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Introduction
Page 1-8 Reference Guide: TT128x High Definition Professional Receiver/Decoder
ST.RE.E10141.5
1.3.3 What the Satellite Receiver Does
The Receiver can be tuned to a specified satellite channel frequency and
polarisation. 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 synthesised 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 1.3: What the Satellite Receiver Does
TT1280/TT1282 Satellite Receiver
f
n
f
n+1
f
n+2
f
n+3
f
n+4
horizontal
polarisation
vertical
polarisation
SHF
Low-Noise Block
L-band
Tune to a
satellite
channel
Select a
Service from
the satellite
channel
Multi
p
le satellite channels
Multi
p
le Services on the tuned satellite channel
Select the
components from
the chosen Service
Video
Audio
Data
Trans
p
ort Stream
Multi
p
le com
p
onents on the selected Service