Real time speech recognition using IIR digital filters implemented on an embedded system

Abstract

In this paper we implemented real time speech processing and recognition using Infinite Impulse Response (IIR) digital filters. We used an array of 7 digital bandpass filters to filter out various frequencies and recognize each word by its frequency spectra. The system is implemented on a low cost AVR architecture microcontroller which also explored the use of simple architectures as real time DSP processors. This opens up new vistas for the AVR applications and also provides a low cost solution for small and medium DSP applications.