<s>
Wideband	B-Algorithm
audio	I-Algorithm
,	O
also	O
known	O
as	O
wideband	B-Algorithm
voice	I-Algorithm
or	O
HD	B-Algorithm
voice	I-Algorithm
,	O
is	O
high	O
definition	O
voice	O
quality	O
for	O
telephony	O
audio	O
,	O
contrasted	O
with	O
standard	O
digital	O
telephony	O
"	O
toll	O
quality	O
"	O
.	O
</s>
<s>
Wideband	B-Algorithm
audio	I-Algorithm
relaxes	O
the	O
bandwidth	O
limitation	O
and	O
transmits	O
in	O
the	O
audio	O
frequency	O
range	O
of	O
50Hz	O
to	O
7kHz	O
.	O
</s>
<s>
In	O
addition	O
,	O
some	O
wideband	O
codecs	B-General_Concept
may	O
use	O
a	O
higher	O
audio	O
bit	O
depth	O
of	O
16	O
bits	O
to	O
encode	O
samples	O
,	O
also	O
resulting	O
in	O
much	O
better	O
voice	O
quality	O
.	O
</s>
<s>
Wideband	O
codecs	B-General_Concept
have	O
a	O
typical	O
sample	O
rate	O
of	O
16kHz	O
.	O
</s>
<s>
For	O
superwideband	O
codecs	B-General_Concept
the	O
typical	O
value	O
is	O
32kHz	O
.	O
</s>
<s>
In	O
1987	O
,	O
the	O
International	O
Telecommunication	O
Union	O
(	O
ITU	O
)	O
standardized	O
a	O
version	O
of	O
wideband	B-Algorithm
audio	I-Algorithm
known	O
as	O
G.722	B-Algorithm
.	O
</s>
<s>
Radio	O
broadcasters	O
began	O
using	O
G.722	B-Algorithm
over	O
Integrated	B-Protocol
Services	I-Protocol
Digital	I-Protocol
Network	I-Protocol
(	O
ISDN	B-Protocol
)	O
to	O
provide	O
high-quality	O
audio	O
for	O
remote	O
broadcasts	O
,	O
such	O
as	O
commentary	O
from	O
sports	O
venues	O
.	O
</s>
<s>
AMR-WB	B-Algorithm
(	O
G.722.2	B-Algorithm
)	O
was	O
developed	O
by	O
Nokia	O
and	O
VoiceAge	O
and	O
it	O
was	O
first	O
specified	O
by	O
3GPP	O
.	O
</s>
<s>
The	O
traditional	O
telephone	O
network	O
(	O
PSTN	O
)	O
is	O
generally	O
limited	O
to	O
narrowband	O
audio	O
by	O
the	O
intrinsic	O
nature	O
of	O
its	O
transmission	O
technology	O
,	O
TDM	O
(	O
time-division	B-Protocol
multiplexing	I-Protocol
)	O
,	O
and	O
by	O
the	O
analogue-to-digital	O
converters	O
used	O
at	O
the	O
edge	O
of	O
the	O
network	O
,	O
as	O
well	O
as	O
the	O
speakers	O
,	O
microphones	O
and	O
other	O
elements	O
in	O
the	O
endpoints	O
themselves	O
.	O
</s>
<s>
Wideband	B-Algorithm
audio	I-Algorithm
has	O
been	O
broadly	O
deployed	O
in	O
conjunction	O
with	O
videoconferencing	B-Application
.	O
</s>
<s>
Communications	O
via	O
Voice	B-Application
over	I-Application
Internet	I-Application
Protocol	I-Application
(	O
VoIP	B-Application
)	O
can	O
readily	O
employ	O
wideband	B-Algorithm
audio	I-Algorithm
.	O
</s>
<s>
When	O
PC-to-PC	O
calls	O
are	O
placed	O
via	O
VoIP	B-Application
services	O
,	O
such	O
as	O
Skype	B-Application
,	O
and	O
the	O
participants	O
use	O
a	O
high-quality	O
