Sound level LAFMax

We strive to get LAFMax (the level of measured weighted maximum noise with a fast time weighting) of recorded sound intensimetrie.  We sampled in two different ways. A game took in a second blocks to 25.6KS / s and the other method is to get a single 20 second block at the same sample rate.

My thought was to run a loop that takes out time to 3200 samples each, gets Leq and keeps track of the maximum value found until the entire block has been analyzed.  For the sample blocks a second, I would have to use up all the blocks of 20.

My problem is that I am very new to LabVIEW programming and I have very little time to devote to learning until I need these results.  If pointers would be greatly appreciated.

Thank you

Hi arathbun,

Just to make sure I understand, you are or have already all your data. Now, you want to implement a simple program that will go through all that and follow the max value found of this. Ultimately, this will give the max value of all data, including all the twenty blocks correct?

Also, I believe that it is in fact going to all be developed in LabVIEW? SignalExpress does not provide a lot of data control, it is ideal for simple signals but more complex applications, that's a bit beyond its capabilities.

If you are new to LabVIEW, it would be worth some time by reading some of the simple tutorials to familiarize yourself with the environment and tools.

http://www.NI.com/academic/students/learnlabview/

From a high-level perspective, looks like you need a loop for to browse your data sets and use a shift register to store an integer value for the max. Your inner loop would take a numeric value and compare it to the current maximum, then select whichever is greater than the new max. You can also store your information in an array and use the min/max properties to get similar information and faster results.

I hope you'll get pointed in the right direction. If you are indeed using LabVIEW, I would recommend that you post in the forums of LabVIEW you will get better more applicable to your questions support.

Kind regards

Tags: NI Products

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