Method and device for generating an output signal as a mathematical function of an input signal

摘要

A device ( 1 ) for generating a digital output signal y_LOG(k)/K) as a mathematical function of a digital input signal (x_LOG(k)) includes a level-changing device ( 6 ), which by amplifying or attenuating the input signal (x_LOG(k)) generates a first intermediate signal (A) that falls within a compressed argument range of the mathematical function and a correction signal (shift_LOG) dependent on the amplification or attenuation of the input signal (x_LOG(k)). Tabulated function values of the mathematical function are stored at or between indices in a storage device ( 11 ). The tabulated function values (B 1 ) are read from the storage device ( 11 ) in dependence on the first intermediate signal (A), and a second intermediate signal (B) is generated in dependence on the read tabulated function values (B 1 ). The correction signal (shift_LOG) is subtracted from the second intermediate signal (B) in a subtractor ( 12 ) to yield the digital output signal y_LOG(k)/K).