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Analogue TV delayed?

Discussion in 'Hobby Electronics' started by Phil Allison, Nov 18, 2012.

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  1. Phil Allison

    Phil Allison Guest

    ** Hi,

    Normally there used to be a 1 to 2 second delay between the images and sound
    on a digital TV as compared to an analogue one tuned to the same program.
    But in Sydney at least, this is not true any more.

    With the two sets I have, ABC1 shows no time delay.

    Ch 7 digital shows about 1 second, ch 9 digital about 100mS and ch 10
    digital a whopping 3 seconds.

    If you have an analogue TV and digital TV available, you can check this out.

    Weird - eh ?


    .... Phil
     
  2. **When I was working in a mate's TV repair shop a couple of years back,
    we noticed that the delay from Channel 10 was incredibly long. Certainly
    in the order of 3 - 5 seconds. The other channels were no where near as
    long, but the delay was certainly noticable.
     
  3. Sylvia Else

    Sylvia Else Guest

    My best guess would be that the analogue signal is now being produced by
    running a decoder on the digital signal, so that whether you're watching
    analogue or digital, you have the same inherent delay, with the only
    difference being where the decoder is physically located.

    If this is correct, then on analogue one should see the same obvious
    compression artefacts in content with rapidly changing illumination
    (discos, reporter's camera flashes, etc.).

    Sylvia.
     
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