topic CMSIS arm_cfft_q15() roundoff errors in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/CMSIS-arm-cfft-q15-roundoff-errors/m-p/448651#M26554 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>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.</P><P>Regards,</P><P>Sergei</P></BODY></HTML> Tue, 18 Aug 2015 20:42:28 GMT sergeisharonov 2015-08-18T20:42:28Z CMSIS arm_cfft_q15() roundoff errors https://community.nxp.com/t5/Kinetis-Microcontrollers/CMSIS-arm-cfft-q15-roundoff-errors/m-p/448651#M26554 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>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.</P><P>Regards,</P><P>Sergei</P></BODY></HTML> Tue, 18 Aug 2015 20:42:28 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/CMSIS-arm-cfft-q15-roundoff-errors/m-p/448651#M26554 sergeisharonov 2015-08-18T20:42:28Z