Since The Theories And Methods Of Synchronous Digital Audio Two-dimensional Watermark

With　the　rapid　development　of　the　network　(especially　Internet)　and　multimedia　technique,　Digital　information　has　been　transmitted　and　used　more　frequently　and　widely.　The　success　of　the　digital　representation　of　analog　media　is　mainly　due　to　properties　like　simple　noise-free　transmission　over　general-purpose　channels,　compact　storage,　perfect　copying,　and　simple　editing.　Not　only　various　advantages　of　the　new　digital　technology　have　been　realized,　but　also　several　drawbacks.　Most　problems　with　digital　media　are　related　to　intellectual　property　rights　and　trustworthiness　of　the　content.　The　traditional　encrypt　technique　could　only　provide　the　incomprehensive　protection,　not　being　safe　enough　and　circulating　freely.　Digital　Watermarking　is　one　efficient　approach　to　enforce　copyrights　or　to　ensure　the　integrity　of　digital　media.　It　is　considered　as　the　imperceptible,　robust,　secure　communication　of　information　by　embedding　it　in　and　retrieving　it　from　other　digital　data.　Digital　audio　watermarking　is　one　of　its　branches.　Current　research　of　audio　watermarking　is　mainly　focusing　on　the　theoretic　algorithm.　Requirements　for　audio　watermark　are　different　according　to　different　application.　For　the　research　of　audio　watermarking,　many　algorithms　have　been　put　forward.　But　the　questions　of　synchronization　and　2-Dimension　gray　watermark　are　of　little　attention.　For　the　above　questions,　this　paper　promotes　a　new　2-dimension　audio　watermarking　algorithm　based　on　integer　wavelet　transform,　in　which　the　gray　image　(2-dimension　digital　watermark)　can　be　embedded　into　the　host　audio　signal.　Experimental　results　show　that　the　proposed　watermarking　scheme　is　inaudible　and　robust　against　various　signal　processing　such　as　re-sampling,　re-quantifying,　low　pass　filtering,　mp3　compression,　and　noising　adding.　　Then,　a　new　synchronization　audio　watermarking　algorithm　is　presented　in　this　paper.　It　embeds　the　position　information　of　the　watermark　image　into　host　audio　signal　by　treating　the　salient　points　as　the　position　flag　through　the　analysis　of　the　audio　signal's　feature　to　resist　against　the　synchronization　attack.　Experimental　results　show　that　the　proposed　watermarking　scheme　is　robust　against　synchronization　attack　and　general　signal　processing.