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Audio delay circuit for digital audio (dolby 5.1 toslink or digital Jack)

Discussion in 'Electronic Design' started by bunky, Oct 31, 2005.

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  1. bunky

    bunky Guest

    I have need for an audio delay line that could take a dolby 5.1 optical
    (Toslink or rca digital out) about 200khz signal and delay the signal a
    frame or two to keep the lip sync with the Video.

    When the digital audio output of my Dish HDTV receiver is connected to
    my surround receiver's optical input, the sound is a frame or two ahead
    of the audio due to the HDTV delaying the video a frame or two while it
    upconverts to 1080P.

    The frames are 1/30th second. therefore three frames would be 1/10th
    second or 100ms which would be more than enough delay.

    I have seen that the newer 1080 I upconverting DVD players have an
    audio delay of 0 to 100ms in 10 ms steps in their audio setup menue, so
    I know that someone knows how to do it.

    I have been researching SAD 1024 bucket bagade chips.

    The data says a clock of up to 1.5 MHZ can be used.

    I see that these are obsolete chips.

    Anyone have a simple idea of parts and basic circuit that I could use.

    Any ideas would be greatly appreciated.

    Thanks Bunky
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