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Altera_Forum's avatar
Altera_Forum
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9 years ago

Exponential function in vhdl

hiii I want to implement exp(x.^2) in VHDL for synthesis. Can any one suggest how to do it. Here x is in signed format and i want result in fixed point arithmatic i.e. without rondoff operation....
Altera_Forum's avatar
Altera_Forum
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9 years ago

If not function then should I write any package for exp. Sorry I havent written any lookup table before so I dont know. And actually I want to design a Gaussian filter with variable window size & sigma value. For that I am using two 1D gaussian.

So the part I want to impliment is

Gauss= exp^(-(x^2)/2*(sigma)^2);

here sigma will vary from 0.1 to 5.

and x is a vector =[-2 -1 0 1 2] for length equal to 5. I want to vary length also. How to do it.please help me with this. If you know any book for these type of operation then please suggest.