High Efficiency Stereo Audio Compression Method Using Polar Coordinate Principle Component Analysis for Wireless Communications  

基于极坐标域主成分分析的无线通信立体声参数编码技术(英文)

作　　者：董石 胡瑞敏 涂卫平 王晓晨 郑翔 

机构地区：[1]National Engineering Research Center for Multimedia Software, Wuhan University

出　　处：《China Communications》2013年第2期98-111,共14页中国通信（英文版）

基　　金：supported by National Natural Science Foundation of China under Grants No. 61231015, No. 61102127 No. 61201340, No. 61201169;Major National Science and Technology Special Projects under Grant No. 2010ZX03004-003-03;Natural Science Foundation of Hubei Province under Grant No. 2011CDB451;Wuhan ChenGuang Science and Technology Plan under Grant No. 201150431104;the Fundamental Research Funds for the Central Universities

摘　　要：High efficiency audio compression is the basic technology in audio involved multimedia communications. Downmixing and parametric coding is efficient coding scheme with wide applications in some up-to-date audio codecs such as Parametric Stereo (PS) in EAAC+ and MPEG-Surround. Principle Component Analysis (PCA) stereo coding followed this idea to map two channels to one channel with maximum energy and parameterize the secondary channel. This paper investigates the conventional PCA method performance under general stereo model with multiple sound sources and different directions, and then proposes a Polar Coordinate based PCA (PC-PCA) stereo coding method. It has been proved that when multiple sound sources exist with different directions, PC-PCA is better than the conventional PCA method when Mean to Standard deviation Ratio (MSR) is large. A stereo codec based on PC-PCA is proposed to validate the performance improvement of proposed method. Objective and subjective tests show the proposed method achieves a comparative quality and saves 50% parameter bit rate comparing with conventional PCA method, and obtains a 4-8 MUSHRA scores improvement comparing with state-of-the-art stereo codec at the same parameter bit rate.High efficiency audio compression is the basic technology in audio involved mul-timedia communications. Downmixing and parametric coding is efficient coding scheme with wide applications in some up-to-date audio codecs such as Parametric Stereo （PS） in EAAC＋ and MPEG-Surround. Principle Component Analysis （PCA） stereo coding followed this idea to map two channels to one channel with maximum energy and param-eterize the secondary channel. This paper in-vestigates the conventional PCA method per-formance under general stereo model with multiple sound sources and different direc-tions, and then proposes a Polar Coordinate based PCA （PC-PCA） stereo coding method. It has been proved that when multiple sound sources exist with different directions, PC-PCA is better than the conventional PCA method when Mean to Standard deviation Ratio （MSR） is large. A stereo codec based on PC-PCA is proposed to validate the perform-ance improvement of proposed method. Ob-jective and subjective tests show the proposed method achieves a comparative quality and saves 50% parameter bit rate comparing with conventional PCA method, and obtains a 4-8 MUSHRA scores improvement comparing with state-of-the-art stereo codec at the same parameter bit rate.

关 键 词：PCA stereo audio audio com-pression 

分 类 号：TN911.2[电子电信—通信与信息系统]