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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 27th September 2019, 06:31 PM   #5081
tubo is offline tubo  Philippines
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Thank you Ian. Looking forward to it. This is great!!!
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Old 27th September 2019, 06:38 PM   #5082
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by hifir View Post
it would be nice to add aes output.
and that there would be the possibility of the board working from 3.3v (Lifepo4 power).

With Best Regards.
Thanks hifir,

It will work from either external 3.3V rail or from GPIO.

But I don't think there is space on PCB for AES XLR connector. You can use an adapter if you really need AES.

Regards,
Ian
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Old 27th September 2019, 06:46 PM   #5083
hifir is offline hifir
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Quote:
Originally Posted by iancanada View Post
Thanks hifir,

It will work from either external 3.3V rail or from GPIO.

But I don't think there is space on PCB for AES XLR connector. You can use an adapter if you really need AES.

Regards,
Ian
ok, this project will be an addition to fifopi ultimate?
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Old 28th September 2019, 01:03 PM   #5084
zgtc is offline zgtc  Europe
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Quote:
Originally Posted by iancanada View Post
. Can automatically switch to S/PDIF if presents
. Can automatically switch to USB streamer when powered
. Possible to have a control panel

Ian
hi Ian, two questions

1. will it be possible to use RPi pins to select the source (not just auto if present in S/PDIF or USB channels)?
2. how many GPIO free pins be available in the RPi?

thank you
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Old 2nd October 2019, 05:44 PM   #5085
tubo is offline tubo  Philippines
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Hi Ian,

Will this clock work with the new transport/ receiver you’re making?

Low jitter abbasaudio tube clock for CD,upgrade,ECC88 11,2896 mHz Low jitter abbasaudio tube clock for CD,upgrade,ECC88 11,2896 mHz | eBay
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Old 3rd October 2019, 02:05 AM   #5086
Greg Stewart is offline Greg Stewart  United States
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by iancanada View Post
Thank you so much ilgavro. I'd be very interested in evaluating it.
I can send it back to you when I finish the test. Please let me know.

Regards,
Ian
@Jacklee worked out getting a Neutron Star to work with the FiFoPi and posted info in this thread:

IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...

Either search for Jacklee or for Neutron.

Greg in Mississippi
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Everything matters!
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Old 3rd October 2019, 06:19 AM   #5087
TioFrancotirador is online now TioFrancotirador  Poland
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Quote:
Originally Posted by iancanada View Post
I like my RPi DAC HAT and FifoPi combinations.With low jitter XOs, good power supply and sync mode, I really enjoy the sound quality and couldn't help listening music with them everyday.

But for many years, I have huge CD collections. I miss then so much and want to listen to them on my RPi DAC system(No doubt true bit-perfect through S/PDIF). As well, I also have a lot of music sources that can be accessed from PC through a USB streamer, such as Foobar2000, Youtube, and many more.

So I decided to design a ReceiverPi to extent the ability of RPi DACs to access more music sources. It will be the first S/PDIF, external I2S/DSD interface board for RPi based audio applications.

Besides the music from RPi GPIO itself, ReceiverPi will have three additional music inputs:

1. Coaxial S/PDIF through RCA ( isolated, up to 192KHz)

2. Optical S/PDIF ( up to 192KHz ,of course isolated)

3. I2S/DSD input for external USB streamer and other digital music sources, up to 768KHz


Click the image to open in full size.
ReceiverPi by Ian, on Flickr

I'd also like the ReceiverPi to have follow features:


. Low jitter and low noise design for better sound quality.

. Seamlessly integrated with FifoPi and ESS DAC HAT(sync mode) by installing between RPi and FifoPi or between RPi and DAC.

. Can automatically switch to S/PDIF if presents

. Can automatically switch to USB streamer when powered

. Can run RPi DACs even without a RPi (RPi free mode)

. Run ESS DAC HATs directly at sync/async mode even without FifoPi (light weight mode)

. Possible to have a control panel

. Reserved GPIO port for possible or user designed Linux/Web based software control

. optional independent DC power input

. Can be easily configured as S/PDIF FIFO by integrating with FifoPi and TransportPi

. DIY friendly and plug and play


I'm having the a finished prototype PCB now. I'm working on it. More update will be posted soon.

Ian
Ian, any plans for ak4137 SRC board to put it between this board and FifoPi ? ...
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Old 25th October 2019, 02:24 PM   #5088
jimk04 is offline jimk04  United Kingdom
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Good afternoon. Hope we are all well.

Having read a lot of this thread I feel I am nearing a time to purchase a Fifo board.

I currently run ethernet>Rpi Volumio>isolator v2>ian dual dac>ivstd.

So I have room for improvement by adding a fifo board. But which one should I go for? Is it a no brainer just to choose the FifoUltimate. I currently dont listen to any DSD files. I stream from Spotify and I internet radios via Volumio. I may some day add an external hdd.

Does the ultimate NOT do anything that Ian's earlier fifo boards may do?

I'm not really sure what crystal speeds I need/ listen to. I use the up sampling option in Volumio. Currently set at the 700 something option, was at 300 something setting for a while too. I cant hear much change. The ess controller always seem to say 192k and 12Mhz if playing internet radio but drops to 44k for Spotify.

Any advice for this less experienced user appreciated.
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Old 25th October 2019, 02:39 PM   #5089
Markw4 is offline Markw4  United States
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Quote:
Originally Posted by jimk04 View Post
Any advice for this less experienced user appreciated.
I tried both of Ian's FIFO solutions and liked FIFO_Pi better. Its the one I would recommend, provided it is used with the optional Shield and or other modifications to the stack I wrote about previously.
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Old 25th October 2019, 06:33 PM   #5090
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by TioFrancotirador View Post
Ian, any plans for ak4137 SRC board to put it between this board and FifoPi ? ...
If I had time to design an AK4137 HAT, I'll make it running in SYNC mode for even better sound quality.

It's already on my list but I'm not sure when I have time.

BTW, just run DSD64 and DSD128 from ES9038Q2M dual mono DAC HAT in true SYNC mode with success. DPLL stopped completely. The sound is really amazing with new improvement!

I'll post the steps later.

Regards,
Ian
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