Asyncronous reclocking of transport SPDIF output

[kevinkr]

Hi RFBW,
Yes I know what the title of the first post was and the initial subject of the thread - I was an early participant, but as I stated earlier my question was aimed at a specific assertion that Jocko made in regards to generating the spdif output - which was admittedly an aside to the general topic of the thread, but appeared in this thread. My question was seeking clarification of that assertion only, and I intended no offense in my response.

I was actually hoping Jocko would reply in person, as you may note in my post the question was directed solely at him. I can think of several reasons why this might not be the optimum approach, but as he is regarded as something of a guru on such issues I really wanted to hear his response.

Also as previously noted many theta and all PS Audio transports drive their aes/ebu and spdif transformers directly off of the Q and Q_bar flipflop outputs, and sound good doing it.



Kevin

[Jocko Homo]

I have answered that question the other day on another forum. Rather than advertise the fact, I let the others say the same thing. But if you are enterprising you may be able to find the answer.

Anyway.............as rfbrw points out, that will be the least of your problems. But go ahead............try it anyway. You'll find out the hard way. Two bad ideas combined can make for some really rotten sound.

(But if you put Wadia on the front panel, no one will know! Amazing how many people can hear dreck, and think it is hot snot just because it costs $8K.)

Jocko

[kevinkr]

I've absolutely no doubt at all that asynchronously clocking spdif is the wrong way to go, I was just curious about the flip flop issue. Jocko, I will look for your posting on the other thread.

I can't talk to the Wadia issue, the last one I heard was at least 10 yrs ago, and for whatever reason, price and label on the front panel aside, I didn't like it.

Kevin

[Extreme_Boky]

Hi Dr. H,

Check this (excellent!) link. It explains a lot and will help you make your own decision. Try making it synchronous and see if the clicks disappear.
http://www.lessloss.com/types.html

Cheers,
Extreme_Boky

[Dr.H]

Thanks everyone,

I will try the following and report back:

Feeding 74hc74 with the cd players clock (synchronous reclock)
Reclocking with '74 AFTER 74HCT08

Jocko, any info on the SPDIF circuit you allueded to? Any diagrams perhaps?

Thanks
Ryan

[Elso Kwak]

Originally posted by Extreme_Boky
Hi Dr. H,

Check this (excellent!) link. It explains a lot and will help you make your own decision. Try making it synchronous and see if the clicks disappear.
http://www.lessloss.com/types.html

Cheers,
Extreme_Boky

The clicks are probably due to the metastability effect. Try my ASR with two flip-flops in series and that problem will be solved.

[Dr.H]

HI Elso,

Thanks, I meant to include that option as well. I noticed on Pedja Rogic's website that he uses the 74 in this way, i.e. d1 clocked to q1 which is input to d2 and clocked to q2, both lcocking processes using the same (asynchrocnous) clock.

Will report back

[rfbrw]

Originally posted by Extreme_Boky
Hi Dr. H,

Check this (excellent!) link. It explains a lot and will help you make your own decision. Try making it synchronous and see if the clicks disappear.
http://www.lessloss.com/types.html

Cheers,
Extreme_Boky

Alas, it appears to cover everything except what Dr.H is doing.

[Extreme_Boky]

I have built Pedja's DAC + reclocker.

I listened to basic DAC for 3-4 weeks and played with different capacitors and grounding topology. Once I was very happy with the basic DAC, I added Pedja's reclocker with EXCELENT result.
I will post my findings about different stages of my tuning and impressions about this DAC in general.

Just to add, this DAC & reclocker together with Audiomeca Memphisto II transport produced truly amazing results. I don't think there's any "digital" combination / stand-alone player out there that approaches analog closer than this combination.

Regards,
Extreme_Boky

[rfbrw]

Originally posted by Extreme_Boky
I have built Pedja's DAC + reclocker.

I listened to basic DAC for 3-4 weeks and played with different capacitors and grounding topology. Once I was very happy with the basic DAC, I added Pedja's reclocker with EXCELENT result.
I will post my findings about different stages of my tuning and impressions about this DAC in general.

Just to add, this DAC & reclocker together with Audiomeca Memphisto II transport produced truly amazing results. I don't think there's any "digital" combination / stand-alone player out there that approaches analog closer than this combination.

Regards,
Extreme_Boky

Fair enough, but asynchronously reclocking the spdif datastream at transmission is not a good idea.