I meant one master to rule them all
I meant unique as to the other DACs from soekris which will not accept any external clock.
All soekris' DACs upsample to 2.8Mhz, I don't know if the clock is just running at 22Mhz... I know that there is a PLL, but still, it would be interesting to feed the dac with a external clock - wouldn't it?
I try taking it as a compliment for not thinking inside a box
I meant one master to rule them all
This can only work great, look at the EU
it would be interesting to feed the dac with a external clock - wouldn't it?
From what i understand the implementation of the fifo makes an external clock not possible at all.
With your way of reasoning - I think you will succeed ;-D
Pleas don't design anything serious like pacemaker or other life supporting gear.
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On a more serious note... Whats wrong with the clock?
Do you realise that even if there indeed exists clocks with lower phase noise than the one onboard, once you have connected the wires that shall carrie that clock, these wires themselves will most probably destroy that "superior" performance once it reaches the board.
The DAM provides a way to synchronise 2 (or more?) boards via externa lines - maybe it is this what you refer to as being unique? This in-itself does not enable the use of external clocks.
Back to the drawing board - or maybe rather enjoy the music!
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Do you realise that even if there indeed exists clocks with lower phase noise than the one onboard, once you have connected the wires that shall carrie that clock, these wires themselves will most probably destroy that "superior" performance once it reaches the board.
The DAM provides a way to synchronise 2 (or more?) boards via externa lines - maybe it is this what you refer to as being unique? This in-itself does not enable the use of external clocks.
Back to the drawing board - or maybe rather enjoy the music!
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This relates to the sound, right? Any hypothesis why this would be? Better clocks with the Cronus? Lack of isolation with the Pi? Sharing the specifics could be useful.
Weil, as with this implementation came more than just changing from rpi to BBB, so. I’d need to do a side by side comparison!
Søren, if the dust is settling with the introduction of the 1921/1941 could I respectfully request, on behalf of all of us 1121 users, you turn your attention to the new firmware for the 1121? It would be a great Christmas present for us 1121ers who are the only ones not using the new filters and feeling quite deprived....
Just out of curiosity. Has anyone tried to stack multiple boards for reduced distortion? Would be interesting to see test stats and subjective reports... theoretically it seems trivial to stack 1121's once the initial setup is complete, since clocks can be synced (whereas dual-mono is already a reach for 1021). Wonder if it'll get closer to MSB level performance. It's rather brute force but theoretically we can get probabilistically perfect DACs with a "large" number of boards
Too much day-dreaming lately. But I still think some sort of soft calibration with good measurements would be super interesting for everyone to see. It can't be THAT hard for Soren, or anyone with access to both firmware and good ADC equipment... zfe did rudimentary experiments with only a good DMM...
Too much day-dreaming lately. But I still think some sort of soft calibration with good measurements would be super interesting for everyone to see. It can't be THAT hard for Soren, or anyone with access to both firmware and good ADC equipment... zfe did rudimentary experiments with only a good DMM...
There is no way to directly compare these two. The cs8416 is an s/pdif receiver (outputting I2S) while the max3280 is just a comparator, used to convert coaxial s/pdif to a TTL signal that the dam can understand.
Loaded a new set of filters. Just tweaks of whats was there. Loading OK. Did power off/on.
When I hit play, short noise bursts, say every 2 seconds, comes out. Nasty. Hmmm. Checking uManager and # filters -> nothing just a empty printout.
Hmm - reloads filters that was working previously.
uManager and # filters -> nothing - just empty...
dam1121 uManager Rev 1.08 20160523 FPGA Rev 1.08 Press ? for help.
# filters
# help
uManager...
What do I do now?
//
When I hit play, short noise bursts, say every 2 seconds, comes out. Nasty. Hmmm. Checking uManager and # filters -> nothing just a empty printout.
Hmm - reloads filters that was working previously.
uManager and # filters -> nothing - just empty...
dam1121 uManager Rev 1.08 20160523 FPGA Rev 1.08 Press ? for help.
# filters
# help
uManager...
What do I do now?
//