[sdiy] Re: [AH] analog video synthesizers

[Magnus Danielson]

From: Rotwang the Mad Inventor <polarn-p at acc.umu.se>
Subject: Re: [sdiy] Re: [AH] analog video synthesizers
Date: Sun, 26 May 2002 20:47:44 +0200

> Videre non videri!

Monsieur Rotwang!

> At least we PAL users may hook a modular to a video system...
> Velleman, Belgium have a proc amp kit which would easily transform into a 
> video encoder/decoder.

Indeed. It is worth the effort to dig out the datasheets, since the chips
themselfs is capable of more than Velleman used them fore. This is a kit doomed
for heavy hacking for those having that kind of feelings in them (hehehe...).

> You may feed it with any video signal, perhaps blackburst from your 
> production facility master clock, and get sync out. An LM1881 will do that 
> trick too. Sync up your bank of favourite oscillators and feed them right 
> into the RGB input of the video encoder. Ta-daaa you may now follow in the 
> footsteps of Tangerine Dream, Severed Heads and more...

OUPS! ;O)

> Decoder part:
> http://www.acc.umu.se/~polarn-p/sas/video/videoprocessor/sid12.gif
> Encoder part:
> http://www.acc.umu.se/~polarn-p/sas/video/videoprocessor/sid13.gif
> 
> Velleman kit K4600:
> http://www.velleman.be/Product.asp?lan=1&id=9229
> 
> Not too expensive either. I paid around 120 euro for the kit. I will place 
> it behind a 6HE/14TE panel with all signals in and out tied to 75ohm BNCs 
> at the front.

Have you come around to bend it yeat?

For anyone interested in video, I can recommend to dig into the archives at
EBU. They have lots of usefull information available for free download in PDF
format. Amongst them is a great handbook for TV production which was a
prerequesit for TV companies in the UK. It is full of test-cases, which helps
to make you understand what is happening. Tektronix has a lovely app note on
how (the hell) to measure PAL signals. I haven't compared them, but I think
for many things they are about equal. Regardless, they are both around - get
them!

Cheers,
Magnus - occasionally looking into video stuff