A new light is thrown on the Portnoff [1] speech signal time-scale modification algorithm. It is shown in particular that the Portnoff algorithm easily accommodates expansion factors bigger than 2 without causing reverberation nor chorusing. The modified Portnoff algorithm, which draws on spectral modification techniques due to Seneff [2], has been tested on several speech signals. The quality of the synthesized signal is totally satisfactory even for big expansion factors. The article gives a brief summary of the Portnoff algorithm and spells out the modifications introduced. It is shown that the phase unwrapping procedure constitutes a crucial point of the algorithm.
Cite as: Martino, J.D. (1997) Speech synthesis using phase vocoder techniques. Proc. 5th European Conference on Speech Communication and Technology (Eurospeech 1997), 1635-1638, doi: 10.21437/Eurospeech.1997-467
@inproceedings{martino97_eurospeech,
author={Joseph Di Martino},
title={{Speech synthesis using phase vocoder techniques}},
year=1997,
booktitle={Proc. 5th European Conference on Speech Communication and Technology (Eurospeech 1997)},
pages={1635--1638},
doi={10.21437/Eurospeech.1997-467}
}