Apparatus and method for calculating an exponential...

Details Apparatus and method for calculating an exponential... Apparatus and method for calculating an exponential...

2005-06-21

2005-06-21

Ngo, Chuong Dinh (Department: 2124)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S277000

Reexamination Certificate

active

06910059

ABSTRACT:
An apparatus for calculating an exponential calculating result for a base 2 floating-point number comprises a transforming device, K exponential tables and a multiplier. The transforming device receives the floating-point number, transforms the floating-point number to an integer part and a fractional part and outputs the integer part and the fractional part. The fractional part is an N-bit number and divided into K parts which have N1, N2, . . . , NKbits respectively, wherein N=N1+N2+ . . . +NK. Each of the exponential tables receives one of the K parts divided from the fractional part and outputs a result. The multiplier receives all results from the exponential tables and outputs a mantissa. The integer part outputted form the transforming device is an exponent. The mantissa, the exponent and a sign whose value is 0 is used to represent an exponential calculating result which is represented in the following format: (−1)Sy·2Ey·my, where Syis the sign whose value is 0, Eyis the integer part, myis the mantissa and 1≦my<2.

REFERENCES:
patent: 5365465 (1994-11-01), Larson
patent: 6178435 (2001-01-01), Schmookler
patent: 6480873 (2002-11-01), Inoue et al.

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