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Old 27th February 2012, 06:10 PM   #1901
perra_e is offline perra_e  Sweden
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Thank you for the information. That was exactly what I wanted to hear :-)

I will probably try to get the signal from 74LVC157. Then the switching between DSD and PCM will be automatic.

--Per
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Old 5th March 2012, 02:08 PM   #1902
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In the Sabre dac app note, ESS recommends inverted MCLK when that's synchronous, although they only says
"The inverted MCLK ensures that the Sabre noise as low as possible." and there's no further explanations.

Anyone tried these?

As far as I tried myself, (I stolen MCLK from transport via LVDS and made inverted at the LVDS receiver input.)
I felt it's slightly better in SQ, but I can't say surely it's better because I haven't done strict A/B comparison yet.

Besides, I have no skill and equipments to measure noise performance correctly.


I 'm just curious what other people found or felt in synchronous + inverted MCLK.
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Old 5th March 2012, 02:15 PM   #1903
qusp is offline qusp  Australia
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nope havent tried the inverted MCLK, its on my list of to do's though, thanks for reminding me
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Old 5th March 2012, 07:01 PM   #1904
PHEONIX is offline PHEONIX  Australia
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Hello

Can I ask what the difference in sound quality is when you go from synchronous as apposed to asynchronous.

Regards
Arthur
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Old 6th March 2012, 01:19 PM   #1905
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Hi, PHEONIX

As far as I have noticed, syncronous mode gives better separation, As if each instruments/voices reproduced with each own location.

On the contrary, when async, I felt some instruments or voices appears in the same location.

This kind of improvement sometimes seemed to result in such as "less muddy", "more revealed" sounds.


I recommend you to try yourself if you are interested.
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Old 6th March 2012, 08:14 PM   #1906
PHEONIX is offline PHEONIX  Australia
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Quote:
Originally Posted by wktk_smile View Post
Hi, PHEONIX

As far as I have noticed, syncronous mode gives better separation, As if each instruments/voices reproduced with each own location.

On the contrary, when async, I felt some instruments or voices appears in the same location.

This kind of improvement sometimes seemed to result in such as "less muddy", "more revealed" sounds.


I recommend you to try yourself if you are interested.
Hello wtk_smile

Can your describe your dac setup to me, what hardware and software control do you use.
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Old 7th March 2012, 01:22 PM   #1907
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SDTrans384 - i2s, including MCLK - Buffalo2 DAC

I use Arduino with Hifiduino code as a external dac controller.
It's very useful for buffalo2 dac because variable resister settings were very limited in stock MCU.

OSF bypass function required for 176.4khz or higher sample rate as in my current setup DAC's MCLK
are 22.5792mhz or 24.576mhz.


I only had experienced syncronous clocking using SDtrans384 and QA-550, both worked well.
Some - or many, I'm not sure - async usb-i2s DDC converters also should work in the same way.

Here's a example
Synchronous clocking the Buff 2 - Buffalo DAC - Twisted Pear Audio Support
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Old 7th March 2012, 02:06 PM   #1908
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Nice. I was not aware of the inverted MCLK tweak.
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Old 7th March 2012, 03:35 PM   #1909
glt is offline glt  United States
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What does "invert" the clock mean?
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Old 7th March 2012, 03:39 PM   #1910
qusp is offline qusp  Australia
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the phase is inverted, i have an invert MCLK phase register on my USB->i2s convertor as well and it appears it has a postive effect. i guess only Dustin can tell us why it benefits the ess dacs, but i guess it must not be that unusual. maybe it has something to do with latching onto the incoming clock more reliably
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