Multipurpose speech watermarking based on multistage vector quantization of linear prediction coefficients  

作　　者：CHEN Ning ZHU Jie 

机构地区：[1]Department of Electronic Engineering, Shanghai Jiao Tong University,Shanghai 200030, China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2007年第4期64-69,共6页中国邮电高校学报（英文版）

摘　　要：To make speech watermarking achieve both copyright protection and integrity verification, a novel multipurpose speech watermarking algorithm based on the multistage vector quantization （MSVQ） of linear prediction coefficients （LPCs） is presented in this article. The property of natural speech that the vector quantization （VQ） indices of the LPCs amongst neighboring frames tend to be very similar is utilized to embed the robust watermark in the indices of the first-stage VQ（VQ1）. Then, the semi-fragile watermark is embedded in the indices of the second-stage VQ（VQ2） with index constrained VQ encoding scheme. Both the robust watermark and the semi-fragile watermark can be extracted without host speech. Simulation results verify the effectiveness of the proposed algorithm in terms of robustness and semi-fragility.To make speech watermarking achieve both copyright protection and integrity verification, a novel multipurpose speech watermarking algorithm based on the multistage vector quantization （MSVQ） of linear prediction coefficients （LPCs） is presented in this article. The property of natural speech that the vector quantization （VQ） indices of the LPCs amongst neighboring frames tend to be very similar is utilized to embed the robust watermark in the indices of the first-stage VQ（VQ1）. Then, the semi-fragile watermark is embedded in the indices of the second-stage VQ（VQ2） with index constrained VQ encoding scheme. Both the robust watermark and the semi-fragile watermark can be extracted without host speech. Simulation results verify the effectiveness of the proposed algorithm in terms of robustness and semi-fragility.

关 键 词：multipurpose speech watermarking LPCs MSVQ 

分 类 号：TP309[自动化与计算机技术—计算机系统结构] TN912[自动化与计算机技术—计算机科学与技术]