• 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...
  • Audio artifacts from CMSIS/DSP Q15 => float => Q15 conversion
    I use CMSIS/DSP library in an audio application. I have issues with the conversions 16 bits PCM (=>) Q15 => float => Q15 (=>) 16 bits PCM (in fact no real conversion between 16 bits PCM and Q15, as I...
  • 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 - 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...
  • 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...