Design of Parametric Stereo Coding in MPEG HE-AAC

• Main Authors: Kao, Yung-Hsuan, 高永軒
• Other Authors: Liu, Chi-Min
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/25896043862106224297

碩士 === 國立交通大學 === 多媒體工程研究所 === 97 === Parametric Stereo Coding (PS) tool in HE-AAC v2 is an efficient tool for low bit-rate stereo signal compression. The PS encoder combines the stereo signal into a monaural signal and extracts the stereo parameters. Decoder can reconstruct the similar stereo signal from the monaural signal with the stereo parameters. This thesis considers the PS design from three aspects: the design of stereo parameter extraction, the method of interpolation in downmix/upmix, and the downmix/upmix method with decorrelated signals. Because the output monaural signal of PS can be encoded by the HE-AAC, these methods are integrated in the NCTU-HEAAC for implementation. Finally according to the experiments result of objective (ODG) and subjective (MUSHRA) quality measurement, the proposed methods can reach a better audio quality than previously