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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 qual-
ity video and audio. The DIRECTV
®
High-Definition Receiver enables you to take full advan-
tage of digital broadcasting. To fully enjoy it, you need to understand the ways the 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 B 110 Sat C 119
Satellite
Analog Cable service