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Twisted Pear Superior quality electronic kits

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Old 23rd June 2014, 12:52 PM   #801
jrling is offline jrling  United Kingdom
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Default Software

Quote:
Originally Posted by John Luckins View Post
In the conclusion to this Dangerous Prototypes post on its page 2, the author states:

"To me they (the jitter/phase noise results) point at software as being the issue rather than hardware. So my hypothesis now would be that the "phase noise" seen in all my plots up to now might be mostly software related. Even the Raspberry Pi stuff could just be the software."

He says this after he has tried adding low noise clocks to the BBB and found no significant improvement. Any improvement could have been masked by the audio s/w and data faults in Linux.

Before I read this I was contemplating fitting an improved clock/oscillator to my Rpi but now I don't think this is alone on the critical path to improvement. Might the same be true for the Botic.

John
Hi John

I read the article with interest, but am not sure what software it is that he is referring to?

Is it Squeezelite or some other software that I don't realise is involved in BBB? He seems to indicate that aplay in Linux can be transparent pass through.

Jonathan
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Old 24th June 2014, 05:07 PM   #802
miero is offline miero  Czech Republic
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Today, I've received a gift from a Premier Farnell's manager I never heard about. He sent me a brand new element14 BeagleBone Black, as a replacement for a board I've damaged lately and he included also handwritten message with compliments. Thanks a very much!

In these days I'm trying to prepare Botic driver with multichannel and DSD support (no I2C control yet, sorry). The new kernel 3.15.1 seems to be faster than previous one, but there are still some issues to be resolved.

For example I'd like to examine a issue reported by brian at dangerousprototypes.com. I can easily reproduce that when playing 4 channels at 192kHz rate. In such case 3rd and 4th channels has frequent dropouts. The question is if that can happen also with <=96kHz and if that can be detected and prevented.

Maybe this week, but more probably in the 2nd week of July.
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Old 24th June 2014, 06:52 PM   #803
miero is offline miero  Czech Republic
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I've wrote false statement in the last post...

With disabled SPDIF autodetection and maximum DPLL the BBB with internal oscillator seems to plays 8 channels of 192kHz 32bit data well.
Also 4 channels of DSD64/DSD128 are fine too.

However with the 384kHz there is static noise in the sound, but I hope this one can be solved too.
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Old 24th June 2014, 07:15 PM   #804
miero is offline miero  Czech Republic
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And another great news follows...

With new kernel the BBB is able to resample 44.1kHz to 48kHz at SoX VHQ under 90% load when playing FLAC/MP3/OGG file from NFS using command line play command (SoX).
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Old 24th June 2014, 08:57 PM   #805
PET-240 is offline PET-240  Australia
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And if your music is in .wav?

Glad Farnell helped out!

Thanks again miero!

Chuz,

Drew.
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Old 24th June 2014, 09:39 PM   #806
Coris is offline Coris  Norway
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Quote:
Originally Posted by miero View Post
Today, I've received a gift from a Premier Farnell's manager I never heard about. He sent me a brand new element14 BeagleBone Black, as a replacement for a board I've damaged lately and he included also handwritten message with compliments. Thanks a very much!

.................................................. ...................
I use too Farnell quite much, and I`m very happy with their services.

Now just playing Sherlock Holmes in a OT post: I just wonder how the Farnell manager you never heard about before, knew already who you really are, where is your address, and knowing that you do this very appreciated job for the community here, and you Miero (a Farnell customer or not) needed a new BBB...
Far from me to be tendentious, but I just found all about this the same interesting as the project itself...
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Old 24th June 2014, 11:02 PM   #807
miero is offline miero  Czech Republic
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Coris: I was just writing with another guy from element14 community if it is possible to repair my damaged BBB, and he asked for serial number and my address... I did not know what it was for that time...

PET-240: .wav of course too ;-)
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Old 25th June 2014, 07:48 AM   #808
Coris is offline Coris  Norway
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Yes...quite simple. Nice...
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Old 26th June 2014, 10:02 AM   #809
miero is offline miero  Czech Republic
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You can try a new driver for BBB: http://bbb.ieero.com/

Features:
- I2S up to 192kHz/32bit
- DSD64 and DSD128
- 2 to 8 channels

And let's move discussion about it into its own thread: Support for Botic Linux driver
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Old 28th June 2014, 07:40 PM   #810
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Default Is the cape out?

Quote:
Originally Posted by miero View Post
You can try a new driver for BBB: http://bbb.ieero.com/

Features:
- I2S up to 192kHz/32bit
- DSD64 and DSD128
- 2 to 8 channels

And let's move discussion about it into its own thread: Support for Botic Linux driver
Miero, pressumably some have gotten hold of the cape, hence you've published the (beta)driver for it. Can we join in?
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