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New USB to I2S 768Khz - DSD512/1024* Converter
New USB to I2S 768Khz - DSD512/1024* Converter
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Old 26th April 2016, 10:51 AM   #21
McDaisy is offline McDaisy
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Does this IC turn off the I2S signal when unplugged from usb bus?
If it does, is there a chance to easily reprogram that part of the software to always ha e clocks on even if usb is disconnected?

Thanks!

/George
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Old 30th April 2016, 06:40 AM   #22
UUDDA is offline UUDDA
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Quote:
Originally Posted by diyinhk View Post
The current firmware of the 768k PCB is only enabled and tested for usb to i2s 768k and DSD512/1024*

Enable 768k from the official firmware requires 45/49 clock and unique optimization and it can not be done by user following the official xmos programming guide normally.

For ADC->I2S->USB usage, the multichannel xmos pcb using 22/24 clock should be the choice for most people, but it is only upto 384k. User can follow the port map and uses the onboard full size XSYS connector to program the xmos with their customized firmware to add any feature and function by following the xmos programming guide.

USB to I2S 768Khz - DSD512/1024* Converter

Performance is indeed very perfect. But JITTER and the clock if better processing.
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Old 1st May 2016, 04:00 PM   #23
HpW is offline HpW
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Originally Posted by UUDDA View Post
USB to I2S 768Khz - DSD512/1024* Converter

Performance is indeed very perfect. But JITTER and the clock if better processing.
How did you test whether there is a 100% BIT accuracy... using MS Windows and ASIO or WASAPI Exclusive??

Hp
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Old 2nd May 2016, 12:14 PM   #24
vulejov is offline vulejov  Serbia
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Quote:
Originally Posted by diyinhk View Post
AK4490 and AK4495 in hardware parallel control mode can playback 768K PCM immediately.
I'm interested for new XMOS_AK4490 combo..
Do I need some work for PCM-DSD switching, or this runs automatically..
What will be active AK4490 filter settings in such combo..
Is it enough to supply this combo with yours Classic Reference 78xx power supply linear regulator 3.3V 5V +-12V - DIYINHK
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Old 11th May 2016, 07:10 AM   #25
diyinhk is offline diyinhk
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Originally Posted by ultrafi View Post
How would you compare the sound of this board to your other USB boards?
Technically, it's 2x better.
but different people like different sound it's hard to compare.
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Old 11th May 2016, 07:14 AM   #26
diyinhk is offline diyinhk
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Join Date: Sep 2012
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Originally Posted by APK View Post
Hi diyhkare you saying in #17 that with the use xTIME composer we can alter your firmware or do you mean writing from skratch which is beyond me?
The usb audio source code is available in the xmos official web site for anyone to download.
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Old 11th May 2016, 07:17 AM   #27
diyinhk is offline diyinhk
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Join Date: Sep 2012
Quote:
Originally Posted by McDaisy View Post
Does this IC turn off the I2S signal when unplugged from usb bus?
If it does, is there a chance to easily reprogram that part of the software to always ha e clocks on even if usb is disconnected?

Thanks!

/George
This PCB is powered by external regulated 3.3V connected to the 20pin header labelled 3.3V and GND, the BCK, MCK, LRCK is always on after the power is supplied.
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Old 11th May 2016, 07:21 AM   #28
diyinhk is offline diyinhk
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Join Date: Sep 2012
Quote:
Originally Posted by UUDDA View Post
USB to I2S 768Khz - DSD512/1024* Converter

Performance is indeed very perfect. But JITTER and the clock if better processing.
The MCK Jitter is the same as the famous onboard low phase noise ndk oscillator.
One clear advantage of XMOS usb audio device over the other is the MCK directly from the oscillator. No component or MCU FPGA inbetween degrade the signal quality.
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Old 11th May 2016, 07:25 AM   #29
diyinhk is offline diyinhk
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Join Date: Sep 2012
Quote:
Originally Posted by HpW View Post
How did you test whether there is a 100% BIT accuracy... using MS Windows and ASIO or WASAPI Exclusive??

Hp
I have found a way to verify 100% i2s signal bit accuracy.
Anybody can also try it.
I used it to verify all my FIFO reclock nonoversampling bit perfect DAC project.
Compose i2s data stream to verify real bit perfect by oscilloscope
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Old 11th May 2016, 07:33 AM   #30
diyinhk is offline diyinhk
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Join Date: Sep 2012
Quote:
Originally Posted by vulejov View Post
I'm interested for new XMOS_AK4490 combo..
Do I need some work for PCM-DSD switching, or this runs automatically..
What will be active AK4490 filter settings in such combo..
Is it enough to supply this combo with yours Classic Reference 78xx power supply linear regulator 3.3V 5V +-12V - DIYINHK
The 768K xmos flashed with ak449x specific firmware handles all the PCM-DSD switching. The 768k ak449x fimware is fine tuned, no click noise during PCM-DSD switching or pause/playback. But delay power on /instant off output is still needed to mute the power on off click noise.
The filter setting is default the same as the ak449x datasheet.
All power supply meet the PCB power supply requirement can also be used. The 78xx is a high c/p regulator.
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