Patent ID: 6173256
Filing Date: 2001-01-09
Classification: G10L

Abstract:
A method comprising:receiving a sequence of speech segments that are coded according to an LPC principle;reproducing said segments for in audio reproduction, wherein said reproducing step includes,exciting an all-pole filter with recurrent signals in case of voiced speech, andexciting the all-pole filter with white noise in case of unvoiced speech;wherein said recurrent signals are represented by a series of periodic signals, that said recurrent signals are supplemented by noise from a source for filtering through an amended LPC filter derived from the LPC-filter by using information of pitch, the amended LPC filter characteristics are determined using at least a subset of the four quantities Global Noise Scaling, Pitch Dependent Noise Scaling, Amplitude Dependent Noise Scaling, and Inter-Formant Noise Scaling of a signal.