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Article #667Re: NTSC-PAL (in)compatibility
From: Isaac S Wingfield
Date: Thu, 22 Jun 1989 21:51
Date: Thu, 22 Jun 1989 21:51
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As I remember, PAL stands for Phase Alternate Line, and does just that. The 3.58 MHz color subcarrier flips phase by 180 deg after each line, and to recover the signal properly, the receiver needs to have a 1-line (63 uSec) delay line which is kicked in on alternate lines to straighten things out. The (supposed) justification for this is to average out phase errors incurred during the distribution of the signal. I believe PAL sets have no "tint" control (everything's perfect; you don't need it). Interesting sidenote: despite all the "improvements" brought about by PAL or secam, the best commercially broadcast stuff around used to be (maybe still is) in Japan, where they use the old, kludgy NTSC system invented here. They just pay attention to the adjustments and keep it tweaked up real good. (NTSC = "never twice same color") Isaac isw@cup.portal.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!usc!cs.utexas.edu!uunet!portal!cup.portal.com!ISW From: ISW@cup.portal.com (Isaac S Wingfield) Newsgroups: sci.electronics Subject: Re: NTSC-PAL (in)compatibility Message-ID: <19790@cup.portal.com> Date: 22 Jun 89 21:51:00 GMT References: <124@nisca.ircc.ohio-state.edu> <11170019@hpfcdj.HP.COM> Distribution: na Organization: The Portal System (TM) Lines: 19