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  #1 (permalink)  
Old 12-09-2003, 01:35 AM
Matt Roos
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Default nonlinear signal processing

Hi, All.

I haven't been as deeply involved in signal processing work as I once was
(unfortunately) and I was wondering if some of you could fill me in on any
new developments.

Has nonlinear processing made any headway? I'm sure linear processing is
still the backbone, but I'm curious if there are new things that can be
acheived with nonlinear means, especially with processing power become
cheaper and cheaper. Are there some good textbook references on nonlinear
methods?

Has anyone been using the Hilbert-Huang Transform for anything useful? I
recently read an old (1998?) paper on it and while interesting, I'd like to
know if it's being actively used.

Thanks!
Matt

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  #2 (permalink)  
Old 12-09-2003, 02:27 AM
Matt Timmermans
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Default Re: nonlinear signal processing

I'm not really up papered-up in this area, but I think solitons are darned
cool. See http://www.ma.hw.ac.uk/solitons/index.html

And thanks for the pointer to the Hilbert-Huang transform. That's darned
cool too.


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  #3 (permalink)  
Old 12-09-2003, 11:39 AM
Rune Allnor
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Default Re: nonlinear signal processing

"Matt Roos" <[email protected]> wrote in message news:<[email protected]>...
> Hi, All.
>
> I haven't been as deeply involved in signal processing work as I once was
> (unfortunately) and I was wondering if some of you could fill me in on any
> new developments.
>
> Has nonlinear processing made any headway? I'm sure linear processing is
> still the backbone, but I'm curious if there are new things that can be
> acheived with nonlinear means, especially with processing power become
> cheaper and cheaper. Are there some good textbook references on nonlinear
> methods?
>
> Has anyone been using the Hilbert-Huang Transform for anything useful? I
> recently read an old (1998?) paper on it and while interesting, I'd like to
> know if it's being actively used.


Heh... I think we regard the age of papers on a slightly different scale...
five years is not old in my terms. But then, I only read papers. Seen from
the author's perspective, things might be different.

Now, I have a vague interest in nonlinear SP too, and I would like to
see this paper you mention. Could you post a reference to it?

Rune
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  #4 (permalink)  
Old 12-09-2003, 01:16 PM
Ian Buckner
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Default Re: nonlinear signal processing


"Matt Timmermans" <[email protected]> wrote in message
news:[email protected] ..
> I'm not really up papered-up in this area, but I think solitons are

darned
> cool. See http://www.ma.hw.ac.uk/solitons/index.html
>
> And thanks for the pointer to the Hilbert-Huang transform. That's

darned
> cool too.
>
>


About a mile from my house there is a plaque on a bridge over the
canal, commemorating the first observation of a soliton.

Regards
Ian


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  #5 (permalink)  
Old 12-09-2003, 02:35 PM
Matt Roos
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Default Re: nonlinear signal processing

http://www.fuentek.com/technologies/hht.htm

Go to the bottom for a list of papers. I read the third one in the list.

Matt

"Rune Allnor" <[email protected]> wrote in message
news:[email protected] om...
> "Matt Roos" <[email protected]> wrote in message

news:<[email protected]>...
> > Hi, All.
> >
> > I haven't been as deeply involved in signal processing work as I once

was
> > (unfortunately) and I was wondering if some of you could fill me in on

any
> > new developments.
> >
> > Has nonlinear processing made any headway? I'm sure linear processing

is
> > still the backbone, but I'm curious if there are new things that can be
> > acheived with nonlinear means, especially with processing power become
> > cheaper and cheaper. Are there some good textbook references on

nonlinear
> > methods?
> >
> > Has anyone been using the Hilbert-Huang Transform for anything useful?

I
> > recently read an old (1998?) paper on it and while interesting, I'd like

to
> > know if it's being actively used.

>
> Heh... I think we regard the age of papers on a slightly different

scale...
> five years is not old in my terms. But then, I only read papers. Seen from
> the author's perspective, things might be different.
>
> Now, I have a vague interest in nonlinear SP too, and I would like to
> see this paper you mention. Could you post a reference to it?
>
> Rune



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  #6 (permalink)  
Old 12-09-2003, 03:17 PM
Dmitry Terez
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Posts: n/a
Default Re: nonlinear signal processing

"Matt Roos" <[email protected]> wrote in message news:<[email protected]>...
> Hi, All.
>
> I haven't been as deeply involved in signal processing work as I once was
> (unfortunately) and I was wondering if some of you could fill me in on any
> new developments.
>
> Has nonlinear processing made any headway? I'm sure linear processing is
> still the backbone, but I'm curious if there are new things that can be
> acheived with nonlinear means, especially with processing power become
> cheaper and cheaper. Are there some good textbook references on nonlinear
> methods?
>
> Has anyone been using the Hilbert-Huang Transform for anything useful? I
> recently read an old (1998?) paper on it and while interesting, I'd like to
> know if it's being actively used.
>
> Thanks!
> Matt



There is a lot of growing interest in nonlinear signal processing at
present,
in particular, as applied to speech processing (e.g. speech coding for
wireless telecom).

I believe that one of the key recent developments in nonlinear speech
processing
was finding the ultimate solution to the notorious pitch (fundamental
frequency)
detection problem using methods of signal embedding in
multi-dimensional state space
(a concept originally introduced more than 20 years ago for analyzing
chaotic time series).

This will be a textbook stuff someday.

Go to http://www.soundmathtech.com/pitch for more information.

As far as Hilbert-Huang Transform is concerned, it is being actively
developed
and marketed by NASA.

The web-page is at http://techtransfer.gsfc.nasa.gov/HHT/HHT.htm

Needless to say, all new and important techniques are under patents...

Regards,

Dmitry Terez
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  #7 (permalink)  
Old 12-09-2003, 03:37 PM
Clay S. Turner
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Default Re: nonlinear signal processing


"Ian Buckner" <[email protected]> wrote in message
news:[email protected]
> About a mile from my house there is a plaque on a bridge over the
> canal, commemorating the first observation of a soliton.


Apparently in 1995, scientists went back to the canal and recreated the
soliton.

See:

http://www.ma.hw.ac.uk/solitons/press.html

Clay


>
> Regards
> Ian
>
>



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