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A Hybrid Time and Frequency Domain Audio Pitch Shifting Algorithm

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This paper presents an abstract algorithm that performs audio pitch shifting as a combination of a signal analysis, a filter bank and frequency shifting operations. Then, it is shown that two previously proposed pitch shifting techniques are actually concrete implementations of the presented abstract algorithm. One of them is implemented in the frequency domain whereas the other is implemented in the time domain. Based on an analysis and comparison of the properties of these two techniques (quality, artifacts, assumptions on the signal), we propose a new hybrid implementation working partially in the frequency domain and partially in the time domain, and achieving superior quality by taking the best from each of the two existing techniques.

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