Spectral widening of the excitation signal for telephone-band speech enhancement
Ulrich Kornagel · 2001
In current telephone systems the speech to be transmitted is band-limited. The resulting speech quality degradation can be reduced by supplementing the missing spectral components of an enlarged frequency band in an artificial way. One important component of an enhancement system is the wide-band synthesis-filter that has to be driven with a wide-band excitation signal. The focus of this paper is to propose different methods to generate this wide-band excitation signal from a telephone-band limited version.