1. A method performed by a digital signal processor for evaluating an x K function for an input value, x, said method comprising: computing Log(x) in hardware; multiplying said Log(x) value by K; and determining said x K function by applying an exponential function in hardware to a result of said multiplying step, wherein one or more of said computation of Log(x) and said 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.