<s>
PDC	O
uses	O
25kHz	O
carrier	O
,	O
pi/4	O
-DQPSK	O
modulation	O
with	O
3-timeslot	O
11.2kbit/s	O
(	O
full-rate	O
)	O
or	O
6-timeslot	O
5.6kbit/s	O
(	O
half-rate	O
)	O
voice	B-Application
codecs	I-Application
.	O
</s>
<s>
Voice	B-Application
codecs	I-Application
are	O
PDC-EFR	B-Algorithm
and	O
PDC-HR	B-Algorithm
.	O
</s>
<s>
PDC	O
Enhanced	O
Full	O
Rate	O
is	O
a	O
speech	B-Application
coding	I-Application
standard	O
that	O
was	O
developed	O
by	O
ARIB	O
in	O
Japan	O
and	O
used	O
in	O
PDC	O
mobile	O
networks	O
in	O
Japan	O
.	O
</s>
<s>
The	O
carriers	O
use	O
one	O
of	O
those	O
codecs	B-General_Concept
as	O
PDC-EFR	B-Algorithm
:	O
CS-ACELP	B-Algorithm
8	O
kbit/s	O
(	O
a.k.a.	O
</s>
<s>
NTT	O
DoCoMo	O
Hypertalk	O
)	O
and	O
ACELP	B-Algorithm
6.7	O
kbit/s	O
(	O
a.k.a.	O
</s>
<s>
The	O
PDC-EFR	B-Algorithm
CS-ACELP	B-Algorithm
uses	O
G.729	B-Algorithm
.	O
</s>
<s>
The	O
PDC-EFR	B-Algorithm
ACELP	B-Algorithm
is	O
compatible	O
with	O
the	O
AMR	B-Algorithm
mode	O
AMR_6.70	O
.	O
</s>
<s>
PDC	O
Half	O
Rate	O
is	O
a	O
speech	B-Application
coding	I-Application
standard	O
that	O
was	O
developed	O
by	O
ARIB	O
in	O
Japan	O
and	O
used	O
in	O
PDC	O
mobile	O
networks	O
in	O
Japan	O
.	O
</s>
<s>
It	O
operates	O
with	O
a	O
bit-rate	O
of	O
3.45	O
kbit/s	O
and	O
is	O
based	O
on	O
Pitch	O
Synchronous	O
Innovation	O
CELP	B-Algorithm
(	O
PSI-CELP	O
)	O
.	O
</s>
