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Plucked String “ Nothing Else Matters ” using Karplus-Strong Synthesis

With the advent of physical modeling, the implementation of instrument synthesis has become easier. Ironically, the KS algorithm was discovered as a simple computational technique that seemingly had nothing to do with physics [4]. It was Julius Smith and David Jaffe who first realized the potential of the KS algorithm and its relation to the physics of the plucked string. With the KS filter an ordinary impulse response can be turned into what sounds like a plucked string. This project aims to demonstrate the ease of use of the KS filter and how it can be augmented to play a song. The song in question is Metallica’s 1991 Nothing Else Matters. With its beautiful introduction displaying the intricate and romantic nature of the guitar, the song is perfect for KS synthesis. This project will use the knowledge gained in Digital Audio I, particularly Lab 6 that described the basics of KS synthesis in Matlab. To create each guitar note in the song, a noise burst must be filtered through a KS filter which uses the combination of a low pass filter and an allpass filter. Each note must then be put in the proper order in an array. Chords can be made by adding notes together. The result will be the emulation of the rhythm and pitch of the introduction to Nothing Else Matters. The findings imply that KS filtering is an essential part of digital music. In today’s world, string instruments can be synthesized extremely accurately and be used to play any piece. Keywords–digital audio, filter, KarplusStrong, plucked string