topic Re: PEAK DETECTION USING ARRAY in LabVIEW

Signal processing

ayushi141 — Thu, 02 Aug 2018 10:41:30 GMT

hi,

I'm Ayushi

i want to detect the peak between these two points using array as shown in the below picture .

Re: Signal processing

jwscs — Thu, 02 Aug 2018 10:48:49 GMT

hi and welcome to the forum!

please skim through this post to get you started

https://forums.ni.com/t5/Community-Documents/Unofficial-Forum-Rules-and-Guidelines/ta-p/3536495

and check your post again .. your image 😞 ... is ... (almost) ... empty

PEAK DETECTION USING ARRAY

ayushi141 — Thu, 02 Aug 2018 11:12:21 GMT

HI,

I WANT TO DETECT THE PEAK BETWEEN THESE TWO POINTS AS SHOWN IN THE FILE

Re: PEAK DETECTION USING ARRAY

GerdW — Thu, 02 Aug 2018 11:32:05 GMT

Hi ayushi,

find the valleys between your points, then find the peak between the valleys…

Re: Signal processing

Arik.v³ — Thu, 02 Aug 2018 11:42:55 GMT

Hi.

Isn't your problem would be solve by using the 'peak detection vi' twice ? (found in maths\signal processing\Signal operation)

Once for finding the valleys, then a second time to find the peak between those valleys.

Re: PEAK DETECTION USING ARRAY

ayushi141 — Fri, 03 Aug 2018 06:21:09 GMT

thanks,

i found the valleys , but i'm not able to find the peaks between these valleys..

Re: PEAK DETECTION USING ARRAY

GerdW — Fri, 03 Aug 2018 06:53:14 GMT

Hi ayushi,

i'm not able to find the peaks between these valleys..

Why aren't you able to find them?

What have you tried?

How does your VI look like? (Attach it!)

Are you really looking for the peaks just in the subset of your waveform between each pair of valleys?

And why don't you find both valleys in the 3rd period of your signal?

Re: PEAK DETECTION USING ARRAY

ayushi141 — Fri, 03 Aug 2018 07:57:34 GMT

i want to detect the peak between each valley .

please find the attachment of my vi.

Re: PEAK DETECTION USING ARRAY

GerdW — Fri, 03 Aug 2018 08:14:39 GMT

Hi ayushi,

right now you try to find all those peaks/valleys/inner peaks globally on the whole waveform!

As said before: try to find those inner peaks just between the valleys found previously!

So you need to implement 3 steps:

1. Find "upper" peaks.

2. Between each pair of peaks from step 1 you need to find the valleys: work with just a subset of the whole waveform from step 1.

3. Between the two valleys from step 2 you again take a subset of the waveform and now try to find the peak on just that subset!

Re: PEAK DETECTION USING ARRAY

samuelaa — Sun, 09 Sep 2018 09:56:25 GMT

Dear All,

I want to use LabVIEW Advanced signal processing toolkit(Discrete wavelet Analysis VI) for feature extraction purpose,I have read the signal samples using the read from spreadsheet vi and set to the vi for wavelet analysis purpose,my intention is to find the details and approximate coefficients like Matlab,how could i make that one in LabVIEW(extracting the detail coefficients and approximate coefficients and then plotting the detail coefficients vs the sample or time)

thank you for your help.