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The Cyber-Spy.Com Usenet Archive Feeds Directly From The Open And Publicly Available Newsgroup Sci.Electronics.Design This Group And Thousands Of Others Are Available On Most IS NNTP News Servers On Port 119. Cyber-Spy.Com Is NOT Responsible For Any Topic, Opinions Or Content Posted To This Or Any Other Newsgroup. This Web Archive Of The Newsgroup And Posts Are For Informational Purposes Only. X-Admin: news@aol.com From: stevjensen@aol.com (StevJensen) Newsgroups: sci.electronics.design Date: 18 Oct 2002 06:03:26 GMT References: <3DAF9910.914BA71C@webaccess.net> Organization: AOL http://www.aol.com Subject: Re: DSP 2's complement vs straight binary Message-ID: <20021018020326.13047.00002401@mb-mk.aol.com> Chuck Simmons chrlsim@webaccess.net >You unkindly deleted the table I laboriously created with my ten >incredibly nimble thumbs. However, reference to that table will quickly >show that the column of signed decimal numbers I gave converts using 2's >complement exactly to the column of 2's complement numbers obtained from >the original binary column by means of inverting the MSB. The method is >used for A/D and D/A converters where the mid binary code corresponds to >the common mode or zero. > Cute. That last sentence was the key I needed. And it would be a new meaning for 2's complement, at least for me. Thanks for the update. This does generate a question though. Is there some particular advantage in using this common mode/zero method or is it just convenient in some situations. Ok I put your table back in:) Happy now? > Binary MSB inverted Binary value MSB inverted as 2's comp value > 111 011 7 3 > 110 010 6 2 > 101 001 5 1 > 100 000 4 0 > 011 111 3 -1 > 010 110 2 -2 > 001 101 1 -3 > 000 100 0 -4 Go Back To The Cyber-Spy.Com Usenet Web Archive Index Of The sci.electronics.design Newsgroup |
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