ROUNDING NOISE SHAPING FOR INTEGER TRANSFORM BASED AUDIO AND VIDEO ENCODING AND DECODING Russian patent published in 2014 - IPC H04N19/117 G10L19/02 

FIELD: physics, video.

SUBSTANCE: invention relates to a method and an apparatus for improving audio and video encoding. A signal is processed using DCT^IV for each block of samples of said signal (x(k)), wherein integer transform is carried out using lifting steps which represent sub-steps of said DCT^IV. Integer transform of said sample blocks using lifting steps and adaptive noise shaping is performed for at least some of said lifting steps, said transform providing corresponding blocks of transform coefficients and noise shaping being performed such that rounding noise from low-level magnitude transform coefficients in a current one of said transformed blocks is decreased whereas rounding noise from high-level magnitude transform coefficients in said current transformed block is increased, and wherein filter coefficients (h(k)) of a corresponding noise shaping filter are derived from said audio or video signal samples on a frame-by-frame basis.

EFFECT: optimising rounding error noise distribution in an integer-reversible transform (DCT^IV).

26 cl, 13 dwg