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

Date: Wed, 06 Sep 2017 19:47:17 +0200
Message-ID: <>
Sent from mobile device. Please have understanding.

On 6 September 2017 14:20:05 CEST, Mia Magnusson <> wrote:
>> This is on a 250466, don't know what exactly (what circuit) sits in
>> the modulator there. While obviously the signal is far less clean
>> from a 64 than from the generator, the results seem to be:
>> - C alone and C on the composite seem to be almost exactly the
>> reversed phase.
>> - the "almost" is about plus 17ns for the composite C
>Should this be counted as a simple phase inversion

Looks like simple inversion. Then a delay about 17ns. 

>> - Y alone and Y on the composite seem to be about 23ns apart
>> - the "settling"[*] on composite is noticeably longer with some
>> ringing
>> That makes it about 6ns difference in Y/C luma-chroma time relation
>> between the separated and composite.
>How does it compare to a reference signal though?

As mentioned earlier, on the reference there is virtually no difference. At least none that I would be able to measure using the simple oscilloscope measurement method. 

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Received on 2017-09-06 18:04:14

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