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Old 16th January 2013, 08:20 AM   #2091
nikkov is offline nikkov  Russian Federation
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Quote:
Originally Posted by RayCtech View Post
...
This is when MPD plays to both the internal I2S and two USB devices.
...
How you using internal I2S on CubeBox? With external DAC?
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Old 16th January 2013, 02:26 PM   #2092
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Quote:
Originally Posted by linuxworks View Post
the lesson, to me, is that engines (pc computers) will come and go. the rpi is teh new hotness right now, but before that I remember the seagate dockstar, the pogoplug, some other plastic boxes that could run a scaled down linux.

best would be to not be too tied to any one of them. let the tech mature as it will, over time. assume a usb interface and as that gets 'better' your solution will get better.
Yes yes, I remember all of those gadgets sadly just to fill the precious earth in a short time. Thank you for clearing my air. And now I finally have a USB device that makes digital bearable and can be connected to the latest fashion. Is it ironic that I can use a computer and USB, neither of which I love, to listen to Beethoven.
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Old 16th January 2013, 07:34 PM   #2093
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Quote:
Originally Posted by nikkov View Post
How about glitches on 192/24 files? I tried play 192/24 from network storage with connected USB keyboard and heared frequently glitches. On 44100 all OK
I don't own any 192k material, so I haven't tested. 96k was my goal. For the sake of science, I will make up some 192k test files to stress test the system, and see if removing the keyboard makes a difference to the results.

Quote:
Yes yes, I remember all of those gadgets sadly just to fill the precious earth in a short time... finally have a USB device that makes digital bearable
I suppose I agree, hence why I spent 4x as much money on Borge's USB DAC as I did on the R-Pi. It should be easy to drop in some other board, either ARM or x86, running Linux later. Hopefully the success of the Pi will inspire lots of competitors with USB that works

I totally sympathise with his design goals and so far I've been very pleased with the sound quality.

PS: Why use "IRQs per second" as a performance metric? Surely the interrupt rate doesn't matter, as long as you don't miss any of them. I expect there will be some critical interrupt rate beyond which the system falls apart, but any rate below that should work fine.

I thought the choice of a 16-sample packet for the UAC2 mode was a little small, but I assumed there was some other good reason for it.
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Last edited by scopeboy; 16th January 2013 at 07:37 PM.
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Old 16th January 2013, 08:24 PM   #2094
greggp is offline greggp  United States
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For some sample files, go here: High Resolution Music DOWNLOAD services .:. FLAC in free TEST BENCH
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Old 16th January 2013, 10:27 PM   #2095
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Thanks for the link! I chose the Mozart's Violin Concerto no.4. I heard one definite glitch with the keyboard connected: a distinct pop during the quiet solo passage near the end, that wasn't there on rewinding.

With the keyboard disconnected, I thought I heard a few slight stutters, but I couldn't positively identify any of them. Could have been underruns, could have been edits in the recording or noises from the musicians. Once I got the "metallic noise" on disconnecting the keyboard, but it resolved itself after a few seconds.

Setting these issues aside, the recording is beautiful and really shows off the performance of the DAC.

I don't think I can do any better without hooking up a SPDIF output and capturing the digital data for comparison to the original. It won't be the first time that I "heard" things during a critical listening session that weren't actually there. :-)
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Last edited by scopeboy; 16th January 2013 at 10:30 PM.
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Old 17th January 2013, 01:51 AM   #2096
nikkov is offline nikkov  Russian Federation
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Quote:
Originally Posted by scopeboy View Post
...
With the keyboard disconnected, I thought I heard a few slight stutters, but I couldn't positively identify any of them. Could have been underruns, could have been edits in the recording or noises from the musicians. Once I got the "metallic noise" on disconnecting the keyboard, but it resolved itself after a few seconds.
...
scopeboy what firmware version AW you tested? I used last firmware with BÝrge changes and heared on 192/24 files glitches and "metallic noise" frequently.
I checked CPU loading:
44k < 10% total
192k < 30% total

I think that this is maybe firmware problem. Does anyone tested the latest firmware with 192/24 on linux desktops?
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Old 17th January 2013, 02:25 AM   #2097
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Quote:
Originally Posted by nikkov View Post
scopeboy
I think that this is maybe firmware problem. Does anyone tested the latest firmware with 192/24 on linux desktops?
Just listened with my i7 Sandy Bridge laptop with latest Borge firmware :-)

192/24 no problems at all. (In fact, no problems on Linux platform using mpd for a long long time with older versions of firmware.)


Alex
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Old 17th January 2013, 08:53 AM   #2098
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I'm using whatever firmware Borge shipped out on the unit last week.

I fiddled with the Pi's /boot/config.txt in an attempt to disable CPU clock management and run it at full speed all the time. I wonder if that is helping. If you're interested, I'll post details in the Raspberry Pi thread this evening.
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Old 17th January 2013, 09:12 AM   #2099
nikkov is offline nikkov  Russian Federation
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Quote:
Originally Posted by scopeboy View Post
If you're interested, I'll post details in the Raspberry Pi thread this evening.
Yes, I'm interested what result you get
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Old 17th January 2013, 03:45 PM   #2100
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Scopeboy do please let us know your experiences with RPi and AW. Even reliable 96/24 with a skip every ten minutes is useful to me. My hope is just simple and smooth digital music, like an old friendly NAD turntable. Let us know where you post.. cheers!
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