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'[EE:] Video overlay question'
2004\07\09@194735 by fred jones

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Hi all,
I am interested in overlaying text on a video source.  The STV5730A fits the
bill perfectly.  The only problem is that it is discontinued.  Does anyone
know of a chip that can be interfaced to a PIC and overlay text on a video
source like the STV5730A?  I haven't been successful finding one except for
the BU5963AS.  Can't find anything on that one except a datasheet...no
source for it though.  Thanks for any help.
FJ

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2004\07\09@205817 by Bob Axtell

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Look at Mitsubitsi (sp?) MB35060-002SP. But I'm told it is being
dropped, too, available now only in DIP.

I designed the STV5730A into literally thousands of active products.
Yet, not only will ST not manufacture it anymore, they won't license it
so that smaller chip makers can make it, either. I and other designers
have begged ST to continue the product, but to no avail.

Its a serious problem. Phillips has a few products based on the 8051
with a small overlay generator, and one catches glimpses of a Japanese
source here and there; Zilog has some but the characters are much too
big for law enforcement (my application). I was hoping the DSPic would
be capable of doing something, but the PSPic's speed is nowhere near
fast enough to directly write to the screen. Even the Ubicom is too
slow.

Using a FPGA and an LM1881 (timing extractor), an 18F PIC can control
the writing of pixels into an NTSC or PAL screen. Its just a lot of work
and it takes a lot of board space, too.

Let us know what you run across.

--Bob

fred jones wrote:
{Quote hidden}

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2004\07\09@211105 by Lee McLaren

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Hi Bob,

If you only need single colour charaters you can get 64 in one line across
using from memory a 16c73 running in spec. They are a bit hard to read with
the res of the tv monitor but the quality of the output is spot on.
Lots of tricks involved but worked very well, long time ago I wrote a time
stamp to overlay on video, not sure if I got overlay sync to work but it was
creating its own sync etc.

Let me know if intrested and I will try to dig it up.

regards


Lee McLaren.

{Original Message removed}

2004\07\09@212142 by Bob Axtell

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Lee, I'd like to see that and many others would as well. 18Fs have lots
of RAM so that is no longer an issue. Dig it out and post it. Schematic
too if possible.

--Bob

Lee McLaren wrote:
{Quote hidden}

> {Original Message removed}

2004\07\09@215747 by Lee McLaren

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part 1 2018 bytes content-type:text/plain; (decoded 7bit)

Hi Bob and all,
The original project was and still is a commercial one but the file attached
is the meat of it, It would be hard to release more in the public domain
without jeopardising some ongoing projects but feel free to contact me
personally if you need more.

The basic idea is:
Pick a byte of data for a character ( I think from memory the font is Arial
for the test) and place it in the serial port to be clocked out, leaves you
time to get the next line of the next character, like I said it used some
tricks and I was well chuffed with myself at the time, I wrote this back in
early 1999 when I was first getting into PIC's.

From memory (1999 is a loooong time ago for me) the results on a hi def
video monitor where very good, you can change the number of characters
across a line by changing the serial clock divider.

Interested in feedback good or bad.

regards

Lee McLaren



{Original Message removed}
part 2 10695 bytes content-type:application/octet-stream; (decode)

2004\07\12@044623 by Alan B. Pearce

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> I am interested in overlaying text on a video source.  The STV5730A
> fits the bill perfectly.  The only problem is that it is discontinued.
> Does anyone know of a chip that can be interfaced to a PIC and overlay
> text on a video source like the STV5730A?  I haven't been successful
>finding one except for the BU5963AS.  Can't find anything on that one
>except a datasheet...no source for it though.  Thanks for any help.

Had a Maxim brochure across my desk late last week with some of these type
devices in it. Look at MAX4455 on the maxim web site.

For those dealing with video, see if they have the Analog Design Guide,
section 8, 22nd edition as a downloadable file. All sorts of chips in there
aimed at the digital camera, video recorder, set top box, home video market
in general.

http://www.maxim-ic.com/

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2004\07\12@070635 by Dave Wheeler

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Alan B. Pearce wrote:

{Quote hidden}

Had the same idea until I looked at the cost ($96 <25) and also the
device is only in 100 pin  TQFP
Great chip for the right application but considerable more and harder to
drive than the STV5730.
For those in the UK, CPC has stock of the 5730 at about #8

Dave

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2004\07\12@123138 by Bob Axtell

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But Alan, the part is a 100pin part, and is $47.50USD @1K. Unuseable.

--Bob

Alan B. Pearce wrote:
{Quote hidden}

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2004\07\12@124139 by David VanHorn

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I still have some of the ST chips, unused, plus the xtals for them.

Other than that, I'd suggest a copy of Don Lancaster's TV typewriter cookbook, and a Scenix or AVR processor :)  A tiny-11 has more usable bandwidth than my old 6502 based system that did video out. (OSI-C1P)
The character rom on the C1P would probably be it's only advantage.

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