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Groups > comp.sys.sinclair > #2303

Re: CGC entry - one for the hardware types

From spike1@freenet.co.uk
Newsgroups comp.sys.sinclair
Subject Re: CGC entry - one for the hardware types
Date 2013-07-02 18:34 +0100
Organization The league against squirrels
Message-ID <thfbaa-6vc.ln1@librarian.sky.com> (permalink)
References <7df18821-3367-4674-ab9e-2a37b20c351d@googlegroups.com> <op.wzh14d0c34qdui@flay.home> <b3bo31F8ukjU1@mid.individual.net> <kqsoqb$1p3$1@dont-email.me>

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And verily, didst Guesser <alistair@alistairsserver.no-ip.org> hastily babble thusly:
> On 30/06/2013 23:00, Hanno Foest wrote:
>> Anyway, how is it done?
>>
>> Hanno
> 
> Oops, I missed this.
> 
> The short and techy answer is that the TV is unable to completely 
> separate the high frequency transitions in the luminance signal from the 
> modulated chrominance, so some of the black and white signal leaks into 
> the colour.
> 
> By generating a specific pattern on screen that high frequency cross 
> colour interference can be manipulated to make the TV generate stable 
> blocks of colour.
> 
> The effect is being caused by the limitations of the analogue video 
> circuitry and the way a PAL video signal works. Emulators of course 
> represent an ideal video signal with unlimited bandwidth etc and make no 
> attempt to accurately model a PAL signal :D

How about bunging up a youtube video showing the effect?... 

(won't work on my 128 cos the colour conked out yonks ago)
-- 
|   spike1@freenet.co.uk   | "I'm alive!!! I can touch! I can taste!         |
|   Andrew Halliwell BSc   |  I can SMELL!!!  KRYTEN!!! Unpack Rachel and    |
|            in            |  get out the puncture repair kit!"              |
|     Computer Science     |     Arnold Judas Rimmer- Red Dwarf              |

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Thread

CGC entry - one for the hardware types R-Tape <stonechatproductions@yahoo.co.uk> - 2013-06-30 01:15 -0700
  Re: CGC entry - one for the hardware types "Paul E Collins" <equi@cl4.invalid> - 2013-06-30 17:15 +0100
    Re: CGC entry - one for the hardware types Hanno Foest <hurga-news2@tigress.com> - 2013-07-01 00:00 +0200
      Re: CGC entry - one for the hardware types Guesser <alistair@alistairsserver.no-ip.org> - 2013-07-01 21:34 +0100
        Re: CGC entry - one for the hardware types spike1@freenet.co.uk - 2013-07-02 18:34 +0100
        Re: CGC entry - one for the hardware types "Chris Young" <chris.usenet@mail-filter.com> - 2013-07-02 19:18 +0100
          Re: CGC entry - one for the hardware types Guesser <alistair@alistairsserver.no-ip.org> - 2013-07-02 19:37 +0100
            Re: CGC entry - one for the hardware types SamTek <rogerjowett@gmail.com> - 2013-07-03 03:06 -0700
              Re: CGC entry - one for the hardware types Sophie Braine <choralmissy@gmail.com> - 2013-07-13 01:15 -0700
                Re: CGC entry - one for the hardware types korax1214@gmail.com - 2013-07-14 07:16 -0700
    Re: CGC entry - one for the hardware types Andrew Owen <aowen10@mail.bbk.ac.uk> - 2013-07-02 18:38 +0100
      Re: CGC entry - one for the hardware types "Chris Young" <chris.usenet@mail-filter.com> - 2013-07-02 19:19 +0100
      Re: CGC entry - one for the hardware types Guesser <alistair@alistairsserver.no-ip.org> - 2013-07-02 19:34 +0100
  Re: CGC entry - one for the hardware types ec429 <ec429@cantab.ac.uk> - 2013-08-28 00:57 +0100
    Re: CGC entry - one for the hardware types Guesser <alistair@alistairsserver.no-ip.org> - 2013-08-28 02:55 +0100

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