Toshiba RDXS32 / Themescene H30 lipsynch problem

Discussion in 'Blu-ray & DVD Players & Recorders' started by trainspotter, Jul 16, 2004.

  1. trainspotter

    trainspotter
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    posted on two threads as i do not know where problem lies.

    I have a Lip synch problem with my set up when watching sky through my projector, In order to minimimise cabling i am looping the picture through my DVD recorder.

    Picture:

    Sky+ --->> Toshiba RDXS32 (via RGB Scart)
    Toshiba RDXS32 --->>Optoma Themescene H30 projector (via component)

    Sound:

    Sky+ -----> Sony STRDB940 (via optical lead)

    The end result is unbearable, when i am watching a DVD its not so bad, but that is noticable. Any Ideas what I am doing wrong???
     
  2. tabatha

    tabatha
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    The problem is caused by the additional delay of the encoding and decoding process for the picture going through the RDXS32 even though you are not using timeslip. HDD and DVD recorders take time to process the video and sound and circuitry in the HDD/DVD makes sure that although they are both delayed (and probably by different amounts!) they both come out in sync.

    You are effectively delaying the video through the RDXS32 but have less delay for the audio as you are bypassing the RDXS32. I am very surprised that you have a problem with playing a DVD as I have not noticed any problem with the Toshiba in this area. I assume that you are using the Toslink optical for the best audio quality you can get.

    The easiest solution is to "go analogue" taking the audio through the RDXS32 so that the video and audio are subject to the same overall delay.

    This problem is very common in broadcast television where the audio is delayed in the broadcast chain far less than the video and specialised "delay" devices are produced to ensure that the sound does not arrive before the picture which has usually gone through a number of mixer/frame store/overlay devices which all cause additional delays due to processing time.

    Sorry I can't help further but at least you know you are not doing anyything "wrong" as such - it's just the way the equipment works - isn't digital wonderful !!!!!
     
  3. trainspotter

    trainspotter
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    thanks for the reply, I will give it a try. However does this mean that when watching Sky movies 1,2 or 3, I will lose the dolby digital soundtrack? many thanks
     

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