A DFT-based front-end for word recognition systems

Combining a custom LSI chip-set for DFT computation and user-programmable signal processors a versatile front-end for word recognition systems has been set up. Depending on the complexity of the required processing algorithms up to four signal processors can be employed in a pipelined architecture. The Multibus-compatible board performs functions like spectral analysis, spectral smoothing, intensity normalisation, and filter bank realisation on speech signals sampled at rates of up to 8 kHz.