<s>
Packet	B-Protocol
loss	I-Protocol
concealment	I-Protocol
(	O
PLC	O
)	O
is	O
a	O
technique	O
to	O
mask	O
the	O
effects	O
of	O
packet	B-Protocol
loss	I-Protocol
in	O
voice	B-Application
over	I-Application
IP	I-Application
(	O
VoIP	B-Application
)	O
communications	O
.	O
</s>
<s>
When	O
the	O
voice	O
signal	O
is	O
sent	O
as	O
VoIP	B-Application
packets	O
on	O
an	O
IP	O
network	B-Architecture
,	O
the	O
packets	O
may	O
(	O
and	O
likely	O
will	O
)	O
travel	O
different	O
routes	O
.	O
</s>
<s>
Other	O
cases	O
include	O
network	B-Architecture
congestion	O
resulting	O
in	O
significant	O
delay	O
.	O
</s>
<s>
In	O
a	O
VoIP	B-Application
connection	O
,	O
error-control	O
techniques	O
such	O
as	O
automatic	B-Error_Name
repeat	I-Error_Name
request	I-Error_Name
(	O
ARQ	O
)	O
are	O
not	O
feasible	O
and	O
the	O
receiver	O
should	O
be	O
able	O
to	O
cope	O
with	O
packet	B-Protocol
loss	I-Protocol
.	O
</s>
<s>
Packet	B-Protocol
loss	I-Protocol
concealment	I-Protocol
is	O
the	O
inclusion	O
in	O
a	O
design	O
of	O
methodologies	O
for	O
accounting	O
for	O
and	O
compensating	O
for	O
the	O
loss	O
of	O
voice	O
packets	O
.	O
</s>
<s>
An	O
example	O
of	O
such	O
an	O
algorithm	O
is	O
proposed	O
in	O
International	O
Telecommunication	O
Union	O
(	O
ITU	O
)	O
recommendation	O
G.711	B-Algorithm
Appendix	O
I	O
.	O
</s>
<s>
PLC	O
is	O
used	O
with	O
the	O
codecs	O
Internet	B-Algorithm
Low	I-Algorithm
Bitrate	I-Algorithm
Codec	I-Algorithm
(	O
iLBC	B-Algorithm
)	O
and	O
SILK	O
in	O
Skype	B-Application
,	O
in	O
Jitsi	B-Protocol
with	O
the	O
SILK	O
and	O
Opus	B-Algorithm
codecs	I-Algorithm
,	O
and	O
in	O
the	O
pjsip	O
stack	O
used	O
by	O
CSipSimple	B-Application
.	O
</s>
<s>
Google	B-Application
Duo	I-Application
uses	O
WaveNetEQ	O
,	O
a	O
generative	O
model	O
based	O
on	O
DeepMind/Google	O
AI	O
’s	O
WaveRNN	O
.	O
</s>
