amdf - how to implement

[moyo]

Hi all
Im a beginner in LabVIEW. Can anyone help me and told me how to implement AMDF( average magnitude difference function) in LabVIEW? In matlab solution will be also helpful!

Thanks a lot for any help

[GerdW]

Hi moyo,

this seems to be an example for "how to learn LabView" Please look at the examples that come with LabView, especially those for array operations.

The attached vi is made in LV7.1. I hope I understood that formula right. At the moment there is no error checking, the array size limits should be tested for a full version

Message Edited by GerdW on 08-09-2007 09:31 AM

[moyo]

Thanks a lot for help.
I havent explain what i mean exactly:) This what You have written is just a amdf formula. if i operate on table its simple to implement this method but the problem appear when i try analize "in hot" wave from microphone! mayby You know whether is it any way to operate on wave from microphone without table? or i have to write wave in the table and after that operate on it (use amdf)?

Thanks for help

[GerdW]

Hi moyo,

what do you mean by "table"? Are you talking about an array?
The input for the amdf function is an array. A waveform is a cluster consisting of 2 numerics (t0, dt) and an array of values (y).
Just use the "get waveform components" to get the y-array and feed it to the amdf function...

[moyo]

hi GerdW
thanks a lot for help
I tried to do what You suggested but something doesnt work.  is calculated amdf but i couldnt obtain a graph.
i attach this vi so if You could and hava a time to chect it ... ill be tahnkful

once more time hanks for help!!

[moyo]

hi GerdW
this some case of my idea. first i write wave to file and neft i load it into array and operate on it (make amdf). Could you check whether is it correct?

Thanks

[GerdW]

Hi moyo,

it seems you're running a German Windows That's why I changed your vi a little bit.
But beside of this the vi seems to be ok for me.

[moyo]

Thanks a lot once more time

You were very helpful:) Could i write to You if i have any questions?

good luck

[GerdW]

Hi moyo,

asking here in the forum gives much more answers - especially as I'm not always having time to answer