الفهرس 
Chapter (1): IntroductionOnly 14 pages are availabe for public view
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Abstract
Speech communication has captured the interest of researches in the
last decades. There is a bad need to secure speech communication in addition
to the necessity to hide some information in speech signals. This thesis is
concerned with a vital branch of speech processing systems, which is speech
watermarking. Two approaches for watermark embedding in speech signals
are presented in this thesis. The first one depends on the Singular Value
Decomposition (SVD). The SVD is selected to embed encrypted watermarks
in speech signals due to its robustness to slight variations in the signals. This
leads to robustness of the watermark in the presence of different signal
manipulations. The second approach depends on the Empirical Mode
Decomposition (EMD) for watermark embedding with SVD. The inherent
advantage in the EMD is the decomposition of the speech signal into a group
of envelopes. Watermark embedding can be performed in the least sensitive
envelope to deterioration effects. Another trend that is considered in this thesis
is the speech enhancement, especially in the presence of watermarking. The
sensitivity of the watermark extraction process to the speech enhancement
algorithm is also studied.