<s>
SBC	B-General_Concept
,	O
or	O
low-complexity	O
subband	B-Algorithm
codec	I-Algorithm
,	O
is	O
an	O
audio	O
subband	B-Algorithm
codec	I-Algorithm
specified	O
by	O
the	O
Bluetooth	O
Special	O
Interest	O
Group	O
(	O
SIG	O
)	O
for	O
the	O
Advanced	O
Audio	O
Distribution	O
Profile	O
(	O
A2DP	O
)	O
.	O
</s>
<s>
SBC	B-General_Concept
is	O
a	O
digital	O
audio	B-Algorithm
encoder	I-Algorithm
and	O
decoder	O
used	O
to	O
transfer	O
data	O
to	O
Bluetooth	B-General_Concept
audio	I-General_Concept
output	O
devices	O
like	O
headphones	O
or	O
loudspeakers	O
.	O
</s>
<s>
As	O
of	O
A2DP	O
version	O
1.3	O
,	O
the	O
Low	B-General_Concept
Complexity	I-General_Concept
Subband	I-General_Concept
Coding	I-General_Concept
remains	O
the	O
default	O
codec	O
and	O
its	O
implementation	O
is	O
mandatory	O
for	O
devices	O
supporting	O
that	O
profile	O
,	O
but	O
vendors	O
are	O
free	O
to	O
add	O
their	O
own	O
codecs	O
to	O
match	O
their	O
needs	O
.	O
</s>
<s>
At	O
CES	O
2020	O
the	O
Bluetooth	O
SIG	O
announced	O
LC3	B-General_Concept
as	O
the	O
successor	O
of	O
SBC	B-General_Concept
.	O
</s>
<s>
LC3	B-General_Concept
is	O
used	O
in	O
the	O
LE	O
Audio	O
protocol	O
based	O
on	O
the	O
Bluetooth	O
5.2	O
Core	O
Specification	O
.	O
</s>
<s>
SBC	B-General_Concept
supports	O
mono	O
and	O
stereo	O
streams	O
,	O
and	O
certain	O
sampling	B-Algorithm
frequencies	I-Algorithm
up	O
to	O
48kHz	O
.	O
</s>
<s>
It	O
uses	O
4	O
or	O
8	O
subbands	B-Algorithm
,	O
an	O
adaptive	O
bit	O
allocation	O
algorithm	O
in	O
combination	O
with	O
an	O
adaptive	O
block	O
PCM	O
quantizer	O
.	O
</s>
<s>
Frans	O
de	O
Bont	O
has	O
based	O
the	O
SBC	B-General_Concept
audio	B-Algorithm
codec	I-Algorithm
on	O
his	O
earlier	O
work	O
,	O
and	O
–	O
in	O
parts	O
–	O
on	O
the	O
MPEG-1	O
Audio	O
Layer	O
II	O
standard	O
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
SBC	B-General_Concept
is	O
based	O
on	O
the	O
algorithms	O
described	O
in	O
the	O
EP-0400755B1	O
.	O
</s>
<s>
The	O
patent	O
owners	O
wrote	O
that	O
they	O
allow	O
the	O
free	O
usage	O
of	O
SBC	B-General_Concept
in	O
Bluetooth	O
applications	O
with	O
a	O
goal	O
of	O
boosting	O
the	O
use	O
of	O
this	O
technology	O
.	O
</s>
<s>
SBC	B-General_Concept
SBC	B-General_Concept
profiles	O
FastStream	O
Audio	O
CD	O
Middle	O
Quality	O
High	O
Quality	O
main	O
stream	O
back	O
stream	O
(	O
for	O
reference	O
)	O
misc	O
.	O
</s>
<s>
Kingston	O
,	O
"	O
Simultaneous	O
voice	O
and	O
audio	O
traffic	O
between	O
two	O
devices	O
on	O
a	O
wireless	O
personal-area	O
network	O
"	O
,	O
Publication	O
number	O
:	O
US9398620	O
(	O
B1	O
)	O
(	O
expired	O
)	O
–	O
Free	B-Application
implementations	I-Application
BlueZ	O
libsbc	O
PulseAudio	B-Library
,	O
PipeWire	B-Application
PipeWire	B-Application
,	O
patches	O
for	O
PulseAudio	B-Library
–	O
Proprietary	B-Application
implementations	I-Application
–	O
multiple	O
hardware	O
implementations	O
hardware	O
implementation	O
in	O
Qualcomm	O
chips	O
–	O
AudioEncoding	O
Channels	O
Mono	O
(	O
1	O
)	O
Joint	O
Stereo	O
(	O
2	O
)	O
Joint	O
Stereo	O
(	O
2	O
)	O
Joint	O
Stereo	O
(	O
2	O
)	O
Mono	O
(	O
1	O
)	O
Stereo	O
(	O
2	O
)	O
Sampling	O
rate	O
16	O
kHz32	O
kHz44.1	O
kHz48	O
kHz	O
44.1	O
kHz48	O
kHz	O
44.1	O
kHz48	O
kHz	O
16	O
kHz	O
44.1	O
kHz	O
Bit	O
rate	O
up	O
to	O
510	O
kbit/s	O
( @	O
44.1	O
kHz	O
)	O
up	O
to	O
507	O
kbit/s	O
( @	O
48	O
kHz	O
)	O
229	O
kbit/s	O
( @	O
44.1	O
kHz	O
)	O
237	O
kbit/s	O
( @	O
48	O
kHz	O
)	O
328	O
kbit/s	O
( @	O
44.1	O
kHz	O
)	O
345	O
kbit/s	O
( @	O
48	O
kHz	O
)	O
212	O
kbit/s	O
( @	O
48	O
kHz	O
)	O
72	O
kbit/s	O
( @	O
16	O
kHz	O
)	O
1411	O
kbit/s	O
( @	O
44.1	O
kHz	O
)	O
Subbands	B-Algorithm
4	O
or	O
8	O
8	O
?	O
</s>
<s>
However	O
,	O
A2DP	O
requires	O
decoders	O
to	O
support	O
higher	O
quality	O
streams	O
,	O
up	O
to	O
512	O
kbit/s	O
,	O
and	O
there	O
are	O
some	O
experimental	O
encoders	O
that	O
use	O
this	O
feature	O
:	O
for	O
example	O
,	O
SBC	B-General_Concept
XQ	O
,	O
used	O
by	O
Lineage	B-Application
OS	I-Application
and	O
PipeWire	B-Application
.	O
</s>
<s>
With	O
higher	O
bit	O
rate	O
,	O
audio	O
quality	O
is	O
comparable	O
to	O
aptX	B-Algorithm
HD	O
(	O
529	O
kbit/s	O
)	O
.	O
</s>
<s>
It	O
was	O
implemented	O
in	O
the	O
FastStream	O
codec	O
,	O
which	O
is	O
the	O
SBC	B-General_Concept
codec	O
with	O
set	O
parameters	O
and	O
the	O
voice-back	O
stream	O
added	O
.	O
</s>
<s>
The	O
A2DP	O
test	O
specification	O
(	O
V1.0	O
)	O
contains	O
a	O
reference	O
implementation	O
of	O
the	O
encoder	O
and	O
decoder	O
for	O
the	O
SBC	B-General_Concept
codec	O
.	O
</s>
