<s>
Enhanced	B-Algorithm
Variable	I-Algorithm
Rate	I-Algorithm
CODEC	I-Algorithm
(	O
EVRC	B-Algorithm
)	O
is	O
a	O
speech	B-Application
codec	I-Application
used	O
in	O
CDMA	B-Protocol
networks	O
.	O
</s>
<s>
It	O
was	O
developed	O
in	O
1995	O
to	O
replace	O
the	O
QCELP	B-Algorithm
vocoder	O
which	O
used	O
more	O
bandwidth	O
on	O
the	O
carrier	O
's	O
network	O
,	O
thus	O
EVRC	B-Algorithm
's	O
primary	O
goal	O
was	O
to	O
offer	O
the	O
mobile	O
carriers	O
more	O
capacity	O
on	O
their	O
networks	O
while	O
not	O
increasing	O
the	O
amount	O
of	O
bandwidth	O
or	O
wireless	O
spectrum	O
needed	O
.	O
</s>
<s>
EVRC	B-Algorithm
uses	O
RCELP	B-Algorithm
technology	O
.	O
</s>
<s>
EVRC	B-Algorithm
compresses	O
each	O
20	O
milliseconds	O
of	O
8000Hz	O
,	O
16-bit	O
sampled	O
speech	O
input	O
into	O
output	O
frames	O
of	O
one	O
of	O
three	O
different	O
sizes	O
:	O
full	O
rate	O
–	O
171	O
bits	O
(	O
8.55	O
kbit/s	O
)	O
,	O
half	O
rate	O
–	O
80	O
bits	O
(	O
4.0	O
kbit/s	O
)	O
,	O
eighth	O
rate	O
–	O
16	O
bits	O
(	O
0.8	O
kbit/s	O
)	O
.	O
</s>
<s>
A	O
quarter	O
rate	O
was	O
not	O
included	O
in	O
the	O
original	O
EVRC	B-Algorithm
specification	O
and	O
eventually	O
became	O
part	O
of	O
EVRC-B	B-Algorithm
.	O
</s>
<s>
EVRC	B-Algorithm
was	O
replaced	O
by	O
SMV	O
.	O
</s>
<s>
4GV	O
is	O
the	O
next	O
generation	O
3GPP2	O
standards-based	O
EVRC-B	B-Algorithm
codec	O
.	O
</s>
<s>
EVRC	B-Algorithm
can	O
be	O
also	O
used	O
in	O
3GPP2	O
container	O
file	O
format	O
-	O
3G2	O
.	O
</s>
