This refers to GRAPHING the numbers
Xunknown + Noise = Xreal (more closely,
anyway)
Ok, kids. Which is it?
Specifically, I understand Alice's point but is Andy talking about averaging
data or what? How else can an Xunknown be made more Xreal with noise?
Also, doesn't adding a "third dimension to the graph" have the same effect
as averaging during the time that the Xunknown is at that point? in that it
makes it clear that X was REALLY at this point for a while.
---
James Newton (PICList Admin #3)
mailto:jamesnewton@piclist.com 1-619-652-0593
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-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of James Newton
Sent: Wednesday, May 03, 2000 09:34
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT] [EE] 24-bit A/D. Are We in the Twilite Zone Here?
Importance: Low
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?
-----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
> ==============