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S/P-dif,AES/EBU over Cat.5 ?

Discussion in 'Electronic Design' started by [email protected], Sep 15, 2005.

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  1. Guest

    Would this setup work?
    Ie sending AES/EBU audio data over cat.5 cable.

    Soundcard "S/P-dif,AES/EBU" TTL-level
    |
    \|/
    Line driver (LTC485 or similar RS-422 compatible driver)
    |
    \|/
    1:1 Transformer (Like Pulse H1012)
    |
    \|/
    < 100m cat.5 ethernet wireing
    |
    \|/
    1:1 Transformer (Like Pulse H1012)
    |
    \|/
    Line receiver (LTC485 or similar RS-422 compatible driver)
    |
    \|/
    Toslink transmitter (TOTX179P or ekvialient)

    The LTC485 is specified at 2.5Mbps maximum. But maybe there is some margin to
    use if cable runs are short (<20m) ?

    I prefer to have optical the last bit to the amplifier due fitting to existing
    installation. Galvanic insulation is also a benefit ofcourse.

    Ref:
    http://www.elfa.se/pdf/73/734/07348501.pdf LTC485
    http://www.elfa.se/pdf/75/07536550.pdf TOTX179P
     
  2. On 15 Sep 2005 21:36:37 GMT, in sci.electronics.design
    Done all the time, see epanorama.net for winding cheap aes/ebu
    transformers.
    If you have transformers, you already have galvanic isolation.
    choose a driver /receiver that is pin compatable with faster versions,
    if you run into probs. probably stuff already made on the Kramer site


    martin
     
  3. martin griffith wrote...
    Transformer coupling is done all the time for AES/EBU, with its
    biphase-mark data coding, but is that also true for S/P-dif? We
    see either TTL or optical, but generally neither of those two is
    ac-coupled, isn't that so? I'm trying to remember the spdif
    waveforms, are they biphase-mark coded as well?.
     
  4. specified at 2.5Mbps maximum. But maybe there is some margin to
    just been brushing up on spdif etc, been some time, but

    "The CS8416 includes an AES3/SPDIF digital audio receiver. The
    receiver accepts and decodes bi-phase encoded
    audio and digital data according to the AES3, IEC60958 (S/PDIF), and
    EIAJ CP-1201 interface standards."

    If its biphase, transformers are ok in my book


    martin
     
  5. Guest

    Winfield Hill skrev:
    http://www.epanorama.net/documents/audio/spdif.html

    -Lasse
     
  6. http://www.epanorama.net/documents/audio/spdif.html

    -Lasse[/QUOTE]
    thats the one!


    martin
     
  7. Pooh Bear

    Pooh Bear Guest

    SP/DIF is in effect simply a subset of AES/EBU IIRC.

    I believe it has no trouble being transformer coupled. Although I fail to see any
    good reason to do so since the shield connection is also ground anyway.

    Graham
     
  8. Guest

    I have seen epanorama's spdif stuff. But there is no schematic info on aes/ebu.
    Anyway should I place a 100 ohm resistor parallel to the output of the
    line driver?, or can I just wire the line driver straight to a pulse
    transformers primary side from an old ethernet card?
    I think I'll have to do some "birdnest" wireing to test things.. ;)
     
  9. Pooh Bear

    Pooh Bear Guest

    I suggest you follow the advice that you'll typically find on one the Crystal
    devices datasheets ( made by Cirrus Logic ) .

    Don't bother with transformers. Not necessary unless galvanic isolation is a must.

    Graham
     
  10. On 16 Sep 2005 00:25:22 GMT, in sci.electronics.design
    someone said
    Spice. It can show you a rose garden and then on the breadboard it's
    all weeds.

    Good bit of breadboarding........... yep

    SPDIF is just a digital signal, nothing special about it , unless you
    go to stereophoole.com, for a lateral quasimodulated LSB with quantum
    dither


    martin
     
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