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controlSUITE中DSP库的函数void RFFT_f32_phase (RFFT_F32_STRUCT *),其输出应该在RFFT_F32_STRUCT结构体中的float32 *PhaseBuf指针中,但是需要多大的数组去存储结果?(FPU DSP Software Library USER’S GUIDE 5.16 Real Fast Fourier Transform Phase例程中没有定义该数组),另外其计算后相位的值怎么使用具体意义是什么?谢谢!