RE: FPU-FFT input data

Phillip Jacobs — Wed, 03 Jun 2020 19:46:29 GMT

Thank you Amanda. I think my problem is that I am just using the real number and not the imaginary number (making it 0) Will have to change that.

RE: FPU-FFT input data

Amanda Hsieh — Wed, 03 Jun 2020 06:57:24 GMT

Hi,

[quote user=""]Do I have to change these points to polar form or leave as is and dump the data into the fft function?[/quote]

In the FPU FFT Example, it processes 64 pairs of complex data (real, img). It is important to use proper arm_cfft_sR_f32 structure associated with input/output data length. For example: 128 numbers in input array (64 complex pairs of samples) -> 64 output bins power data -> &arm_cfft_sR_f32_len64. The fft_process() will executes arm_cfft_f32() and arm_cmplx_mag_f32(). Please also see the input format of arm_cfft_f32() and arm_cmplx_mag_f32().

-Amanda H.