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From: "Thomas Magma"
References: <firstname.lastname@example.org> <email@example.com> <3DAF907C.54D0567F@webaccess.net>
Subject: Re: DSP 2's complement vs straight binary
X-Newsreader: Microsoft Outlook Express 5.50.4133.2400
Date: Fri, 18 Oct 2002 05:07:30 GMT
NNTP-Posting-Date: Thu, 17 Oct 2002 23:07:30 MDT
Organization: Shaw Residential Internet
OK I see the light. Sorry for my ignorance. Let me try to explain my
stupidity. A long time ago I had written some software that converted lets
say the value 7 binary to the value 7 two's compliment. 7 being 00000111 in
binary and 11111001 in 2's compliment. You can see that this is not simply
inverting the MSB. But I now see that inverting the MSB does offset a
straight binary sine wave from a DC offset to a true AC signal. Oops.
I still don't want to do that extra program execution to the megbytes of
samples I have if I don't have to.
"Chuck Simmons" wrote in message
> Thomas Magma wrote:
> > Ya, I don't know what Analog is trying to say there but I'm sure that
> > inverting the MSB does not convert straight binary to 2's complement. I
> > my books at works but here is what I could quickly find on the net to
> > my point.
> 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
> That looks right to me.
> ... The times have been,
> That, when the brains were out,
> the man would die. ... Macbeth
> Chuck Simmons firstname.lastname@example.org
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