Generator of exponential function

Abstract

Abstract PURPOSE:To obtain simply an exponential function value, by generating the exponential function value corresponding to an input digital signal in the form of a digital signal by a storage element of a comparatively small capacity and with accuracy approximately equal to that of a conventional process. CONSTITUTION:An input signal (a), i.e., a parallel digital signal is decomposed by a decomposer 1 into high-order and low-order word signals (c) and (b). The signal (c) is applied to a storage element 2 which stores previously the exponential function value corresponding to the address value. Then the exponential function value e{=exp(c)} corresponding to the signal (c) is obtained as an output of the element 2 and applied to a multiplier 3 and an adder 4, respectively. The multiplier 3 calculates a product of signals (e) and (b), and this product signal (d) is added with the signal (e) by the adder 4 to obtain an output signal (f). This signal (f) is equal to the exponential function value of the signal (a).

Inventors

• 👤 Makoto Ishii
• 👤 石井　眞

Bibliographic Details