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 (B1) 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 (B1). 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).