headset	O
,	O
the	O
resulting	O
call	O
quality	O
can	O
be	O
noticeably	O
superior	O
to	O
conventional	O
PSTN	O
calls	O
.	O
</s>
<s>
A	O
number	O
of	O
audio	B-Algorithm
codecs	I-Algorithm
have	O
emerged	O
to	O
support	O
these	O
services	O
,	O
supplementing	O
G.722	B-Algorithm
.	O
</s>
<s>
Manufacturers	O
of	O
audio	O
conferencing	O
equipment	O
have	O
introduced	O
wideband-capable	O
models	O
that	O
include	O
support	O
for	O
G.722	B-Algorithm
over	O
VoIP	B-Application
.	O
</s>
<s>
Conference	O
calls	O
are	O
a	O
direct	O
beneficiary	O
of	O
the	O
enhancements	O
offered	O
by	O
wideband	B-Algorithm
audio	I-Algorithm
.	O
</s>
<s>
Some	O
listener	O
benefits	O
cited	O
of	O
wideband	B-Algorithm
audio	I-Algorithm
compared	O
to	O
traditional	O
(	O
narrowband	O
)	O
:	O
</s>
<s>
Despite	O
its	O
reputation	O
for	O
poor	O
audio	O
quality	O
,	O
the	O
mobile	O
telephone	O
industry	O
has	O
started	O
to	O
make	O
some	O
progress	O
on	O
wideband	B-Algorithm
audio	I-Algorithm
.	O
</s>
<s>
The	O
3GPP	O
standards	O
group	O
has	O
designated	O
G.722.2	B-Algorithm
as	O
its	O
wideband	O
codec	B-General_Concept
and	O
calls	O
it	O
Adaptive	O
Multirate	O
–	O
Wideband	O
(	O
AMR-WB	B-Algorithm
)	O
.	O
</s>
<s>
More	O
than	O
a	O
hundred	O
handsets	O
have	O
been	O
introduced	O
supporting	O
this	O
codec	B-General_Concept
(	O
for	O
example	O
,	O
Apple	O
,	O
Google	B-Application
,	O
HTC	B-Application
,	O
Nokia	O
,	O
Samsung	B-Application
and	O
Sony	O
)	O
,	O
and	O
network	O
demonstrations	O
have	O
been	O
conducted	O
.	O
</s>
<s>
As	O
business	O
telephone	O
systems	O
have	O
adopted	O
VoIP	B-Application
technology	O
,	O
support	O
for	O
wideband	B-Algorithm
audio	I-Algorithm
has	O
grown	O
rapidly	O
.	O
</s>
<s>
Telephone	O
sets	O
from	O
Avaya	O
,	O
Cisco	O
,	O
NEC	O
Unified	O
Solutions	O
,	O
Grandstream	O
,	O
Gigaset	O
,	O
Panasonic	O
(	O
which	O
brands	O
wideband	B-Algorithm
audio	I-Algorithm
"	O
HD	O
Sonic	O
"	O
)	O
,	O
Polycom	O
(	O
which	O
brands	O
wideband	B-Algorithm
audio	I-Algorithm
"	O
HD	B-Algorithm
Voice	I-Algorithm
"	O
)	O
,	O
Snom	O
,	O
AudioCodes	O
(	O
which	O
brands	O
wideband	B-Algorithm
audio	I-Algorithm
"	O
HDVoIP	B-Algorithm
"	O
)	O
and	O
others	O
now	O
incorporate	O
G.722	B-Algorithm
,	O
as	O
well	O
as	O
varying	O
degrees	O
of	O
higher-quality	O
audio	O
components	O
.	O
</s>
<s>
Suppliers	O
of	O
integrated	O
circuits	O
for	O
telephony	O
equipment	O
,	O
including	O
DSP	O
Group	O
,	O
Broadcom	O
,	O
Infineon	O
,	O
and	O
Texas	O
Instruments	O
,	O
include	O
wideband	B-Algorithm
audio	I-Algorithm
in	O
their	O
feature	O
portfolios	O
.	O
</s>
<s>
