Go Back   Home > Forums > >

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old 10th January 2016, 10:04 PM   #4001
Eldam is offline Eldam  France
Banned
 
Join Date: Sep 2012
Location: France
Hi,

This one has a LiFePo4 manually clickable programe : Chargeur Testeur Intelligent Universel Lcd Li-Ion Lifepo4 Ni-Mh Soshine H4

I didn't test it. This is the cheapest I found in this part of the world with monitoring.
  Reply With Quote
Old 12th January 2016, 09:21 AM   #4002
ernesternest is offline ernesternest  Europe
diyAudio Member
 
ernesternest's Avatar
 
Join Date: Oct 2007
Location: Cologne
Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by Eldam View Post
Maybe adjust a delay in VLC player ?
Thanks Eldam, this does work very well with VLC Player.

Still there is an issue with other sources, online TV for example.

So I thought I might cover this as follows:

I would use 2 pieces of Twisted pear OTTO II (1:2 - two way i2s switch, one after the USB bord to be able to send the I2S signal either to IANs board or directly to the DAC and the second switch prior to the DAC as 2:1 switch).
In my case, the DAC has a relay switch anyway, so I only need one OTTO. The other option were to put a second OTTO between FIFO board and Clockboard, which would give the opportunity to use the pcm board also in "video mode".

This should bypass FIFO in case of playing videos.

Anything negative to expect?


Ernst
  Reply With Quote
Old 14th January 2016, 05:26 PM   #4003
Eldam is offline Eldam  France
Banned
 
Join Date: Sep 2012
Location: France
Default FIFO or Clock broken ?

Hello Ian,

I need help please t debug a problem.

After three times listening sessions, My Fifo 2 or clock 2 is (are) not working anymore !

All was good, before I switched again the Front end to my AYA 2 DAC the forth times ! Aya & your Front end are not on the same plug so are switched on one after the other in no particular order !

all the leds (fifo, isolator, clock) are green but there is a pop at the switching ON, the red light at the input of the Fifo immediately swap from red to green, the same on the clock board !

The source is a WaveBoard I/O : I rechecked in direct with the same uf-l cable : it works !

But now when I reconnect the front end : fifo + isolator + clock : the streamer doesn't see anymore the front end like it did the first three times !

All is powered with serious TS7A boards with 3.29 V for the clock board and 4.99 V for the Fifo (isolator are feeded at the two sides by each of the two boards and the light are green) !

Is there case of broken FIFO, how to check if the FIFO is broken or the Clock board (I checked twice the connections, changed the uf-lcable by new ones, the dac and the Wave I/O are working fine, I surmise an electric choc when I switched On the front End after the DAC or vice-versa the fourth times !)

Is there an order for switching on the front end ? And above all how to solve the situation ?! Is it so fragile ?

Help please, I was appreciating what I listened to the first three times

regards

Eldam
  Reply With Quote
Old 14th January 2016, 06:44 PM   #4004
Eldam is offline Eldam  France
Banned
 
Join Date: Sep 2012
Location: France
It works again !

despite new uf-l plugs : it seems if one of the uf-l plugs doesn't see by contact a signal , the input red led of the Fifo doesn't turn red, either the clock board side. So moving the uf-l cables on their plugs help (I tied several times before it works ! I surmised tired uf-l plugs on the pcbs )

But if you turn the gulty ufl- cable on the good plug : the clock board green leds (all the leds) flash and the after coming back stable (green without flashing), the streamer see again the I2S signal. It was stable green before despite all the I2S signal were seen !

Conclusion : only one uf-l cable or plug with a bad contact suffice to hide the front end to the soft streamer.

False alert ! changing all the ufl cable was not enough, uf-l soldered plugs (pcbs ones) are fragile after several connections.

I like a lot what I listen to : far better than the v1 Dam DAC I solded (never tried the other filter or the other layouts).

And I didn't pluged the I2StoPCM yet !

Last edited by Eldam; 14th January 2016 at 06:47 PM.
  Reply With Quote
Old 19th January 2016, 09:29 PM   #4005
Crom is offline Crom  United Kingdom
diyAudio Member
 
Join Date: Oct 2012
Hello Ian,

I am thoroughly enjoying the fruits of your labour with the latest clock and fifo boards working hard in my system - thank you!

Exciting news about the multi-channel / DSD FIFO. I am interested to try DSD. Are you able to give us anymore information about it? I am particularly interested to know:

- Whether it will be possible to re-use the existing, latest clock board?
- Will we need new clocks for higher rate DSD playback?
- Will it be possible to use in stereo as opposed to multi-channel?
- If a new clock board is needed, would it be possible to retain the dual mono outputs on the new board?

All the best to you,
Crom
  Reply With Quote
Old 21st January 2016, 04:06 PM   #4006
iancanada is offline iancanada  Canada
diyAudio Member
 
iancanada's Avatar
 
Join Date: Dec 2009
Location: Toronto
Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by Crom View Post
Hello Ian,

I am thoroughly enjoying the fruits of your labour with the latest clock and fifo boards working hard in my system - thank you!

Exciting news about the multi-channel / DSD FIFO. I am interested to try DSD. Are you able to give us anymore information about it? I am particularly interested to know:

- Whether it will be possible to re-use the existing, latest clock board?
- Will we need new clocks for higher rate DSD playback?
- Will it be possible to use in stereo as opposed to multi-channel?
- If a new clock board is needed, would it be possible to retain the dual mono outputs on the new board?

All the best to you,
Crom
Hi Crom,

I'm glad that you are happy with my FIFO KIT in your system.

