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Francis-Kabrel
2017-06-07, 04:52
Hello everyone,

I come to you following a problem of USB Audio output on Raspberry Pi 3 with pCP 3.11.
I plugged a USB key on my Raspberry Pi 3, integrated 24bit / 192kHz files to my LMS since the latter, then connected all to my Alientek D8 Amplifier on USB.

Problem: The Alientek puts me that it reads a 48kHz file, and not 192kHz when I launch the music.

Question: Is the USB Audio Ouput mode limited in terms of sampling rate? Did I miss a particular setting?

Thank you in advance.

bakker_be
2017-06-07, 05:42
Hello everyone,

I come to you following a problem of USB Audio output on Raspberry Pi 3 with pCP 3.11.
I plugged a USB key on my Raspberry Pi 3, integrated 24bit / 192kHz files to my LMS since the latter, then connected all to my Alientek D8 Amplifier on USB.

Problem: The Alientek puts me that it reads a 48kHz file, and not 192kHz when I launch the music.

Question: Is the USB Audio Ouput mode limited in terms of sampling rate? Did I miss a particular setting?

Thank you in advance.

Hello,
what kind of USB key? A DAC?

Francis-Kabrel
2017-06-07, 06:08
Hello,
what kind of USB key? A DAC?

Hello!
My music is stored on a basic USB key (8GB).
I don't have a DAC, my Alientek D8 is a digital amplifier.

Man in a van
2017-06-07, 13:14
which version do you have


Sampling Rate:44.1Khz-192Khz XMOS/USB/Fiber/Coaxial
44.1Khz(PCM270USB) 96Khz(Analog RCA)



it will also depend (I think ) on the drivers being supported bu pCP.

have you tried a different output in the Dropdown selection box.

Francis-Kabrel
2017-06-08, 00:56
which version do you have



it will also depend (I think ) on the drivers being supported bu pCP.

have you tried a different output in the Dropdown selection box.

Hello!
I have the USB XMOS version of the Alientek D8.

Do you know which drivers support pCP? Would not it support the XMOS?

Which output in the drop-down menu do you speak exactly?
Here I select USB Audio:
https://img4.hostingpics.net/pics/22628720170608095343.jpg (https://www.hostingpics.net/viewer.php?id=22628720170608095343.jpg)

Man in a van
2017-06-08, 02:01
Save the usb and reboot then go back to the page and select

"Output Setting"

There should be one or two options to select.

Choose one, save and reboot.

See how you go.

Try another if the first choice does not work


Ronnie

If LMS is on the pCP install, don't forget to make sure the usb stick is mounted correctly

22856

Francis-Kabrel
2017-06-08, 02:28
Thanks for your answers, I try tonight with the 2 settings in "Ouput Setting" and I will tell you the results.

I think my USB drive is mounted correctly. I followed the normal steps with "Set USB Mount" etc ... respecting the warnings that you show on your screenshot.

bakker_be
2017-06-08, 03:03
Thanks for your answers, I try tonight with the 2 settings in "Ouput Setting" and I will tell you the results.

I think my USB drive is mounted correctly. I followed the normal steps with "Set USB Mount" etc ... respecting the warnings that you show on your screenshot.

Hello,
somthing strange here ... This post (http://forums.slimdevices.com/showthread.php?107269-PiCorePlayer-FDA-Amplifier-(Alientek-D8)/page2) leads me to believe you already have working sound from your PCP + Alientek. So the issue would be with correctly recognising the files on your USB key? This has nothing to do with USB Audio Output, just set that back to what you had previously, and check if LMS sees the files on your stick. You can also identify if the correct info is recognized by LMS:
22857

Francis-Kabrel
2017-06-08, 04:42
Hello,
somthing strange here ... This post (http://forums.slimdevices.com/showthread.php?107269-PiCorePlayer-FDA-Amplifier-(Alientek-D8)/page2) leads me to believe you already have working sound from your PCP + Alientek. So the issue would be with correctly recognising the files on your USB key? This has nothing to do with USB Audio Output, just set that back to what you had previously, and check if LMS sees the files on your stick. You can also identify if the correct info is recognized by LMS:
22857

Hello !
Then all my files are well listed in my LMS (I can make a screenshot tonight), and indicates the 24Bit / 192kHz in the properties of my files.
I can read absolutely all the files present on my USB key without any worries.

The one and only worry is the 48kHz present on the display of the Alientek, while the files read are 192kHz.
I'm afraid that the USB Audio output converts the files to 48kHz before sending them to the Alientek.

Francis-Kabrel
2017-06-08, 12:15
Save the usb and reboot then go back to the page and select

"Output Setting"

There should be one or two options to select.

Choose one, save and reboot.

See how you go.

Try another if the first choice does not work

It's okey ! With this setting :
https://img4.hostingpics.net/pics/75064022ok.png (https://www.hostingpics.net/viewer.php?id=75064022ok.png)

Thanks a lot for your help ! Files 24Bit/192kHz are recognized without problems ! :)

Besides, does anyone have an explanation as to what command to read the files correctly: iec958: CARD=Audio,DEV=0?

Francis-Kabrel
2017-10-10, 04:42
Besides, does anyone have an explanation as to what command to read the files correctly: iec958: CARD=Audio,DEV=0?

Can anyone enlighten me that this command works and not others? :)