extract the random part of the signal

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• How to extract the signal from the waveform of my power level designated?

  Hi all

  How can I extract the signal of the waveform accroding to the power level? I read the Trigger & Gate .vi, but this vi retrieves the signal duration. I want to extract the signal depending on the power level.

  As shown in the following figures, the signal I want to deal with is between 130000 to 140000, if I Zoom, I can see the useful signal is between 135400 to 138200. The question is how to extract the signal in the area?

  I tried the sub_NoiseEst_And_Chop_Shell.vi in the example of Packet_based_link also, but this Subvi seems to be a bit slow. Can someone give me the best advice? Thanks in advance!

  

  

  I'm working on something similar, but have not had time to fully develop.

  My idea was to use an envelope detector (low pass filter) and then use a detection of energy VI on the envelope.

  Here is where I left

  

• Extraction of a part of the graph

  I need to extract a part of the graph.

  I know the start and end point in the x-axis and I need to know the values of the y-axis.

  I used express VI 'extract a portion of the signal' but I don't get the values correctly.

  There is a picture with this, in which the part in the red zone is the part that I have to extract.

  Use get subset of waveform

• Determine the position of a part of the signal on a graph

  Hi all

  I have a problem. I determine the position of a part of the signal on a chart. So, I have to determine the maximum value of the part (this is not a problem).

  Signal a lot of noise. I did some filtration but still signal have noise. Concerning this, filter change signal, two later when I take one measure, there is a possibility that this is not true.

  Anyone has idea how to determine the position of a part of a signal automatically, for the various signals (similar).

  There are photos attached where is what belongs to an interest in a signal. There is a VI where is an a test signal.

  Thank you

  Hello

  From the screenshot, I understand that you only interested in the local maximum of the signal.

  There is a VI that detects peaks when you specify a certaing point and this point maximum width.

  Later, it's just a matter of setting the value of local maximum of you. Basically, you'll have to point once again got 1 d table than VI.

  I enclose a VI that can be a good starting point for your application.

  Best regards

  Ion R.

• FPGA acquires only the positive part of the signal

  Hi all

  I have the NI USB-7855R and using the personality of DAQ balanced example of e/s (http://www.ni.com/example/5961/en/). I plugged my generator Agilent to AI0 (in mode CSR) and I have the following problems:

  (1) waveform graph in LabVIEW is only to show the positive part of the sine wave that I am providing to the Board of Directors (clipping at 0 V). Only by compensating the signal from the signal generator, I am able to get the two cycles.

  (2) while I am out 5 Vpp on the generator of signals on the graph of a waveform in LabVIEW I see only 1.5 mVp.

  Any suggestions on what could be the problem?

  Thanks in advance or your help!

  The first graph of "analog input" in your link shows the analog inputs are converted to unsigned integers (U32) before their passage in the FPGA-> host FIFO. Negative values will obviously be lost make this conversion.

• I tried several times using IE, Chrome and Firefox browsers (win) to download the files for Indesign CS6 - all of these attempts have failed to extract the files. Other parts of the plant extract successfully, so I don't think I have

  I tried several times using IE, Chrome and Firefox browsers (win) to download the files for Indesign CS6 - all of these attempts have failed to extract the files. Other parts of the plant extract successfully, so I don't think that's my machine or OS (Win 7 Pro). I have been fighting for three days and am losing patience fast. Advice or assistance will be appreciated.

  I finally got it to work using a different machine and copy the files on a USB stick for transfer to the machine I need installed on!

• Two synchronized USRPs receive the same sine wave emitted by an another USRP, there is a phase shift random and obvious between the signals received from the 2 receivers

  Hello world!

  First of all, I use a USRP as a transmitter to emit a sine wave (the signal is exp(j2*pi*f*t)), and then I use the external clock to synchronize the two USRPs (Ref as PPS in are connected to the clock) as receivers. Receivers are in sync, and they are at the same distance from the transmitter, I thought that the signal they receive should have a nearly the same phase. However, in practice, the phase shift is big enough, and this problem really confuses me.

  It's the received signals of 2 receivers.

  Yes. What you observe is expected.

  Near the bottof of this document read the area 'alignment Phase vs Phase coherence '.

  http://www.NI.com/white-paper/14311/en/

  And also, for the alignment phase, see the following 'Angle of arrival detection with NI USRP '.

  https://decibel.NI.com/content/docs/doc-25716

  Erik

• Extracts the Date of Date part /Timestamp part

  Hello
  
  How to extract the party only date without the timestamp value in SQL. For example, from 2008-05-13 01:34:20, I need to extract only the 2008-05-13...
  
  
  Thank you...

  Hello

  Try

  Select to_char(SYSTIMESTAMP,'YYYY-MM-DD') DATE_EXT FROM DUAL;
  

  * 009 *.

  Published by: 009 March 14, 2010 23:30

• filter the peaks on the signal from ECG pulse!, help!

  Hello

  I have RCV of the ECG signal. I filtered the ECG signal and get the resource (interval between each pulse of ECG) records.

  

  The source of the signal have noise I use a threshold but sometimes spikes of failure. Like the previous capture. Normally, if you get a pic of fault detected, I'll try to find this index to add to the left or right of the peak, normally I add to the lower value. This works if it has only a bad impulse between 2 good.

  The problem come when I have more than a ridge between the two coupons.

  Also, when the impulse of R a loss threshold I have trying to find the index and get 2 new reading making division 2 peak value.

  I have attached the method I've used to adapt it. I only works if I have 1 Ridge added on real measures of R or pulse 1 loss R, when I have several pics no work.

  I would like to hear an idea to make it work better. I don't like the idea of removing the value interval, I have 2 hours of reading and if I remove the values I have lower data outoput is why I tried to summarize or division of values to get the correct reading without losing any data.

