AUDIO ENCODER AND DECODER FOR INTERLEAVED WAVEFORM CODING Russian patent published in 2023 - IPC G10L19/02 

FIELD: computer engineering.

SUBSTANCE: processing audio data. The technical result is achieved by receiving a first waveform-coded signal having a spectral composition up to the first transition frequency; receiving a second waveform-coded signal having a spectral composition corresponding to a subset of a frequency range above the first transition frequency; receiving high-frequency reconstruction parameters; performing high frequency reconstruction using at least a portion of the first waveform encoded signal and high frequency reconstruction parameters to generate a frequency spread signal having a spectral content above the first transition frequency; adjusting the energy levels of the sub-bands of the frequency spread signal based on target energy levels for the sub-bands; and interleaving the frequency spread signal with a second waveform encoded signal to generate an interleaved signal such that spectral envelope energy levels for the subbands of the interleaved signal correspond to target energy levels for those subbands.

EFFECT: improvement of quality of reconstruction of transient processes and tonal components in high-frequency bands.

21 cl, 9 dwg