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Chapter 1
1.3.3 What the Satellite Receiver Does
The Receiver can be tuned to a specified satellite channel frequency and
polarization. The input is down-converted via a Low-Noise Block (LNB) to provide an
L-band input to the Receiver. The front-end tuning is microprocessor controlled with
a frequency synthesized local oscillator. A software tuning and acquisition algorithm
resolves translation errors (mainly due to the LNB).
The signal is then passed to a demodulator that recovers the signal using soft-
decision decoding. The resulting stream is Reed-Solomon decoded and
descrambled to provide inputs to the Decoder circuit. The received channel may
contain multiple Services, therefore the Receiver’s demultiplexer is configured to
select a single video Service and other audio/data components and present them at
the output.
Figure 1.2 What the Satellite Receiver Does
EN/LZT 790 0005 R1A
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