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Old 26th February 2014, 02:22 AM   #171
wlowes is offline wlowes  Canada
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I think what this thread is exploring... that with a rasberry pi or beagle bone you can bypass usb and get i2s straight out with a lot less jitter and closer to the holly grail of bit perfect with all the bits in the right time sequence.

I posted that question earlier but no one in the know chose to grace me with a confirmation.

Perhaps it has gone underground as someone has realized there is a product opportunity and time to clam up. Who knows. Sounds promising. I'll stick with current usb approach and let this mature a bit. It will develop in open source so a community will spring up and we will all benefit in time.

DSD source; cheap available open source hdw. Perhaps a triode filter to replace the DAC.

Keep your turntable as your grand kids will one day say really? Grooves in vinyl? Wow, was it powered by a steam engine?
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Old 26th February 2014, 02:34 AM   #172
mjock3 is offline mjock3  United States
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@ wlowes my question is different from yours, as to your question someone by the tag "LowOrbit" has done the I2s with the Buffalo III DAC over at
tirnahifi.org on the computer audio forum under Tweakers Rash.
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Old 26th February 2014, 03:36 AM   #173
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Hey guys, don't let my silence phase you. I have just been busy.

I am still exploring the ALSA code in regard BBB. I can confirm that there is no reason at least 192khz is not possible - and very likely 384khz.

I just have not had a lot of free time to play with it.

I do plan on producing a very DIY friendly cape for BBB if it pans out.

Otherwise I can do one for rpi. Who knows maybe both.

I am just still doing a lot of discovery in terms of the software and hardware.
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Old 26th February 2014, 05:22 AM   #174
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Russ, if I understand correctly others have observed 44.1khz being upsampled to 48khz by the current drivers as a result of a restriction of the BBB board clocks, thus unable to produce bit-perfect I2S signal from a typical CD based input file.

Do your investigations show a possible solution to that?

Last edited by ChrisMmm; 26th February 2014 at 05:40 AM.
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Old 26th February 2014, 09:03 AM   #175
Goto is offline Goto  United Kingdom
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Quote:
Originally Posted by mjock3 View Post
@ wlowes my question is different from yours, as to your question someone by the tag "LowOrbit" has done the I2s with the Buffalo III DAC over at
tirnahifi.org on the computer audio forum under Tweakers Rash.
Hi Mark

That's me, over on Tirna.

TBH I am a complete numpty with Linux but I got the I2S working with the RPi in less than an hour. The problem for us all is that there isn't a single place with ALL the info in a handy package.

If you review Russ' first post in this thread almost everything you need to get going is there. Pinout, sound config and pointers to the easiest software approach which is probably, but not exclusively, Volumio at this point.

I was very surprised when it all worked. My history with Linux audio has been frustrating, with wifi issues and NAS issues being high on the list and the seemingly obtuse way Linux handles sound files. Getting bit perfect audio out is no easier than with a pc, but it is doable and there are switched on people across the globe working to make this happen and easily for us.
Mark

Last edited by Goto; 26th February 2014 at 09:07 AM.
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Old 26th February 2014, 09:22 AM   #176
syklab is offline syklab  Hong Kong
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I just got a BBB delivered yesterday and have been looking around on how to get I2S output from it, I haven't seen any new release from Volumio which might address the I2s payback for BBB yet, is it coming soon? Any hint from expert?
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Old 26th February 2014, 12:43 PM   #177
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Quote:
Originally Posted by ChrisMmm View Post
Russ, if I understand correctly others have observed 44.1khz being upsampled to 48khz by the current drivers as a result of a restriction of the BBB board clocks, thus unable to produce bit-perfect I2S signal from a typical CD based input file.

Do your investigations show a possible solution to that?
I can't think of more ways so say yes. It is just a matter of making it practical.

It all about which ALSA drivers are loaded/used - and how mpd is set up.
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Old 26th February 2014, 01:21 PM   #178
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Hello people, i'm developing an acoustic analyzer unit based on the BBB with the "Audio Cape", my intention is to replace this cape for a better audio quality. I'm struggling very hard to make ASoC to recognize my custom ADC as a soundcard (i'm currently working with the ti pcm1803a which doesn't have I2C control interface).

Looking forward for reading your progress with the BBB!
Regards
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Old 26th February 2014, 07:24 PM   #179
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Originally Posted by Russ White View Post
I can't think of more ways so say yes. It is just a matter of making it practical.

It all about which ALSA drivers are loaded/used - and how mpd is set up.
Thanks Russ. I assume that once the drivers are developed the solution will aply to more than just MPD? I use Squeezelite, to date, with USM DACs, as long as the drivers are loaded SL seems happy.
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Old 26th February 2014, 08:06 PM   #180
mjock3 is offline mjock3  United States
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@ syklab see post #54 of this thread there is some good info on element 14 on this.

Mark
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