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From: "Thomas Magma"
Subject: Re: DSP 2's complement vs straight binary
X-Newsreader: Microsoft Outlook Express 5.50.4133.2400
Date: Fri, 18 Oct 2002 03:07:07 GMT
NNTP-Posting-Date: Thu, 17 Oct 2002 21:07:07 MDT
Organization: Shaw Residential Internet
If you were to simply invert the MSB it would convert the binary number to
something called a "sign magnitude" and not to 2's complement. 2's
complement is how higher level programming languages treats its 'byte'
literals, this what I need.
"John Larkin" wrote in
> On Fri, 18 Oct 2002 01:08:36 GMT, "Thomas Magma"
> >I am involved in a project where we sub-sample the IF, store it to memory
> >and then post-process it. We are at the stage of selecting a ADC for the
> >project. I have noticed that a lot of the ADC's suitable for this design
> >only output straight binary. All of my algorithms to date have used 2's
> >complement (signed) values to perform DFT or FFT functions. Processing
> >is a major concern and we don't have time to convert each binary sample
> >2's complement. Is there an equivalent method of the DFT or FFT that uses
> >straight binary? Or does anybody know of a 3V ADC that puts out 2's
> >compliment and can sub-sample 10.7mhz at less than 1mhz (pipeline)?
> You can't just invert the MSB?
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