<s>
G.718	B-Algorithm
is	O
an	O
ITU-T	O
Recommendation	O
embedded	O
scalable	B-Architecture
speech	O
and	O
audio	B-Algorithm
codec	I-Algorithm
providing	O
high	O
quality	O
narrowband	O
(	O
250Hz	O
to	O
3.5kHz	O
)	O
speech	O
over	O
the	O
lower	O
bit	O
rates	O
and	O
high	O
quality	O
wideband	O
(	O
50Hz	O
to	O
7kHz	O
)	O
speech	O
over	O
the	O
complete	O
range	O
of	O
bit	O
rates	O
.	O
</s>
<s>
In	O
addition	O
,	O
G.718	B-Algorithm
is	O
designed	O
to	O
be	O
highly	O
robust	O
to	O
frame	O
erasures	O
,	O
thereby	O
enhancing	O
the	O
speech	O
quality	O
when	O
used	O
in	O
Internet	B-Protocol
Protocol	I-Protocol
(	O
IP	O
)	O
transport	O
applications	O
on	O
fixed	O
,	O
wireless	O
and	O
mobile	O
networks	O
.	O
</s>
<s>
The	O
codec	O
has	O
an	O
embedded	O
scalable	B-Architecture
structure	O
,	O
enabling	O
maximum	O
flexibility	O
in	O
the	O
transport	O
of	O
voice	O
packets	O
through	O
IP	O
networks	O
of	O
today	O
and	O
in	O
future	O
media-aware	O
networks	O
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
embedded	O
structure	O
of	O
G.718	B-Algorithm
will	O
easily	O
allow	O
the	O
codec	O
to	O
be	O
extended	O
to	O
provide	O
a	O
superwideband	O
(	O
50Hz	O
to	O
14kHz	O
)	O
and	O
stereo	O
capability	O
through	O
additional	O
layers	O
which	O
are	O
currently	O
under	O
development	O
in	O
ITU-T	O
Study	O
Group	O
16	O
.	O
</s>
<s>
The	O
G.718	B-Algorithm
encoder	O
can	O
accept	O
wideband	O
sampled	O
signals	O
at	O
16kHz	O
,	O
or	O
narrowband	O
signals	O
sampled	O
at	O
either	O
16	O
or	O
8kHz	O
.	O
</s>
<s>
The	O
output	O
of	O
the	O
G.718	B-Algorithm
codec	O
is	O
capable	O
of	O
operating	O
with	O
a	O
bandwidth	O
of	O
50Hz	O
to	O
4kHz	O
at	O
8	O
and	O
12	O
kbit/s	O
and	O
50Hz	O
to	O
7kHz	O
from	O
8	O
to	O
32	O
kbit/s	O
.	O
</s>
<s>
The	O
codec	O
core	O
represented	O
a	O
significant	O
advance	O
in	O
quality	O
over	O
other	O
available	O
codecs	O
,	O
providing	O
8	O
kbit/s	O
wideband	O
clean	O
speech	O
quality	O
equivalent	O
to	O
G.722.2	B-Algorithm
at	O
12.65	O
kbit/s	O
whilst	O
the	O
8	O
kbit/s	O
narrowband	O
codec	O
operating	O
mode	O
provides	O
clean	O
speech	O
quality	O
equivalent	O
to	O
G.729	B-Algorithm
Annex	O
E	O
at	O
11.8	O
kbit/s	O
.	O
</s>
<s>
The	O
codec	O
also	O
incorporates	O
an	O
alternate	O
coding	O
mode	O
,	O
with	O
a	O
minimum	O
bit	O
rate	O
of	O
12.65	O
kbit/s	O
,	O
which	O
is	O
bitstream	O
interoperable	O
with	O
ITU-T	O
Recommendation	O
G.722.2	B-Algorithm
,	O
3GPP	O
AMR-WB	B-Algorithm
and	O
3GPP2	O
VMR-WB	B-Algorithm
mobile	O
wideband	O
speech	O
coding	O
standards	O
.	O
</s>
<s>
The	O
decoder	O
is	O
further	O
able	O
to	O
decode	O
all	O
other	O
G.722.2	B-Algorithm
operating	O
modes	O
.	O
</s>
<s>
G.718	B-Algorithm
also	O
includes	O
discontinuous	O
transmission	O
mode	O
(	O
DTX	O
)	O
and	O
comfort	O
noise	O
generation	O
(	O
CNG	O
)	O
algorithms	O
that	O
enable	O
bandwidth	O
savings	O
during	O
inactive	O
periods	O
.	O
</s>
<s>
The	O
underlying	O
algorithm	O
is	O
based	O
on	O
a	O
two-stage	O
coding	O
structure	O
:	O
the	O
lower	O
two	O
layers	O
are	O
based	O
on	O
Code-Excited	B-Algorithm
Linear	I-Algorithm
Prediction	I-Algorithm
(	O
CELP	B-Algorithm
)	O
coding	O
of	O
the	O
band	O
(	O
50	O
–	O
6400Hz	O
)	O
where	O
the	O
core	O
layer	O
takes	O
advantage	O
of	O
signal-classification	O
to	O
use	O
optimized	O
coding	O
modes	O
for	O
each	O
frame	O
.	O
</s>
<s>
G.718	B-Algorithm
was	O
developed	O
in	O
ITU-T	O
Study	O
Group	O
16	O
as	O
part	O
of	O
an	O
open	O
consortium	O
of	O
9	O
organizations	O
;	O
Motorola	O
,	O
Nokia	O
,	O
Ericsson	O
,	O
Texas	O
Instruments	O
,	O
,	O
Panasonic	O
,	O
Huawei	O
,	O
France	O
Telecom	O
,	O
Qualcomm	O
.	O
</s>
<s>
G.718	B-Algorithm
is	O
officially	O
described	O
as	O
Frame	O
error	O
robust	O
narrowband	O
and	O
wideband	O
embedded	O
variable	O
bit-rate	O
coding	O
of	O
speech	O
and	O
audio	O
from	O
8-32	O
kbit/s	O
.	O
</s>
