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DSPLIB库输入数据Q15格式问题

用DSPLIB库的rfft函数,输入数据要求是short型Q15格式的数据,但是如果输入信号的幅值大于1,怎样用Q15格式呢?需要把输入数据归一化吗?如果归一化,调用rfft之后,怎样计算信号的真实幅值呢?