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Altera_Forum
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15 years ago

Number Scaling

Hi, What is the most efficient way to scale numbers into the range of -1, 1 in Verilog using Cyclone II? That is the fastest code with least resources? are there any free IP cores from Altera o...
Altera_Forum's avatar
Altera_Forum
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15 years ago

Hi Dave,

Thanks ..

The thing is that I have a random Integer input in the 0 - 579 range, without any fractions, simply integers :) ...(xmin-xmax)

This need be scaled to the -1 to 1 range (ymin-ymax) following this rule

y = (ymax-ymin)*(x-xmin)/(xmax-xmin) + ymin;

In my application it is:

y = (2*x)/579-1

So based on what you said, to implement the above formula, all I need to do is shift my integer 10 bits to the right?? and then subtract one?

Note that the following Hardware stages are in signed fixed point format with <S, M, N> = <1 sign,5 integer,10 fraction>, is the result readily available for use in the following stages?? or scaling is further needed?

Thanks