METHOD AND DEVICE FOR GENERATING OUTPUT SIGNAL AS MATHEMATICAL FUNCTION OF INPUT SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a computer program that can determine a function value to be a base of an output signal with high accuracy with the small capacity of a storage device for a function table to generate a digital output signal as a mathematical function of a digital input signal.;SOLUTION: This device (1) includes a level changing device (6) amplifying or attenuating the input signal xLOG(k) to generate a first intermediate signal A that falls within a compressed argument range of the mathematical function, and a correction signal shiftLOG dependent on the amplification or attenuation of the input signal xLOG(k). Tabulated function values of the mathematical function are stored between indices in a storage device (11). The tabulated function values B1 are read from the storage device (11) in dependence on the first intermediate signal A to generate a second intermediate signal B. The correction signal shiftLOG is subtracted from the second intermediate signal B in a subtractor (12) to yield a digital output signal yLOG(k)/K.;COPYRIGHT: (C)2003,JPO