Thank you for your interest in my current multi-channel FIFO project.
Just let me answer your questions:

- Whether it will be possible to re-use the existing, latest clock board?
:New multi-channel FIFO has 8 DSD /14 I2S channels with 7 DATA and one LR/DATA signals. So it need a new clock board to achieve those new features. However XOs on the old clock board can be re-used for sure.

- Will we need new clocks for higher rate DSD playback?
:Any XO works for old clock board will work for the new one, as well as higher rate DSD playback. 45/49 or 90/98 are recommended as long as your DAC MCLK works with those frequencies.

- Will it be possible to use in stereo as opposed to multi-channel?
multi-channel FIFO works for stereo playback. You just need picking up only two channels in this case. However re-mapping stereo into multi-channel can also be taken into consideration as a new feature.

- If a new clock board is needed, would it be possible to retain the dual mono outputs on the new board?
:It is possible. The only thing is that more u.fl sockets will be mounted on board for dual mono applications, since we are all happy with the high quality coaxial cables for DSD/I2S signals.

At current stage, I'm still open to suggestions. Please let me know what do you want to see if I can achieve.

Regards,
Ian
  Reply With Quote
Old 22nd January 2016, 08:29 AM   #4007
Crom is offline Crom  United Kingdom
diyAudio Member
 
Join Date: Oct 2012
Quote:
Originally Posted by iancanada View Post
Hi Crom,

I'm glad that you are happy with my FIFO KIT in your system.

Thank you for your interest in my current multi-channel FIFO project.
Just let me answer your questions:

- Whether it will be possible to re-use the existing, latest clock board?
:New multi-channel FIFO has 8 DSD /14 I2S channels with 7 DATA and one LR/DATA signals. So it need a new clock board to achieve those new features. However XOs on the old clock board can be re-used for sure.

- Will we need new clocks for higher rate DSD playback?
:Any XO works for old clock board will work for the new one, as well as higher rate DSD playback. 45/49 or 90/98 are recommended as long as your DAC MCLK works with those frequencies.

- Will it be possible to use in stereo as opposed to multi-channel?
multi-channel FIFO works for stereo playback. You just need picking up only two channels in this case. However re-mapping stereo into multi-channel can also be taken into consideration as a new feature.

- If a new clock board is needed, would it be possible to retain the dual mono outputs on the new board?
:It is possible. The only thing is that more u.fl sockets will be mounted on board for dual mono applications, since we are all happy with the high quality coaxial cables for DSD/I2S signals.

At current stage, I'm still open to suggestions. Please let me know what do you want to see if I can achieve.

Regards,
Ian
Thanks Ian, the ability to play stereo DSD as well as stereo PCM is my prime motivator here.

I definitely would like to retain the dual MCLCK outputs from the current board.

I would also like dual mono outputs as per the current clock board.

It would be useful to be able to off-board the LEDs so that the could be mounted on a front fascia and used to identify DSD/PCM and the rate.

The SMA connectors used for the MCLCK connectors are much better than the u.fl (in terms of reliability after a few insertions, ease of deployment and the ability to use better cable) so I would like to see more use of the larger connectors - potentially as a replacement for all the u.fl?

Many thanks and my name is on the order list as soon as it's available!
All the best
Crom
  Reply With Quote
Old 26th January 2016, 05:12 PM   #4008
mcluxun is offline mcluxun  United States
diyAudio Member
 
Join Date: Nov 2010
I dont know if this has been asked before.
It seems that the common setup is put FIFO first before isolation.
Can I reverse the order? And would that yield a better result?
Thanks
  Reply With Quote
Old 26th January 2016, 06:08 PM   #4009
TNT is offline TNT  Sweden
diyAudio Member
 
Join Date: Apr 2003
Location: Sweden
Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
FIFO shall be the last thing before the DAC using shortest possible u.fl cabling. No isolator between DAC and FIFO. Isolator before FIFO. Power feed the things on each side of the isolator from sources that don't share ground i.e. from 2 different transformers/rectifiers/LDOs.

//

Last edited by TNT; 26th January 2016 at 06:12 PM.
  Reply With Quote
Old 29th January 2016, 04:42 AM   #4010
chikkamath is offline chikkamath
diyAudio Member
 
Join Date: Dec 2015
Default I2S RECLOCKER BIT PERFECT TEST

Hi Ian,
I am also working on I2S reclocker.I want to check following tests.I have some doubts.

1. what is bit perfect test? How to do it?

2. In the thread you have mentioned default mclk=256*Fs. I understood that 256=4*64bit (Left and right channel width).But I didnt get that , how 4 comes here.

3.how to minimize FIFO latency?


Thank You.
  Reply With Quote

Reply


Asynchronous I2S FIFO project, an ultimate weapon to fight the jitterHide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
XMOS-based Asynchronous USB to I2S interface Lorien Digital Line Level 3310 5th July 2021 12:20 PM
exaU2I - Multi-Channel Asynchronous USB to I2S Interface exa065 exaDevices 1422 22nd March 2020 02:15 PM
DAC chip selection + I2S jitter questions drwho9437 Digital Line Level 2 26th July 2010 12:50 PM
Simple FIFO to I2S CPLD, for MCU players / reclocking KOON3876 Digital Line Level 21 19th September 2008 04:00 PM
asynchronous reclocking and low jitter clocks ash_dac Digital Source 3 8th February 2005 09:22 AM


New To Site? Need Help?

All times are GMT. The time now is 10:08 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki