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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
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Old 18th September 2020, 05:11 PM   #5571
carlmart is offline carlmart  Brazil
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Ian,

Is there a schematic anywhere for the LinearPi and the ConditionerPi?
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Old 18th September 2020, 05:14 PM   #5572
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Thanks A123,

Please no worries. We are in the same community.

FifoPi or McFifo needs good clocks to improve sound quality, which is also what I'm looking for.

Please keep us posted if there is any update.

Regards,
Ian
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Old 18th September 2020, 05:20 PM   #5573
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by carlmart View Post
Ian,

Is there a schematic anywhere for the LinearPi and the ConditionerPi?
The most detailed technical information is the user's manual. Otherwise, it could be not available.
GitHub - iancanada/DocumentDownload: Download documents of Ian's products

Regards,
Ian
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Old 18th September 2020, 05:20 PM   #5574
A123 is offline A123  United States
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Amazing. It looks identical to Ian's Pulsar clock shown in the Q3 photo:

Click the image to open in full size.

Click the image to open in full size.

10 MHz:

Click the image to open in full size.

Last edited by A123; 18th September 2020 at 05:25 PM.
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Old 18th September 2020, 05:21 PM   #5575
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Exactly !

Do you have a more clear picture of the phase noise plot?

Ian
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Old 18th September 2020, 05:21 PM   #5576
ilgavro is offline ilgavro
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after the last message i upgrade the Ian idea.
i already change the oscillator of raspberry with huge improve. for me is better rpi4 because have gigabit lan, and non ethernet via usb.


Click the image to open in full size.


rpi-def-3d — ImgBB

Last edited by ilgavro; 18th September 2020 at 05:25 PM.
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Old 18th September 2020, 05:33 PM   #5577
A123 is offline A123  United States
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Quote:
Originally Posted by iancanada View Post
Exactly !

Do you have a more clear picture of the phase noise plot?

Ian
Unfortunately, no. They have a PDF, but will have to contact them to see if they have any updated plots.

http://magicxtal.com/upload/uf/df1/M...D(en)%2012.pdf

A few DIY members mentioned there's re-badged Pulsar clocks out in the wild or in this case it's Pulsar OEM.

I'm just an end-user / messenger so hopefully in the next six months can learn more about this possible upgrade before getting upgraditis around that time.

EDIT: The photo in the PDF looks even more like the one in the Q3 photo. There's just no "Pulsar" stamp labeling on top.

Last edited by A123; 18th September 2020 at 05:39 PM.
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Old 18th September 2020, 06:22 PM   #5578
Joseph K is offline Joseph K  Hungary
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I was one of those who mentioned it. I had been looking at it ~2years ago..
Just for curiosity. Yes, these are identical.

Also the phase noise parameters are equal to those cited for Pulsar..
I think the Pulsar project really was a group buy adventure.. But for some reason did not hold..

Ciao, George
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Old 18th September 2020, 10:03 PM   #5579
1audio is offline 1audio  United States
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by Markw4 View Post
How does one best measure nonstationary or quasi-nonstationary distortion? Obviously, the typical audio FFT works best for measuring distortion that is perfectly stationary relative to the acquisition time frame.
An idea I proposed some time ago but never pursued-
First for this we must assume all the relevant musical information is contained in the encoded digital stream.
Start with truly random noise with a higher than musical crest factor either directly created digitally or encoded from an analog noise source.
Play the noise source capturing it with the most faithful/accurate ADC you can get. preferably with independent but exactly equal clocks. Then match the original data stream to the recorded data stream. This would be a good starting point: Audio DiffMaker

The nonstationary artifacts should show after correcting for any timebase or response errors.

What this most likely would not show are interactions in the grounding network or noise getting into associated audio equipment.

You can substitute music for the random noise but the noise would test about every sample transition possible given enough time. Its sort of a bit error rate test of the chain.
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Old 19th September 2020, 01:46 AM   #5580
Hanze Khronye is offline Hanze Khronye  Australia
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Quote:
Originally Posted by Joseph K View Post
Just for curiosity. Yes, these are identical.

MX037/14D, MX037/14 ?

MX037/8P looks better.
Attached Images
File Type: jpg MX037_14D.JPG (19.0 KB, 64 views)
File Type: jpg PN_2.JPG (103.7 KB, 63 views)
File Type: jpg PN_1.JPG (63.6 KB, 57 views)
File Type: jpg MX037_8P.JPG (16.0 KB, 63 views)
File Type: jpg PN_3.JPG (64.2 KB, 67 views)

Last edited by Hanze Khronye; 19th September 2020 at 02:14 AM.
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