<s>
The	O
four-tube	B-Algorithm
television	I-Algorithm
camera	I-Algorithm
,	O
intended	O
for	O
color	O
television	O
studio	O
use	O
,	O
was	O
first	O
developed	O
by	O
RCA	O
in	O
the	O
early	O
1960s	O
.	O
</s>
<s>
As	O
the	O
composite	O
signals	O
in	O
NTSC	O
,	O
PAL	B-Language
and	O
SECAM	O
systems	O
all	O
used	O
band-limited	O
colour	O
information	O
,	O
so	O
the	O
colour	O
channels	O
in	O
a	O
4-tube	O
camera	O
could	O
be	O
band-limited	O
,	O
appropriately	O
.	O
</s>
<s>
There	O
are	O
three	O
components	O
in	O
the	O
composite	O
waveforms	O
for	O
the	O
NTSC	O
,	O
PAL	B-Language
and	O
SECAM	O
broadcast	O
television	O
systems	O
a	O
wideband	O
luminance	O
signal	O
(	O
Y	O
)	O
and	O
two	O
narrow	O
band	O
colour-difference	O
signals	O
,	O
containing	O
(	O
R	O
–	O
Y	O
)	O
and	O
(	O
B	O
–	O
Y	O
)	O
.	O
</s>
