fpga Standard Deviation calculation - any examples?

[yuval_yohai]

Hello,

Im looking for a way to implement 'Moving Standard Deviation' into the FPGA module.

Are there any examples out there?

I'm using cRIO-9012 chassis.

Thanks,

Yuval

[srm@viewpointusa.com]

how many data points are you considering?  since the algorithm requires a pass through all the data for each new data point, it will be cycle consuming.  how fast does it need to run?

[David_L]

I don't know much about the algorithm, but from what I've seen it seems like just a few simple calculations.  It doesn't seem like it would be too tough to implement using the numeric palette calculations. 

http://www.transitionstrading.com/mstd.htm

[srm@viewpointusa.com]

---

stu@viewpointusa.com wrote:
how many data points are you considering?  since the algorithm requires a pass through all the data for each new data point, it will be cycle consuming.  how fast does it need to run?

---

Sorry, the algorithm does NOT require a pass through the system.  is the same calculation as computing the AC RMS value of X which can be computed point by point on a fairly arbitrary set of data.  You do have to keep the set of data around though.  There is a built in calculation of standard deviation pt by pt that will show you an implementation but it is not coded for FPGA.

[dwisti]

I've calculated variance and standard deviation in FPGA using FXP math toolkit.  Attached are the VIs.

[yuval_yohai]

Thanks very much to all of you.

I will look at it today and come back with the results.

Yuval

[srm@viewpointusa.com]

---

dwisti wrote:

I've calculated variance and standard deviation in FPGA using FXP math toolkit.  Attached are the VIs.

---

Whenever i code an FPGA algorithm, i create a test case with known inputs.  I am not sure if you did for this

code or not but i put together a test case that does not produce expected results.  I am not sure if i implemented the 

your code correctly but you can check it out.

[yuval_yohai]

Many thanks Stu. I'll be back with results.

Yuval

[dwisti]

I did have a test project. Here it is.

[dwisti]

Your test vi was wired wrong.  I fixed it.