algorithm for Q12 format

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q12 format

hi all,
can anyone share the material or algorithm for converting a flaoting point value in C to a fixed point Q12 - format, as we do in a DSP processor.

i want to know the logic behind how it works ....
 

q12 fixed point

Q12 format for fixed-point numbers means 12 fractional bits 3 integer bits and 1 sign bit. Say you have number x as floating-point (within +_1.0 range), xq12 is given as;

xq12 = round(x*2^12);

I hope it helps.
 

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