<s>
G.722.1	B-Algorithm
is	O
a	O
licensed	O
royalty-free	O
ITU-T	O
standard	O
audio	B-Algorithm
codec	I-Algorithm
providing	O
high	O
quality	O
,	O
moderate	O
bit	O
rate	O
(	O
24	O
and	O
32	O
kbit/s	O
)	O
wideband	B-Algorithm
(	O
50Hz	O
–	O
7kHz	O
audio	O
bandwidth	O
,	O
16	O
ksps	O
(	O
kilo-samples	O
per	O
second	O
)	O
audio	O
coding	O
.	O
</s>
<s>
It	O
is	O
a	O
partial	O
implementation	O
of	O
Siren	B-Algorithm
7	I-Algorithm
audio	O
coding	O
format	O
(	O
which	O
offers	O
bit	O
rates	O
16	O
,	O
24	O
,	O
32	O
kbit/s	O
)	O
developed	O
by	O
PictureTel	O
Corp	O
.	O
(	O
now	O
Polycom	O
,	O
Inc	O
.	O
)	O
.	O
</s>
<s>
G.722.1	B-Algorithm
Annex	O
C	O
(	O
or	O
G.722.1C	O
)	O
is	O
a	O
low-complexity	O
extension	O
mode	O
to	O
G.722.1	B-Algorithm
,	O
which	O
doubles	O
the	O
algorithm	O
to	O
permit	O
14kHz	O
audio	O
bandwidth	O
using	O
a	O
32kHz	O
audio	O
sample	O
rate	O
,	O
at	O
24	O
,	O
32	O
,	O
and	O
48kbit/s	O
.	O
</s>
<s>
It	O
is	O
included	O
in	O
the	O
official	O
ITU-T	O
Recommendation	O
G.722.1	B-Algorithm
.	O
</s>
<s>
It	O
is	O
an	O
implementation	O
of	O
the	O
mono	O
version	O
of	O
Polycom	O
's	O
Siren	B-Algorithm
14	I-Algorithm
audio	O
coding	O
format	O
.	O
</s>
<s>
G.722.1	B-Algorithm
is	O
the	O
successor	O
to	O
PT716plus	O
developed	O
by	O
PictureTel	O
Corp	O
.	O
(	O
now	O
Polycom	O
,	O
Inc	O
.	O
)	O
,	O
which	O
has	O
been	O
used	O
in	O
videoconferencing	O
systems	O
for	O
many	O
years	O
.	O
</s>
<s>
As	O
ITU-T	O
Recommendation	O
G.722.1	B-Algorithm
,	O
it	O
was	O
approved	O
on	O
September	O
30	O
,	O
1999	O
after	O
a	O
four-year	O
selection	O
process	O
involving	O
extensive	O
testing	O
.	O
</s>
<s>
G.722.1/Annex	O
C	O
was	O
approved	O
by	O
ITU-T	O
on	O
May	O
14	O
,	O
2005	O
.	O
</s>
<s>
G.722.1	B-Algorithm
is	O
a	O
transform-based	O
compressor	O
that	O
is	O
optimized	O
for	O
both	O
speech	O
and	O
music	O
.	O
</s>
<s>
The	O
G.722.1	B-Algorithm
algorithm	O
is	O
based	O
on	O
lapped	O
transform	O
technology	O
,	O
using	O
a	O
Modulated	O
Lapped	O
Transform	O
(	O
MLT	O
)	O
,	O
a	O
type	O
of	O
MDCT	O
.	O
</s>
<s>
The	O
numbering	O
of	O
the	O
wideband	B-Algorithm
ITU	O
audio	B-Algorithm
codecs	I-Algorithm
is	O
sometimes	O
confusing	O
.	O
</s>
<s>
There	O
are	O
three	O
principal	O
codecs	O
,	O
which	O
are	O
unrelated	O
,	O
but	O
all	O
carrying	O
the	O
G.722	B-Algorithm
label	O
.	O
</s>
<s>
G.722	B-Algorithm
is	O
the	O
original	O
7kHz	O
codec	O
,	O
using	O
ADPCM	B-Algorithm
and	O
operating	O
at	O
48	O
–	O
64kbit/s	O
.	O
</s>
<s>
G.722.1	B-Algorithm
,	O
another	O
7kHz	O
codec	O
,	O
operates	O
at	O
half	O
the	O
data	O
rate	O
while	O
delivering	O
comparable	O
or	O
better	O
quality	O
than	O
G.722	B-Algorithm
,	O
but	O
is	O
a	O
transform-based	O
codec	O
.	O
</s>
<s>
G.722.1	B-Algorithm
Annex	O
C	O
is	O
very	O
similar	O
to	O
G.722.1	B-Algorithm
,	O
but	O
provides	O
twice	O
the	O
audio	O
bandwidth	O
,	O
14kHz	O
.	O
</s>
<s>
And	O
G.722.2	B-Algorithm
,	O
which	O
operates	O
on	O
wideband	B-Algorithm
speech	O
and	O
delivers	O
very	O
low	O
bitrates	O
,	O
is	O
an	O
ACELP-based	O
algorithm	O
.	O
</s>
<s>
G.722.1	B-Algorithm
is	O
available	O
under	O
a	O
royalty-free	O
license	O
by	O
Polycom	O
Corporation	O
,	O
who	O
owns	O
all	O
rights	O
.	O
</s>
<s>
Licensees	O
also	O
receive	O
the	O
right	O
to	O
use	O
Polycom	O
's	O
16kbit/s	O
decoder	O
extension	O
of	O
G.722.1	B-Algorithm
,	O
as	O
well	O
as	O
G.722.1	B-Algorithm
Annex	O
C	O
,	O
and	O
Polycom	O
's	O
IP	O
within	O
the	O
new	O
20kHz	O
ITU	O
fullband	O
codec	O
,	O
G.719	O
.	O
</s>
