### Abstract

Physical modelling of musical instruments is one possible
approach to digital sound synthesis techniques. By the term
physical modelling, we refer to the simulation of sound
production mechanism of a musical instrument, which is modelled with reference to the physics using wave-guides. One of the fundamental parameters of such a physical model is the pitch, and so pitch period estimation is one of the first tasks of any analysis of such a model.
In this paper, an algorithm based on the Dyadic Wavelet
Transform has been investigated for pitch detection of musical signals. The wavelet transform is simply the convolution of a signal f(t) with a dialated and translated version of a single function called the mother wavelet that has to satisfy certain requirements. There are a wide variety of possible wavelets, but not all are appropriate for pitch detection. The performance of both linear phase wavelets (Haar, Morlet, and the spline wavelet) and minimum phase wavelets (Daubechies’ wavelets) have been investigated. The algorithm proposed here has proved to be
simple, accurate, and robust to noise; it also has the potential of acceptable speed. A comparative study between this algorithm and the well-known autocorrelation function is also given. Finally, illustrative examples of different real guitar tones and other sound signals are given using the proposed algorithm.

Original language | English |
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Title of host publication | Proceedings of 2nd COST-G6 Workshop on Digital Audio Effects (DAFx99) |

Editors | J Tro, M Larsson |

Place of Publication | Trondheim |

Publisher | Norwegian University of Science and Technology |

Pages | 101-104 |

Number of pages | 4 |

Publication status | Published - 1999 |

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## Cite this

Fitch, J., & Shabana, W. (1999). A wavelet-based pitch detector for musical signals. In J. Tro, & M. Larsson (Eds.),

*Proceedings of 2nd COST-G6 Workshop on Digital Audio Effects (DAFx99)*(pp. 101-104). Norwegian University of Science and Technology.