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標題Title: A Fragile Speech Watermarking Scheme with Recovering Speech Contents
作者Authors: 張弘彬,Chia-Hsiung Liu and Chen..等
上傳單位Department: 資訊工程系
上傳時間Date: 2010-6-28
上傳者Author: 張弘彬
審核單位Department: 資訊工程系
審核老師Teacher: 陳定宏
檔案類型Categories: 課堂報告In-class Report
關鍵詞Keyword: Fragile, LSB, G.723.1, location-variable, content-based
摘要Abstract: The wide use of digital speech recorders becomes
a serious matter when they are involved in assisting with court
rulings. How to distinguish if a recorded content is valid or not
becomes a life-or-death question. In light of this concern, Least
Significant Bits (LSB) of excitation signals would be used as
fragile watermarks in the hybrid speech vocoder. In addition, a
location-variable content-dependent watermark generating
mechanism is proposed. Such location-variable content-based
watermark would allow users to detect where in the recording
the content is being replaced, inserted, or deleted. Lastly, an
attempt is done to store partial reconstruction data in the LSBs
of excitation signals in the G723.1 speech codec, so that the
original speech content may be reconstructed after
counterfeited. The proposed system is demonstrated to be a
reliable system, with test results showing that a recording with
watermarks has a Perceptual Evaluation of Speech Quality
(PESQ) value down 0.2, while the accuracy in detecting faked
regions can be up to 97.45%.

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2010_6_520aa147.pdf 1233Kb pdf 215 29
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