Extract a signal portion

Hi,
I am new to Labview and trying to extract a portion of a signal. I can display the analog signal catured by an A-D card (Signal A)connected to PCI slot. I can capture another signal from the parallel port (Signal B) which I want to use for timing. Its a digital signal with two levels. I want to capture a portions from Signal A based on the time duration from Signal B and store them in a 2-D array or a matrix, so that I can use it as an image for further processing.
1. how to implement a counter to count number of pulses from signal A? I can convert it for boolian output if necessary.
2.how can I use that counter to extract portions from Signal B?
eg; extract signal from pulse 1 to 10 and store them in a first row of 2-D array
extract pulse 21 to 30 and store them in the second row of the same array and so on.
Or is there any other way to cordinate these two signals so that I can save the reqiured samples from signal A to a 2-d array?
A to D card is not from NI and I cannot use DAQ blocks.
Any help would be highly appreciated. If you can provide VI block diagrams it would be better as I am not that familiar with Labview. This is my first application in Labview.
Thanks and regards,
Ravi.

Hi Fana,
at first you could use a simple "greater or equal" function to find all parts of the waveform that exceed your limit. Then splitting the array should be easy...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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How to extract the signal out from the waveform by my designated power level?

Dear all,
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I was working on something similar but haven't had time to fully develop it.
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Hi, i'm trying to extract a portion of a signal automatically. I've extract it manualy using 2 cursors. I'm interested how can i point the cursor using an indicator. Basically, i have a signal and i want to find the index (index 1) when the signal grows above 0.01, and also when the signal goes below 0.01(index 2). and cut the part before index 1, and also cut the part after index 2. I will attach a photo to be more clear.
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manually extraction.JPG ‏50 KB

Hi Fana,
at first you could use a simple "greater or equal" function to find all parts of the waveform that exceed your limit. Then splitting the array should be easy...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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I have to extract a portion from Graph .
I know the starting and ending point in x-axis and i have to know the y-axis values.
I have used "extract a portion of signal " express VI but am not getting the values correctly.
There is a picture with this, in which the portion in red box is the part i have to extract.
@nk
Solved!
Go to Solution.
Attachments:
Untitled.jpg ‏57 KB

Hi uday ,
Thank you for a fast response .
The VI in the above link shows how to extract a portion of graph with use of cursors. In my VI the user won't do anything . Everything should happen automatically.
First of all.
1.I have detected the peaks in my graph using a peak detector VI. This process have given me the position of peaks in terms of time (i.e x-axis units).
2. I have added a constant offset time like 0.005 sec to each time value and then I provided that value as the starting point of extraction .
3.The length till which the extraction should be done is also kept constant.
4. I just need the amplitude vales of that particular part so that I can use them for my further calculations.
For clear information I am adding a picture of my graph in which the areas I have to extract is perfectly marked inside red box.
@nk
Attachments:
Untitled.jpg ‏57 KB

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If I am loading a signal from an LVM file, is there a way to extract a random portion of the signal? Just some background, I will be loading multiple files in through a for loop/case structure, and each of the files may be of different lengths, so I won't know ahead of time how long the signal is.
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Solved!
Go to Solution.

LVM includes the number of points in each segment header. You can get this by reading and parsing the header yourself. The spec is located here. The Express VIs presume that, being an ASCII file, LVM files are relatively small. As such, the entire file is read into memory by the Express VI. You can use the array or waveform VIs to easily extract a portion of this.
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This account is no longer active. Contact ShadesOfGray for current posts and information.

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Hello
I recently used my Cannon GL2 as a field recorder to record 16 bit audio sound effects.
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Hey Piero
Comestah?
I'm an Italiano too My Granparents are from Bari
Well yes thank you - that certainly answered part of my question
Now I wonder if I can extract just a 'PORTION' of the timeline? I tried to insert division points without actually cutting out all the unwanted stuff, and highlighted just that portion, but the Audio Extract process reverts back to extracting the ENITIRE timeline. So I guess I'd have to actually cut and delete all the unwanted parts, then 'save as' to that NEW iMovie project reflecting just that edit in order to extract JUST that audio piece?
I wonder if the process is more precise in FCE?
Gracias
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Attachments:
Capture.PNG ‏43 KB

If the initial transient always occurs in the first 12 microseconds, you can just use Array Subset or the similar Waveform function to extract the latter portion of the waveform. Then use the peak to peak measurement on that subset.
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Solved!
Go to Solution.
Attachments:
data extraction help needed.zip ‏31 KB

Try the attached VI. as per my understanding you want to remove the data in the array which is grater than the specified value,am right?
Balaji PK (CLA)
Ever tried. Ever failed. No matter. Try again. Fail again. Fail better
Don't forget Kudos for Good Answers, and Mark a solution if your problem is solved.
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Init/cont filter option for a multiple signals

Hi,
I have 2D array with signals from a daq device, now i want to make a highpass and a lowpass filter for all the signals, and every signal can have it's own high and lowpass filter settings and i can have any number of signals. When i connect my 2D array to a for loop and place a filter inside with the init/cont option to true, it resets itself every loop pass. When i extract one signal and pass it trough the filter it works fine. But that's not what i want, i want to have more signals filtered in different ways. I think i understand why it reset itself, in the help file of the filter it says:If init/cont is TRUE, LabVIEW initializes the internal states to the final states from the previous call to this instance of this VI. So it means that every loop pass, it has different data but the same instance... I would like to have different instances for every (for loop) pass. In the attached files the snippets and its outcome:
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Best regards,
Thijs
Solved!
Go to Solution.
Attachments:
highpass_multi_values.png ‏78 KB
highpass_single_value.png ‏73 KB

Hello Thijs,
I made a quick example at my side.
It's not the neatest piece of code and the initialization of the filter coefficients should be outside of the loop, but I just wanted to show the functions you could use to do this.
See attachment.
Kind Regards,
Thierry C - Applications Engineering Specialist Northern European Region - National Instruments
CLD, CTA
If someone helped you, let them know. Mark as solved and/or give a kudo.
Attachments:
Capture.PNG ‏21 KB

How do I pull just the year from a date?

I'm trying to pull just the year from a date and cannot figure out how this can be done. I tried the SUBSTR fuction but its not acting how I would expect. What I'm wanting to do is write a condition that says Item Birth Year = Current Year minus 23 I have a calc that figures the age from the difference in the birthdate and current year but I'd really like to just write a condition based just one years. Can this be done?

Hello
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Edited by: 850791 on 2011-4-11 下午8:56

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Hi,
I think if you use the following method you will be able to compare the members.
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Extract a signal portion

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