FIELD: computer technology.
SUBSTANCE: computer technology for high-frequency reconstruction/regeneration of audio signals. Method includes receiving a narrow-band input audio signal; generating a number of audio signals of low-frequency sub-bands based on a narrow-band input audio signal; receiving a set of target energies, each target energy covering a different target interval within a high frequency interval and indicating the desired energy of audio signals of high frequency subbands lying within the target interval; generating a number of high-frequency sub-band audio signals based on a number of low-frequency sub-band audio signals and based on a number of spectrum gains associated with a number of low-frequency sub-band audio signals, respectively; adjusting the energy of a number of audio signals in high-frequency subranges using a set of target energies; combining audio signals of low-frequency subbands and energy-adjusted audio signals of high-frequency subbands and generating a broadband output audio signal based on the audio signals of the combined subbands; the sampling frequency of the wideband output audio signal is twice the sampling frequency of the narrowband input audio signal.
EFFECT: eliminating unwanted artifacts in the audio signal.
3 cl, 14 dwg
