<s>
In	O
the	O
compact	O
disc	O
system	O
,	O
cross-interleaved	O
Reed	B-Error_Name
–	I-Error_Name
Solomon	I-Error_Name
code	I-Error_Name
(	O
CIRC	O
)	O
provides	O
error	B-Error_Name
detection	I-Error_Name
and	O
error	B-Error_Name
correction	I-Error_Name
.	O
</s>
<s>
CIRC	O
adds	O
to	O
every	O
three	O
data	O
bytes	B-Application
one	O
redundant	B-General_Concept
parity	B-Error_Name
byte	B-Application
.	O
</s>
<s>
Reed	B-Error_Name
–	I-Error_Name
Solomon	I-Error_Name
codes	I-Error_Name
are	O
specifically	O
useful	O
in	O
combating	O
mixtures	O
of	O
random	O
and	O
burst	O
errors	O
.	O
</s>
<s>
In	O
order	O
to	O
alleviate	O
the	O
strain	O
on	O
the	O
error	B-Error_Name
control	I-Error_Name
code	O
,	O
some	O
form	O
of	O
interleaving	O
is	O
required	O
.	O
</s>
<s>
The	O
CD	O
system	O
employs	O
two	O
concatenated	O
Reed	B-Error_Name
–	I-Error_Name
Solomon	I-Error_Name
codes	I-Error_Name
,	O
which	O
are	O
interleaved	O
cross-wise	O
.	O
</s>
<s>
Judicious	O
positioning	O
of	O
the	O
stereo	O
channels	O
as	O
well	O
as	O
the	O
audio	O
samples	O
on	O
even	O
or	O
odd-number	O
instants	O
within	O
the	O
interleaving	O
scheme	O
provide	O
the	O
error	O
concealment	O
ability	O
,	O
and	O
the	O
multitude	O
of	O
interleave	O
structures	O
used	O
on	O
the	O
CD	O
makes	O
it	O
possible	O
to	O
correct	O
and	O
detect	O
errors	O
with	O
a	O
relatively	O
low	O
amount	O
of	O
redundancy	B-General_Concept
.	O
</s>
