Home | Community | Message Board

Out-Grow.com - Mushroom Growing Kits & Supplies
Please support our sponsors.


Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Shop: Kraken Kratom Red Vein Kratom   Unfolding Nature Unfolding Nature: Being in the Implicate Order   PhytoExtractum Kratom Powder for Sale

Jump to first unread post Pages: 1
OfflineSeussA
Error: divide byzero


Folding@home Statistics
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 4 months, 14 days
Frequency data analysis
    #8545173 - 06/20/08 07:09 PM (13 years, 3 months ago)

I am trying to find a way to analyze some data.  More or less, I have a wire that I have tapped into.  The wire carries groups of pulses followed by a pause, followed by another group of pulses, and so on.  I have sampled the data, and need to write a program that can count the number of pulses in a group.  Not a problem.  Unfortunately, the complex part follows...

It turns out that there are two wires running close together and there is a lot of crosstalk from one of the wires to the other.  There is nothing I can do about this, the problem domain is fixed.  The main thing in common is that both wires get groups of pulses at about the same time.  Because of the crosstalk, I tend to pick up both signals on the signal I am interested in.  This causes my pulse count to double or more.

Even worse, the signals do not carry the exact same data and are not in phase or have a common frequency.  The period of the start time drifts as do the number of pulses in a group as do the periods of the pulses in a group.

I can tap into both wires.  Again, ignore the physics as I am simplifying the domain.  It is the analysis of the data that is important to me.  I have no idea where to begin... (well, I have an idea or two, but they are weak...)  Any ideas are greatly appreciated!


Extras: Filter Print Post Remind Me! Notify Moderator Top
Offlineentheomandotcom
Stranger

Registered: 03/28/08
Posts: 282
Last seen: 12 years, 9 months
Re: Frequency data analysis [Re: Seuss]
    #8545304 - 06/20/08 08:23 PM (13 years, 3 months ago)

Are both wires operating on the same frequency,,im thinking something like a dsl filter,,


Extras: Filter Print Post Remind Me! Notify Moderator Top
InvisibletrendalM
J♠
Male User Gallery


Registered: 04/17/01
Posts: 20,784
Loc: Ontario, Canada Flag
Re: Frequency data analysis [Re: Seuss]
    #8545352 - 06/20/08 08:48 PM (13 years, 3 months ago)

Even worse, the signals do not carry the exact same data and are not in phase or have a common frequency.

That's the part that gets me :frown:

About the crosstalk...it's not at the same voltage as the actual signal, right? Is there any way you could use the difference in voltage?


--------------------
Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.


Extras: Filter Print Post Remind Me! Notify Moderator Top
Offlineentheomandotcom
Stranger

Registered: 03/28/08
Posts: 282
Last seen: 12 years, 9 months
Re: Frequency data analysis [Re: trendal]
    #8545361 - 06/20/08 08:53 PM (13 years, 3 months ago)

Sorry missed that,,


Extras: Filter Print Post Remind Me! Notify Moderator Top
InvisibleDiploidM
Cuban


Folding@home Statistics
Registered: 01/09/03
Posts: 19,274
Loc: Rabbit Hole
Re: Frequency data analysis [Re: Seuss]
    #8545415 - 06/20/08 09:13 PM (13 years, 3 months ago)

More info: what's the nature of these pulses? Are they analog or digital? Sharp voltage ramp envelope or gentle?

Generally, the cross-talk signal will be weaker than the primary signal. If so, you might be able to use a filter to reject the weaker pulses?

Or... if you sample fast enough, you might be able to apply some DSP to invert the cross-talk signal (sampled from the other wire) and add it to the (cross-talk + primary) signal on the wire you're interested in. If it's analog, an op-amp has an inverting input you can use in the same way to get the difference as Trendal suggested.


--------------------
Republican Values:

1) You can't get married to your spouse who is the same sex as you.
2) You can't have an abortion no matter how much you don't want a child.
3) You can't have a certain plant in your possession or you'll get locked up with a rapist and a murderer.

4) We need a smaller, less-intrusive government.


Extras: Filter Print Post Remind Me! Notify Moderator Top
OfflineSeussA
Error: divide byzero


Folding@home Statistics
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 4 months, 14 days
Re: Frequency data analysis [Re: Diploid]
    #8546510 - 06/21/08 06:51 AM (13 years, 3 months ago)

> what's the nature of these pulses? Are they analog or digital?

Analog.  Sample rate is 10KHz, fixed.

> If it's analog, an op-amp has an inverting input you can use in the same way to get the difference as Trendal suggested.

Everything I do has to be at the data level, as I am working with the data that somebody else already gathered.

> you might be able to apply some DSP to invert the cross-talk signal (sampled from the other wire) and add it to the (cross-talk + primary) signal on the wire you're interested in.

Interesting idea. Close to what I was looking at doing.  (I was thinking along the lines of a FFT, drop the lows, inverse FFT) ... but a subtact... hmmm...


--------------------
Just another spore in the wind.


Extras: Filter Print Post Remind Me! Notify Moderator Top
Jump to top Pages: 1

Shop: Kraken Kratom Red Vein Kratom   Unfolding Nature Unfolding Nature: Being in the Implicate Order   PhytoExtractum Kratom Powder for Sale


Similar ThreadsPosterViewsRepliesLast post
* How to Best analyze data. Or a Database Question. C20H25N3O 586 3 03/18/08 02:15 PM
by C20H25N3O
* Good Chemistry Book TheCow 16,809 16 09/04/11 04:34 PM
by rnastruc
* Scientists may have discovered alien signal... Madtowntripper 1,854 12 09/04/04 06:08 PM
by Anonymous
* EEG Analysis of Chemically Assisted Ultra-Conscious States Catalysis 1,453 7 01/27/06 10:50 PM
by Catalysis
* Resonant frequencies
( 1 2 all )
SneezingPenis
3,197 28 03/07/05 04:01 PM
by ChuangTzu
* Researchers encode an entire image worth of data into a single photon cybrbeast 1,128 2 01/24/07 09:57 AM
by Colonel Kurtz Ph.D
* Holographic Data Storage - It's Almost Here! DiploidM 899 2 06/12/06 07:24 PM
by Colonel Kurtz Ph.D
* Faraday cage and different EM frequencies AnnomM 1,431 19 05/14/09 05:51 AM
by deimya

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: trendal, automan
1,085 topic views. 0 members, 1 guests and 0 web crawlers are browsing this forum.
[ Print Topic | ]
Search this thread:

Copyright 1997-2021 Mind Media. Some rights reserved.

Generated in 0.028 seconds spending 0.008 seconds on 16 queries.