<s>
In	O
telecommunication	O
,	O
data	B-General_Concept
compaction	I-General_Concept
is	O
the	O
reduction	O
of	O
the	O
number	O
of	O
data	O
elements	O
,	O
bandwidth	O
,	O
cost	O
,	O
and	O
time	O
for	O
the	O
generation	O
,	O
transmission	O
,	O
and	O
storage	B-General_Concept
of	I-General_Concept
data	I-General_Concept
without	O
loss	O
of	O
information	O
by	O
eliminating	O
unnecessary	O
redundancy	B-General_Concept
,	O
removing	O
irrelevancy	O
,	O
or	O
using	O
special	O
coding	O
.	O
</s>
<s>
Examples	O
of	O
data	B-General_Concept
compaction	I-General_Concept
methods	O
are	O
the	O
use	O
of	O
fixed-tolerance	O
bands	O
,	O
variable-tolerance	O
bands	O
,	O
slope-keypoints	O
,	O
sample	O
changes	O
,	O
curve	O
patterns	O
,	O
curve	B-Algorithm
fitting	I-Algorithm
,	O
variable-precision	O
coding	O
,	O
frequency	O
analysis	O
,	O
and	O
probability	O
analysis	O
.	O
</s>
<s>
Simply	O
squeezing	O
noncompacted	O
data	O
into	O
a	O
smaller	O
space	O
,	O
for	O
example	O
by	O
increasing	O
packing	O
density	O
by	O
transferring	O
images	O
from	O
newsprint	O
to	O
microfilm	O
or	O
by	O
transferring	O
data	O
on	O
punched	B-Architecture
cards	I-Architecture
onto	O
magnetic	O
tape	O
,	O
is	O
not	O
data	B-General_Concept
compaction	I-General_Concept
.	O
</s>
<s>
The	O
number	O
of	O
bits	O
required	O
to	O
transmit	O
and	O
store	O
"	O
WYSIWYG	B-Application
"	O
(	O
What	B-Application
You	I-Application
See	I-Application
Is	I-Application
What	I-Application
You	I-Application
Get	I-Application
)	O
is	O
reduced	O
from	O
its	O
expanded	O
equivalent	O
(	O
7	O
characters	O
vs	O
28	O
)	O
.	O
</s>
