I connected the analog audio output to a speaker and played an audio file with sampling rate of 15625.
when I measure the sound coming out of the speaker I can see that the same sound is duplicated from the right and the left of the sampling rate.
the same phenomenon does NOT happen when I send audio through HDMI.
how can I fix the analog output?
in the image you can see in red the analog audio and blue the HDMI output audio: