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The Period Precise Evaluation of Periodic Waves

Liang Zhiguo Sun Jingyu (Changcheng Institute of Metrology and Measurement, Beijing 100095, China)  
In this paper, a method of precise evaluation on the frequency or period of periodic wave series is introduced, that is the digital filtering and the least mean square sine wave curve fitting. The errors of curve fitting are also discussed. By two group imitation experiments, the correctness and practicability of this method are proved, so the period precise evaluation of periodic waves is realized.
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