The comparison of window functions for different subbands in Phase Vocoder

DOI

10.2991/icmt-13.2013.179How to use a DOI?

Keywords

Phase vocoder; windowing; MP3; SVM.

Abstract

The phase vocoder[1] has long been a well established tool in pitch shifting technology. It analyzes and synthesizes audio signal via short-time Fourier Transform. Unfortunately, Fourier Transform leads to the inevitable inherent frequency leakage which decreases the accuracy of the pitch shifting effect [2]. In order to restrain this side effect, window functions are used to intercept audio. Hamming Window, Hanning Window, Blackman Window and Kaiser Window are well known windows used in digital technology [3][4]. This paper compares the effect of the four windows in restraint of frequency leakage and maintaining the audio quality after pitch shifting. Based on the MP3 encoding principle, we divide the human hearing frequency range 20Hz-20K Hz [5] into 32 equal width subbands. Then, for each sub-band, four window functions are separately used to intercept sound [6]. Moreover, the SVM method is introduced to classify suitable and unsuitable window for each subband. Finally, we conclude the suitable frequency scale for each of the four window functions.

Copyright

© 2013, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Bin Xiao
AU  - Yi Jiang
PY  - 2013/11
DA  - 2013/11
TI  - The comparison of window functions for different subbands in Phase Vocoder
BT  - Proceedings of 3rd International Conference on Multimedia Technology(ICMT-13)
PB  - Atlantis Press
SP  - 1458
EP  - 1465
SN  - 1951-6851
UR  - https://doi.org/10.2991/icmt-13.2013.179
DO  - 10.2991/icmt-13.2013.179
ID  - Xiao2013/11
ER  -