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Anti-jitter RAM buffer in DACs, Which have one ?
Pio2001
post Aug 3 2003, 10:00
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In, http://www.tc.umn.edu/~erick205/Papers/pap...html#principles we can read about RAM buffers :

QUOTE
This process is referred to as timebase correction and as stated before, any quality piece of equipment will implement it.


That has been the ritual answer to jitter concerns since I'm on the Internet.

But... if "any quality piece of equipment will implement it", then some non-quality pieces of equipment don't implement it. My question is : which ones ?

The statement "quality piece of equipment" is completely subjective and doesn't give any information. For my grandfather, a "quality" CD reader will be a portable radio-cassette-CD-speakers combo for 100 $ in the supermarket. The "non-quality" one will be the Fisher-Price toy for children from 3 to 7.
For an audiophile friend, the "quality" CD player will be the 25,000 $ Wadia CD Transport+DAC, while any player under 1,500 $ is just worthless crap.

So, do a 200 $ CD Player always have a RAM buffer ? Or is it not considered a quality piece of equipment ? What about a 300 $ CD Player from 1990 ?
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F1Sushi
post Aug 4 2003, 13:44
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QUOTE (Halcyon @ Aug 4 2003, 04:36 AM)
Does this mean that their output does not contain jitter or that their internal DA conversion is immune to jitter?

No it does not. Jitter in DA stage is often linked to poor clock (deviation can be measured in hundreds of nanoseconds rather than hundreds of picoseconds), inadequate power filtering (e.g. power available to different parts modulates with the input data) and some other issues that can be avoided with a little bit more careful (and usually a little bit more expensive) electronics.

Does this mean such jitter in cheaper cd players is audible (now just talking about jitter, not I/V conversion, op amps and the analog stage after DAC in general)?

Somewhat debated area. Julian Dunn (in his Jitter Theory App Notes for Audiotech) has discussed the audibility of jitter at various levels using various signals.

I think a quick bit bit of clarification on clock jitter and DAC performance might be in order. The switched cap sigma delta architecture does a nice job of providing quite a bit of immunity to master clock jitter, so it's not uncommon to see DACs over the past few years boasting 100-500psec jitter figures, assuming a decent stable clock. Some current PLLDACs boast sub-100psec jitter figures with a clock async to the data stream.

Can people hear that? If they CAN, then they would probably benefit from the likes of a product like the Auric Illuminator...

Edit: a bit of clarification...

