linear to logarithmic conversion

Hi,

in my opinion, the first question you should ask yourself is the data format (in linear) and the value range you want to use:

e.g: float, double, fixedpoint, signed/unsigned integer, maybe 7 bits integer and so on.

If you have determined this very first issue you can go on with e.g. Matlab: you could approximate the log curve you need with lookup tables, raw+fine lookup tables and maybe an interpolation, or an algorithmic approach to approximate the log curve with polynomials.

I think there is plenty of information an how to implement this special functionality on the Internet => google, ieee, and so on.

Did you take a sight on opencores.org? Maybe there is a finished core available.

regards,

lestard