A Wavelet-based Pitch-shifting Method

Abstract

Abstract — In audio engineering, Pitch shifting is a term to describe the process of changing the pitch of an audio signal (which is related to the logarithm of the frequency), but opposite to resampling, pitch shifting retains the duration of the original signal. This process is very useful for example in correcting slightly out-of-tune singers or instruments. The dual problem is changing the signal duration without affecting its pitch; this is called time stretching. One of the most well-known techniques for performing pitch shifting is called Phase Vocoding, but this method presents some artifacts. This project aims to overcome some of the deficiencies of the Phase Vocoder by using a waveletbased approach. Index Terms — Pitch shift, vocoder, phase vocoder, wavelet, Morle