METHOD, APPARATUS, DEVICE, COMPUTER-READABLE MEDIUM FOR BANDWIDTH EXTENSION OF AUDIO SIGNAL USING SCALED HIGH-BAND EXCITATION Russian patent published in 2019 - IPC G10L21/38 G10L19/35 G10L19/83 

FIELD: speech analysis or synthesis; speech recognition.

SUBSTANCE: invention relates to signal processing means. Method includes determining a first modeled high-band signal based on a low-band excitation signal of an audio signal, where the audio signal includes a high-band portion and a low-band portion. Method also includes determining a first set of scaling factors based on energy of sub-frames of the first modeled high-band signal and energy of corresponding sub-frames of the high-band portion of the audio signal. Method includes applying a second set of scaling factors based on at least one among the first set of scaling factors to a modeled high-band excitation signal to determine a scaled high-band excitation signal. Second modeled high-band signal is determined based on the scaled high-band excitation signal. Gain parameters are determined based on the second modeled high-band signal and the high-band portion of the audio signal.

EFFECT: technical result consists in increasing signal processing efficiency by reducing the dynamic range of gain information provided to the encoder.

21 cl, 9 dwg