CMSIS-DSP DC offset problem

Hi everyone,

I am developing a sound acquisition node with MEMS-Microphone and everything works fine(Windowing, Filtering..) except that the FFT output not as it's supposed to be! even it's work and frequencies in the input data is detected good, but imag[0] != 0 why? and it seems that real[0] doesn't represent the DC offset!

Any help?

Thanks in advance!

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