[WM]: Re: SS against D-A-D

[Xing He <xhe@umsis.miami.edu>]

1. SS is not fragile against D-A-D
2. the sync may have problem
2. the watermark is too long

Regards,

Xing
----- Original Message -----
From: "Mauricio Lopez" <miciolopez@hotmail.com>
To: <watermarking@watermarkingworld.org>
Sent: Tuesday, November 02, 2004 8:40 PM
Subject: [WM]: SS against D-A-D


> Recently, i have implemented the watermarking scheme developed by Ricardo 
> A. Garcia  "Digital Watermarking of Audio Signals Using a Psychoacoustic 
> Auditory Model And Spread Spectrum Theory"  My watermark
> length is 98304 points, at the moment a have not implemented a 
> syncrhonization method, but, instead i am using a pulse when i want
> to know if the scheme is robust against MPEG compression.  I am also using 
> a sin wave
> (F=500,Fs=44100,n=(0:6655)) at the beguining of the sound signal to 
> synchronize the signal using correlation to know if the scheme
> is robust against D-A-D
> conversion.   The result is always the same: The watermark does not resist 
> the media attack.
>
> Is it because the watermark is too long?? or SS watermarking is fragil 
> against D-A-D?? or is there any problem with the sync
> method??
>


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