Computer Audio Asylum

RE: Abe, Here is My Take on the REGEN and Jitterbug

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In Reply to: RE: Abe, Here is My Take on the REGEN and Jitterbug posted by Fitzcaraldo215 on September 22, 2015 at 07:45:14

you state that the Jitterbug "measurably reduces jitter and packet errors".

Steve didn't say that. He said that "AudioQuest claims that this small device [Snip] measurably reduces jitter and packet errors". Different thing from where I'm sitting.

But where are those measurements you allude to

You could always ask Audioquest. Steve seems to have quoted them correctly. He's a reviewer, not an apologist.

Follow Ups:

RE: Abe, Here is My Take on the REGEN and Jitterbug - Tony Lauck 10:35:21 09/22/15 (6)
If we are talking about data errors, then it shouldn't be too difficult to demonstrate that a filter may reduce data errors in some circumstances. One needs to start with a suitably marginal signal and apply the small correction provided by the device. (Or one starts with a suitably marginal receiver.) It seems unlikely, however, that data errors would be "reduced" on any normal USB setup, since USB data errors can be expected to be extremely rare, barring defective devices or cabling or partially seated connectors.

I've seen "data errors" on my USB DAC by looking at driver statistics, but these were traced down to buffer sizing issues, i.e. they were software problems unrelated to any analog signal quality issues.

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
- software problems unrelated to any analog signal quality issues. - fmak 10:49:53 09/22/15 (5)
  How have you deduced this?
  - RE: software problems unrelated to any analog signal quality issues. - Tony Lauck 11:03:48 09/22/15 (4)
    I was getting CRC errors (on the link from the Mytek back to the computer). These depended on the buffer sizing and other activity going on in the computer. The problems went away when the buffers were made somewhat larger. They also went away, if I removed the CPU load that I was generating for experimental purposes.
    
    This is not solid proof of software causation and it doesn't identify which software might be defective (OS, driver, DAC USB firmware), but it seems a plausible deduction. Other hints include watching the error counters increment while doing specific things, e.g. running Firefox with a complex web page and using the mouse to scroll the window. The idea was to create various quasi-random stress on the system and see what happens, with the goal to discover the system limits by "breaking". [Something OK with a computer system, not advisable when operating a vehicle or aircraft. :) ]
    
    Tony Lauck
    
    "Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
    - This is why - fmak 23:32:08 09/22/15 (3)
      I have not been happy with the Mytek. With XMOS devices I can easily make it go away using the Spy function with the software.
      
      I have been doing video clean-up on my deskstop PC with up to 95% cpu load on all 4 cores. Curiously, this has not affected audio playback at all, with zero interference and good sound thru a TEAC UD501 on KS, with minimal buffers.
      - RE: This is why - Tony Lauck 13:01:53 09/23/15 (1)
        
        In Reply to: RE: This is why posted by fmak on September 22, 2015 at 23:32:08
        
        "I have not been happy with the Mytek. With XMOS devices I can easily make it go away using the Spy function with the software."
        
        I don't understand your statement. Could you please explain what you are doing and what goes wrong?
        
        Tony Lauck
        
        "Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
        
        RE: This is why - fmak 21:35:40 09/23/15 (0)
        
        In Reply to: RE: This is why posted by Tony Lauck on September 23, 2015 at 13:01:53
        
        With some XMOS devices I can use a more functional CPL to alter buffer sizes and get rid of any reported error.
      - RE: This is why - AbeCollins 06:38:46 09/23/15 (0)
        
        In Reply to: RE: This is why posted by fmak on September 22, 2015 at 23:32:08
        
        I have been doing video clean-up on my deskstop PC with up to 95% cpu load on all 4 cores. Curiously, this has not affected audio playback at all, with zero interference and good sound thru a TEAC UD501 on KS, with minimal buffers.
        
        As a test I've run multiple various tasks simultaneously on the Mac while playing hi-res music with no issues at all. It made me wonder what others were doing wrong, or what software problems they may have, when they complained about audio dropouts.
RE: Abe, Here is My Take on the REGEN and Jitterbug - Fitzcaraldo215 08:21:19 09/22/15 (0)
Agreed, Steve did say these were claims by AQ. I think it clear that the onus is on them to provide measurements if they claim to have them, which is what I said.

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