Ridges

Similar Questions

• Ridge detector does not properly

  The Ridge detector not give me the right places. The main file is called activation time. I use the probe but cannot understand why im getting the wrong places. Thank you in advance.

  Your Ridge detector seems to work just for me.  I rewrote the vi to make summits that were detected more easy to see.  You put them all into a 2D array, which resulted in many many zeros.  I have grouped the data in a table of clusters.  Each cluster contained a table of the peaks for each line.

• Ridge detector malfunctioned.

  Hello

  I'm working on a project in which I want to calculate the rate of certain signals. I used the Ridge detector to detect the peak of the wave.

  The Ridge detector works properly, but after some time as 40 seconds it starts counting the noise (which is less than the value of the Amplitude, and which was previously not count), I don't know the reason for it.

  Can someone pls help me solve this problem

  Thank you v.much

  Hello

  Finally working on the first vi I found the solution to my problem

  The reason why I got for the evolution of the value of the rate was this picture filled, i.e. with time, the table gets more and more values and he took the time to work on it and therefore the vi give erroneous results in the rate.

  I finally limited the value of the table and then past this range limited to the consumers section of producer for the calculation and then it worked correctly.

  I ask everyone to answer me if I took the right path for the solution.

  Thanks to all who have helped me get a solution.

  Concerning

• detect where a threshold crossed a ridge

  I want to be able to detect the point at which a threshold crossed a ridge as shown in the figure, I know the threshold VI will give me the point was, but I also want to be able to get the point B, ideas?

  

  I would use two paintings, the original and the negative.  Search (or threshold) the table of origin for the threshold value until the threshold is found then search (or point) reversed the negative table for the value of fhreshold from the index where the first threshold.  The two indexes will be correct and the values are correct except that the value of the second should be reversed to give the correct value.

• Ridge table waveform detector

  Hi all

  I have problems trying to work with the Ridge detector tool... I have a file which contains 17 columns, that the first's time and the rest are data... I split and now Im trying to find the vertices of the first wave... I'm looking around and I find that it is only something bound on how the Ridge detector to receive data. IM now trying to convert the files again in a table, but only inside labview and I think that will solve this problem... but I can't.

  Please if someone could help me I will be really great

  In the attachments, you can find the .vi file and the excel file to run the program...

  Thank you...

  In Excel, I save the .csv file in .txt file and then do something like shown in the attached VI by reading the file using "reading of the File.vi worksheet.  This way, you have full access to real values, including the table of time within the LabVIEW program... Don

• When I try to watch a video that is ridged, so I don't see it.

  Videos of poor quality or bad video player

  It depends on your phone. What model and version of Android?

• location in the Ridge detector indicator

  I went through the context help for peak detector. I force understand the importance of the location indicator. Can someone give detailed information on how to find places of any input signal. ?

  If my proposal here:

  

  If you have another type of Signal, describe it or show it.

• Measure the time between the ridges of the periodic input signal

  We have built a circuit which is supposed to mimic an Exercycle.  We have an IR switch and a spinning wheel, the rccb meets a comparator circuit and the output of the element of comparison, we have running in LabView.  We successfully were able to measure the number of rotations of the wheel and the total distance travelled by the wheel, but are struggling to measure speed.  We cannot find a way to measure the time between picks in real time, which we could then divide the wheel circumference and calculate the speed in real time.  The VI I posted has a square wave simulated rather than the signal we receive on our circuit.  Thanks in advance for the help.

  Jon and David

  I think you're overloading the things trying to get the time between two pulses.  Instead, you can use the VI Express your measures and select frequency for her custom. Then, you can multiply the circumference of the wheel of the frequency to get the speed.

  I hope this helps.

  -Christina

• Simultaneous Ridge double counting (coincidence)

  Hello. I counted peaks using labview using a simulated signal. Just a. What I have to do now is make another simulation signal and test coincidence - how many times these two signals cross a certain threshold at the SAME time before shutting down. Anyone have an idea how I can go about this? Thanks in advance!

  If we do this in the software, then I suggest first by comparing the signals to a threshold and display of a Boolean value to indicate a level crossing.  Then compare these Boolean values to see if they are both true.

  Please let me know if it would work out.

  Thank you

• Ridge SVFA and the Relative Phase amplitude must be reentrant

  I think I found an obscure problem with one of the "Baseband FFT" s VI on the 'Frequency analysis' subpalette of the Sound and Vibration Measurement Suite. "

  The "Peak Amplitude and Relative Phase SVFA" is set to no reentrant run, but I think it must be defined on preallouee clone running reentrant.  All the other "Baseband FFT" Vi on the 'Analysis of the frequencies' subpalette are implemented reentrant preallouee clone.  This is crucial, because if you use multiple instances of the same VI on a block diagram and feed each instance of another set of entries of waveforms, each instance must maintain its own internal state FYI channel, sampling rate, on average, etc.