This post has been edited by F1Sushi: Aug 4 2003, 16:03
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Posts in this topic
- Pio2001   Anti-jitter RAM buffer in DACs   Aug 3 2003, 10:00
- - Patsoe   Since it's the cheapest thing, I can't ima...   Aug 3 2003, 19:58
- - F1Sushi   All CD players contain buffer memory between the E...   Aug 3 2003, 21:13
- - Halcyon   QUOTE As far as jitter at the DAC stage is concern...   Aug 4 2003, 09:36
- - 2Bdecided   Pio, I agree with the importance of your question...   Aug 4 2003, 11:27
- - F1Sushi   QUOTE (Pio2001 @ Aug 3 2003, 05:00 AM)So, do ...   Aug 4 2003, 12:53
- - F1Sushi   QUOTE (Halcyon @ Aug 4 2003, 04:36 AM)Does th...   Aug 4 2003, 13:44
- - Patsoe   Those are interesting side notes, F1Sushi. Could ...   Aug 4 2003, 14:05
- - F1Sushi   QUOTE (Patsoe @ Aug 4 2003, 09:05 AM)Those ar...   Aug 4 2003, 14:25
- - Patsoe   QUOTE (F1Sushi @ Aug 4 2003, 02:25 PM)http://...   Aug 4 2003, 14:44
- - Pio2001   Thanks, all of you for the answers. There was a pa...   Aug 4 2003, 14:54
- - F1Sushi   QUOTE (Patsoe @ Aug 4 2003, 09:44 AM)QUOTE As...   Aug 4 2003, 15:01
- - Pio2001   Sorry, I completely lost the link. It was an old s...   Aug 4 2003, 21:13
- - F1Sushi   QUOTE (Pio2001 @ Aug 4 2003, 04:13 PM)Sorry, ...   Aug 4 2003, 21:21
- - Pio2001   No sorry, there was no color, it was all about jit...   Aug 4 2003, 22:02
- - F1Sushi   QUOTE (Pio2001 @ Aug 4 2003, 05:02 PM)No sorr...   Aug 4 2003, 22:13
- - Halcyon   F1Sushi, thanks for the clarification! More ...   Aug 5 2003, 08:52
- - F1Sushi   QUOTE (F1Sushi @ Aug 4 2003, 04:21 PM)QUOTE (...   Aug 6 2003, 03:23
- - F1Sushi   QUOTE (Patsoe @ Aug 4 2003, 09:05 AM)Those ar...   Aug 6 2003, 04:10
- - Pio2001   QUOTE (F1Sushi @ Aug 6 2003, 05:23 AM)Could t...   Aug 6 2003, 12:49
- - TrNSZ   There is a device available from most high-end aud...   Aug 6 2003, 13:24
- - F1Sushi   QUOTE (TrNSZ @ Aug 6 2003, 08:24 AM)There is ...   Aug 6 2003, 14:17
- - F1Sushi   Found it - actually it's from Monarchy Audio, ...   Aug 6 2003, 14:36
- - Patsoe   Actually, from the description I'd suspect it ...   Aug 6 2003, 15:22
- - F1Sushi   QUOTE (Patsoe @ Aug 6 2003, 10:22 AM)Actually...   Aug 6 2003, 15:34
- - TrNSZ   To clarify on the "Monarchy Audio" DIP D...   Aug 6 2003, 15:57
- - F1Sushi   QUOTE (TrNSZ @ Aug 6 2003, 10:57 AM)To clarif...   Aug 6 2003, 16:20
- - 2Bdecided   In the current (September!) issue of Hi-Fi New...   Aug 6 2003, 16:32
- - F1Sushi   QUOTE (2Bdecided @ Aug 6 2003, 11:32 AM)The o...   Aug 6 2003, 16:42
- - Halcyon   2Bdecided, do you know of studies/measurements an...   Aug 6 2003, 19:25
- - F1Sushi   QUOTE (Halcyon @ Aug 6 2003, 02:25 PM)However...   Aug 6 2003, 19:44
- - Pio2001   You can always record an SPDIF output with an SB l...   Aug 6 2003, 21:19
- - Patsoe   QUOTE (F1Sushi @ Aug 6 2003, 03:34 PM)QUOTE (...   Aug 7 2003, 08:30
- - F1Sushi   My take on it is that the statement about "ab...   Aug 7 2003, 12:46
- - Patsoe   QUOTE (F1Sushi @ Aug 7 2003, 12:46 PM)Thought...   Aug 7 2003, 15:23
- - 2Bdecided   QUOTE (Patsoe @ Aug 7 2003, 02:23 PM)QUOTE (F...   Aug 7 2003, 15:36
- - F1Sushi   QUOTE (2Bdecided @ Aug 7 2003, 10:36 AM)QUOTE...   Aug 7 2003, 15:42
- - ChristianHJW   This thread confirms a couple of opinions i have s...   Aug 7 2003, 16:01
- - Patsoe   QUOTE (ChristianHJW @ Aug 7 2003, 04:01 PM).....   Aug 7 2003, 18:56
- - Halcyon   Shhh... don't tell them. It's reserved for...   Aug 7 2003, 20:09
- - F1Sushi   Just came across this link, which raises several t...   Aug 7 2003, 20:42
- - 2Bdecided   This thread should be in the FAQ! Cheers, Dav...   Aug 8 2003, 09:51
- - F1Sushi   Here's a Monarchy Audio DIP on a chip: http:/...   Aug 8 2003, 16:36
- - d_kay303   QUOTE (ChristianHJW @ Aug 7 2003, 07:01 AM)Th...   Aug 14 2003, 08:44
- - Patsoe   You're pointing out the exact reason why a two...   Aug 14 2003, 09:25
- - Pio2001   As 2Bdecided explained, this is only valid for che...   Aug 14 2003, 12:17


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