This paper investigates the subjective effects of speech quality impairments resulting from cell loss and coding distortion, which are likely to occur in communications systems using ATM (Asynchronous Transfer Mode). A method is proposed for improving speech quality degraded by cell loss. This method uses an LPC (Linear Predictive Coding) spectrum-shaping filter. The performance of the proposed method is compared with that of a speech signal waveform substitution method. Listening tests were used to assess both quality (defined using a rating scale) and intelligibility. Speech quality evaluation results are presented for various speech coding methods, methods for dividing speech signals into cells, unit cell sizes, and missing-cell-rates. Experimental results show the robustness of embedded coding against cell loss and the effectiveness of the proposed quality-improvement method. Keywords: Speech quality evaluation; ATM; Cell loss
Cite as: Nagabuchi, H., Kitawaki, N. (1991) Evaluation and improvement of coded speech quality degraded by cell loss in ATM networks. Proc. 2nd European Conference on Speech Communication and Technology (Eurospeech 1991), 603-606, doi: 10.21437/Eurospeech.1991-58
@inproceedings{nagabuchi91_eurospeech,
author={Hiromi Nagabuchi and Nobuhiko Kitawaki},
title={{Evaluation and improvement of coded speech quality degraded by cell loss in ATM networks}},
year=1991,
booktitle={Proc. 2nd European Conference on Speech Communication and Technology (Eurospeech 1991)},
pages={603--606},
doi={10.21437/Eurospeech.1991-58}
}