Re: Difference in luma-chroma delay of C64/C128 compared to standard S-video

From: Mia Magnusson <>
Date: Sat, 2 Sep 2017 03:58:46 +0200
Message-ID: <>
Den Fri, 1 Sep 2017 20:55:49 +0200 skrev HÁRSFALVI Levente
> "...The Y’ and C components should be time-coincident
> within ±25 ns. Error in chroma timing is known as
> chroma-luma delay. "

That explains why there are 45ns steps in the TDA 4565.

> So, to answer one of the original questions, the luma-chroma delay of
> standard composite and separate Y/C video should be 0 ns within a +-25
> ns margin.

But that only says how the timing should be on Y/C, not on composite.

We can assume that C64/C128 uses "composite" timing for Y/C, as the Y
and C signals is basically combined with about the same timing for
both. And the composite signal of a PAL C64 is imho really good; I've
never seen any timing errors there.

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Received on 2017-09-02 02:00:52

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