Patent ID: 8254499

Claim:
A satellite broadcasting receiving tuner, comprising: a QPSK demodulation IC for demodulating a baseband signal into a digital signal; and an automatic search unit configured to carry out an automatic search when a satellite broadcasting receiving device is initially set up, in the automatic search a receivable channel is searched for each satellite, the automatic search unit including: a frequency acquisition range setting unit configured to set, for the QPSK demodulation IC, frequency acquisition ranges respectively to wider frequency acquisition ranges than a frequency acquisition range which is generally used, while a frequency of a tuning PLL is fixed; a signal search start frequency setting unit configured to set, within the wider frequency acquisition ranges, a signal search start frequency at which the QPSK demodulation IC starts a signal search; and a signal search unit configured to carry out the signal search while the signal search start frequency is shifted by a certain frequency step, wherein the automatic search unit shifts the frequency of the tuning PLL for the respective frequency acquisition ranges, set by the frequency acquisition range setting unit, of the QPSK demodulation IC so as to carry out the signal search throughout a reception frequency range.