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Old 26th March 2015, 11:48 AM   #21
Russ White is offline Russ White  United States
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Quote:
Originally Posted by kinku View Post
Will Cronus Re-clocking Module with 45.1584/49.152MHz Rhea Pair can handle 44.1.khz samples without resampling?
It does no re-sampling. Just clock sourcing and then re-clocking to remove any source induced phase noise.
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Old 26th March 2015, 11:49 AM   #22
Russ White is offline Russ White  United States
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Originally Posted by twluke View Post
Thank you for this info and congratulation on your great works. I'm very happy to have this occasion of ordering these items at last.

BTW, how do you pronounce Hermes? Simply in an English way or somewhat in a French way like a luxurious brand, or even in a way back to the ancient Greek?

I know the question is silly but couldn't resist to ask .

twluke
Thank you.

Classical Greek
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Old 26th March 2015, 11:51 AM   #23
Russ White is offline Russ White  United States
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Originally Posted by GourouLubrik View Post
I guess there will be demand for such a module!
Noted Thanks!
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Old 26th March 2015, 11:57 AM   #24
BrianDonegan is offline BrianDonegan  United States
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Cronus - It's about time.
Incidentally, the clocks on the Rhea modules are Crystek CCHD-957s. The boards allow you to mount just about any clock though.
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Old 26th March 2015, 12:07 PM   #25
linuxfan is offline linuxfan  Australia
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On the subject of clocks, I was planning to use NDK clocks with the Cronus/Hermes, but some Googling suggests there's a notoriously high variance in performance parameters of NDK clocks, even within the same production batch.
What do others think? Does the choice of Crystek mean assured performance?
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Old 26th March 2015, 12:10 PM   #26
linuxfan is offline linuxfan  Australia
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Quote:
Originally Posted by twluke View Post
how do you pronounce Hermes?
... in a way back to the ancient Greek?
Quote:
Originally Posted by Russ White View Post
Classical Greek
- Cronus is the Greek god who was eventually regarded as the god of time by the Romans.
(not to be confused with "Chronos" the Greek god associated with time-keeping)

- Rhea is the sister/wife of Cronus.

- Hermes is the Greek god associated with speed.
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Old 26th March 2015, 12:14 PM   #27
Russ White is offline Russ White  United States
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During antiquity, Chronus(same as Chronos) was occasionally interpreted as Cronus - the ambiguity is intentional.
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Old 26th March 2015, 12:16 PM   #28
Russ White is offline Russ White  United States
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Originally Posted by linuxfan View Post
On the subject of clocks, I was planning to use NDK clocks with the Cronus/Hermes, but some Googling suggests there's a notoriously high variance in performance parameters of NDK clocks, even within the same production batch.
What do others think? Does the choice of Crystek mean assured performance?
We use Crystek in production precisely because they are consistent - proven - and excellent. But the Rhea boards do fit NDK. And Rhea has local bypass for clocks which require it.
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Last edited by Russ White; 26th March 2015 at 12:27 PM.
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Old 26th March 2015, 01:01 PM   #29
grael is offline grael  France
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Great project!

Seems really nicely done.

May I ask if a Hermes-Pi would be possible?

I know Raspberry Pi doesn't accept Master Clock input, but it can accept Bit Clock input.
So a Hermes-Pi which divides the master clock by the appropriate factor could feed the RPi with a nice bit clock.
Of course, a new alsa driver must be done to select the dividing factor on the board according to the music samplerate, but I don't think it should be too difficult.

Just food for thought!
A lot of Raspberry Pi are around and a Hermes-Pi + Cronus would be the ultimate (synchronous and no delay) solution for them to feed any i2s Dac.
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Old 26th March 2015, 01:33 PM   #30
pixelpusher is offline pixelpusher  United States
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Originally Posted by Russ White View Post
@syklab

If there is demand we could easily produce a 2:1 multiplexer for connecting two Hermes modules to a single Cronus. Or you could actually use 2 Otto-II right now.
I ordered one Otto-II for this purpose. Do I need two? I had planned to switch I2s to Buff-III from Hermes BBB and Hermes Amanero.
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