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摘要

PROBLEM TO BE SOLVED: To provide a digital filter that enables a high-speed operation with a small amount of circuitry, and that achieves higher accuracy.;SOLUTION: The digital filter can operate runtime processing at a high rate of speed only with table reference so that the filter can meet the limit on the power spectral density with the effective number of bits for the DAC being fewer than in the conventional art. The digital filter gives a sequence pattern that represents directions of positive and negative transitions of the phase that continue over a predetermined number from a certain reference symbol to an adjoining (next) reference symbol, finds one or more interpolate symbols that meet conditions of a predetermined frequency spectrum (band), and a predetermined (range of) amplitude with reference to the given sequence pattern, and stores the found sequence pattern and a phase value and an amplitude value corresponding to the found one or more interpolate symbols in a memory as a lookup table.;COPYRIGHT: (C)2011,JPO&INPIT