Discrete Cisine Transformation

[estamata]

Hi,
has anyone implemented in esp32 Discrete Cosine Transformation or Discrete Wavelet Transformation ?
i want to extract the coeffs ftom a 1024 or 2048 bit long of raw data sound signal
thank you for your time
M.

[savage]

Take a look at the Espressif DSP library:
https://github.com/espressif/esp-dsp/

I only see complex FFT functions, but you could use those for a DCT.