<s>
E-VSB	B-Device
or	O
Enhanced	O
VSB	O
is	O
an	O
optional	O
enhancement	O
to	O
the	O
original	O
ATSC	B-Device
Standards	I-Device
that	O
use	O
the	O
8VSB	B-Device
modulation	B-Application
system	O
used	O
for	O
transmission	O
of	O
digital	B-Application
television	I-Application
.	O
</s>
<s>
E-VSB	B-Device
was	O
approved	O
by	O
the	O
ATSC	B-Device
committee	O
in	O
2004	O
.	O
</s>
<s>
For	O
mobile	O
applications	O
,	O
ATSC	B-Device
suffers	O
significant	O
signal	O
degradation	O
caused	O
by	O
the	O
Doppler	O
effect	O
.	O
</s>
<s>
The	O
E-VSB	B-Device
standard	O
provides	O
for	O
Reed	B-Error_Name
–	I-Error_Name
Solomon	I-Error_Name
error	I-Error_Name
correction	I-Error_Name
to	O
alleviate	O
the	O
data	O
corruption	O
caused	O
by	O
these	O
issues	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
standard	O
can	O
use	O
either	O
the	O
MPEG-4	B-Application
AVC	I-Application
or	O
VC-1	B-Operating_System
video	B-Application
codecs	I-Application
.	O
</s>
<s>
As	O
these	O
codecs	O
have	O
higher	O
video	O
compression	O
than	O
the	O
original	O
MPEG-2	B-Algorithm
,	O
they	O
require	O
less	O
bandwidth	O
.	O
</s>
<s>
As	O
8VSB	B-Device
lacks	O
both	O
link	B-Protocol
adaptation	I-Protocol
and	O
hierarchical	B-Protocol
modulation	I-Protocol
of	O
DVB	B-Application
,	O
which	O
would	O
allow	O
the	O
SDTV	B-Device
part	O
of	O
an	O
HDTV	B-Device
signal	O
(	O
or	O
the	O
LDTV	O
part	O
of	O
SDTV	B-Device
)	O
to	O
be	O
received	O
even	O
in	O
fringe	O
reception	O
areas	O
where	O
signal	O
strength	O
is	O
low	O
,	O
E-VSB	B-Device
yields	O
a	O
similar	O
benefit	O
.	O
</s>
<s>
However	O
,	O
E-VSB	B-Device
places	O
a	O
significant	O
processing	O
overhead	O
on	O
the	O
receiver	O
,	O
as	O
well	O
as	O
a	O
significant	O
transmission	O
overhead	O
on	O
the	O
broadcaster	O
's	O
total	O
bitrate	O
.	O
</s>
<s>
These	O
are	O
not	O
a	O
problem	O
with	O
DVB-H	B-Protocol
.	O
</s>
<s>
A-VSB	B-Device
is	O
a	O
different	O
and	O
,	O
,	O
unapproved	O
addition	O
to	O
ATSC	B-Device
,	O
which	O
is	O
also	O
designed	O
to	O
send	O
programming	O
to	O
mobile	O
devices	O
,	O
and	O
to	O
allow	O
for	O
single-frequency	B-Device
networks	I-Device
.	O
</s>
<s>
It	O
is	O
one	O
of	O
several	O
proposals	O
for	O
ATSC-M/H	B-Device
,	O
the	O
as-yet	O
undecided	O
standard	O
for	O
mobile	O
broadcasting	O
via	O
ATSC	B-Device
.	O
</s>
