Nonlinear function generator having efficient nonlinear conversi

Details Nonlinear function generator having efficient nonlinear conversi Nonlinear function generator having efficient nonlinear conversi

1994-11-21

1996-04-09

Malzahn, David H.

Boots, shoes, and leggings

36471503, G06F 103, G06F 500

Patent

active

055067972

ABSTRACT:
An input value x of floating-point representation is added up with an input value offset by a floating point adder, to be translated to a region where an exponent part is constant. On the basis of an output from the floating point adder, an address decoder generates an address for a lookup table. The lookup table stores only mantissa data in accuracy required for a function value of a necessary nonlinear function. A bit expansion circuit converts a function value read from the lookup table to corresponding numeric data of floating-point representation. The floating point adder subtracts an output value offset and outputs a nonlinear function value of floating-point representation for translating the numeric data received from the bit expansion circuit to its original region. A nonlinear function generator is provided which can efficiently implement nonlinear conversion processing in a digital electronic circuit at a high speed.

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"A VLSI Processor Architecture for a Back-Propagation Accelerator", Yoshio Hirose et al., IEICE Trans. Electron., vol. E75-C, No. 10, Oct. 1992, pp. 1223-1230.
"A Self-Learning Digital Neural Network Using Wafer-Scale LSI", Moritoshi Yasunaga et al., IEEE Journal of Solid-State Circuits, vol. 28, No. 2, Feb. 1993, pp. 106-114.
"Ganglion--A Fast Field-Programmable Gate Array Implementation of a Connectionist Classifier", Charles E. Cox et al., IEEE Journal of Solid-State Circuits, vol. 27, No. 3, Mar. 1992, pp. 288-299.

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