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arm_cmplx_mag_f32() producing all-zero output
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arm_cmplx_mag_f32() producing all-zero output
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AlaaM
over 1 year ago
Hi,
I'm trying to use arm FFT from the DSP library. The provided example
(arm_fft_bin_example)
is working, but once I use my own sinus wave values, I see an unexpected behavior.
The values in
arm_fft_bin_example_f32.c
look quite small, and looks like they're normalized around 0 mean and 1 std (-0.05 mean and 1.35 std).
My data consists of a sinus wave of 12 bits ADC samples, so the numbers are quite large. The result is that after the call to
arm_cfft_f32()
the processed numbers become even larger, and then
arm_cmplx_mag_f32()
returns all-zero array for the output FFT data.
My question is whether I should pre-process my data (e.g. normalize it) before using the FFT functions, or if there might be anything else that I'm doing wrong that's leading to having all-zero FFT output array.
Thanks in advance
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