• CFFT AND RFFT using CMSIS DSP library
    Hi, I am currently trying to use the CMSIS DSP library for finding the frequency bin. I have used both  CFFT and RFFT function to compute the frequency bin of input signal. My input data is of 128 samples...
  • Feature request: add Windowing functions to CMSIS-DSP
    CMSIS-DSP offers some functions to perform FFT (Fast Fourier Transform). An usual approach, before a FFT, is to apply a window, for example to reduce leakage effect. A lot of different window have...
  • CMSIS-DSP: CFFT with Q15, wrong output
    Hi, I changed the CMSIS-DSP frequency bin example to Q15 format (or at least I'm trying to do so), but I'm getting wrong results. My changed code: /* =================================================...
  • CMSIS DSP RFFT - too much cycles
    Hi, I use the CMSIS DSP library to calculate a f32 RFFT with a block size of 1024 . For this it takes 262823 cycles. I read in the white-paper that it should take 55538 cycles. Because of the measurement...
  • 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...