Amusing Myself with how simple certain things can be solved with a circuit !-)
See "WonderWhatThisIsGoodFor.pdf" on the S.E.D/Schematics page of my website.
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
Looks to me like a complicated field sync generator for a TV. ? regards john
[snip]
Look more closely... the Input Signal is at the bottom of the page, the output signal is at the top.
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
I'm a little confused as to where the output is, but I'd say its either a video scrambler or a descrambler. MUNGED looks like a scrambled signal in that the horizontal sync pulse (front porch, sync tip, back porch, and presumably color burst) are "pushed up" into the video field, but only for the non-vertical sync portion of the field.
TV's cannot distinguish the horitonal sync from the video content, and that results in 'tearing' of the image. However, its important that the field be understood during the VITS interval so that the video decrambler can receive the digital information on which channels to descramble.
The descramblers frequently use the stereo pilot (modified from 19KHz to
15750Hz (or so, I forget)), which is transmitted synchronous with the horizontal sync from the original video feed and use it to "push down" the horitontal sync back into place.Am I Right? Do I win a prize!!! :~) Dana
Since you don't tell us what it does it's good for nothing. That makes you a crossposting troll. Congratulations.
Closest I can guess is it provides a trigger pulse for fields 1 or 5 on a PAL/NTSC/SECAM system.
Pray And Learn Never The Same Color (sic) Twice Sometimes Even Colour Appears Momentarily
That's only because someone else designed one and I got to build it back in..... oooh 1982 on a degree placement.. It wasn't a spice model and it worked. It came with another bunch of stuff in CMOS that selected a particular line from a particular field that triggered the thing that recorded it.
Clever bloke, learnt some shit.
DNA
If you read my shit
-- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com).
Rarely, you're generally so rude I think you must be French ;-)
The circuit extracts sync from a (Jerrold-style) suppressed sync signal. Uses two one-shots and some gating. Once sync is found in the (clean) VBI it know where to look thenceforth by suppressing the garbage in the next ~63.5us, re-syncing the one-shots each line.
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
you a
Didn't understand that so..... 'it's f*ck all use'.
Excellent. Where can I not buy one? :>)
DNA
-- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com).
So, I got it right then! WooHoo! Dana
you a
I heard....
Pale And Lukewarm No Two Similar Colours Sickly European Colour Almost Monochrome
Chris
Never Twice the Same Colour System Essentially Contrary to the American Method Perfection At Last
-- Peter Bennett VE7CEI GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
I pulled it as potentially illegal. Don't know why I had the urge to post it in the first place.
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
In article , Jim-T@golana- will-get-you.com mentioned...
Should be between Water... and WWVB..., but I don't see it.
-- @@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@ ###Got a Question about ELECTRONICS? Check HERE First:###
Some eastern European is furiously at work making it into a kit for sale by SPAM right now.........
Could be, but there's several required elements missing from the "conceptual" representation that a non-EE would have real problems with.
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
Oxymoron
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