1.15 data format - how additions and subtractions are done?

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efundas

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1.15 data

In the 64 point FFT I am using 1.15 fixed data format to represent. Can anyone help me out to with how addition and subtractions are done in 1.15 fixed data format.
Thanks in advance
 

Re: 1.15 data format

Hi

Q15 format addition and subtraction is same as 2's complement format.But multiply is different. when we multiply two Qx and Qy the result is Q(x+y) and two sign bit.

Regards
 

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