Error correction; Instruments; Least squares approximation; Programmable control;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
