OPTIMIZED SCALING FACTOR FOR EXTENSION OF FREQUENCY RANGE IN DECODER OF AUDIO FREQUENCY SIGNALS Russian patent published in 2018 - IPC G10L21/38 G10L19/87 G10L19/24 

FIELD: speech analysis or synthesis; speech recognition.

SUBSTANCE: invention relates to means for extending a frequency range when decoding audio signals. Excitation signal and the parameters of the first frequency band containing the coefficients of the linear prediction filter are decoded in the first frequency band. Enhanced excitation signal is generated on at least one second frequency band. Filtered by a linear prediction filter for the second frequency band. In this case, a linear prediction filter, called an additional filter, is determined to be of a lower order than the linear prediction filter of the first frequency band. In this case, the additional filter coefficients are obtained from parameters decoded or extracted from the first frequency band. Optimized scaling factor is calculated as a function of at least the coefficients of the additional filter.

EFFECT: technical result is increased efficiency of extending the frequency range without additional information from the encoder.

10 cl, 10 dwg