Apparatus for computing exponential and trigonometric functions

Details Apparatus for computing exponential and trigonometric functions Apparatus for computing exponential and trigonometric functions

1998-02-23

2000-04-25

Ngo, Chuong Dinh

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

708606, G06F 102, G06F 738

Patent

active

06055553&

ABSTRACT:
A 64-bit precision digital circuit for computing the exponential function and a related 64-bit precision digital circuit for computing sine and cosine, each circuit comprising a master circuit and a slave circuit. The master circuit computes the remainders x.sub.i for every "logical" iteration i using fast, low-precision circuit, thereby accumulating temporary errors. Only at the end of every 8 i's, which marks the end of a "physical" iteration, is a complete and fast correction to the accumulated errors performed. The slave circuit computes quantities called the y.sub.i 's, which will eventually converge to the desired output.

REFERENCES:
patent: 4225933 (1980-09-01), Monden
patent: 4956799 (1990-09-01), Nakayama
patent: 4979139 (1990-12-01), Nakayama
patent: 5041999 (1991-08-01), Nakayama

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