In this chapter an introduction on bandwidth extension of telephony speech is given. It is presented why current telephone networks apply a limiting bandpass, what kind of bandpass is used, and what can be done to (re)increase the bandwidth on the receiver side without changing the transmission system. Therefore, several approaches – most of them based on the source-filter model for speech generation – are discussed. The task of bandwidth extension algorithms that make use of this model can be divided into two subtasks: excitation signal extension and wideband envelope estimation. Different methods like non-linear processing, the use of signal and noise generators, or modulation approaches on the one hand and codebook approaches, linear mapping schemes or neural networks on the other hand, are presented.
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Iser, B., Schmidt, G. (2008). Bandwidth Extension of Telephony Speech. In: Hänsler, E., Schmidt, G. (eds) Speech and Audio Processing in Adverse Environments. Signals and Communication Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-70602-1_5
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DOI: https://doi.org/10.1007/978-3-540-70602-1_5
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