There	O
are	O
audio	O
conferencing	O
service	O
providers	O
that	O
support	O
wideband	O
connections	O
from	O
these	O
and	O
other	O
VoIP	B-Application
endpoints	O
,	O
while	O
also	O
permitting	O
PSTN	O
participants	O
to	O
join	O
the	O
conference	O
in	O
narrowband	O
.	O
</s>
<s>
is	O
an	O
open-source	O
solution	O
for	O
VoIP	B-Application
media	O
processing	O
engine	O
supporting	O
wideband	O
and	O
HD	B-Algorithm
voice	I-Algorithm
that	O
provides	O
RTP	O
and	O
codecs	B-General_Concept
through	O
a	O
plugin	O
framework	O
for	O
use	O
with	O
SIP	O
and	O
other	O
VoIP	B-Application
protocols	O
.	O
</s>
<s>
Skype	B-Application
uses	O
an	O
audio	B-Algorithm
codec	I-Algorithm
called	O
Silk	B-Protocol
which	O
allows	O
for	O
extremely	O
high-quality	O
audio	O
.	O
</s>
<s>
A	O
number	O
of	O
carriers	O
around	O
the	O
world	O
have	O
rolled	O
out	O
HD	B-Algorithm
voice	I-Algorithm
services	O
based	O
on	O
the	O
G.722	B-Algorithm
wideband	O
standard	O
.	O
</s>
<s>
In	O
North	O
America	O
,	O
hosted	O
service	O
providers	O
have	O
recently	O
deployed	O
the	O
Aastra	O
Hi-Q	O
upgrade	O
to	O
its	O
installed	O
user	O
base	O
and	O
as	O
of	O
January	O
2010	O
claimed	O
around	O
70,000	O
HD	B-Algorithm
voice	I-Algorithm
endpoints	O
.	O
</s>
<s>
The	O
consumer	O
service	O
provider	O
ooma	O
has	O
an	O
estimated	O
25,000	O
HD	B-Algorithm
voice	I-Algorithm
endpoints	O
deployed	O
stemming	O
from	O
its	O
rollout	O
of	O
its	O
second-generation	O
Telo	O
hardware	O
.	O
</s>
<s>
In	O
cellular	O
communication	O
,	O
"	O
HD	B-Algorithm
Voice	I-Algorithm
"	O
specifically	O
refers	O
to	O
AMR-WB	B-Algorithm
(	O
G.722.2	B-Algorithm
)	O
in	O
VoLTE	O
,	O
but	O
AMR-WB	B-Algorithm
in	O
turn	O
does	O
not	O
specify	O
quality	O
or	O
bitrate	O
.	O
</s>
<s>
Likewise	O
for	O
HD	O
Voice+	O
and	O
AMR-WB	B-Algorithm
+	I-Algorithm
.	O
</s>
<s>
AMR-WB	B-Algorithm
is	O
natively	O
supported	O
in	O
Android	O
since	O
Android	B-Application
Gingerbread	I-Application
,	O
and	O
in	O
iOS	O
since	O
the	O
iPhone	B-Operating_System
5	I-Operating_System
.	O
</s>
<s>
As	O
of	O
December	O
2015	O
,	O
a	O
report	O
announces	O
117	O
commercial	O
mobile	O
HD	B-Algorithm
Voice	I-Algorithm
networks	O
launched	O
in	O
76	O
countries	O
.	O
</s>
<s>
Many	O
mobile	O
networks	O
including	O
AT&T	O
and	O
Verizon	O
are	O
discontinuing	O
support	O
for	O
phones	O
that	O
do	O
n't	O
support	O
4G	O
and	O
wideband	B-Algorithm
audio	I-Algorithm
.	O
</s>
<s>
The	O
following	O
are	O
wideband	B-Algorithm
audio	I-Algorithm
coding	O
standards	O
and	O
audio	B-Algorithm
codecs	I-Algorithm
used	O
in	O
telecommunication	O
.	O
</s>
