TIME WARPING FRAMES IN BROADBAND VOCODER Russian patent published in 2011 - IPC G10L21/04 G10L19/14 

FIELD: information technology.

SUBSTANCE: speech transmission method involves time warping a residual low-band speech signal into a stretched or compressed version of the residual low-band speech signal, time warping a high-band speech signal into a stretched or compressed version of the high-band speech signal and combined the time warped low-band and high-band speech signals to obtain a complete time warped speech signal. Time warping of the high-band speech signal includes determination of a set of periods of the fundamental tone from the low-band speech signal, using periods of the fundamental tone from the low-band speech signal and overlapping/summation of one or more periods of the main tone if the high-band speech signal is compressed, and overlapping/summation or repetition of one or more periods of the fundamental tone if the high-band speech signal is stretched. The method may also involves steps on which speech segments are classified and linear predictive coding with code excitation, linear predictive coding with noise excitation or 1/8 frame (pause) coding is carried out.

EFFECT: high quality of time warping frames and reducing the computational load.

51 cl, 10 dwg