Distortion of voicing and vocal tract parameters after codecs

Authors:
Amr Nabil;M. Hesham
Affiliations:
Engineering Mathematics and Physics Dept., Faculty of Engineering, Cairo University, Giza, Egypt;Engineering Mathematics and Physics Dept., Faculty of Engineering, Cairo University, Giza, Egypt
Venue:
CSECS'09 Proceedings of the 8th WSEAS International Conference on Circuits, systems, electronics, control & signal processing
Year:
2009

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Abstract

In this work, we present results on the effect of well-known mixed excitation linear prediction (MELP) and code-excited linear prediction (CELP) codecs (coder/decoder) on voicing and vocal tract parameters of Arabic sounds. The study shows that the spectral distortion is large compared to other studies and is largest for MELP1200. Vowel formants have a shift which may exceed one critical band below or above its reference value. Finally, it was found that the coded pitch period did not suffer any significant change through the coding/decoding process.