利用Vivado的 FFT IP 核估计信号的幅度和频率
1、频率估计：计算公式：m_axis_data_tuser* fs/COUNT=82*250M/1024= 20.0195MHz
2、幅度估计：如果输入的是复信号，最后输出的值是信号幅度的有效值。如果输入的是实信号，最后输出的值是信号幅度的有效值的一半。
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