Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 (Tek) 9/26/83; site shark.UUCP
Path: utzoo!linus!decvax!microsoft!uw-beaver!tektronix!orca!shark!davew
From: davew@shark.UUCP (Dave Williams)
Newsgroups: net.video
Subject: Re: French Video tapes
Message-ID: <187@shark.UUCP>
Date: Wed, 4-Jan-84 15:54:33 EST
Article-I.D.: shark.187
Posted: Wed Jan  4 15:54:33 1984
Date-Received: Fri, 6-Jan-84 04:25:39 EST
References: <306@crystal.ARPA>
Organization: Tektronix, Wilsonville OR.
Lines: 25

_______________________________________________

Another problem faced by the person wishing to
playback tapes recorded in France (SECAM) on
US vcr's (NTSC) is the fact that most European
countries have a 50 Hertz electric supply
system while North America uses 60 Hertz.
As a result NTSC systems use a 30 frame per second
format (60 fields). Both PAL and SECAM use 25
frames per second (50 fields) as the television
set is locked to the line frequency. This is why
when the SECAM tapes were played back on an
NTSC machine the sound sounded speeded up. The
phase lock loop in the vcr was trying to sync
the tape up to the 30 fps format and was causing
the tape to run approx 17% faster.
 I believe there is a company in New York City
that will duplicate tapes from various formats.
This is the only method I know of for playing
foreign tapes without expensive equipment.
                         Dave Williams
                         Tektronix, Inc.
                         ECS