The speech recognition system was capable of recognizing four commands and could cycle through a simple play list of three songs. The jukebox could turn itself on, begin play, move between tracks, and stop play all through user voice commands. In order to implement this design, Robbins and Saha needed to combine several different hardware and software elements. A small microphone was purchased and used to convert the human voice signal into a voltage signal. This alternating voltage signal was amplified by 1,000 times using three LM358 operational amplifiers. Hardware frequency filters were used to limit the frequency input and software frequency filters were used to parse the signal into different frequency regions.