Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!hplabs!hpda!hpcupt1!lamont
From: lamont@hpcupt1.HP.COM (LaMont Jones)
Newsgroups: sci.crypt
Subject: Re: Scrambling of Pay TV channels
Message-ID: <7820004@hpcupt1.HP.COM>
Date: 27 Apr 88 01:45:07 GMT
References: <735@trwspf.TRW.COM>
Organization: Hewlett Packard, Cupertino
Lines: 17

bebop@trwspf.TRW.COM (Allen Takatsuka) writes:
>Does anyone know what types of schemes are used to scramble pay TV?  Are there
>different schemes depending on whether transmission is for cable-TV or for
>microwave transmission?
	One of the common techniques is to suppress the sync pulse by 6db
or more.  Then they broadcast a 15.75kHz signal in sync with the sync pulse
on the audio.  It is also common to reverse the video and audio in the 6Mhz
bandwidth.

>Also, can anyone summarize what the current state of the law on this
>subject may be?
	No idea.

LaMont Jones
lamont@hpda.hp.com
{hplabs,uunet,...}!hpda!lamont

These in no way reflect Hewlett Packard's opinions.