function using reduced look-up table
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United States of America Patent
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Dec 8, 2015
Grant Date -
Aug 5, 2010
app pub date -
Jan 30, 2009
filing date -
Jan 30, 2009
priority date (Note) -
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Abstract
A digital signal processor is provided having an instruction set with an xK function that uses a reduced look-up table. The disclosed digital signal processor evaluates an xK function for an input value, x, by computing Log(x) in hardware; multiplying the Log(x) value by K; and determining the xK function by applying an exponential function in hardware to a result of the multiplying step. One or more of the computation of Log(x) and the exponential function employ at least one look-up table having entries with a fewer number of bits than a number of bits in the input value, x.
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