A Low Complexity Spatial Parameter Codec Algorithm in MDCT Domain

With stereo audio steping into people´s daily lives, spatial parametric technology comes to its broad prospects for development. Spatial parameteric technology is a method for stereo compression. MDCT is excluded in the current scheme for spatial cues representation,due to its lacking of phase information and energy conservation. In this paper, Construction of new spatial parameter codec framework in MDCT domain, and Optimization of calculating for the new module, to reduce computational complexity of the system. A Low Complexity Spatial Parameter Codec Algorithm in MDCT Domain was proposed to improve it. The MDCT-MDST conversion, in matrix form, is approximating to a banded sparse matrix. To compare with the EaacPlus system, this method avoids separate transforming for cues representation and saves significant computation, realizing low-complexity and high-efficiency spatial parameter codec, reducing 26.1% of operation complexity.