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From: msc@qubix.UUCP (Mark Callow)
Newsgroups: net.video
Subject: Re: PAL <==> NTSC
Message-ID: <988@qubix.UUCP>
Date: Fri, 13-Apr-84 00:09:27 EST
Article-I.D.: qubix.988
Posted: Fri Apr 13 00:09:27 1984
Date-Received: Sat, 14-Apr-84 08:16:43 EST
References: <7019@decwrl.UUCP>
Organization: Qubix Graphic Systems, Saratoga, CA
Lines: 33

>	From: hughes@mother.DEC (Gary Hughes - CSSE uVAX & AI Systems Group)
>
>	Psuvm%iks asked whether it is possible to convert a PAL
>	cassette to NTSC or to play a PAL cassette on something that
>	also works with NTSC.
>
>	The answer in both cases is yes.
>
>	There are a number of professional video service companies that
>	will convert from one format to another for a fee. I'm not sure
>	how they do it but my guess is they decode the signal to RGB
>	and the re-encode into the format you require. I don't know
>	whether this introduces a timing problem due to PAL using a
>	50Hz synch pulse and NTSC using a 60Hz synch.

I replied privately to the original question  but I just want to clear
up how the conversion is done.

The suggestion given above would not work due, among many things, to the
different number of scan lines in the pictures.

The actual black box used is called a field store standards converter.
It digitizes one field and stores it.  From the digitized image it
reconstructs the field in the new format.  It does all this in real
time and is *expensive*.

BTW thanks for the information about the multi-standard tv's and vtr's.
-- 
From the Tardis of Mark Callow
msc@qubix.UUCP,  decwrl!qubix!msc@Berkeley.ARPA
...{decvax,ucbvax,ihnp4}!decwrl!qubix!msc, ...{ittvax,amd70}!qubix!msc

"I'm a citizen of the Universe, and a gentleman to boot."