Sine/cosine generator and method

Details Sine/cosine generator and method Sine/cosine generator and method

1995-03-08

1999-11-09

Mai, Tan V.

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

G06F 102

Patent

active

RE0363880

ABSTRACT:
A sine/cosine generator with coarse and fine angles having compressed sine and cosine read only memories (ROMS) by use of symmetry of coarse angles about .pi./4 and, optionally, symmetry of fine angles about 0. The output of the ROMs directly feed multiplexers for utilization of the compressed storage. Addressing of complementary coarse angles is with one's complementing of the address and of complementary fine angles is with two's commplementing of the address. Fine sines and cosines are stored in recoded version for direct use in multipliers for computations using the sum of angles formulas.

REFERENCES:
patent: 4077063 (1978-02-01), Lind
patent: 4486846 (1984-12-01), McCallister et al.
patent: 5073869 (1991-12-01), Bjerede
patent: 5113361 (1992-05-01), Damerow et al.

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