DocumentCode :
1578392
Title :
Blind separation of linear convolutive mixtures through parallel stochastic optimization
Author :
Cohen, Marc ; Cauwenberghs, Gert
Author_Institution :
Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA
Volume :
3
fYear :
1998
Firstpage :
17
Abstract :
We apply stochastic parallel optimization techniques to on-line blind separation of linear convolutive mixtures of independent time-varying signals. The optimization performs stochastic gradient descent on a scalar measure of statistical independence observed directly on the outputs of the unmixing network, which contains a matrix of finite impulse response (FIR) filters. We derive on-line adaptation rules, and a scalable modular architecture with minimum memory requirements amenable to parallel VLSI implementation. The architecture implements a slight modification of the network adaptation rule, which omits symmetrical non-causal terms in the computation of the stochastic gradient. Simulations indicate near-perfect separation using both versions of the rule, with a minimum phase response resulting from the simplified version
Keywords :
FIR filters; VLSI; adaptive signal processing; analogue processing circuits; convolution; filtering theory; optimisation; parallel architectures; real-time systems; stochastic processes; time-varying systems; FIR filter matrix; finite impulse response filters; independent time-varying signals; linear convolutive mixtures; minimum memory requirements; minimum phase response; online adaptation rules; online blind separation; parallel VLSI implementation; scalable modular architecture; statistical independence; stochastic gradient; stochastic gradient descent; stochastic parallel optimization; symmetrical noncausal terms omission; Computer architecture; Computer networks; Finite impulse response filter; Independent component analysis; Memory architecture; Performance evaluation; Sensor arrays; Stochastic processes; Symmetric matrices; Very large scale integration;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
Type :
conf
DOI :
10.1109/ISCAS.1998.703882
Filename :
703882
Link To Document :
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