Digital signal processor having instruction set with one or more non-linear functions using reduced look-up table with exponentially varying step-size
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United States of America Patent
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Jun 30, 2015
Grant Date -
Jun 3, 2010
app pub date -
Nov 28, 2008
filing date -
Nov 28, 2008
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Abstract
A digital signal processor and method are disclosed having an instruction set with one or more non-linear functions using a look-up table of reduced size and exponentially varying step-sizes. A digital signal processor evaluates a non-linear function for a value, x, by obtaining at least two values from at least one look-up table for the non-linear function that are near the value, x, wherein the at least one look-up table stores a subset of values for the non-linear function using exponentially-varying step sizes; and interpolating the at least two obtained values to obtain a result, y. A position of a leading zero in the value, x, can be used as an index into the at least one look-up table. The interpolation can comprise, for example, a linear interpolation or a polynomial interpolation. A modulo arithmetic operation can optionally be employed for a periodic non-linear function.
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