A multi-input current-mode fuzzy integrated circuit for pattern recognition

The multi-input current-mode fuzzy recognition integrated circuit proposed can accept multiple inputs that represent multiple features of an unknown pattern in time-sharing way. The principle of the fuzzy circuit is based on the "sum sorting" rule. In the fuzzy circuit, the membership function generator employs current-mode circuit to generate memberships corresponding to each standard pattern according to the input features. Switched current accumulators are adopted to realize the sum function for synthetic memberships. The sorting circuit sorts all the synthetic memberships based on their magnitudes, and finally recognition results are outputted. The fuzzy integrated circuit has been successfully manufactured in 2 /spl mu/m N-well standard digital CMOS process. It has been applied to speaker-independent Chinese digits speech recognition with high recognition speed of 1.7/spl times/10/sup 5/ digits per second.