Digital satellite broadcasting receiving tuner and satellite broadcasting receiving device including the same
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United States of America Patent
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Aug 28, 2012
Grant Date -
Apr 30, 2009
app pub date -
Oct 23, 2008
filing date -
Oct 25, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
When a satellite broadcasting receiving device 5 is initially set up, a receivable channel is searched for each satellite. In this search, a wider frequency acquisition range than a frequency acquisition range which is generally used is set for a QPSK demodulation IC 15, while the frequency of a PLL 9 is fixed. Then, in the wider frequency acquisition range, an offset is shifted by a frequency step Fstep′ by using a function for setting a frequency offset, the function being included in the QPSK demodulation IC 15. Thus, a signal search is carried out throughout a reception frequency range.
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