Low frequency AC waveform generator

Details Low frequency AC waveform generator Low frequency AC waveform generator

1983-11-22

1986-07-08

Harkcom, Gary V.

Boots, shoes, and leggings

364817, 364858, 328 14, G06G 726

Patent

active

045997039

ABSTRACT:
Low frequency sine, cosine, triangle and square waves are synthesized in circuitry which allows variation in the waveform amplitude and frequency while exhibiting good stability and without requiring significant stabilization time. A triangle waveform is formed by a ramped integration process controlled by a saturation amplifier circuit which produces the necessary hysteresis for the triangle waveform. The output of the saturation circuit is tapped to produce the square waveform. The sine waveform is synthesized by taking the absolute value of the triangular waveform, raising this absolute value to a predetermined power, multiplying the raised absolute value of the triangle wave with the triangle wave itself and properly scaling the resultant waveform and subtracting it from the triangular waveform itself. The cosine is synthesized by squaring the triangular waveform, raising the triangular waveform to a predetermined power and adding the squared waveform raised to the predetermined power with a DC reference and subtracting the squared waveform therefrom, with all waveforms properly scaled. The resultant waveform is then multiplied with a square wave in order to correct the polarity and produce the resultant cosine waveform.

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patent: 3697877 (1972-10-01), Godfrey
patent: 3982189 (1976-09-01), Brooks et al.
patent: 4415860 (1983-11-01), Lo

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