What is Jitter?

Discussion in 'Archived Threads 2001-2004' started by DanielSmi, Aug 22, 2002.

  1. DanielSmi

    DanielSmi Second Unit

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    I know vaguely what it's about something with the 1, and 0's not being packaged together as bytes instead being transferred as bits indiviually so there's no checks or sums (what are checks and sums?), then something happens and it has a negative effect on the audio? What is that negative effect? If you have good DAC's will these help the jitter problem? I have the burr brown pcm1704's in my 49tx. Is there anything the cd or dvd-a player can do to prevent jitter? I know about those thing you can buy (de-jitterizer's) and put in between the cd player and receiver what are they, do they do anything a good DAC can't do? If the do do something the dac can't do you think they are worth the money? That's all I can think of right now, I know someone has to know these answers? Or maybe you could give me a link to a site that'll explain it all. Thanx in advance.

    Daniel Smith
     
  2. Jeff Kleist

    Jeff Kleist Executive Producer

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    jitter has to do with the actual medium moving because of vibrations, not jitter in the signal
     
  3. Adam Barratt

    Adam Barratt Cinematographer

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    Actually, jitter is all about the signal (or rather signal timing). Take a look at this article for an overview of jitter and digital audio.
    Adam
     
  4. KeithH

    KeithH Lead Actor

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    Jitter is sometimes referred to timing errors. It is an error in that 1s and 0s are not fed at the right time, and this leads to a degradation of the sound. CD players have a clock mechanism that handles timing of data transfer. (This is an extremely layman's way of describing this aspect of a CD player's design.) Some players have better clocks than others. Transport design is also said to contribute to or minimize jitter. For more on the subject, go to www.jitter.de .
     
  5. Kevin C Brown

    Kevin C Brown Producer

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    I 2nd Keith's suggestion to look at www.jitter.de . A very good explanation.
    BTW, there is also a version of "jitter" when talking about digital audio extraction, CD-ROM drives, etc. That may be what Jeff is talking about. That is not the correct use of the term though. More info here:
    http://www.cdrfaq.org/faq02.html#S2-15
     
  6. David*RT

    David*RT Stunt Coordinator

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    Jitter is short for Jitter-Bug....a dance form that was popular during the early part of the 20th century. [​IMG]
     
  7. Lewis Besze

    Lewis Besze Producer

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    While jitter is a fact, and measurable,it's audible effects are largely debatable,since this error happens in the digital domain.Of course I'm talking about the avarage and better, jitter figures,usually measured in pico seconds.
     

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