<s>
Silence	B-General_Concept
compression	I-General_Concept
provides	O
a	O
way	O
to	O
squeeze	O
redundancy	B-Application
out	O
of	O
sound	O
files	O
.	O
</s>
<s>
The	O
silence	B-General_Concept
compression	I-General_Concept
scheme	O
is	O
essential	O
for	O
efficient	O
voice	O
communication	O
systems	O
.	O
</s>
<s>
A	O
silence	B-General_Concept
compression	I-General_Concept
scheme	O
include	O
a	O
voice	B-General_Concept
activity	I-General_Concept
detection	I-General_Concept
(	O
VAD	O
)	O
,	O
a	O
silence	O
insertion	O
descriptor	O
(	O
SID	O
)	O
and	O
a	O
comfort	O
noise	O
generator	O
(	O
CNG	O
)	O
module	O
.	O
</s>