  Perhaps, there is any better filter for ECG of entry, so I have a R-own pulse and less noise between ECG pulses.

  Any advice is welcome.

  Best regards, Fred.

  Almost.  in the last step, you have extracted the real part of the complex waveform.  Instead, you must retrieve the extent.

  

  BTW, this idea isn't mine.  I got from this article

  http://www.ScienceDirect.com/science/article/PII/S0010482501000099

  

• How can I extract a part of a signal inside a loop control and simulation?

  I would like to extract the part of my signal between 0 and 3 seconds. I tried to use the extract of Portion of Signal VI Express, but it does not work. I'm setting the length to the offset 0 and 3 seconds. However, nothing is displayed in the output. I used this before VI successfully, but it wasn't in a loop control and simulation. Is there something special I need to do to make this work properly in this case?

  This forum shows how to measure the time between the Digital pulse http://forums.ni.com/t5/LabVIEW/Measuring-time-between-digital-pulses/td-p/1056881

  In addition, it would be a good link https://decibel.ni.com/content/docs/DOC-12160

• Why is the signal to my airport express base station weaker?

  My airport express base station to base station (part number MC414LL/A) has worked well for the first 3 years, but now has a weaker signal is no longer covers the apartment. The location has not changed and we have not added all of the devices that could create interference.

  Any help would be appreciated.

  Bill

  3 years... average... is on when the internal of food inside the Express starts slowly the head downhill, so maybe it's a factor here.

  If you don't have already done, power off the AirPort Express for a few seconds, then put it to the top. When you start the Express, it will automatically scan all channels use wireless sector and select the best channel to use both.  If you live in a crowded environment, you may have to restart the AirPort Express on a regular basis.

  If there is no improvement after a few reboots of the Express, on what you can do at this point is to reset the device back to the default settings and then set up again to see if a new beginning offers some improvements in the intensity of the signal.

• Integration of the signal from Y1 to Y2

  Hello guys,.

  I have a problem and I would like to ask your help, look, I built a VI that supposed to be able to integrate a certain value Y1 [increase] signal to another value Y2 [who]... Please see the photo.

  Right now I am only able to identify the values on the axis of time and points [X] index.

  The attached program, it is able to integrate some X 1 X 2 value another value (this is useless to me)

  What I really want to do is to perform an integration of the signal using the y-axis, by selecting the first value [Y1] when the curve is raising and the second [Y2] value when the curve is declining

  How can I do this? You guys have any ideas?

  Please help me

  I have attached a diagram of what I want to do, the VI and a TXT file with data that must be integrated

  Thank you

  SergeArmz

  This is because the sliders are locked to the plot. So they can only go to the values where there is a data point.  If you create an indicator of table and look at the data values are near index 106 (X 1 Index), you'll see that the intervals ranging from a few thousandths to 3, 4, 5, between the points.

  You can create a free slider. It will not focus to data so the location of the cursor can be anywhere in the plot.  The increments on which depend on scale of the graph. I get = 0.002 dX and dY = 0,096 on the chart on the version I posted earlier.  I connected the slider. Bouquet to the threshold instead of 2 Y1 and it changes the area under the curve in small increments when moved up and down along the steep part of the curve, which is what I expected.

  Lynn

• Extract the Variables from Script Powershell

  Hey guys

  I am building a workflow active directory of this synchronization for the IAC database and I'm looking to make the most effective possible by reducing the amount of powershell scripts I use one only and then use the variables powershell to get what I need.

  Is it possible to extract the variables stored in a variable of workflow instead of use the output of the powershell statement?

  Has anyone built a workflow to users of this synchronization of DB works maximum efficiency on the when modified date now that mine is 28 minutes to synchronize 200 users.

  Matt

  From a design point of view, I would say to use the generic OLEDB data adapter.  There is an OleDB for Active Directory Provider called ADsDSOObject. You can find it by searching on the Microsoft site.  It can be installed as part of the standard Windows or .net.  I'm not sure. If you could get it saved on the server of PO, you would be able to do a select and use the output as native table instead of the Powershell output analysis.

  PowerShell has a tendency to be underperforming.  Certainly, I'd caution against the appellant PowerShell repeatedly in a loop.

• Windows media center on windows 8 may not set up the signal of the TV tuner or find channels

  Just upgraded to win8.

  Downloaded windows media center.

  When you configure channels I get the message 'no downloadable guide found.

  Set up TV signal I get-"no channels not found. "Please check your tv equipment is properly connected to the computer"

  The tuner works and the signal from the antenna is fine as I can implement my Arcsoft media program and watch live TV from there.

  Media Center has worked in windows 7, before the upgrade to windows 8

  The region is the Australia.

  Any help would be welcome.

  Concerning

  Hi S3than,

  Somehow, I solved the problem.

  I ran the installer again.

  I jumped the channel configuration part (where you put the post code)

  I ran the TV signal configuration and it searched and found channels.

  He has also uploaded the TV guide.

  I use Kaiser Baas TVstick

  Hope this works for you, it's very frustrating.

  See you soon

• How to extract the party date XML dateTime data type

  Hi all
  
  I have a problem with the extraction of the date part of the dateTime data type. I am getting my output * 2012-09 - 28 T 21: 49:45 * in this format. I need to extract the date part which is
  
  * 2012-09-28 * excluding the time. Kindly help me out by doing this. I'm new to the world of xml. Sorry if this question seems to be too stupid, but I'm quite help less.
  
  Thank you

  What error do you get?

  These two work for me:

  let $myDateTime := xs:dateTime("2012-09-28T21:49:45")
  return {$myDateTime cast as xs:date}
  

  let $myDateTime := xs:dateTime("2012-09-28T21:49:45")
  return {xs:date($myDateTime)}