http://www.dsprelated.com/showmessage/48180/1.php
http://www.mathworks.com/products/demos/shipping/fixedpoint/fi_radix2fft_demo.html?product=PO
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http://en.wikipedia.org/wiki/Fixed-point_arithmetic
http://en.wikipedia.org/wiki/Binary_scaling
http://en.wikipedia.org/wiki/Q_(number_format)
http://www.embedded.com/98/9804fe2.htm
http://www.embedded.com/design/embeddeddsp/207000901?_requestid=179045
http://www.mathworks.com/products/demos/shipping/fixedpoint/fi_radix2fft_demo.html?product=PO
http://computer00.21ic.org/user1/1028/archives/2009/55429.html
http://courses.cit.cornell.edu/ee476/Math/indexCodevision.html
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http://groups.google.com/group/comp.lang.verilog/browse_thread/thread/ad130a56473c4a34
http://bbs.weeqoo.com/bbsdetail-273959-6.html
http://blog.qz828.com/html/05/705-8890.html
http://blog.gkong.com/more.asp?name=barongeng&id=28311
http://bbs.cnttr.com/archiver/tid-184494.html
http://blog.ednchina.com/sgh1255/3267/message.aspx
http://www.google.com/search?hl=en&q=%E5%AE%9A%E7%82%B9%E8%BF%90%E7%AE%97&btnG=Search
Fixed Point Theory and Applications