<s>
Perceptual	B-Algorithm
Audio	I-Algorithm
Coder	I-Algorithm
(	O
PAC	O
)	O
is	O
a	O
lossy	O
audio	O
compression	O
algorithm	O
.	O
</s>
<s>
Later	O
,	O
it	O
was	O
considerably	O
improved	O
and	O
renamed	O
to	O
ePAC	O
(	O
enhanced	O
Perceptual	B-Algorithm
Audio	I-Algorithm
Coder	I-Algorithm
)	O
by	O
Lucent	O
,	O
available	O
in	O
the	O
AudioVeda	O
music	O
library	O
manager	O
.	O
</s>
<s>
iBiquity	O
initially	O
tested	O
PAC	O
for	O
the	O
HD-Radio	O
IBOC	O
digital	O
radio	O
upgrade	O
for	O
FM	B-Application
and	O
AM	B-Device
,	O
but	O
chose	O
an	O
MPEG4-derived	O
codec	O
,	O
HE-AAC	O
,	O
instead	O
.	O
</s>
