Article View: sci.crypt
Article #4206Re: Scrambling of Pay TV channels
From: LaMont Jones
Date: Wed, 27 Apr 1988 01:45
Date: Wed, 27 Apr 1988 01:45
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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.
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Path: arc1-ca.pugleaf.net!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