High-quality time stretch and pitch shift effects for speech and audio using the instantaneous harmonic analysis

Authors:
Elias Azarov;Alexander Petrovsky;Marek Parfieniuk
Affiliations:
Department of Computer Engineering, Belarussian State University of Informatics and Radioelectronics, Minsk, Belarus;Department of Computer Engineering, Belarussian State University of Informatics and Radioelectronics, Minsk, Belarus and Department of Real-Time Systems, Bialystok University of Technology, Bialys ...;Department of Real-Time Systems, Bialystok University of Technology, Bialystok, Poland
Venue:
EURASIP Journal on Advances in Signal Processing - Special issue on digital audio effects
Year:
2010

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Abstract

The paper presents methods for instantaneous harmonic analysis with application to high-quality pitch, timbre, and time-scale modifications. The analysis technique is based on narrow-band filtering using special analysis filters with frequency-modulated impulse response. The main advantages of the technique are high accuracy of harmonic parameters estimation and adequate harmonic/noise separation that allow implementing audio and speech effects with low level of audible artifacts. Time stretch and pitch shift effects are considered as primary application in the paper.