From: John Woodgate
Subject: Re: Digital divide by ten, 1949 style
Date: Mon, 23 Sep 2002 08:29:29 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 23 Sep 2002 10:11:28 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Philip Nasadowski
wrote (in ) about 'Digital
divide by ten, 1949 style', on Sun, 22 Sep 2002:
>In article ,
> John Woodgate wrote:
>> Well, it started like that, but that simple modification doesn't work.
>> So other bells and whistles were added.
The colour-difference signals are very different. The colour sub-carrier
is offset from a multiple of the horizontal frequency. Over an 8-field
sequence, there is a pattern of alternation of the burst phase.
>Does *anyone* outside of France or Russia even understand SECAM? Do the
>French understand it? Did the inventor understand it?
Well, the original concept has been changed a great deal in making the
system actually used.
> It's a bizzare
>system that seems to be poorly documented :(
The old CCIR Report 624-4 includes a description. I don't know whether a
later version (ITU-R something?) exists.
>When you read a description of PAL, it seems almost like NTSC, just
>modified for European tastes.
Well modified for all tastes, I would say. (;-)
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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