Interspeech'2005 - Eurospeech

Lisbon, Portugal
September 4-8, 2005

Speech Bandwidth Extension by Improved Codebook Mapping Towards Increased Phonetic Classification

Rongqiang Hu, Venkatesh Krishnan, David V. Anderson

Georgia Institute of Technology, Atlanta, GA, USA

Bandwidth limitation (0-4KHz) is a major degradation for the performance of the current speech communication systems. The narrowband speech provides much lower quality and intelligibility than wideband speech (0-8KHz). Speech bandwidth extension technology has been recently investigated to aim at artificially regenerating the missing high-band speech signal. This paper describes a robust speech bandwidth extension system by an improved codebook mapping method (CM-IPC), which includes a modified codebook training towards increased phonetic classification, marginal LSF interpolation, codebook mapping with memory, and codebook interpolation. A variety of experiments, in clean and noisy environments, were conducted to evaluate the performance of the proposed system. The results indicate the improvement in objective quality measures. The proposed system can also be applied to the feature extension estimation of speech signals.

Full Paper

Bibliographic reference.  Hu, Rongqiang / Krishnan, Venkatesh / Anderson, David V. (2005): "Speech bandwidth extension by improved codebook mapping towards increased phonetic classification", In INTERSPEECH-2005, 1501-1504.