Acoustic Time Reversal Underwater Broadband


	Acoustic Time Reversal Underwater Broadband

skwirlinator

7-1-2008 5:28 PM

194 views

tags:

acoustic, time reversal, underwater, broadband

2 Comments |

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7-1-2008 11:21 PM

willhelm

Wow, skwirl. I really like your new picture. It is captivating.

7-2-2008 2:43 AM

skwirlinator

Thanx, I liked it as soon as I saw it

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/7151b178-7766-4ef2-9a25-bac52ba7148c/4444BEF4-76CD-4B68-BDF1-E6A933FF9D82/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733" href="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733" style="font-size: 11px;">www.technovelgy.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733"><H3 align="center"><FONT face="Arial, Helvetica, sans-serif">
      Acoustic Time Reversal Underwater Broadband </FONT>
<IMG src="http://www.technovelgy.com/ct/../graphics/SFITN-LongBillC.gif" /></H3></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.technovelgy.com/img/3A235DA5-181E-46BD-AF20-BB78AF1BCFBD" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733"><FONT face="Arial, Helvetica, sans-serif" size="2"><B>Acoustic time reversal</B> can lead to transfer rates of up to 15 kilobits per second at a range of four kilometers. This is far better than existing techniques and, over long distances, even compares to what whales can do.
</FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733"><P>
<FONT face="Arial, Helvetica, sans-serif" size="2">William Kuperman and colleagues at the Scripps Institution of Oceanography in La Jolla, California, US, and researchers from the NATO Undersea Research Centre in La Spezia, Italy, have been testing the technique in the Mediterranean.
</FONT></P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733"><FONT face="Arial, Helvetica, sans-serif" size="2">Time reversal exploits the way undersea acoustic signals typically arrive clouded by echoes that travel at different speeds. For example, a "ping" may arrive as three separate sounds – one that travelled directly, an echo from the surface and then an echo from the ocean floor.
</FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1733"><FONT face="Arial, Helvetica, sans-serif" size="2">In effect, they converge in time, reconstructing the original signal. The retransmitted sounds will create echoes of their own, but the original signal is strong enough to stand out, say the researchers.
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