  I just found out the hard way after a lot of debugging this including VI has been implemented not reentrant.  On average maintained automatically delivered to zero with warning 1908.  Of course, I had two instances in my diagram, each receiver signals a different set of channels.  Because the VI is not reentrant, he was running an instance with a set of inputs of waveform, then execution of the other instance with a different waveform entries together, then in back and automatically reset on average to each time because the channels kept alternating.

  Don't I have that right?

  Jeremy,

  Looks like our test coverage can use some improvements. You're absolutely right - this VI was to have been put to preallouee clone environment. EI which was originally filed repsonded CAR # 570225 to our development team and it's been fixed for the next version of the software Sound and Vibration.

  Each new version, we write one articulates KnowledgeBase documenting these fixes, for example: the list of fixed bug in 2015.

  Keep an eye on fixed bug list for the next version and this CAR ID to appear in this topic.

• value of Ridge over a given period?

  Hello.

  We are a group of students who are looking for a way to use our blood pressure measurements in labview.

  What we want to do is to have the labview to display the peak value when our curve at the top of the first, then maintain this value for a few seconds. Then show the new peak value

  and that hold a few seconds and so on.

  For now, we can get it to show the peak value, but it updates all the time.

  We tried different approaches, but none of them does not seem to work.

  We show you our project as it is right now. Maybe someone can help.

  Thank you.

  After reading your post a little more closely and looking at the other suggestion on how to solve your problem, I think that's what you want to solve your problem.

• LabVIEW Ridge detector - fails the simple test?

  Hi people.

  I tried two different spectra for the LabVIEW waveform peak detector (LabVIEW 8.5).  It works fine, the other not, and I'm trying to understand why.  VI and attached screenshot.  I've hardcoded the bays so you can just run the VI.  Any thoughts?

  

  Thank you

  Don

  Hi Don,

  Seems to me that the values are all simply too weak.  But it's weird that there is no error generated.

  I don't know if this solution will work for you or not.  But I tried something on a whim and it seems to work.

  

  The only thing I can guess is that the numbers that you were simply too small for the algorithm to work.

• Ridge detection

  There are mainly 2 peaks of the curve as the subplot in attachment 1. It should detect the point of division as the Red cycle.

  I tried to detect where the second derivative change of polarity to locate the point.

  But sometimes there sub such peak in case 1, so will miss it.

  The duration of each peak can also change as in case 2, so I give up to locate the peak in the window of time constraint.

  I also tried the detection of peak in LV function, but some cases also does not fit.

  But in any case, I can identify the point of my eye.

  Is there a good way to do it, can give all the details, thank you.

  Here's a possible algorithm:

  1 calculate the dydt for data.
  2. apply a threshold for dydt values that are of interest.  Keep the index numbers of each element whose absolute value is greater than the threshold.  It would be to restrict your search to the regions where the value increases or decreases of parachute.
  3. look at the "window" of data around each point of interest.  You will need to decide how many data points compose window.
  4. go to the window where there is both a positive dydt negative dydt in reasonably close.  One way would be to use array max/min function and do a subraction.

  I think it will work if you play with the window sizes and threshold.

• Ridge line with default values

  Hi friends I am using JDeveloper 11.1.1.3.I want to create a new line in a table .but this line must have some default values. As an attribute username, still need to show a default name. I need to write the ViewImpl method.

  According to [url http://download.oracle.com/docs/cd/E17904_01/apirefs.1111/e10653/oracle/jbo/server/ViewRowImpl.html#create (oracle.jbo.AttributeList documentation)] the, really want to do this by overriding the method create of the ViewRowImpl class (that is, assuming that in the VO is the right place).

  The Fusion developer [url http://download.oracle.com/docs/cd/E17904_01/web.1111/b31974/bcrules.htm#sthref794] Guide also shows you how to proceed at the level of the OS

  John

• Missing features in pictures

  If someone managed to sort the photos with a title rather than the date. This is a great function in iPhoto, but shamefully he disappeared in pictures, and it prevents to make any kind of organization or edition

  What version of Photos do you use?  Sort by title was added to the Photos with the upgrade of the El Capitan.

  You can sort the photos in any album Ridge you yourself by title. The albums predefined such as "All Photos" have a fixed sort order.

  CTRL-click on the album, select "sort > keep sorted by title.