Digital watermarking based on process of speech production

Mitsuhiro Hatada; Toshiyuki Sakai; Naohisa Komatsu; Yasushi Yamazaki

doi:10.1117/12.455620

10 December 2002 Digital watermarking based on process of speech production

Mitsuhiro Hatada, Toshiyuki Sakai, Naohisa Komatsu, Yasushi Yamazaki

Proceedings Volume 4861, Multimedia Systems and Applications V; (2002) https://doi.org/10.1117/12.455620
Event: ITCom 2002: The Convergence of Information Technologies and Communications, 2002, Boston, MA, United States

Abstract

A speech production model can be ivided into three parts, namely the glottal source, articulation and radiation, respectively. Some digital watermarking methods for speech that have been proposed are based on modifying quantized values or parameters of a coding scheme. In this paper, we propose a new watermarking method for speech by manipulating the articulaton in the process of speech production. The proposed method is performed by modeling a quasi vocal tract model equivalent to the speech production process. The watermarked vocal tract model is expressed by codebooks made by LSP(Line Spectrum Pair) parameters. The procedure of watermark for speech is as follows; 1) LSPs are extracted from the speech. 2) Some of the extracted LSPs are replaced by the codebook vectors. 3) Speech is synthesized using replaced LSPs. In the process above, watermarks are embedded indirectly into the speech. Evaluation tests on speech quality and accuracy of the proposed method will be discussed with simulation results.

Citation Download Citation

Mitsuhiro Hatada, Toshiyuki Sakai, Naohisa Komatsu, and Yasushi Yamazaki "Digital watermarking based on process of speech production", Proc. SPIE 4861, Multimedia Systems and Applications V, (10 December 2002); https://doi.org/10.1117/12.455620

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