Method for composing lookup table and searching index thereof

Details Method for composing lookup table and searching index thereof Method for composing lookup table and searching index thereof

2011-05-17

2011-05-17

Malzahn, David H (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

07945609

ABSTRACT:
A method for composing a lookup table and searching indexes thereof is provided. The method includes the steps of: a) composing a lookup table using a symmetry of a sine and a cosine function; b) changing and setting a gain of a DCO by reflecting a lookup table size in the DCO; c) transforming an absolute value of a DCO output to an integer value; d) determining a range of the integer value of the DCO output; e) searching indexes of a sine and an cosine function according to the range of the integer value of the DCO output; and f) correcting a sign of a lookup table value corresponding to the searched index of the sine function and a sign of a lookup table value corresponding to the searched index of the cosine function according to the range of integers of the DCO output.

REFERENCES:
patent: 4169246 (1979-09-01), Schriber et al.
patent: 5467294 (1995-11-01), Hu et al.
patent: 6937671 (2005-08-01), Samarasooriya
patent: 2002/0065861 (2002-05-01), Kim et al.

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