NI Home > Community > NI Discussion Forums

LabVIEW

Showing results for 
Search instead for 
Do you mean 
Reply
Member
LMTImoi
Posts: 4
0 Kudos

filtre de signal par la fenêtre rectangulaire ou bien hanning

Salut,
je fait traitement de signal transmis par un échantillon  par labview mais je trouve que les signaux obtenu varient dans mon idée et de filtre mon signal par la fenêtre rectangulaire ou bien hanning
mon question comment filtre un signal par la fenêtre rectangulaire et hanning à partir de labview
le signal et un signal transmis des ondes ultrason dans un échantillon donc signal pas stationnaire
 merci

Proven Zealot
mikeporter
Posts: 5,072
0 Kudos

Re: filtre de signal par la fenêtre rectangulaire ou bien hanning

I tried running your question through google translate, and it didn't do too well. But it appears that you are using windowing on an ultrasonic signal before spectral analysis and are not seeing what you expect.
Remember that windowing is a trade-off. Applying a window to your data can allow you to resolve narrower spectral peaks, but it will distort the amplitude of those peaks. Using no window, or a rectangular window (which is really the same thing) does not distort amplitude but narrow peaks will tend to bleed together.
Hope this helps...
Mike...

Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion

"... after all, He's not a tame lion..."
Member
LMTImoi
Posts: 4
0 Kudos

Re: filtre de signal par la fenêtre rectangulaire ou bien hanning

My question is

how to use the rectangular window and hanning filter for an ultrasonic signal in labview, sample program


thank you

 

Proven Zealot
mikeporter
Posts: 5,072
0 Kudos

Re: filtre de signal par la fenêtre rectangulaire ou bien hanning

You just wire the windowing VI into the array of time-domain data that you are passing to the frequency analysis code you are using.

Mike...

Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion

"... after all, He's not a tame lion..."