HiFiBerry DAC+ Pro about select clocks


My usage environment is DAC+ Pro on a RPI 3 Model B,distribution is volumio2.295.

when I played the sound source of 24 bit 352.8KHz or DSD2.82 MHz (PCM conversion), I noticed that the playback speed was fast. Also, when checking cat / proc / asound / · · from the command line during the above playback.

root@volumio:~# cat /proc/asound/card1/pcm0p/sub0/hw_params
format: S24_LE
subformat: STD
channels: 2
rate: 352800 (384000/1)
period_size: 16384
buffer_size: 65536

In addition, at this time, the master clock selected by Hifiberry dac + pro was 24.576MHz (I added LEDs to each crystal)This symptom is the same in volumio2.246.

This is a guess, if DAC's 22.5792MHz crystal will be selected , I think it will play normally, but I think the output rate 352800(384000/1) is involved.

This may be a problem on the distribution side, but please let me know if there are any useful countermeasures.

Best regards, Thank you






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