METHOD OF EMBEDDING DIGITAL INFORMATION INTO AUDIO SIGNAL Russian patent published in 2014 - IPC G10L19/00 

FIELD: information technology.

SUBSTANCE: method of embedding digital information into an audio signal involves performing the following operations: dividing digital information into high-priority and low-priority streams, wherein the high-priority data are embedded via frequency-selective echo modulation, and the low-priority data are embedded through noise-like signals or using multi-carrier digital modulation; dividing the initial audio signal into a first frequency portion and a second frequency portion. The first frequency portion of the initial audio signal is modulated via frequency-selective echo modulation with different delay and echo signal amplitude values, and the second frequency portion of the initial audio signal is transmitted to a unit for psycho-acoustic analysis based on a psycho-acoustic model which takes into account a frequency and/or time masking effect, wherein the psycho-acoustic analysis unit generates at each analysis interval a spectral mask which reflects the audibility threshold of distortions, and said spectral mask is applied to a multi-carrier signal or to a noise-like signal with subsequent addition of the obtained signal in the psycho-acoustic analysis unit to the second frequency portion of the initial audio signal; combining the two modulated frequency portions of the acoustic signal.

EFFECT: improved method.

5 cl, 7 dwg