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CMSIS arm_cfft_q15() roundoff errors

Question asked by Sergei Sharonov on Aug 18, 2015

Hi,

Is anybody using arm_cfft_q15() with Kinetis M4? For FFT length of 512 and a simulated input pure sine wave (first harmonic) I am getting roundoff errors in other output harmonics in the order of 5-6 counts no matter what the input signal magnitude is (obviously except when it is 0). Seems a bit high. Comments/insights appreciated.

Regards,

Sergei

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