The improved method of compressing look up table for reducing memory and non-linear function generating apparatus having look up table compressed using the method and the non-linear function generating method

摘要

PURPOSE: An improved look-up table compressing method, an apparatus and a method for generating a nonlinear function having a look-up table compressed using the same are provided to reduce the number of memories. CONSTITUTION: A nonlinear function generator(20) includes an analyzer(30), a memory(40) and a calculator(50). The analyzer calculates analysis information including an address from an X coordinate and outputs the analysis information. The memory includes a look-up table(41) and outputs a Y coordinate value corresponding to the address. The look-up table is stored in an address to which a plurality of Y coordinates value that are extracted at a predetermined step coordinate interval are designated. The calculator calculates an approximate value of a Y coordinate corresponding to the input X coordinate from the analysis information and the Y coordinate value.