AUDIO DECODER HAVING BANDWIDTH EXPANSION MODULE WITH ENERGY REGULATION MODULE Russian patent published in 2018 - IPC G10L19/05 

FIELD: physics.

SUBSTANCE: audio decoder comprises a baseband decoding module, a bandwidth expansion module, and a means for combining a baseband audio signal and a bandwidth expansion audio signal. The bandwidth expansion module comprises an energy regulation module configured in such a way that in the current audio frame, in which the audio frame loss occurs, the adjusted signal energy for the current audio frame for at least one frequency band is set based on the current gain for the current audio frame. The current gain is calculated based on the gain from the previous audio frame or from the bitstream, and based on the estimated signal energy. The estimated signal energy is calculated from the spectrum of the current audio frame of the baseband audio signal. The bandwidth expansion module comprises a gain setting module. The frequency expansion module comprises a noise generator and a signal synthesis module.

EFFECT: compensation of decoding errors.

15 cl, 5 dwg