Title :
Adaptive lowpass filters
Author :
Yamaguchi, Kentaro ; Watanabe, Eiji ; Nishihara, Akinori
Author_Institution :
Tokyo Inst. of Technol.
Abstract :
We propose a design of first-order adaptive infinite impulse response (IIR) low-pass filters to find the passband-edge frequencies of low-pass signals: we first show that gradient algorithms cannot directly be applied because the mean square errors (MSE) of IIR low-pass filter outputs have no extremum. Then we introduce a weighting function to be multiplied with the transfer function so that MSE has an extremum. Structures to realize the proposed adaptive low-pass filters are shown. Simulations confirm the convergency of the proposed algorithms
Keywords :
IIR filters; adaptive filters; low-pass filters; adaptive low-pass filters; gradient algorithms; infinite impulse response; low-pass signals; mean square errors; passband-edge frequency; transfer function; weighting function; Acoustic noise; Adaptive filters; Adaptive signal detection; Band pass filters; Bandwidth; Cutoff frequency; IIR filters; Mean square error methods; Stochastic processes; Transfer functions;
Conference_Titel :
Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on
Conference_Location :
Tainan
Print_ISBN :
0-7803-8660-4
DOI :
10.1109/APCCAS.2004.1412810