Trigonometeric function generation for use in digital signal pro

Details Trigonometeric function generation for use in digital signal pro Trigonometeric function generation for use in digital signal pro

1990-08-09

1992-09-08

Mai, Tan V.

Boots, shoes, and leggings

364726, G06F 738

Patent

active

051464187

ABSTRACT:
A sequence of N sine and/or cosine values, e.g. for Fourier Transforms, quadrature demodulation or test tone generation, is produced by interpolation from a geometrically-spaced table of initial sine values using a first interpolation formula. After being output, each sine value is replaced in the table by a further calculated value, so the sine table size is kept at M=(Log.sub.2 N)+2 (where N is the number of sine values in the sequence). To avoid round-off errors at widely-spaced interpolations, a second interpolation formula is selectively used in which sine values are interpolated from cosine values. A cosine table is therefore maintained concurrently with the sine table.

REFERENCES:
patent: 4536853 (1985-08-01), Kawamoto et al.
patent: 4718030 (1988-01-01), Tsutsumi
patent: 4870606 (1989-09-01), Sasahara

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