Title :
A study on controllability of IIR ADF with parallel connected biquads
Author :
Takumi, Ichi ; Kata, M.
Author_Institution :
Dept. Electr. & Comput. Eng., Nagoya Inst. of Technol., Japan
Abstract :
The authors propose a method of pole control of infinite impulse response (IIR) adaptive digital filters (ADFs) and show its pole controllability with trajectories of poles on the MSE (mean square error) surface. The proposed IIR ADF consists of a finite impulse response (FIR) part and an IIR part. The FIR part identifies flat delay and responses of the echo which comes from poles near the origin of the z-plane. The IIR part identifies echo responses that are long lasting owing to poles near the unit circle of the z-plane. The IIR part consists of several second-order IIR filters connected in parallel. The filter sections are able to operate independently. This type of IIR ADF has no stability problem in controlling the pole location, since the ADF consists of stable biquad sections or second-order IIR sections. Simulation results show that the proposed IIR ADF has excellent pole controllability
Keywords :
adaptive filters; controllability; digital filters; filtering and prediction theory; poles and zeros; FIR section; adaptive digital filters; controllability; finite impulse response; infinite impulse response; mean square error; parallel connected biquads; pole control; second-order IIR filters; stable biquad sections; Adaptive control; Bandwidth; Controllability; Delay; Digital filters; Finite impulse response filter; IIR filters; Programmable control; Stability; Transversal filters;
Conference_Titel :
Circuits and Systems, 1991., Proceedings of the 34th Midwest Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-0620-1
DOI :
10.1109/MWSCAS.1991.252056
