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Proceedings Paper

Digital watermarking based on process of speech production
Author(s): Mitsuhiro Hatada; Toshiyuki Sakai; Naohisa Komatsu; Yasushi Yamazaki
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Paper 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.

Paper Details

Date Published: 10 December 2002
PDF: 10 pages
Proc. SPIE 4861, Multimedia Systems and Applications V, (10 December 2002); doi: 10.1117/12.455620
Show Author Affiliations
Mitsuhiro Hatada, Waseda Univ. (Japan)
Toshiyuki Sakai, Waseda Univ. (Japan)
Naohisa Komatsu, Waseda Univ. (Japan)
Yasushi Yamazaki, Univ. of Kitakyushu (Japan)

Published in SPIE Proceedings Vol. 4861:
Multimedia Systems and Applications V
Andrew G. Tescher; Bhaskaran Vasudev; V. Michael Bove; Ajay Divakaran, Editor(s)

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