I don't understand "duplicate numbers slide off the top of one another".

I also can't see how this jittering could have any positive effect. I could
understand shifting it one bit left and then average with previous
readings... The random extra bit makes the reading #.5 rather than #.0. Is
that what we are talking about?

---
James Newton (PICList Admin #3)
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-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Alice Campbell
Sent: Wednesday, May 03, 2000 01:08
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT] [EE] 24-bit A/D. Are We in the Twilite Zone Here?


Dan:
Think of it as the opposite of averaging data. to average,
shift right and get twice the number of samples.  To jitter,
shift left one space and add 1 bit randomly + or - to each
one.  Suddenly duplicate numbers slide off the top of one
another.  Particularly useful for plotting data or making
sounds,the blurry data is actually more usable than the
original.

alice


> At 03:24 AM 4/29/00 -0700,  Tom Handley wrote:
> ........
> >PSBS: I had more to say on the LTC2400 and Dennis' comments about
> >`Think before you comment' and "Bit Jittering" which I assume meant
> >"Dithering" which I don't think is practical at the sub uV level but
> >I've been busy and I'll try to follow up...
> >
>
> Tom,
>
> I've been itching to hear your comments on signal "jittering/dithering".
>
> Andy Kunz mentioned in passing that he uses this technique, but did
> not elaborate on how it was done or what kind of improvement he saw.
>
> best regards,
> - Dan Michaels
> ==============