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2-1.
Sending
Signals
9
2.
IMPORTANT
OVERVIEW
Digital
broadcasting
is
a
new
way
of
sending
programs
over
the
airwaves
with
superior
quality
video
and
audio.
The
DIRECTV
HD
Receiver
enables
you
to
take
full
advantage
of
digital
broadcasting.
To
fully
enjoy
it,
it
is
helpful
to
understand
the
ways
that
program
signals
are
sent.
There
are
two
types
of
TV
signal
formats;
analog
(often
called
NTSC
format;
National
Television
System
Committee)
and
digital
(ATSC
format;
Advanced
Television
System
Committee).
Digital
formats
are
classified
into
three
categories:
High-Definition
(HD),
Enhanced
Definition
(ED),
and
Standard
Definition
(SD)
according
to
the
resolution
or
digital
picture
quality.
There
are
also
three
ways
that
program
signals
can
be
received;
over-the-air
(NTSC,
ATSC),
cable
and
satellite.
TV
HD
Receiver
Phone
Jack
Digital
signal
Analog
signal
DIRECTV
Sat
A
101
Sat
C
110 Sat
B
119
Satellite
Analog
Cable
service
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