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Old 21st December 2004, 04:15 PM   #91
jwb is offline jwb  United States
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Default Re: REAL 1PPM?

Quote:
Originally posted by YENFU
I also doubt about the spec. of 1ppm.The crystal is specially ordered from Japan.I guess the 1ppm spec. should be based on some special conditions.
I don't doubt 1ppm, but I do doubt that it helps the sound. 1ppm is a specification for satellites, not for CD players. 1ppm simply means that the clock will have the same mean frequency in 20 years as it does today, but it tells you nothing about the relationship of two consecutive clock edges (jitter, phase noise, etc). Similarly, temperature control helps stability at very low frequencies, but is pointless at audio frequencies.

The mechanical suspension of the clock is also suspicious. What's the resonant frequency?
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Old 21st December 2004, 04:53 PM   #92
Coulomb is offline Coulomb  England
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Here is a really dumb question, but my ability to humiliate myself in public never surprises me.

Could you isolate any noise from an oscilator circuit by opto-coupling the output of the clock to the input of the device being reclocked?

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Anthony
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Old 21st December 2004, 05:12 PM   #93
Rarkov is offline Rarkov  England
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Would someone please explain why the firmware for a fully loaded CD Player is so b****y difficult?! I'm onto Shuffle mode after completing typing in track numbers from a remote and next is rollover remote commands (volume / fast forward)...

Coulomb:
Also at the risk of embarrassing myself, I would guess not since I don't think Optoisolators can run at 16MHz...But that is just a guess. I was on a website for a clock (Can't remember which) yesterday, and the clock signal was said to be very impressive, yet it had ringing all over it. Presumably these clock designers are battling to find fast enough components. Elso / Guido?
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Old 21st December 2004, 06:14 PM   #94
YENFU is offline YENFU  United States
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Default damping

I think no one have the ability to control everything which will hurt the sound quality.Using the Pure Clock only help us to get a better clock than BEFORE.

We still have a lot things to do.But we do try to improve the factor.(In fact.I do not install the pure clock in my CD-PRO2 transport now.)

The suspension column could fill in some damping material,such as oil.The resonat frequency will depend on the damping ratio.For me,this will be an interesting game.....IT'S DIY!
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Old 23rd December 2004, 07:17 AM   #95
TS Lo is offline TS Lo  Hong Kong
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Hi BrianGT

I just joined the Forum yesterday.
I wonder whether its still not too late to add
myself to the list for one set of boards/chips.

TS
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Old 2nd January 2005, 01:06 AM   #96
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Default hi brian

same as ^^^, new and interested in a board....
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Old 7th January 2005, 07:51 PM   #97
Kip is offline Kip  United States
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I want in on this too. I am selling my Proceed CDD and need something good to build.
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Old 12th January 2005, 01:28 AM   #98
billr is offline billr  New Zealand
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hello brian

do you have a circuit diagram for your cdpro/display controller unit?

look forward to hearing from you

thanks

bill
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Old 12th January 2005, 03:31 AM   #99
Coulomb is offline Coulomb  England
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Quote:
Originally posted by billr
hello brian

do you have a circuit diagram for your cdpro/display controller unit?

look forward to hearing from you

thanks

bill
From Brian's website.




http://www.briangt.com/gallery/cdpro2-pcb
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Old 12th January 2005, 07:32 AM   #100
billr is offline billr  New Zealand
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thanks for getting back to me on this, much appreciated. I've got the diagram now, do you know what was used to decode the IR remote control, the diagram is vague on that.

many thanks

bill
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