The DSR-4800 Series
DSR-4800 Operating Manual
2
C H A P T E R 2
THE DSR-4800 SERIES
The General Instrument DSR-4800 series of digital satellite receivers
includes the DSR-4800, DSR-4810 and the DSR-4850. The aforementioned
products are hereinafter referred to as “unit.”
DSR integrated receiver/decoders are designed for broadcasters and other
professional, contribution-quality commercial satellite operations. They can
be very simple to use as they allow the program provider to perform many of
the complex setup tasks. The receivers can receive instructions from the
satellite as part of the downloaded digital signal, or you can configure it to
your exact needs using the extensive front panel menus.
All units contain the following key features:
,
The microprocessors and memory built into each unit decodes and
decompresses the MPEG-2 video, audio, data and other information in
the signal. This significantly decreases the amount of information to be
transmitted thereby reducing bandwidth requirements. Broadcasters and
programmers can transmit on one carrier any number of channels,
limited only by the material transmitted and their particular network
needs.
,
Delivery of the best possible video and audio quality by using forward
error correction (FEC) techniques that make allowances for poor signal
quality. FEC determines which information is corrupted, then corrects it.
As a result, the digital signal remains clear until the signal quality
degrades to a level where FEC can no longer restore the information.
This threshold is below an analog receivers’ ability to provide
recognizable video.
,
Based on MPEG-2 standards, we use virtual channel mapping to select
the desired video, audio and other data streams out of the overall
transmission.
,
Virtual channel information can be determined over the satellite at any
time, allowing for dynamic changes in the network without requiring you
to reconfigure the receiver.
,
Automatically handles fixed, limited-statistical and full-statistical
multiplexing to provide the best video performance.
,
For audio compression, we use the Dolby
®
Digital compression
techniques chosen by the North American Grand Alliance for High
Definition Television and for the newest digital videodisk systems. The
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