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Altera_Forum
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11 years ago

how to choose to truncate signal width

when the signed signal pass through multiply or FIR ,the signal width extend.how should i choose to truncate the signal width . generally,we truncate (LSB)Least Significant Bit ,retain MSB. But,in my...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Usually you would model the filter with fixed point, and then see what kind of accuracy is acceptable. Then you can truncate accordingly. Remember that rounding errors will compound if you have chained filters.