Telephone speech is typically bandlimited to 4 kHz, resulting in a 'muffled' quality. Coding speech with bandwidth greater than 4 kHz reduces this distortion, but requires a higher bit rate to avoid other types of distortion. An alternative to coding wider bandwidth speech is to exploit correlation between the 0-4 kHz and 4-8 kHz speech bands to re-synthesize wideband speech from narrowband speech. This paper presents a method for re-synthesizing narrowband coded speech using sinusoidal transform coding (STC), modified codebook mapping and a novel method for the synthesis of highband unvoiced components. Informal listening test results indicate that this method produces a significant quality improvement in speech which has been coded using narrowband standards.
Cite as: Epps, J., Holmes, W.H. (1998) Speech enhancement using STC-based bandwidth extension. Proc. 5th International Conference on Spoken Language Processing (ICSLP 1998), paper 0711, doi: 10.21437/ICSLP.1998-378
@inproceedings{epps98_icslp,
author={Julien Epps and W. Harvey Holmes},
title={{Speech enhancement using STC-based bandwidth extension}},
year=1998,
booktitle={Proc. 5th International Conference on Spoken Language Processing (ICSLP 1998)},
pages={paper 0711},
doi={10.21437/ICSLP.1998-378}
}