• CMSIS DSP - FFT / RFFT
    Recently I've been trying to implement FFT provided in CMSIS-DSP libraries. And something strange happens - some of output array elements have values below 0. I am using arm_rfft_fast_f32 . According...
  • FFT Computation using CMSIS DSP library
    I have a code that computes FFT using fftpack functions npy_rffti and npy_rfftf . I want to replace them using arm library functions. I have a real signal. I wrote the below code. arm_rfft_fast_instance_f32...
  • CMSIS DSP stage_rfft_f32 function
    Hi, I am exploring the CMSIS DSP library. After playing for a while I have 2 questions: -in case I want to evaluate DFT over bigger data window than 4096 I would need to provide Twiddle Coefficient...
  • CMSIS-DSP: question about FFT and the frequency bin example
    Hi, I hope this is the right place to ask about DSP/FFT. I'm digging deeper into CMSIS-DSP and managed to get the FFT frequency bin example to work on a Cortex-M3. I have a few questions about CMSIS in...
  • CMSIS DSP FFT does not give the correct result when number of points are changed
    I have used the example provided in the CMSIS DSP example for 1024 point FFT. It works and there are no issues. Next I used Matlab to generate 1024 sample points for a 100 Hz sine wave with 10 kHz sampling...