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Old 26th December 2001, 07:32 AM   #1
richt is offline richt  Puerto Rico
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Question clock reshaper device for cd!

merry christmas to all!

i recently modified heavyly my cd player witha lot of success!

new servo section/4 independent power supplies/new master clock/eliminated transistorizied mute & emphasis circuits
(replaced with relays)/burr brown op amps/clock reshaper
circuit/ dual regulation on each supply!

the only original on cd player is the brand on the faceplate.


if someone can help me or bring more info about a circuit
to reshape perfectly an incoming jittery signal.

no matter if you have the best player or converter of the planet,
you always have jitter outcoming from the dsp or chipset
(word clock)

with my simple circuit (74hc00) ive learned that jitter destroys a
lot of information & makes the cd to sounds very digital!

thanks to all
richt
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Old 26th December 2001, 09:47 AM   #2
tvi is offline tvi  Australia
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how about this <font size="-2">(pics a link):
</font><a href="http://www.ne.jp/asahi/sound.system/pract/Nagas_HP/reclock4.htm"><img src="http://www.ne.jp/asahi/sound.system/pract/nagashome.files/Rclock4.gif" ></a>

The <a href="http://www.ne.jp/asahi/sound.system/pract/Nagas_HP/index.htm">whole site</a> is interesting.

The Satri circuit for I/V conversion looks interesting?

Regards
James
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Old 26th December 2001, 10:04 AM   #3
richt is offline richt  Puerto Rico
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thank you very much for your reply!

merry christmas
richt

p.s. i will try & let you know.
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Old 26th December 2001, 11:49 AM   #4
richt is offline richt  Puerto Rico
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hi james

i cant find the translation from japanes to english for
the website that you told me?

can you tell me hou you made it?

thanks
richt
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Old 26th December 2001, 12:17 PM   #5
tvi is offline tvi  Australia
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I usually use <a href="http://www.ne.jp/asahi/sound.system/pract/Nagas_HP/reclock4.htm"><b>Babel Fish</b></a> for Japanese.

I have been meaning to try it myself but the DAC chips (PCM55HP) in my external DAC don't use BCKO, LRCK or WCKO, their parallel input devices.


Regards
James
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Old 26th December 2001, 12:48 PM   #6
Jason is online now Jason  Australia
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I didn't realize <a href="http://babelfish.altavista.com">babelfish</a> did Japanese these days. Wow. Closer to star trek every day.

Well, almost. It would explain all those crazy manuals.

"The extent which is not believed it was improved. The real image of sound spreads to real truly before the eye. If the speaker goes out completely from consciousness and extends the hand it may be touched by the [something], is. It is glamorous truly, is. In the present my system being something which does not come out, it does this smoothness."
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Old 11th January 2002, 03:14 PM   #7
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Lightbulb asynchronous clock reshaper or reclocking

Hi All!
It can be far more simple and <B>better</B> done with a independent clock in the DAC. Please see my post on the AudioAasylum:
http://www.audioasylum.com/audio/dig...ges/35322.html
Cononect the 45MHz (or higher) oscillator to <B>CK</B> in the schematic and omit the 74HCU04.
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Old 11th January 2002, 03:40 PM   #8
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I've moved this thread from the Pass Labs forum to Digital.

Grey
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Old 12th January 2002, 07:11 AM   #9
Dave is offline Dave  New Zealand
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Elso,

I don't think that driving the clock input of the D Flip-Flops with a clock that is not synchronized with the logic level at the D input is a good idea. The reason is that the setup and hold times of the D flip flops Data input are not going to be guaranteed thus causing the flip flop to enter a metastable state every now and then. This goes against basic digital circuit design practice and bits of data are going to be lost.

I am going to experiment with a small FIFO - please see this thread.

Jitter in DAC.

Jitter in DAC.

This should enable the master clock to drive the DACs directly and be looped back to any where in the digital signal path (transport, output of sample rate converter) without timing problems becoming an issue.
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Old 12th January 2002, 08:15 AM   #10
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Lightbulb Asynchronous Reclocking

Hi Dave,
I had the same gutfeeling as you and figured it wouldn't work at all "asynchronous".
I managed to bring over the clock from the transport to the DAC and it gave a slight improvement. Then I got drastic and figured what wiill happen if I use a independent clock in the DAC absolutely not related to the clock in the transport?
To my big surprise it worked! I have tried various frequencies: 16.9344, 24, 24.15, 32, 36 and 45.158 MHz and it turned out the higher the reclocking-frequency is the more analog and better sounding the result is. I did not hear any dropouts in the sound or other anomalies! Square wave from the testdisc is still perfect from the DAC.
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