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FFT数据结构体是否有误？ #138

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TheOnlyoe opened this issue Feb 7, 2023 · 0 comments

TheOnlyoe commented Feb 7, 2023 •

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BUG REPORT

BUG REPORT

FFT数据结构体实部与虚部顺序不对应

根据寄存器手册，SDK中的数据模式为64bit，虚实交替（RIRI），但是fft.h中的结构题定义顺序确是(IRIR)，在虽然不影响FFT对结果影响不大，因为大多数应用中会对结果求绝对值，但是如果进行IFFT，则无法恢复成原始数据。

typedef struct _complex_hard
{
    int16_t real;
    int16_t imag;
} complex_hard_t;

typedef struct _fft_data
{
    int16_t I1;
    int16_t R1;
    int16_t I2;
    int16_t R2;
} fft_data_t;```


### Actual behavior
在交换fft_data_t结构体中虚实顺序为RIRI后，可以正常IFFT可以正常恢复到原始数据

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