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Altera_Forum
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14 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...
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Altera_Forum
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14 years ago

Apologies to Dave

if I understood the original post, you want 0~579 represented as

-1 ~ +1 onto 16 bits signed. Here is my magic formula:

y = x*113 - 32767 ... thats all

Explanation:

y = x * (2^16-1)/579 - 32767.5

= x*113 - 32767

accuracy is affected by value 113 and losing .5 of 32767.5 but can be improved by multiplying by larger than 113 then shift dividing.