<s>
The	O
Sandin	B-General_Concept
Image	I-General_Concept
Processor	I-General_Concept
is	O
a	O
video	O
synthesizer	O
,	O
usually	O
introduced	O
as	O
invented	O
by	O
Dan	O
Sandin	O
and	O
designed	O
between	O
1971	O
and	O
1974	O
.	O
</s>
<s>
An	O
analog	O
,	O
Modular	B-Architecture
Synthesizer	I-Architecture
,	O
real	O
time	O
,	O
video	O
processing	O
instrument	O
,	O
it	O
provided	O
video	O
processing	O
performance	O
and	O
produced	O
subtle	O
and	O
delicate	O
video	O
effects	O
of	O
a	O
complexity	O
not	O
seen	O
again	O
until	O
well	O
into	O
the	O
digital	O
video	O
revolution	O
.	O
</s>
<s>
Its	O
real	O
time	O
nature	O
led	O
to	O
its	O
use	O
in	O
live	O
theater	O
performance	O
,	O
including	O
"	O
Electronic	O
Visualization	O
Events	O
"	O
where	O
it	O
was	O
seen	O
processing	O
the	O
output	O
of	O
Tom	O
DeFanti	O
's	O
Graphics	B-Language
Symbiosis	I-Language
System	I-Language
.	O
</s>
<s>
The	O
Sandin	B-General_Concept
Image	I-General_Concept
Processor	I-General_Concept
fostered	O
many	O
imaginative	O
videotapes	O
seen	O
,	O
for	O
example	O
at	O
early	O
SIGGRAPH	O
conferences	O
.	O
</s>
<s>
Physically	O
,	O
an	O
Image	O
Processor	O
system	O
would	O
be	O
built	O
out	O
of	O
modules	B-Architecture
.	O
</s>
<s>
Several	O
types	O
of	O
modules	B-Architecture
were	O
defined	O
and	O
typically	O
would	O
be	O
an	O
aluminum	O
box	O
containing	O
a	O
circuit	O
board	O
inside	O
,	O
video	O
connectors	O
and	O
knobs	O
on	O
front	O
of	O
box	O
and	O
power	O
connector	O
on	O
back	O
of	O
box	O
.	O
</s>
<s>
The	O
modules	B-Architecture
would	O
be	O
organized	O
in	O
rows	O
.	O
</s>
<s>
Individual	O
systems	O
could	O
vary	O
in	O
size	O
and	O
increase	O
in	O
power	O
with	O
the	O
addition	O
of	O
more	O
modules	B-Architecture
.	O
</s>
<s>
Typical	O
modules	B-Architecture
would	O
be	O
signal	O
sources	O
,	O
combiners	O
and	O
modifiers	O
,	O
effects	O
modules	B-Architecture
,	O
sync	O
,	O
color	O
encoder	O
,	O
color	O
decoder	O
,	O
and	O
NTSC	O
video	O
interface	O
.	O
</s>
<s>
A	O
following	O
of	O
video	O
artists	O
,	O
students	O
,	O
and	O
others	O
interested	O
in	O
video	O
electronics	O
would	O
assemble	O
these	O
modules	B-Architecture
kit	O
style	O
and	O
try	O
to	O
build	O
up	O
their	O
synthesizers	O
.	O
</s>
<s>
From	O
time	O
to	O
time	O
Sandin	O
and	O
staff	O
would	O
hold	O
fix-it	O
parties	O
where	O
modules	B-Architecture
that	O
failed	O
to	O
come	O
up	O
for	O
non-electronics	O
oriented	O
artists	O
would	O
be	O
repaired	O
by	O
the	O
senior	O
staff	O
.	O
</s>
<s>
Other	O
analog	O
video	O
instruments	O
from	O
the	O
same	O
era	O
include	O
the	O
Paik-Abe	O
video	O
synthesizer	O
,	O
the	O
Rutt/Etra	B-Algorithm
Video	I-Algorithm
Synthesizer	I-Algorithm
(	O
by	O
Steve	O
Rutt	O
and	O
Bill	O
Etra	O
)	O
,	O
and	O
the	O
work	O
of	O
Steina	O
and	O
Woody	O
Vasulka	O
with	O
Jeff	O
Schier	O
and	O
Diana	O
Dosch	O
.	O
</s>
