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Re: Trying to follow the math behind wavelets

by Frnak McKenney <frnak@[EMAIL PROTECTED] > Oct 14, 2008 at 02:33 PM

Martin,

Thanks for the interest.  I haven't given up on my research, but
other things keep interrupting.

On 11 Oct 2008 19:03:50 GMT, Martin Eisenberg <martin.eisenberg@[EMAIL PROTECTED]
>
wrote:
> Fr**** McKenney wrote:
> 
>> On the off chance that someone muight be curious, I thought I'd
>> post a sample of a WWV waveform being "decoded" using wavelets. 
> 
> So you haven't drowned after all.

No, but we haven't had much rain lately, so there's still hope.
<grin!>

> ... With hindsight, do you see any 
> benefits of wavelets over other approaches to this task?

The "demo" I posted shows me that I _can_ use wavelets to clearly
pick WWV's digital time-code information out of an ideal (e.g.
Scilab-generated) signal.

On the other hand, using the same techniques on parts of a WAV file
recorded off a Heathkit MAC-II with an indoor antenna shows me that
this data is a lot harder to pick out from a RealWorld(tm) signal.
The audible ****tions of the recording are moderately clear most of
the time, so I'm assuming I didn't lose too much of the 100Hz during
recording, and I _think_ I can spot the data bits here and there,
but they come and go as I work my way through the WAV file.

Next step:  use wavelets to try reducing the noise.

Several of the papers in my collection describe what seems like a
reasonable technique:  dropping the signal gain at points where
there is "wideband" activity, that is, the wavelet "filtering" shows
presence simultaneously across a wide range of scales.

Hm.  And, just for grins (since it only now occurred to me), I think
I'll check the 100Hz performance of the recording system's audio
sup****t; all the K8N-E book says is "Realtek ALC850", so I may have
to dig out my signal generator.


Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
Munged E-mail: frank uscore mckenney ayut mined spring dawt cahm (y'all)
 




 39 Posts in Topic:
Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-08-22 09:30:03 
Re: Trying to follow the math behind wavelets
robert bristow-johnson &l  2008-08-22 09:26:24 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-08-24 15:33:35 
Re: Trying to follow the math behind wavelets
Ben Bradley <ben_nospa  2008-08-28 00:43:41 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-08-31 13:04:14 
Re: Trying to follow the math behind wavelets
Rune Allnor <allnor@[E  2008-08-22 12:18:05 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-08-24 15:35:06 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-08-22 19:46:17 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-08-24 15:38:02 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-08-26 20:06:02 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-08-31 13:03:18 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-08-31 21:18:57 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-04 08:17:30 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-09-05 14:32:22 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-06 19:19:11 
Re: Trying to follow the math behind wavelets
Rune Allnor <allnor@[E  2008-08-24 23:05:06 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-08-31 13:02:00 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-09-01 13:30:18 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-04 15:01:47 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-09-05 15:33:20 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-06 20:58:09 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-09-07 11:23:39 
OT: Trying to follow the math behind wavelets
Jerry Avins <jya@[EMAI  2008-09-07 08:19:46 
Re: OT: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-09-08 15:26:49 
Re: OT: Trying to follow the math behind wavelets
Jerry Avins <jya@[EMAI  2008-09-08 13:43:49 
Re: Trying to follow the math behind wavelets
Rune Allnor <allnor@[E  2008-09-01 01:28:28 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-04 08:14:59 
Re: Trying to follow the math behind wavelets
kennheinrich@[EMAIL PROTE  2008-09-02 06:09:10 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-04 08:19:51 
Re: Trying to follow the math behind wavelets
robert bristow-johnson &l  2008-09-04 08:54:00 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-06 19:16:15 
Re: Trying to follow the math behind wavelets
clay@[EMAIL PROTECTED]   2008-09-04 13:36:42 
Re: Trying to follow the math behind wavelets
clay@[EMAIL PROTECTED]   2008-09-04 13:38:16 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-09-06 19:18:15 
Re: Trying to follow the math behind wavelets
clay@[EMAIL PROTECTED]   2008-09-07 09:27:02 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-10-08 14:51:09 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-10-08 14:58:16 
Re: Trying to follow the math behind wavelets
Martin Eisenberg <mart  2008-10-11 19:03:50 
Re: Trying to follow the math behind wavelets
Frnak McKenney <frnak@  2008-10-14 14:33:29 

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