Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 208 - diyAudio
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Old 13th January 2013, 02:19 PM   #2071
RollE2k is offline RollE2k  Sweden
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The signal delay that get induced when using the fifo, i have understand is up to approx 0,7sec with 44.1kHz signal, so i started wondering. since i will use the dac with my HTPC among other things.. when looking at movies that delay would be to much unfortunately. Would it be possible to have say one SPDIF input directly to the DAC (not through fifo/XO-board) or wouldn't the dac get the "right" clock then, since the XO-board wouldn't be given any signal?

Also, i have to choose - running the dac with active gain stage, or running it with fifo plus passive 1:25 MC step-up then straigt into my line stage. This is due to lack of space in my dac/preamp-case. Would the fifo+step-up be the best alternative?
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Old 13th January 2013, 05:00 PM   #2072
qusp is offline qusp  Australia
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we really need to post the answers to this question and a few others in advance, or pick one of the many times its been answered and link it in the wiki in red so it doesnt continuously get asked.

for starters cleanly switching between the 2 clocks on your dac (whatever that dac might be) would complicate matters and probably add jitter even if it was relevant. the rest tbh I have no idea what you mean, other than you are suggesting some sort of setup that erm partially goes through the fifo?...

the delay is unavoidable, you may find some way to switch spdif somehow if whatever you dac is has spdif, but it would not be easy. perhaps a couple of OTTO II could be used to switch the i2s as well, but none will involve switching the clock.

you may try upsampling the audio for your video streams if that is possible, this will shorten the delay, but until there a way developed to know what the specific delay is at any one time and communicate that to your computer so it can match that delay on the video, you are stuck with a delay, or you must get yourself another dac for video. its that simple, fifo was developed for audio.

we have not heard your dac, your MC step-up, or your line stage, we do not even know what they are, or what your taste is, how are we supposed to answer that sort of question? I know these sort of opinions are popular to throw around with no information on some user sites, but here not so much.

sorry dont mean to be harsh there but really, how are we supposed to answer that?
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Old 13th January 2013, 05:34 PM   #2073
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Quote:
Originally Posted by DUC985 View Post
I'm not getting any sound out implementing the FIFO with Dual Clock. Before searching myself to death. I think my I2S connection is not right. Can anybody check the wiring.
Using USB Amanero and Buffalo II

Amanero-------- FIFO-------------Buffalo II
Pin 3 Data------>DS------------>D2 / Data
Pin 4 CLK------->WS------------>D1 / CLK
Pin 5 FSCLK---->SCK------------>DCK
GND------------>GND------------>GND

thx
I think Amanero's pin 5 (FSCLK) goes into WS and pin 4 (BCLK) into SCK

Last edited by Jackal29a; 13th January 2013 at 05:41 PM.
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Old 13th January 2013, 05:37 PM   #2074
qusp is offline qusp  Australia
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thats correct, wasnt that answered already?

its just 'standard' i2s naming.


Data = DS-Data Sync = D2/Data
FSCLK = frame sync clock = LRCK = Left Right Clock = WS = Word Sync
CLK = SCK-Sample Clock = D1/CLK

Last edited by qusp; 13th January 2013 at 05:43 PM.
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Old 13th January 2013, 05:43 PM   #2075
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Quote:
Originally Posted by qusp View Post
thats correct, wasnt that answered already?
Nope, unless you mean in an older post.
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Old 13th January 2013, 05:44 PM   #2076
qusp is offline qusp  Australia
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Quote:
Originally Posted by Jackal29a View Post
Nope, unless you mean in an older post.
in the amanero thread, or somewhere else? isnt that where its from?
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Old 13th January 2013, 05:49 PM   #2077
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Originally Posted by qusp View Post
in the amanero thread, or somewhere else? isnt that where its from?
Its from the pevious page of this thread, post #20270.
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Old 13th January 2013, 05:59 PM   #2078
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Quote:
Originally Posted by Jackal29a View Post
I think Amanero's pin 5 (FSCLK) goes into WS and pin 4 (BCLK) into SCK
Thanks Jackal29a, you gave correct answer.

I2S signals on FIFO KIT named according to the I2S standard .
To connect with Amanero,
FSCLK -> WS
CLK -> SCK

Ian
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Ian GBV - I2S to PCM converter board & FIFO KIT
http://www.diyaudio.com/forums/group...ml#post3662743
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Old 13th January 2013, 06:10 PM   #2079
RollE2k is offline RollE2k  Sweden
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Quote:
Originally Posted by qusp View Post
.. sort of setup that erm partially goes through the fifo?...
First the Dac will be a Buffalo III-SE, and yes - i'm talking about running two spdif and one i2s source through the FIFO/XO, and then my question was, if running a THIRD spdif source straight to the dac (it does have a separate spdif input), would that work since the local XO is removed? in other words - would the dac anyway get the clock from the XO-board if the signal went straigt into the dac, and not through the FIFO/XO?

Quote:
we have not heard your dac, your MC step-up, or your line stage, we do not even know what they are, or what your taste is, how are we supposed to answer that sort of question? ...
.. sorry dont mean to be harsh there but really, how are we supposed to answer that?
Well, you don't have to know my taste to know what you think, i didn't ask you to answer how things sound in my system - And since i haven't heard the FIFO i could never know what or how much better "performance" it gives, which is why i ask. Since some people even are running the ES9018 in pure voltage output mode without I/V, does the FIFO still give big performance lifts for them?

I'm trying to plan how i will build my systems, and i think it's fair to have some questions. Also, everybody doesn't have the same time reading through thousands of posts. Anyway, i still think it's a fair question to those who have tried - and even if you don't want to answer then maybe somebody else would.
And by the way, i'm probably going to load the dac with ~1.8-2.2R per phase to gnd, and through a Lundahl LL9226 in 1:20 mode - if i choose to go that way.
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Old 13th January 2013, 09:15 PM   #2080
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RollE2k, the answer to your spdif question depends what the action of Ian's XO board is when there is no i2s input. I believe there will be no output on the mclk line without an input, which is going to be a problem for you.

I am working on a solution to the htpc problem for myself at the moment too. Do you have anything other than the htpc to connect? If the htpc is the only extra device to connect then I have a solution in mind but need to learn a bit more c++ and understand the code I need to write. Do you use xbmc by any chance?
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