finding the inverse system (a DSP question)

Feb 27, 2005 1 Replies
A

Hello,



There are 2 signals, X and Y. sampling freq: 50 samples/second. There is a light-blub controlled by an DAC. A transducer(piezo) is used to measure the heat produced. the attachments--> Y is the (input) voltage of the light-blub, while X is the (output) voltage of the transducer.



How can I design a system which transform X into Y?



Thank you!



Edw.


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J

If you are NOT concerned about the lags's or other dynamics, build yourself a look up table. If you use a 8 bit DAC, you'll only need 256 entries.

But if you ARE concerned about lags or other dynamics, you'll need to build an inverse function of your system. A possible solution, but not the only solution is to build yourself an adaptive filter such as a Wiener/LMS filter to invert the transfer function of your system. Check out "Adaptive Signal Processing" by Widrow and Stearns for some very good information.

A very good place to ask questions like this is in comp.dsp. The guys there eat this stuff for breakfast.

Jeff Stout

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