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Improving the Phase Vocoder Approach to Pitch-Shifting
KTH, School of Electrical Engineering (EES), Sound and Image Processing.
2007 (English)In: INTERSPEECH 2007: 8TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION ASSOCIATION, VOLS 1-4, 2007, 2760-2763 p.Conference paper, Published paper (Refereed)
Abstract [en]

A class of methods known as phase vocoders allows for implementing pitch shifting in the spectral domain. We extend the approach of shifting the isolated harmonies of the spectrum by introducing a new technique for separating the sinusoidal components. Keeping together the main lobe and the side lobes, which result from convolution of the harmonics with the spectrum of the analysis window in the Fourier transform, we minimize the leakage of energy and the related phase compensation problems. Furthermore, we integrate a robust enhancement to the update of the phase, based on tracking of the energy envelope. The formant structure of the signal is preserved by means of an all-pole speech production model. The proposed modifications lead to significant improvement of the quality of the pitch-shifted speech.

Place, publisher, year, edition, pages
2007. 2760-2763 p.
Keyword [en]
phase vocoder, Gabor transform, pitch shifting, regularized lpc
National Category
Computer Science
Identifiers
URN: urn:nbn:se:kth:diva-36100ISI: 000269998601318Scopus ID: 2-s2.0-56149116527OAI: oai:DiVA.org:kth-36100DiVA: diva2:430591
Conference
Interspeech Conference 2007 Antwerp, BELGIUM, AUG 27-31, 2007
Note
QC 20110711Available from: 2011-07-11 Created: 2011-07-08 Last updated: 2011-07-11Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf