digital throughput

Discussion in 'AV Receivers' started by Wayde_R, Apr 22, 2004.

  1. Wayde_R

    Wayde_R Stunt Coordinator

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    Does anyone know what the throughput of a digital output on a DVD player would be?

    The highest frequency a digital audio out has to deal with is when playing DTS 96/24 DVD which is the highest resolution that passes through a digital optical output. The real hi res formats require analogue because they "say" digital outputs aren't capable, but it appears DTS gets around this. Or more likely it's an industry lie as they wait for secure methods like HDMI but that's beside my point.

    So, if five channels at 96Khz and one (.1) is 9.6Khz. This means a total bandwidth of 489.6 KHz at 24bit (=11750.4) this means a total throughput of 12Megs per second (rounded up) has passed through a digital output on a DVD player.

    Does this sound correct or is my thinking on this flawed? I'm sure these numbers have been determined before.

    I am trying to compare it to a SCSI bus which has a max throughput of 13M per second which means they're about the same. Please let me know if I'm wrong and why.

    Thank you
    Wayde
     
  2. John Royster

    John Royster Screenwriter

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    I "think" toslink is limited to 5 Mbs (transmitter and receiver limitation) and coax can handle up to 45 Mbs.

    This is where firewire and ethernet come in.
     
  3. Roger Dressler

    Roger Dressler Stunt Coordinator

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    5.1 channels in PCM is the same as 6 channels. For 96/24, the data rate is 13.8 Mbps. No lie.

    DTS needs less data because it is not PCM, but lossy (perceptual) encoded audio. However, if you decode DTS 96/24 and then output it on HDMI, it also uses 13.8 Mbps.
     
  4. Wayde_R

    Wayde_R Stunt Coordinator

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    Thank you for that definitive answer Roger.
     

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