Numerically controlled oscillator: Difference between revisions

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|country-code =US
|patent-number =7437391
}}</ref> trigonometric approximations<ref name="Grzeg">{{ cite web | first = Grzegorz | last = Popek | first2 = Marian | last2 = Kampik | title = Low-Spur Numerically Controlled Oscillator Using Taylor Series Approximation | url = http://mechatronika.polsl.pl/owd/pdf2009/030.pdf | date = October 2009 | work = XI International PhD Workshop, | publisher = Silesian University of Technology | ___location = Gliwice, Poland }}</ref> and methods which take advantage of the quadrature symmetry exhibited by sinusoids.<ref>{{Citation
|inventor-last =Mccallister
|inventor-first =Ronald D.