Baher: Analog&Digital signal processing is a pretty understandable book
(depending on math background ofcourse)
Matlab has a utility called 'fdatool' which lets you design and
visualize filters very easily. There might be an open-sour equivalent
somewhere.
I would agree with the delay concern
On Tue, 6 Nov 2007, Mario. wrote:
> not want do only do 'some' filtering, ideally we want exact
> counterfilter for our aches. And we need someone with good math skills
> to show us precisely how.
Or at least some basic DSP book :P I'm buying something for work (I have to
filter out mechanical r
Now you speak my language!
In PAL and SECAM it was 64us exactly and it is a quartz delay line,
not glass, and it was in every color TV since there was no other way
how to do it in the early days. (the little box had a whole TV line in
sonic transit! :D) - so it was not only delay, it was a FIFO wit
On Monday 05 November 2007, Jon Elson wrote:
>Kenneth Lerman wrote:
>> Steve,
>>
>> The problem with a filter is that it introduces a delay. So a two-tap
>> filter would introduce a delay of at least one servo cycle. Is that better
>> or worse than just halving the servo cycle? Could feedforward co
Mario. wrote:
> I think the point was more like: running a 10kHz control loop with
> 10-cycle delay instead of running direct 1kHz control loop. I'm not
> being specific here, just the picture.
The reason for a filter is that the encoder is a
doubly-quantized mechanism. First, it only counts disc
Kenneth Lerman wrote:
> Steve,
>
> The problem with a filter is that it introduces a delay. So a two-tap filter
> would introduce a delay of at least one servo cycle. Is that better or worse
> than just halving the servo cycle? Could feedforward compensate for that?
No, if you set up the order of
Stephen Wille Padnos wrote:
>
> What it could be is Intel power management turning off parts of the chip
> or changing the clock speed (even though I disabled that, I think).
>
>
OOOHhh! Nasty stuff. Once it powers down, who knows how long
it takes to power up again? But, maybe it is someth
I think the point was more like: running a 10kHz control loop with
10-cycle delay instead of running direct 1kHz control loop. I'm not
being specific here, just the picture.
On 11/5/07, Kenneth Lerman <[EMAIL PROTECTED]> wrote:
>
> Steve,
>
> The problem with a filter is that it introduces a delay
Nice as a Joke, but I already use a 10 MIPS CPU to do much more
interrupts than the 2GHz PC processors can handle...
Okay everybody, why do we use the crappy PC processors - because of
price - and we are lacking the PowerPC compilers directives like where
to store what... you can direct PPC compil
Steve,
The problem with a filter is that it introduces a delay. So a two-tap filter
would introduce a delay of at least one servo cycle. Is that better or worse
than just halving the servo cycle? Could feedforward compensate for that?
Ken
[EMAIL PROTECTED]
Mark Kenny Products Company, LLC
55 M
Jon Elson wrote:
>Stephen Wille Padnos wrote:
>
>
>>If you have a chance to try out a core2duo sometime soon, then try
>>starting up a do-nothing CPU hog. I've found that to help latencies by
>>roughly an order of magnitude. It's so much better that I actually have
>>an embedded application
Mario. wrote:
> Ehm, if it would be possible with any processor to reach a 500 kHz
> interrupt rate, I would be in heaven suddenly.
500 KHz? I think you'll need to wait for the 1 nm feature size
version of the Pentium 9000, with 250 billion transistors on the
chip, and a clock of 250 GHz. 500 K
Stephen Wille Padnos wrote:
>
> If you have a chance to try out a core2duo sometime soon, then try
> starting up a do-nothing CPU hog. I've found that to help latencies by
> roughly an order of magnitude. It's so much better that I actually have
> an embedded application (which starts up at b
> 2. Released: EMC 2.2.0 (Jeff Epler)
You coder guys rock, Emc2 is AMAZING! my favorite part of it all, i would
have to say, is Axis. (thanks Chris) if i had to use one of the other
control software packages i would still dreaming of building a machine. i
will be trying out the x86_64 po
Ehm, if it would be possible with any processor to reach a 500 kHz
interrupt rate, I would be in heaven suddenly. Where should be the
accelerator script placed? If that would be only to trick the CPU
power and other internal management techniques, then it could be
implementable in the linux core to
Mario. wrote:
>[snip]
>As much as I hate Intel company for their very unfair business
>practices, unfair advertising and bribery I can say that their
>mainboard with integrated processor (~1.3GHz) performs 80 000
>interrupts per second easily. It may be caused by improved linux code,
>since the la
My bottleneck is ..I want use a simple quadrature outputs for movement
in submicron steps, up to 0.5-2 m/s ...I hope you understand :) - that
would give me great dynamic range, plus the smoothness is good then
(accuracy is a different point, but even a system with 10-micron
accuracy can appreciate
On Mon, 5 Nov 2007, Mario. wrote:
> just a basic question: does the x86-64 version have any performance
> benefits in interrupt rate or other processing? Or only marginal?
I think you can fear that x86-64 would be actually _worse_ in the realtime
department! More complex bus access and bridging
Congratulations, can't wait to try it and I wish you the best luck
with EMC2.3 next year :-)
just a basic question: does the x86-64 version have any performance
benefits in interrupt rate or other processing? Or only marginal?
On 11/5/07, Jeff Epler <[EMAIL PROTECTED]> wrote:
> I'm pleased to ann
I'm pleased to announce the first release of the EMC 2.2 series, EMC
2.2.0. After about a year of development, many new features are
available in this release. The documentation (particularly the HTML
documentation) is greatly improved, and a partial translation of the
documentation into the fren
Whoa.. not sure where you got that from :)
AXIS 1.3a2 should be dated sometimes around June 2006, and is seriously
outdated.
Current AXIS versions are included in emc2 (ever since august 2006, I think
AXIS 1.4a0 was the last out of emc2 version).
Maybe you could tell us what you are trying to
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