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- Xref: sparky sci.electronics:15572 rec.video:11213
- Path: sparky!uunet!ogicse!uwm.edu!psuvax1!rutgers!spcvxb.spc.edu!killeen
- From: killeen@spcvxb.spc.edu (Jeff Killeen)
- Newsgroups: sci.electronics,rec.video
- Subject: Re: Macrovision
- Message-ID: <1992Sep12.011726.3846@spcvxb.spc.edu>
- Date: 12 Sep 92 05:17:25 GMT
- Article-I.D.: spcvxb.1992Sep12.011726.3846
- References: <1992Sep2.041037.347@u.washington.edu> <1992Sep2.133450.18671@panix.com> <2859@perl-sun.dwrsun4.UUCP>
- Organization: SPC Community Access System
- Lines: 25
-
- In article <2859@perl-sun.dwrsun4.UUCP>, perl@dwrsun4.UUCP (Robert Perlberg) writes:
- > In article <1992Sep2.133450.18671@panix.com>, schuster@panix.com (Michael Schuster) writes:
- >> Macrovision inserts very bright pulses in the vertical blank interval.
- >> Most VCR's use this when setting AGC video level, and get fooled into
- >> thinking the video levle is much brighter than the picture area really
- >> is. Most TV's don't. Dunno why.
- >
- > Some years ago a VCR maker (forgot which one) came out with a machine
- > which used a different kind of AGC circuit which was not affected by
- > Macrovision. It was not their intention to defeat Macrovision, it just
- > worked out that way because Macrovision takes advantage of an
- > unintended behavioral characteristic of the extant AGC circuit. The
- > Macrovision people complained and the VCR maker modified the new
- > circuit so that it would reject a Macrovision signal.
-
- Keep in mind 8mm and Hi8mm units are _not_ effected by Macrovision. Owners of
- Sony GV-8/200/300/500's have long ago discovered this happy fact. Also I
- believe all Beta units are safe from Macrovision.
-
- And if case you are thinking of it...
-
- VHS tape -> 8mm tape -> VHS tape
-
- ... won't cut out the Macrovision. Even though the 8mm VCR will play the tape
- back fine it still records the Macrovision junk.
-