1. A method for combining digital lookup tables located in an electronic memory comprising: converting, using a processor, the values in a first lookup table from integer to a first set of floating point values the floating point values representing a function of an input variable; filtering, using an electronic circuit, the first set of floating point values to reduce quantization errors; converting, using the processor, the values in a second lookup table from integer to a second set of floating point values, the floating point values representing a function of an input variable; filtering, using the electronic circuit, the second set of floating point values to reduce quantization errors; applying a standard sequence of values as input to the function represented by the first set of filtered floating point values to generate a first transformed standard sequence; applying the first transformed standard sequence as input to the function represented by the second set of filtered floating point values to generate a second transformed standard sequence; and quantizing the second transformed standard sequence to generate a combined lookup table.