Method of and apparatus for composing approximate sinusoidal wav

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328 14, G06F 1534

Patent

active

041308760

ABSTRACT:
A sinusoidal waveform is approximated by alternately connecting downward opening parabolic curves and upwardly opening parabolic curves at their open ends. A variable input digital representation changing at a certain rate is subjected to a coordinate conversion and squaring operation to provide amplitude samples to constitute a quasi-sinusoidal waveform. All the operations are performed through logical circuits without using a read only memory.

REFERENCES:
patent: 3033453 (1962-05-01), Lode
patent: 3657657 (1972-04-01), Jefferson
patent: 3925654 (1975-12-01), Roantree et al.

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