Design and implementation of digital filters for audio signal processing

An analog active filter do not provide a very sharp cut-off for both higher and lower frequency component, while a digital signal processor (DSP) using digital filter effectively reduces the unwanted higher or lower order frequency components within an audio signal. In this paper, we present the design and implementation of digital filters for audio signal. Experimental results show that digital filters including low-pass, high-pass, and band-pass effectively eliminate both low and high frequency components contained in human voice, providing high quality voice.