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Old 29th November 2012, 02:18 AM   #1581
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Quote:
Originally Posted by Bunpei View Post
Hi, Ian and qusp! Did you guys call me?

As for MCLK timing, wktk_smile once posted in the "ESS Sabre Reference DAC (8-channel)" thread as shown below;



Bunpei followed his post with this;



In the blog page by Mr. Kakuta of AIT Lab, a garage audio dac vendor in Japan, reported a result of his tuning efforts of the timing of synchronous MCLK for ES9018 showing spectra he obtained.

A.[Top] No tuning < 8.8kHz(?) single sine wave input (It is the worst case spectrum)>

B.[Middle] No tuning < 6kHz = 192kHz/32kHz single sine wave input >

C.[Bottom] Tuned. No spurious peaks.

Click the image to open in full size.

He said nothing about his measurement devices nor sampling frequencies.
I have no idea on what his spectra mean. However, wktk_smile's post reminded me of Kakuta's report.

Is this information helpful enough?

Bunpei

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Hi Bunpei,

Thank you for the info you posted.

Do you mean "No tuning" = normal MCLK and "turned" = inverted MCLK ?

I'll try the inverted MCLK at 90.xxx and 98.xxx MHz on ESS9018 DAC to see what's the difference between normal MCLK.

Regards,

Ian
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Last edited by iancanada; 29th November 2012 at 02:29 AM.
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Old 29th November 2012, 01:31 PM   #1582
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by iancanada View Post
Do you mean "No tuning" = normal MCLK and "turned" = inverted MCLK ?
Mr. Kakuta showed nothing in detail. He just described it as;
"Tuning of timing on a nano-second order"
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Old 30th November 2012, 11:32 AM   #1583
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Hi Ian,

My plan connect Amanero USB to SPDIF board via I2S input and the CD Transport to SPDIF board via SPDIF input.

I know SPDIF board is switching between I2S and SPDIF is by manual, but the manual is not connect the signal to Amanero or Coxial input ?.

Regards,

Van Duy

Last edited by nvduybom; 30th November 2012 at 11:57 AM.
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Old 30th November 2012, 11:30 PM   #1584
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See in IncludAdditionalI2Spdf manual.
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Old 1st December 2012, 02:01 AM   #1585
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Quote:
Originally Posted by nvduybom View Post
Hi Ian,

My plan connect Amanero USB to SPDIF board via I2S input and the CD Transport to SPDIF board via SPDIF input.

I know SPDIF board is switching between I2S and SPDIF is by manual, but the manual is not connect the signal to Amanero or Coxial input ?.

Regards,

Van Duy
I don't suggest connecting audio system to USB based I2S source directly. You need isolating the PC ground. An I2S signal isolator would be highly recommended.

Ian
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Old 1st December 2012, 02:50 AM   #1586
grufti is offline grufti  United States
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Does one of your boards fit the bill?

And, please: I am not criticizing Ian for advertizing his own designs. I am simply uncertain whether one of his designs can be considered a "general purpose I2S signal isolator". If the answer is yes, I would also like to know the maximum signal bandwidth of the design and/or the maximum sample rate that is supported.



Quote:
Originally Posted by iancanada View Post
I don't suggest connecting audio system to USB based I2S source directly. You need isolating the PC ground. An I2S signal isolator would be highly recommended.

Ian
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Old 1st December 2012, 05:56 AM   #1587
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Quote:
Originally Posted by iancanada View Post
I don't suggest connecting audio system to USB based I2S source directly. You need isolating the PC ground. An I2S signal isolator would be highly recommended.

Ian
"I2S signal isolator" mean FIFO isolator board V1.5 MINI KIT and I can use it in this case ?.

Last edited by nvduybom; 1st December 2012 at 05:59 AM.
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Old 1st December 2012, 08:23 AM   #1588
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Quote:
Originally Posted by grufti View Post
... I am simply uncertain whether one of his designs can be considered a "general purpose I2S signal isolator". ...
What about using the optical connection rather than "noisy" USB? Once you have bitperfect toslink connection then Ian's FIFO board + clock board will ensure perfect I2S output without connection to the PC ground. Any decent motherboard has an optical SPDIF output.

I think that optical isolation is the best choice from other options like: SPDIF transformers, USB isolation chips, I2S isolation chips, optocouplers or some wireless solution (that brings some noise again). You can even decide how far away your audio can be from the PC source - optical cables are available in various lengths.

Daniel
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Old 1st December 2012, 12:48 PM   #1589
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Quote:
Originally Posted by Popolvár View Post
What about using the optical connection rather than "noisy" USB? Once you have bitperfect toslink connection then Ian's FIFO board + clock board will ensure perfect I2S output without connection to the PC ground. Any decent motherboard has an optical SPDIF output.

I think that optical isolation is the best choice from other options like: SPDIF transformers, USB isolation chips, I2S isolation chips, optocouplers or some wireless solution (that brings some noise again). You can even decide how far away your audio can be from the PC source - optical cables are available in various lengths.

Daniel
Thanks Denie,

Quote:
Originally Posted by nvduybom View Post
"I2S signal isolator" mean FIFO isolator board V1.5 MINI KIT and I can use it in this case ?.
There are a quite a few I2S isolation solutions you can use, but the best solution is the native isolator comes with the usb sound card. Unfortunately I don't have a universal I2S isolator. However on the isolator kit, a reserved isolator footprint placed on PCB which you can make use of. You can use one of the isolaator chip from the options as the I2S isolator. But you have to figure out what to do by yourself.

Good luck.

Ian
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Old 1st December 2012, 03:17 PM   #1590
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Quote:
Originally Posted by iancanada View Post

There are a quite a few I2S isolation solutions you can use, but the best solution is the native isolator comes with the usb sound card. Unfortunately I don't have a universal I2S isolator. However on the isolator kit, a reserved isolator footprint placed on PCB which you can make use of. You can use one of the isolaator chip from the options as the I2S isolator. But you have to figure out what to do by yourself.

Good luck.

Ian
Thanks Ian , I will try more information for the best solution.
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