A novel speech recognition system-on-chip

This paper introduces a novel isolated word speech recognition system-on-chip (SoC). An Application Specific Integrated Circuit (ASIC) with a unique vector accelerator is designed in the SoC to realize Continuous density Hidden Markov Model (CHMM) recognition algorithm based on the Mel-Frequency Cepstral Coefficients (MFCC) feature. Due to a hardware and software co-design, the cost of the ASIC is similar to a low-cost 8bit micro controller unit (MCU). A two-stage strategy is adopted for recognizing 200-phrase and recognition accuracy rate is about 98%.