sending video to multiple monitors and other tricks

[max slomoff]

hi,
i found out that with a video splitter and maybe a signal amplifier i
can send the same video signal to multiple monitors.

i also found out that every tv monitor has a 75 ohm impedance switch
which is usually on. if you can de activate this switch, you can send
the video on from that monitor to the next in a link instead of
needing a splitter.

question one is - how easy is it to find and disable that 75 ohm
switch in a regular consumer monitor? i just bought an old sony "cube"
design monitor and it has a switch on the back pannel, and an output
so you can send the video signal on. how would you disable this in a
consumer monitor?

question two is - what is the hardware called that would take a video
signal, split it into quarters or 9ths and then send each piece to
another monitor, so if i wanted i could stack the monitors and have
one huge image?

question three is - what other kinds of tricks are out there for
manipulating video images with hardware thats easily accessable? i was
wondering if there's any way to delay a video signal. If i split the
same signal to four different monitors, could i delay one of them so
it plays a little behind the rest?

thanks a lot for the information.
max

 

[Peter Bennett]

On 27 Sep 2003 17:46:35 -0700, maxslomoff@aol.com (max slomoff) wrote:

hi,
i found out that with a video splitter and maybe a signal amplifier i
can send the same video signal to multiple monitors.

i also found out that every tv monitor has a 75 ohm impedance switch
which is usually on. if you can de activate this switch, you can send
the video on from that monitor to the next in a link instead of
needing a splitter.

question one is - how easy is it to find and disable that 75 ohm
switch in a regular consumer monitor? i just bought an old sony "cube"
design monitor and it has a switch on the back pannel, and an output
so you can send the video signal on. how would you disable this in a
consumer monitor?

On monitors I've dealt with (most were for use in a TV Broadcast
studio), there were two video connectors on the read panel, with the
75 ohm termination switch nearby, and easily accessible without
removing any covers.

question two is - what is the hardware called that would take a video
signal, split it into quarters or 9ths and then send each piece to
another monitor, so if i wanted i could stack the monitors and have
one huge image?

video distribution amplifier

question three is - what other kinds of tricks are out there for
manipulating video images with hardware thats easily accessable? i was
wondering if there's any way to delay a video signal. If i split the
same signal to four different monitors, could i delay one of them so
it plays a little behind the rest?

You can delay by nanoseconds by using coax cable (about 1.5 nS per
foot). For any noticeable delay, you need serious electronics, or
perhaps videotape. (at one station, we did a video delay using two 2"
broadcast video recorders side-by-side - record on one, and play back
on the other (with the tape carefully draped between the machines)).


--
Peter Bennett, VE7CEI
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

 

[Tomi Holger Engdahl]

maxslomoff@aol.com (max slomoff) writes:

hi,
i found out that with a video splitter and maybe a signal amplifier i
can send the same video signal to multiple monitors.

Yes.

i also found out that every tv monitor has a 75 ohm impedance switch
which is usually on. if you can de activate this switch, you can send
the video on from that monitor to the next in a link instead of
needing a splitter.

Yes.

question one is - how easy is it to find and disable that 75 ohm
switch in a regular consumer monitor?

There is no 75 ohm switch on a regular consumer monitor.
There is auite often 75 ohm termination resistor somewhere
in the monitor that does this 75 ohm termination.
By removing that resistor could make such device "high impedance"
so you can daisy-chain many of those to same cable.

i just bought an old sony "cube"
design monitor and it has a switch on the back pannel, and an output
so you can send the video signal on. how would you disable this in a
consumer monitor?

This usually involves getting the schematic, then figuring out
where that resistor is and then removing it. And then possibly
chanign the connections so that there is input and output
connectors for diasy-chaining.

question two is - what is the hardware called that would take a video
signal, split it into quarters or 9ths and then send each piece to
another monitor, so if i wanted i could stack the monitors and have
one huge image?

I think that those are called video wall processor.

question three is - what other kinds of tricks are out there for
manipulating video images with hardware thats easily accessable?

With a powerful PC, a video capture card, graphics card
with video out you can do quite many tricks with suitable
software.

i was wondering if there's any way to delay a video signal.

How much do you want to delay it ?

For very short delays, a long coaxial cable will do.
For longer delays you propably need some active electronics
like timebase corrector, framestore etc.

If i split the
same signal to four different monitors, could i delay one of them so
it plays a little behind the rest?

What is the point of doing this ?


--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/

 

[max slomoff]

the point of doing all this is simply to set up a dynamic multi
monitor display.

you mentioned software and a computer? can you give me some names of
software that do real time fx?
would i feed the video to the computer and run it out? or would i have
the video on a computer and run it all out from there to different
monitors?

 

[Watson A.Name - "Watt Sun]

In article <lajekxxs3o7.fsf@solarflare.cs.hut.fi>,
then@solarflare.cs.hut.fi mentioned...

maxslomoff@aol.com (max slomoff) writes:
[snip]

question two is - what is the hardware called that would take a video
signal, split it into quarters or 9ths and then send each piece to
another monitor, so if i wanted i could stack the monitors and have
one huge image?

I think that those are called video wall processor.

Go here and find out all about them. They're awesome!
http://www.9xmedia.com


[snip]

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