G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/14 (2006.01) G10L 11/02 (2006.01) G10L 11/06 (2006.01)
Patent
CA 2188369
Described is a method and an arrangement for classifying speech on the basis of wavelet transformation for low rate speech coding methods. The method or arrangement as a robust classifier of speech signals for the signal-matched control of speech coding methods for lowering the bit rate at a constant speech quality, or to increase the quality for an identical bit rate is characterized in that after segmentation of the speech signal a wavelet transformation is calculated for each frame, from which--with the help of an adaptive threshold--a set of parameters is determined, this set of parameters controlling a status model that divides the frame into shorter subframes and then assigns each of these subframes into one of several classes that are typical for speech coding. The speech signal is classified on the basis of the wavelet transformation for each time frame. Thus, it is possible to achieve a high level of resolution in the time range (localisation of pulses) and in the frequency range (good average values). This method and the classifier are thus suitable, in particular, for controlling or selecting code books in a low rate speech coder. In addition, that are not sensitive to background noise, and display a low level of complexity.
Deutsche Telekom Ag
Fetherstonhaugh & Co.
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