Time-delay radial basis functions in silicon for phoneme recognition

This paper presents the implementation of a time-delay radial basis function (TD-RBF) neural network (NN) using three VLSI neural network systems. 1) A chip for implementing self-organising maps; 2) a radial basis function chip 3. A back-propagation learning chip; 3) the first chip was implemented using mixed mode technology, while the other two chips used analogue technology. The chips have been fabricated and a TD-RBF NN been applied successfully to the task of phoneme recognition. Analogue technology has been adopted mainly in order to attain the high processing speeds that analogue neural networks can acquire. Analogue technology also provides the benefit of designs with reduced power dissipation, low voltage operation and lower area cost.