ADVANCED STEREO CODING BASED ON COMBINATION OF ADAPTIVELY SELECTABLE LEFT/RIGHT OR MID/SIDE STEREO CODING AND OF PARAMETRIC STEREO CODING Russian patent published in 2017 - IPC G10L19/08 H04S3/02 

FIELD: information technology; data processing.

SUBSTANCE: invention relates to means of encoding and decoding audio signals. Downmix signal and a residual signal are generated based on a stereo signal. Difference in intensity between channels and cross-correlation between channels is determined. Preferably, parametric stereo coding parameters are time- and frequency-dependent. Transform stage generates a pseudo left/right stereo signal by performing a transform based on downmix signal and residual signal. Pseudo stereo signal is processed by a perceptual stereo encoder. For stereo coding left/right encoding or mid/side coding may be used. Preferably selection between left/right coding and mid/side coding is depending on time and frequency.

EFFECT: technical result consists in improvement of quality of signal coding.

20 cl, 26 dwg