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CMSIS DSP FFT length is not enough

Topic last updated 21 Mar 2019, by Peter Marcisovsky. 0 replies
Peter Marcisovsky
21 Mar 2019

Hi,

I have been working with CMSIS DSP FFTs and STM32F746NG (32F746GDISCOVERY) Curretnly, I am using arm_cfft_radix4_f32 with 4096 fft length, but it is not enough for my application (precision 24bit ADC).

Is there any way how to increase the fft length to say, 16k samples? Or is there any technique where you take more samples and perform your fft in more steps to have better resolution?

Thank you.