<s>
G.729.1	B-Algorithm
is	O
an	O
8-32	O
kbit/s	O
embedded	B-Architecture
speech	O
and	O
audio	O
codec	B-General_Concept
providing	O
bitstream	O
interoperability	O
with	O
G.729	B-Algorithm
,	O
G.729	B-Algorithm
Annex	O
A	O
and	O
G.729	B-Algorithm
Annex	O
B	O
.	O
</s>
<s>
Its	O
official	O
name	O
is	O
G.729-based	O
embedded	B-Architecture
variable	O
bit	O
rate	O
codec	B-General_Concept
:	O
An	O
8-32	O
kbit/s	O
scalable	O
wideband	O
coder	O
bitstream	O
interoperable	O
with	O
G.729	B-Algorithm
.	O
</s>
<s>
This	O
codec	B-General_Concept
has	O
been	O
designed	O
to	O
provide	O
better	O
quality	O
and	O
more	O
flexibility	O
than	O
the	O
existing	O
ITU-T	O
G.729	B-Algorithm
speech	O
coding	O
standard	O
.	O
</s>
<s>
G.729.1	B-Algorithm
is	O
scalable	O
in	O
bit	O
rate	O
,	O
acoustic	O
bandwidth	B-Algorithm
and	O
complexity	O
.	O
</s>
<s>
The	O
bitstream	O
of	O
G.729.1	B-Algorithm
is	O
structured	O
into	O
12	O
hierarchical	O
layers	O
.	O
</s>
<s>
The	O
first	O
layer	O
(	O
or	O
core	O
layer	O
)	O
at	O
8	O
kbit/s	O
follows	O
the	O
G.729	B-Algorithm
format	O
.	O
</s>
<s>
The	O
third	O
layer	O
(	O
2	O
kbit/s	O
for	O
a	O
total	O
of	O
14	O
kbit/s	O
)	O
is	O
a	O
bandwidth	B-Algorithm
extension	O
layer	O
.	O
</s>
<s>
G.729.1	B-Algorithm
is	O
also	O
known	O
as	O
G.729	B-Algorithm
Annex	O
J	O
and	O
G.729EV	O
where	O
EV	O
stands	O
for	O
Embedded	B-Architecture
Variable	O
(	O
bit	O
rate	O
)	O
.	O
</s>
<s>
The	O
G.729.1	B-Algorithm
algorithm	O
is	O
based	O
on	O
a	O
three-stage	O
coding	O
structure	O
:	O
embedded	B-Architecture
code-excited	B-Algorithm
linear	I-Algorithm
prediction	I-Algorithm
(	O
CELP	B-Algorithm
)	O
coding	O
of	O
the	O
lower	O
band	O
(	O
50	O
–	O
4000Hz	O
)	O
,	O
parametric	O
coding	O
of	O
the	O
higher	O
band	O
(	O
4000	O
–	O
7000Hz	O
)	O
by	O
Time-Domain	O
Bandwidth	B-Algorithm
Extension	O
(	O
TDBWE	O
)	O
,	O
and	O
enhancement	O
of	O
the	O
full	O
band	O
(	O
50	O
–	O
7000Hz	O
)	O
by	O
a	O
predictive	O
transform	B-Algorithm
coding	I-Algorithm
technique	O
referred	O
to	O
as	O
time-domain	O
aliasing	O
cancellation	O
(	O
TDAC	O
)	O
or	O
modified	O
discrete	O
cosine	O
transform	O
(	O
MDCT	O
)	O
coding	O
.	O
</s>
<s>
As	O
of	O
January	O
1	O
,	O
2017	O
,	O
the	O
patent	O
terms	O
of	O
most	O
licensed	O
patents	O
under	O
the	O
G.729	B-Algorithm
Consortium	O
have	O
expired	O
,	O
the	O
remaining	O
unexpired	O
patents	O
are	O
usable	O
on	O
a	O
royalty-free	O
basis	O
.	O
</s>
