Third Octave Averaging

[Alv]

Hello, I'm acquiring multiple channels of acoustic data into a 1/3 octave vi. Is there a way I can control the number of averages it takes. Thanks, Scott

[dsb@NI]

Do you want to average for a specific amount of time? If so, compute the number of blocks you need to acquire using

T_avg = (# blocks to avg)*(samples per block)/(sample rate)

restart averaging after you have hit the required averaging time.

Be sure to allow sufficient time for the octave filters to settle before you start averaging.

[Alv]

Doug thanks for responding. I want to average for a specific number of times the vi takes data, say 20 averages. I'm new to Labview, so wiring this isn't clear to me right now. Is there an example were this is done?

[chericks1]

Dear Alv,

Thank you for contacting National Instruments.

To address your question, there are many tutorials and examples on third octave analysis if you go to ni.com/support. On the left side of the page, select Troubleshooting, and then KnowledgeBase. Search all entries for topics such as "1/n octave" or "third octave" and you'll find a lot of material.

Let me know if you have any further questions or if this does not resolve your issue.

Thanks again and have a great day!

Chad AE
Applications Engineer

[Alv]

Chad, I was not successful in finding info on the 1/n or third Octave averaging. i'm sure this has been asked before. Not sure where to go on this.