This article main research content is three AM signal demodulation algorithm, digital orthogonal demodulation algorithm, namely envelope demodulation algorithm, smooth the discrete Fourier transform (DFT) demodulation algorithm, gives the corresponding demodulation principle, formula deduction and the system module.Using MATLAB simulation using three methods respectively to a signal demodulation, and comparing the results, the advantages and disadvantages of three kinds of methods and applications are presented.

AM signal.docx

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