Abstract! This paper introduces several commonly used digital frequency measurement algorithms and their basic principles. It also conducts MATLAB simulation research on direct counting method, phase estimation method, frequency estimation method, Fourier transform method and spectrum estimation. It summarizes the main advantages and disadvantages of various algorithms and provides a reference for designers to select appropriate algorithms for engineering applications. Keywords! Digital frequency measurement & direct counting method & phase estimation method & frequency estimation method & Fourier transform method & spectrum estimation
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