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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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13th Jan 2019, 2:15 pm | #41 | ||
Nonode
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,681
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Re: External Teletext Decoder. Is there such a thing?
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Chris
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13th Jan 2019, 2:32 pm | #42 | |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: External Teletext Decoder. Is there such a thing?
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13th Jan 2019, 7:30 pm | #43 |
Nonode
Join Date: Mar 2010
Location: Sunderland, Tyne and Wear, UK.
Posts: 2,476
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Re: External Teletext Decoder. Is there such a thing?
The ICC5 was unusual in this (amongst other) department/s, as to enable the text (and OSG) or external RGB inputs via the scart to be brightness and contrast adjusted by the video processor IC, the RGB was first converted to YUV internally (matrix 1), then after internal processing was converted back to RGB in matrix 2 to drive the tube base output stages in the usual way and consequently the cathodes of the crt itself.
this IC could handle only two RGB input channels, ie. a two into one switch, the scart RGB input took priority, there was no capability to output RGB to the scart.
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I don't suffer from Insanity. I enjoy every minute of it. Last edited by Red to black; 13th Jan 2019 at 7:45 pm. Reason: added attachment etc |
13th Jan 2019, 9:59 pm | #44 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: External Teletext Decoder. Is there such a thing?
The infamous HA11498 decoder chip, also made by Telefunken as U4606, U4646 and/or U4647 I seem to remember. It's coming back to memory now.
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