PARAMETRIC STEREOPHONIC UPMIX APPARATUS, PARAMETRIC STEREOPHONIC DECODER, PARAMETRIC STEREOPHONIC DOWNMIX APPARATUS, PARAMETRIC STEREOPHONIC ENCODER Russian patent published in 2013 - IPC G10L19/08 

FIELD: physics.

SUBSTANCE: parametric stereophonic upmix apparatus (300, 400) generating a left signal (206) and a right signal (207) from a monophonic downmix signal (204) based on spatial parameters (205). Said parametric stereophonic upmix is characterised by that it comprises a means (310) for predicting a difference signal (311) comprising a difference between the left signal (206) and the right signal (207) based on the monophonic downmix signal (204) scaled with a prediction coefficient (321). Said prediction coefficient is derived from the spatial parameters (205). Said parametric stereophonic upmix apparatus (300, 400) further comprises an arithmetic means (330) for deriving the left signal (206) and the right signal (207) based on a sum and a difference of the monophonic downmix signal (204) and said difference signal (311).

EFFECT: improved sound of quality generated by left and right signals without further increase in bit rate and with no typical instabilities caused by synthesis of inter-sound phase differences.

16 cl, 9 dwg