<s>
Half	B-Algorithm
Rate	I-Algorithm
(	O
HR	O
or	O
GSM-HR	B-Algorithm
or	O
GSM	B-Algorithm
06.20	I-Algorithm
)	O
is	O
a	O
speech	B-Application
coding	I-Application
system	O
for	O
GSM	O
,	O
developed	O
in	O
the	O
early	O
1990s	O
.	O
</s>
<s>
Since	O
the	O
codec	B-General_Concept
,	O
operating	O
at	O
5.6	O
kbit/s	O
,	O
requires	O
half	O
the	O
bandwidth	O
of	O
the	O
Full	B-Algorithm
Rate	I-Algorithm
codec	B-General_Concept
,	O
network	O
capacity	O
for	O
voice	O
traffic	O
is	O
doubled	O
,	O
at	O
the	O
expense	O
of	O
audio	O
quality	O
.	O
</s>
<s>
GSM	O
Half	B-Algorithm
Rate	I-Algorithm
is	O
specified	O
in	O
ETSI	O
EN	O
300	O
969	O
(	O
GSM	B-Algorithm
06.20	I-Algorithm
)	O
,	O
and	O
uses	O
a	O
form	O
of	O
the	O
VSELP	O
algorithm	O
.	O
</s>
<s>
For	O
some	O
Nokia	O
phones	O
one	O
can	O
configure	O
the	O
use	O
of	O
this	O
codec	B-General_Concept
:	O
</s>
